WO2024087861A1

WO2024087861A1 - Low-power-consumption wake-up circuit, receiver, wake-up sequence sending method, and electronic device

Info

Publication number: WO2024087861A1
Application number: PCT/CN2023/115245
Authority: WO
Inventors: 黄清华; 刘抒民; 孙晓宇; 龚卫林; 刘京松; 左成杰
Original assignee: 荣耀终端有限公司; 中国科学技术大学
Priority date: 2022-10-26
Filing date: 2023-08-28
Publication date: 2024-05-02
Also published as: CN117978189A; WO2024087861A9

Abstract

The present application relates to the technical field of communications, and provides a low-power-consumption wake-up circuit, a receiver, a wake-up sequence sending method, and an electronic device. The low-power-consumption wake-up circuit comprises: at least one narrow-band filter and at least one low-power-consumption receiving path, the at least one narrow-band filter and the at least one low-power-consumption receiving path being in one-to-one correspondence; and a first narrow-band filter separately connected to an antenna and a first low-power-consumption receiving path corresponding to the first narrow-band filter, the first narrow-band filter being any one of the at least one narrow-band filter, and the first low-power-consumption receiving path being one of at least one low-power-consumption receiving path. The low-power-consumption wake-up circuit has the characteristics of anti-interference, low latency and low power consumption.

Description

Low-power wake-up circuit, receiver, wake-up sequence sending method and electronic device

This application claims priority to the Chinese patent application filed with the State Intellectual Property Office on October 26, 2022, with application number 202211328746.6 and application name “Low-power wake-up circuit, receiver, wake-up sequence sending method and electronic device”, the entire contents of which are incorporated by reference in this application.

Technical Field

The present application relates to the field of communication technology, and in particular to a low-power wake-up circuit, a receiver, a wake-up sequence sending method and an electronic device.

Background technique

With the development of terminal technology, wearable devices such as Bluetooth headsets and smart watches are increasingly widely used in people's production and life. Wearable devices often need to establish a network connection with mobile phones to use. Take Bluetooth headsets as an example. Bluetooth headsets play audio files on mobile phones by establishing a Bluetooth connection with mobile phones. Usually, Bluetooth headsets can be in standby mode when not in use. In standby mode, Bluetooth headsets can still monitor the broadcast signals of mobile phones. When the Bluetooth headset monitors the broadcast signals sent by the paired mobile phone, it can switch to the working state and establish a network connection with the mobile phone for use.

On the other hand, due to size limitations, wearable devices often use small batteries such as button batteries. This type of small battery has a small capacity, so excessive standby power consumption of wearable devices will shorten the standby time and affect the user experience. In order to reduce standby power consumption, the traditional way is to set a wake-up circuit with lower power consumption to monitor the broadcast signal of the mobile phone, and set the main chip (such as the Bluetooth chip) to sleep. When the wake-up circuit monitors the broadcast signal sent by the paired mobile phone, it can wake up the main chip to establish a network connection.

However, the frequency of the broadcast signal received by the wake-up circuit usually reuses the existing communication frequency and is therefore susceptible to interference, causing the receiver to be unable to normally receive and identify the broadcast signal carrying the wake-up sequence, affecting the communication quality between devices.

Summary of the invention

The present application provides a low-power wake-up circuit, a receiver, a wake-up sequence sending method, an apparatus, an electronic device, a computer-readable storage medium and a computer program product, which have strong anti-interference capabilities and ensure the communication quality between devices.

In a first aspect, a low-power wake-up circuit is provided, which is applied to a receiver. The low-power wake-up circuit includes: at least one narrowband filter and at least one low-power receiving path, and the at least one narrowband filter and the at least one low-power receiving path correspond to each other one by one; the first narrowband filter is respectively connected to the antenna and the first low-power receiving path corresponding to the first narrowband filter, the first narrowband filter is any one of the at least one narrowband filters, and the first low-power receiving path is one of the low-power receiving paths.

The passband bandwidth of the narrowband filter is very narrow, so the interference signals that can pass through the narrowband filter are greatly reduced. The narrowband filter can filter out most of the interference signals, improve the anti-interference ability of the low-power wake-up circuit, and improve the wake-up success rate of the main chip and the main receiving path, thereby improving the communication quality. Compared with the low duty cycle solution, the delay is lower, and the timeliness of outputting the wake-up signal is higher while ensuring low standby power consumption, avoiding the situation of untimely wake-up and improving the user experience.

It should be noted that the main receiving path can be a separate receiving path or a device compatible with the transmitting path. There is no limitation on the designed path, as long as it is a path that can realize the receiving function.

In some possible implementations, at least one low-power receiving path is used to output a wake-up signal when a wake-up sequence carried by a signal received by an antenna matches a preset sequence.

The wake-up signal can be used to wake up the main chip of the communication module where the receiver is located, such as a Bluetooth chip, a WIFI chip, etc. It can also wake up active devices on the main receiving path, such as RF low noise amplifiers, VCOs, and other devices. In some implementations, after the wake-up signal wakes up the main chip, the main chip controls the active devices on the main receiving path to switch from sleep mode to normal working state.

Since the standby power consumption of the low-power wake-up circuit is low, the low-power wake-up circuit can be in a receiving state all the time. At this time, the main chip can be in a dormant state, so the standby power consumption of the device can be reduced. The low-power wake-up circuit monitors the broadcast signal all the time. When the wake-up sequence matches, it can output a wake-up signal to the main chip to wake up the main chip and the main receiving path from the dormant state to the working state. The above-mentioned low-power wake-up circuit includes a narrowband filter and a low-power receiving path. Since the passband of the narrowband filter is narrow, it can effectively filter out interference signals with frequencies outside the passband, thereby improving the anti-interference ability of the low-power wake-up circuit and improving the accuracy of waking up the main chip and the main receiving path. Compared with the low duty cycle solution, the delay is lower, and the timeliness of outputting the wake-up signal is higher while ensuring low standby power consumption, which avoids the situation of untimely wake-up and improves the user experience.

In some possible implementations, the first narrowband filter includes: a high-order harmonic bulk acoustic wave resonator and a bandpass filter;

The high-order harmonic bulk acoustic wave resonator is connected to the antenna and the bandpass filter respectively, and the bandpass filter is connected to the first low-power receiving path; or, the bandpass filter is connected to the antenna and the high-order harmonic bulk acoustic wave resonator respectively, and the high-order harmonic bulk acoustic wave resonator is connected to the first low-power receiving path.

The first narrowband filter includes a combination of a bandpass filter and a high-order harmonic bulk acoustic wave resonator, which is an ultra-narrowband filter. A high-order harmonic bulk acoustic wave resonator is a resonator whose frequency response curve has multiple repeated narrow peaks. By setting a bandpass filter, one or more of the multiple repeated narrow peaks of the high-order harmonic bulk acoustic wave resonator can be selected, that is, one or more resonant frequency waves can be selected. When the bandpass filter and the high-order harmonic bulk acoustic wave resonator are connected in series, the center frequency of the passband of the bandpass filter is close to one of the resonant frequencies of the high-order harmonic bulk acoustic wave resonator, that is, one of the resonant frequencies of the high-order harmonic bulk acoustic wave resonator falls within the passband of the bandpass filter, so that the signal of this resonant frequency can be selected, and the signals of other resonant frequencies can be suppressed, thereby realizing the function of ultra-narrowband filtering.

In some possible implementations, the interval between any two adjacent resonant frequencies of the high-harmonic bulk acoustic wave resonator ranges from 10 MHz to 100 MHz, the bandwidth of the resonant frequency of the high-harmonic bulk acoustic wave resonator ranges from 50 KHz to 1000 KHz, and the difference between the passband bandwidth of the bandpass filter and the interval between any two adjacent resonant frequencies of the high-harmonic bulk acoustic wave resonator is less than a preset difference.

The difference between the passband bandwidth of the bandpass filter and the interval between any two adjacent resonant frequencies of the high-order harmonic bulk acoustic wave resonator is less than the preset difference, indicating that the difference between the two is small. In this way, the bandpass filter can select a signal of a resonant frequency of the high-order harmonic bulk acoustic wave resonator, thereby filtering out most of the interference signals, realizing ultra-narrowband filtering, and improving the anti-interference ability of the low-power wake-up circuit.

In some possible implementations, the first low-power receiving path includes: a mixer, an intermediate frequency filter, an analog-to-digital conversion circuit, and a correlator; the mixer is used to perform self-mixing on the wake-up signal filtered by the first narrowband filter, and transmit the signal generated by the self-mixing to the intermediate frequency filter; the intermediate frequency filter is used to filter the signal output by the mixer, and transmit the intermediate frequency analog signal obtained by filtering to the analog-to-digital conversion circuit; the analog-to-digital conversion circuit is used to The intermediate frequency analog signal is converted into a digital signal, and the digital signal is transmitted to a correlator; the correlator is used to compare the wake-up sequence carried by the digital signal with a preset sequence, and output a first matching result.

After the broadcast signal passes through the narrowband filter, it can be divided into two paths and enter the local oscillator port and the radio frequency port of the mixer for self-mixing. The broadcast signal after self-mixing is output from the intermediate frequency port of the mixer and filtered out multiple harmonics through the intermediate frequency filter 2 to obtain an intermediate frequency analog signal. The intermediate frequency analog signal enters the analog-to-digital converter for analog-to-digital conversion to obtain a digital signal. The digital signal enters the correlator for decoding to obtain a wake-up sequence. The correlator compares the decoded wake-up sequence with the preset sequence stored in the correlator and outputs the first matching result. If the wake-up sequence matches the preset sequence, the wake-up signal can be output as the first matching result, and the wake-up signal can be a high level; if the wake-up sequence does not match the preset sequence, the wake-up signal may not be output, or a low level may be output as the first matching result, thereby achieving accurate decoding of the wake-up sequence.

In some possible implementations, the first low-power receiving path also includes: a low-noise amplifier, the analog-to-digital conversion circuit is a comparator; a low-noise amplifier, used to amplify the intermediate frequency analog signal; and a comparator, used to convert the filtered and amplified intermediate frequency analog signal into a digital signal.

By adding a low noise amplifier, the intermediate frequency signal can be amplified while ensuring a high signal-to-noise ratio, thereby ensuring the accuracy of the resolved wake-up sequence and improving the wake-up success rate.

In some possible implementations, the number of at least one low-power receiving path is multiple, and the circuit further includes: a voting circuit; a voting circuit, configured to output a wake-up signal based on a first matching result output by a correlator of the multiple low-power receiving paths.

In some possible implementations, the voting circuit is an OR gate.

When there are multiple low-power receiving paths, and the voting circuit is an OR gate, as long as one low-power receiving path outputs a high level, the voting circuit can output a high level as a wake-up signal. It will not fail to accurately output the wake-up signal due to the interference signal having the same or similar frequency as a broadcast signal. This can avoid interference signals, thereby improving the anti-interference ability and the success rate of wake-up.

In some possible implementations, the voting circuit is an AND gate.

When there are multiple low-power receiving paths, the voting circuit is an AND gate that can output a high level as a wake-up signal only when multiple low-power receiving paths output a high level. This can avoid false wake-up caused by interference signals and improve the accuracy of the output wake-up signal.

In some possible implementations, the number of the at least one narrowband filter is plural, and the passband frequency of each narrowband filter is different.

Since the passband frequency of each narrowband filter is different, broadcast signals of different frequencies can be selected. In the presence of interference signals, the frequency of the interference signals can be avoided and the broadcast signals can be transmitted using a frequency band without interference, thereby improving the anti-interference ability.

In some possible implementations, the number of the at least one narrowband filter is two or three.

If there are too many narrowband filters, the number of corresponding low-power receiving paths will also increase, which will lead to an increase in the number of devices, an increase in the volume occupied, and an increase in cost. If there are too few narrowband filters, the number of corresponding low-power receiving paths will also be smaller, so that fewer frequencies can pass, which may lead to a decrease in anti-interference ability. In this implementation, two or three narrowband filters are used, and two or three low-power receiving paths are used accordingly, which can effectively avoid the frequency band of the interference signal, and can also reasonably control the number and volume of circuit components, and effectively control costs, so it is more reasonable.

In a second aspect, a receiver is provided, the receiver comprising a main receiving path and any low-power wake-up circuit as described in the first aspect.

In some possible implementations, the receiver also includes: a switch; the switch is connected to the low-power wake-up circuit, the main receiving path and the antenna respectively; the switch is used to connect the antenna and the main receiving path when the low-power wake-up circuit outputs a wake-up signal.

Using a switch to select the main receiving path and the low-power wake-up circuit can realize antenna multiplexing without changing the structure of the existing communication system, saving the number of antennas, reducing the cost and difficulty of antenna design.

In some possible implementations, the switch is a single-pole double-throw switch, and a common end of the single-pole double-throw switch is connected to the antenna.

In a third aspect, a wake-up sequence sending method is provided, which is applied to a first electronic device, wherein the first electronic device is used to send a wake-up sequence to a second electronic device, wherein the wake-up sequence is used to characterize the identity of the first electronic device, and the second electronic device includes a low-power wake-up circuit, and the low-power wake-up circuit includes at least one narrowband filter; the method includes: the first electronic device receives a connection instruction, and the connection instruction is used to instruct the first electronic device and the second electronic device to establish a network connection; in response to the connection instruction, the first electronic device sends the wake-up sequence to the second electronic device according to multiple frequencies in a preset frequency set respectively; wherein the multiple frequencies are frequencies within a first frequency range, the preset frequency set includes a first frequency and a second frequency, the first frequency and the second frequency differ by a preset bandwidth, the first frequency is any one of the multiple frequencies, the second frequency is different from the first frequency, and the first frequency range is the drift range of the center frequency of the passband of at least one narrowband filter within a preset temperature range.

The first electronic device can be a device that sends broadcast signals, such as a mobile phone, and the second electronic device can be a device such as a Bluetooth headset in standby mode. When the user needs to connect the mobile phone as the first electronic device and the Bluetooth headset as the second electronic device, a connection instruction can be input to the first electronic device, such as clicking the logo of the Bluetooth headset in the first electronic device. The mobile phone receives the connection instruction triggered by the user's click operation, and can repeatedly transmit the broadcast signal carrying the wake-up sequence according to the adjustable frequency point that can cover the temperature drift range of the narrowband filter. For example, the above-mentioned multiple frequencies are frequencies in a preset frequency set, and the multiple frequencies in the preset frequency set can cover a first frequency range, and the first frequency range is the drift range of the center frequency of the passband of the narrowband filter within a preset temperature range, that is, the temperature drift range of the narrowband filter. Any two adjacent frequencies in the above-mentioned preset frequency set differ by a preset bandwidth.

Optionally, when the low-power wake-up circuit includes a narrowband filter, the first frequency range may be a drift range of the center frequency of the passband of the narrowband filter within a preset temperature range; when the low-power wake-up circuit includes multiple narrowband filters, the first frequency range may be the sum of the drift ranges of the passband frequencies of the multiple narrowband filters within a preset temperature range.

In this implementation, even if the narrowband filter in the low-power wake-up circuit in the second electronic device has temperature drift, after rounds of transmission, the transmitter will always send a broadcast signal that falls within the passband of the narrowband filter, thereby outputting a wake-up signal. This method can avoid the situation where the receiver cannot be accurately woken up due to the inability to pass the broadcast signal caused by the temperature drift of the narrowband filter, and improves the applicable temperature range of the low-power wake-up circuit, and has a wider range of usage scenarios.

In some possible implementations, the preset bandwidth ranges from 50 KHz to 1000 KHz.

In some possible implementations, the preset bandwidth is 120 KHz, and the number of the multiple frequencies in the preset frequency set is 45.

For 2.4G WIFI signals, the preset bandwidth of 120KHz interval can realize the transmission of narrowband signals. Most interference signals can be avoided. At the same time, the number of multiple frequencies in the preset frequency set is 45, that is, 45 broadcast signals with a frequency interval of 120KHz are sent in rotation, which can cover the frequency deviation in the temperature range of -20 degrees to 60 degrees. The temperature range is fully covered, avoiding the situation where the receiver cannot be woken up in time due to incomplete coverage of the temperature range, and the application scenarios are wider.

In a fourth aspect, an electronic device is provided, comprising any low-power wake-up circuit in the technical solution described in the first aspect.

In a fifth aspect, an electronic device is provided, comprising any receiver in the technical solution described in the second aspect.

In a sixth aspect, a device for sending any wake-up sequence is provided, comprising a unit composed of software and/or hardware, and the unit is used to execute any method in the technical solution described in the third aspect.

In a seventh aspect, an electronic device is provided, comprising: a processor, a memory, and an interface;

The processor, memory and interface cooperate with each other so that the electronic device executes any one of the methods in the technical solution described in the third aspect.

In an eighth aspect, a chip is provided, comprising a processor; the processor is used to read and execute a computer program stored in a memory to execute any one of the methods in the technical solution described in the third aspect.

Optionally, the chip also includes a memory, and the memory is connected to the processor via a circuit or wire.

Further optionally, the chip also includes a communication interface.

In the ninth aspect, a computer-readable storage medium is provided, in which a computer program is stored. When the computer program is executed by a processor, the processor executes any one of the methods in the technical solution described in the third aspect.

In a tenth aspect, a computer program product is provided, the computer program product comprising: a computer program code, when the computer program code is run on an electronic device, the electronic device executes any one of the methods in the technical solution described in the third aspect.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the structure of a terminal device 100 provided in an embodiment of the present application;

FIG2 is a software structure block diagram of the terminal device 100 provided in an embodiment of the present application;

FIG3 is a schematic diagram of an application scenario of a common wake-up device provided in an embodiment of the present application;

FIG4 is a schematic diagram of the structure of a conventional receiver provided in an embodiment of the present application;

FIG5 is a timing diagram of a receiving and transmitting signal of a low duty cycle solution provided in an embodiment of the present application;

FIG6 is a diagram showing an application scenario of a common low-power wake-up circuit provided in an embodiment of the present application;

FIG7 is a comparison diagram of power consumption curves of different receiver solutions provided in an embodiment of the present application;

FIG8 is a diagram of an application scenario of a low-power wake-up circuit provided in an embodiment of the present application;

FIG9 is an interactive diagram of an example of generating a wake-up signal provided in an embodiment of the present application;

FIG10 is a schematic diagram of a circuit structure of a low-power wake-up circuit provided in an embodiment of the present application;

FIG11 is a schematic diagram of the structure and frequency response curve of a narrowband filter provided in an embodiment of the present application;

FIG12 is a schematic diagram of a circuit structure of another example of a low-power wake-up circuit provided in an embodiment of the present application;

FIG13 is a schematic diagram of a circuit structure of another example of a low-power wake-up circuit provided in an embodiment of the present application;

FIG14 is a schematic diagram of a circuit structure of another example of a low-power wake-up circuit provided in an embodiment of the present application;

FIG15 is a circuit diagram showing the circuit structure shown in FIG14 divided according to basic functions;

FIG16 is a schematic diagram of a circuit structure of a low-power wake-up circuit provided in an embodiment of the present application and applied in a receiver;

FIG17 is a flow chart of a method for sending a wake-up sequence according to an embodiment of the present application;

FIG. 18 is a schematic diagram of the structure of a wake-up sequence sending device provided in an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. In the description of the embodiments of the present application, unless otherwise specified, "/" means or, for example, A/B can mean A or B; "and/or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and/or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, "multiple" means two or more than two.

In the following, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", and "third" may explicitly or implicitly include one or more of the features.

The low-power wake-up circuit and receiver provided in the embodiments of the present application can be applied to wearable devices such as Bluetooth headsets, smart watches, smart bracelets, smart glasses, etc., and can also be applied to mobile phones, tablet computers, wearable devices, vehicle-mounted devices, augmented reality (AR)/virtual reality (VR) devices, laptops, ultra-mobile personal computers (UMPC), netbooks, personal digital assistants (PDA) and other terminal devices. The embodiments of the present application do not impose any restrictions on the specific types of terminal devices.

Exemplarily, FIG1 is a schematic diagram of the structure of an example of a terminal device 100 provided in an embodiment of the present application. The terminal device 100 may include a processor 110, an external memory interface 120, an internal memory 121, a universal serial bus (USB) interface 130, a charging management module 140, a power management module 141, a battery 142, an antenna 1, an antenna 2, a mobile communication module 150, a wireless communication module 160, an audio module 170, a speaker 170A, a receiver 170B, a microphone 170C, an earphone interface 170D, a sensor module 180, a button 190, a motor 191, an indicator 192, a camera 193, a display screen 194, and a subscriber identification module (SIM) card interface 195, etc. The sensor module 180 may include a pressure sensor 180A, a gyroscope sensor 180B, an air pressure sensor 180C, a magnetic sensor 180D, an acceleration sensor 180E, a distance sensor 180F, a proximity light sensor 180G, a fingerprint sensor 180H, a temperature sensor 180J, a touch sensor 180K, an ambient light sensor 180L, a bone conduction sensor 180M, etc.

It is understood that the structure illustrated in the embodiment of the present application does not constitute a specific limitation on the terminal device 100. In other embodiments of the present application, the terminal device 100 may include more or fewer components than shown in the figure, or combine some components, or split some components, or arrange the components differently. The components shown in the figure may be implemented in hardware, software, or a combination of software and hardware.

The processor 110 may include one or more processing units, for example, the processor 110 may include an application processor (AP), a modem processor, a graphics processor (GPU), an image signal processor (ISP), a controller, a memory, a video codec, a digital signal processor (DSP), a baseband processor, and/or a neural-network processing unit (NPU), etc. Different processing units may be independent devices or integrated into one or more processors.

The controller may be the nerve center and command center of the terminal device 100. The controller may generate an operation control signal according to the instruction operation code and the timing signal to complete the control of fetching and executing instructions.

The processor 110 may also be provided with a memory for storing instructions and data. In some embodiments, the memory in the processor 110 is a cache memory. The memory may store instructions or data that the processor 110 has just used or cyclically used. If the processor 110 needs to use the instruction or data again, it may be directly called from the memory. This avoids repeated access, reduces the waiting time of the processor 110, and thus improves the efficiency of the system.

In some embodiments, the processor 110 may include one or more interfaces. The interface may include an inter-integrated circuit (I2C) interface, an inter-integrated circuit sound (I2S) interface, a pulse code modulation (PCM) interface, a universal asynchronous receiver/transmitter (UART) interface, a mobile industry processor interface (MIPI), a general-purpose input/output (GPIO) interface, a subscriber identity module (SIM) interface, and/or a universal serial bus (USB) interface, etc.

The I2C interface is a bidirectional synchronous serial bus, including a serial data line (SDA) and a serial clock line (SCL). In some embodiments, the processor 110 may include multiple groups of I2C buses. The processor 110 may be coupled to the touch sensor 180K, the charger, the flash, the camera 193, etc. through different I2C bus interfaces. For example, the processor 110 may be coupled to the touch sensor 180K through the I2C interface, so that the processor 110 communicates with the touch sensor 180K through the I2C bus interface, thereby realizing the touch function of the terminal device 100.

The I2S interface can be used for audio communication. In some embodiments, the processor 110 can include multiple I2S buses. The processor 110 can be coupled to the audio module 170 via the I2S bus to achieve communication between the processor 110 and the audio module 170. In some embodiments, the audio module 170 can transmit an audio signal to the wireless communication module 160 via the I2S interface to achieve the function of answering a call through a Bluetooth headset.

The PCM interface can also be used for audio communication, sampling, quantizing and encoding analog signals. In some embodiments, the audio module 170 and the wireless communication module 160 can be coupled via a PCM bus interface. In some embodiments, the audio module 170 can also transmit audio signals to the wireless communication module 160 via the PCM interface to realize the function of answering calls via a Bluetooth headset. Both the I2S interface and the PCM interface can be used for audio communication.

The UART interface is a universal serial data bus for asynchronous communication. The bus can be a bidirectional communication bus. It converts the data to be transmitted between serial communication and parallel communication. In some embodiments, the UART interface is generally used to connect the processor 110 and the wireless communication module 160. For example, the processor 110 communicates with the Bluetooth module in the wireless communication module 160 through the UART interface to implement the Bluetooth function. In some embodiments, the audio module 170 can transmit an audio signal to the wireless communication module 160 through the UART interface to implement the function of playing music through a Bluetooth headset.

The MIPI interface can be used to connect the processor 110 with peripheral devices such as the display screen 194 and the camera 193. The MIPI interface includes a camera serial interface (CSI), a display serial interface (DSI), etc. In some embodiments, the processor 110 and the camera 193 communicate via the CSI interface to implement the shooting function of the terminal device 100. The processor 110 and the display screen 194 communicate via the DSI interface to implement the display function of the terminal device 100.

The GPIO interface can be configured by software. The GPIO interface can be configured as a control signal or as In some embodiments, the GPIO interface can be used to connect the processor 110 with the camera 193, the display screen 194, the wireless communication module 160, the audio module 170, the sensor module 180, etc. The GPIO interface can also be configured as an I2C interface, an I2S interface, a UART interface, a MIPI interface, etc.

The USB interface 130 is an interface that complies with the USB standard specification, and specifically can be a Mini USB interface, a Micro USB interface, a USB Type C interface, etc. The USB interface 130 can be used to connect a charger to charge the terminal device 100, and can also be used to transmit data between the terminal device 100 and peripheral devices. It can also be used to connect headphones to play audio through the headphones. The interface can also be used to connect other terminal devices, such as AR devices, etc.

It is understandable that the interface connection relationship between the modules illustrated in the embodiment of the present application is only a schematic illustration and does not constitute a structural limitation on the terminal device 100. In other embodiments of the present application, the terminal device 100 may also adopt different interface connection methods in the above embodiments, or a combination of multiple interface connection methods.

The charging management module 140 is used to receive charging input from a charger. The charger may be a wireless charger or a wired charger. In some wired charging embodiments, the charging management module 140 may receive charging input from a wired charger through the USB interface 130. In some wireless charging embodiments, the charging management module 140 may receive wireless charging input through a wireless charging coil of the terminal device 100. While the charging management module 140 is charging the battery 142, it may also power the terminal device through the power management module 141.

The power management module 141 is used to connect the battery 142, the charging management module 140 and the processor 110. The power management module 141 receives input from the battery 142 and/or the charging management module 140, and supplies power to the processor 110, the internal memory 121, the external memory, the display screen 194, the camera 193, and the wireless communication module 160. The power management module 141 can also be used to monitor parameters such as battery capacity, battery cycle number, battery health status (leakage, impedance), etc. In some other embodiments, the power management module 141 can also be set in the processor 110. In other embodiments, the power management module 141 and the charging management module 140 can also be set in the same device.

The wireless communication function of the terminal device 100 can be implemented through the antenna 1, the antenna 2, the mobile communication module 150, the wireless communication module 160, the modem processor and the baseband processor.

Antenna 1 and antenna 2 are used to transmit and receive electromagnetic wave signals. The structures of antenna 1 and antenna 2 in FIG. 1 are only an example. Each antenna in terminal device 100 can be used to cover a single or multiple communication frequency bands. Different antennas can also be reused to improve the utilization of antennas. For example, antenna 1 can be reused as a diversity antenna of a wireless local area network. In some other embodiments, the antenna can be used in combination with a tuning switch.

The mobile communication module 150 can provide solutions for wireless communications including 2G/3G/4G/5G applied to the terminal device 100. The mobile communication module 150 may include at least one filter, a switch, a power amplifier, a low noise amplifier (LNA), etc. The mobile communication module 150 can receive electromagnetic waves from the antenna 1, and filter, amplify, and process the received electromagnetic waves, and transmit them to the modulation and demodulation processor for demodulation. The mobile communication module 150 can also amplify the signal modulated by the modulation and demodulation processor, and convert it into electromagnetic waves for radiation through the antenna 1. In some embodiments, at least some of the functional modules of the mobile communication module 150 can be set in the processor 110. In some embodiments, at least some of the functional modules of the mobile communication module 150 can be set in the same device as at least some of the modules of the processor 110.

The modem processor may include a modulator and a demodulator. The modulator is used to modulate the low-frequency baseband signal to be transmitted into a medium-high frequency signal. The demodulator is used to demodulate the received electromagnetic wave signal into a low-frequency baseband signal. The demodulator then transmits the demodulated low-frequency baseband signal to the baseband processor for processing. After the low-frequency baseband signal is processed by the baseband processor, it is passed to the application processor. The application processor transmits the low-frequency baseband signal to the application processor through an audio device (not limited to the speaker 170A, The modem processor 110 may be configured to output a sound signal to the receiver 170B, or to display an image or video through the display screen 194. In some embodiments, the modem processor may be an independent device. In other embodiments, the modem processor may be independent of the processor 110 and may be provided in the same device as the mobile communication module 150 or other functional modules.

The wireless communication module 160 can provide wireless communication solutions including wireless local area networks (WLAN) (such as wireless fidelity (Wi-Fi) network), bluetooth (BT), global navigation satellite system (GNSS), frequency modulation (FM), near field communication (NFC), infrared (IR) and the like applied to the terminal device 100. The wireless communication module 160 can be one or more devices integrating at least one communication processing module. The wireless communication module 160 receives electromagnetic waves via the antenna 2, modulates the frequency of the electromagnetic wave signal and performs filtering, and sends the processed signal to the processor 110. The wireless communication module 160 can also receive the signal to be sent from the processor 110, modulate the frequency of the signal, amplify the signal, and convert it into electromagnetic waves for radiation through the antenna 2.

In some embodiments, the antenna 1 of the terminal device 100 is coupled to the mobile communication module 150, and the antenna 2 is coupled to the wireless communication module 160, so that the terminal device 100 can communicate with the network and other devices through wireless communication technology. The wireless communication technology may include global system for mobile communications (GSM), general packet radio service (GPRS), code division multiple access (CDMA), wideband code division multiple access (WCDMA), time-division code division multiple access (TD-SCDMA), long term evolution (LTE), BT, GNSS, WLAN, NFC, FM, and/or IR technology. The GNSS may include a global positioning system (GPS), a global navigation satellite system (GLONASS), a Beidou navigation satellite system (BDS), a quasi-zenith satellite system (QZSS) and/or a satellite based augmentation system (SBAS).

The terminal device 100 implements the display function through a GPU, a display screen 194, and an application processor. The GPU is a microprocessor for image processing, which connects the display screen 194 and the application processor. The GPU is used to perform mathematical and geometric calculations for graphics rendering. The processor 110 may include one or more GPUs that execute program instructions to generate or change display information.

The display screen 194 is used to display images, videos, etc. The display screen 194 includes a display panel. The display panel can be a liquid crystal display (LCD), an organic light-emitting diode (OLED), an active-matrix organic light-emitting diode or an active-matrix organic light-emitting diode (AMOLED), a flexible light-emitting diode (FLED), Miniled, MicroLed, Micro-oLed, quantum dot light-emitting diodes (QLED), etc. In some embodiments, the terminal device 100 may include 1 or N display screens 194, where N is a positive integer greater than 1.

The terminal device 100 can realize the shooting function through ISP, camera 193, video codec, GPU, display screen 194 and application processor.

The ISP is used to process the data fed back by the camera 193. For example, when taking a photo, the shutter is opened, and light is transmitted to the camera sensor through the lens. The light signal is converted into an electrical signal, and the camera sensor transmits the electrical signal to the ISP for processing and converts it into an image visible to the naked eye. The ISP can also perform algorithm optimization on the noise, brightness, and skin color of the image. The ISP can also optimize the exposure, color temperature and other parameters of the shooting scene. In some embodiments, the ISP can To be set in camera 193.

The camera 193 is used to capture still images or videos. The object generates an optical image through the lens and projects it onto the photosensitive element. The photosensitive element can be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS) phototransistor. The photosensitive element converts the optical signal into an electrical signal, and then passes the electrical signal to the ISP to be converted into a digital image signal. The ISP outputs the digital image signal to the DSP for processing. The DSP converts the digital image signal into an image signal in a standard RGB, YUV or other format. In some embodiments, the terminal device 100 may include 1 or N cameras 193, where N is a positive integer greater than 1.

The digital signal processor is used to process digital signals, and can process not only digital image signals but also other digital signals. For example, when the terminal device 100 is selecting a frequency point, the digital signal processor is used to perform Fourier transform on the frequency point energy.

Video codecs are used to compress or decompress digital videos. The terminal device 100 may support one or more video codecs. In this way, the terminal device 100 can play or record videos in multiple coding formats, such as moving picture experts group (MPEG) 1, MPEG2, MPEG3, MPEG4, etc.

NPU is a neural network (NN) computing processor. By drawing on the structure of biological neural networks, such as the transmission mode between neurons in the human brain, it can quickly process input information and can also continuously self-learn. Through NPU, applications such as intelligent cognition of the terminal device 100 can be realized, such as image recognition, face recognition, voice recognition, text understanding, etc.

The external memory interface 120 can be used to connect an external memory card, such as a Micro SD card, to expand the storage capacity of the terminal device 100. The external memory card communicates with the processor 110 through the external memory interface 120 to implement a data storage function. For example, files such as music and videos can be stored in the external memory card.

The internal memory 121 can be used to store computer executable program codes, which include instructions. The processor 110 executes various functional applications and data processing of the terminal device 100 by running the instructions stored in the internal memory 121. The internal memory 121 may include a program storage area and a data storage area. Among them, the program storage area may store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc. The data storage area may store data created during the use of the terminal device 100 (such as audio data, a phone book, etc.), etc. In addition, the internal memory 121 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, a universal flash storage (UFS), etc.

The terminal device 100 can implement audio functions such as music playing and recording through the audio module 170, the speaker 170A, the receiver 170B, the microphone 170C, the headphone interface 170D, and the application processor.

The audio module 170 is used to convert digital audio information into analog audio signal output, and is also used to convert analog audio input into digital audio signals. The audio module 170 can also be used to encode and decode audio signals. In some embodiments, the audio module 170 can be arranged in the processor 110, or some functional modules of the audio module 170 can be arranged in the processor 110.

The speaker 170A, also called a "speaker", is used to convert an audio electrical signal into a sound signal. The terminal device 100 can listen to music or listen to a hands-free call through the speaker 170A.

The receiver 170B, also called a "handset", is used to convert audio electrical signals into sound signals. When the terminal device 100 receives a call or voice message, the voice can be received by placing the receiver 170B close to the ear.

Microphone 170C, also called "microphone" or "microphone", is used to convert sound signals into electrical signals. When making a call or sending a voice message, the user can speak by putting their mouth close to the microphone 170C to input the sound signal into the microphone 170C. The terminal device 100 can be provided with at least one microphone 170C. In other embodiments, the terminal device 100 can be provided with two microphones 170C, which can not only collect sound signals but also realize noise reduction function. In other embodiments, the terminal device 100 can also be provided with three, four or more microphones 170C to collect sound signals, reduce noise, identify the source of sound, realize directional recording function, etc.

The earphone interface 170D is used to connect a wired earphone. The earphone interface 170D may be the USB interface 130, or may be a 3.5 mm open mobile terminal platform (OMTP) standard interface or a cellular telecommunications industry association of the USA (CTIA) standard interface.

The pressure sensor 180A is used to sense the pressure signal and can convert the pressure signal into an electrical signal. In some embodiments, the pressure sensor 180A can be set on the display screen 194. There are many types of pressure sensors 180A, such as resistive pressure sensors, inductive pressure sensors, capacitive pressure sensors, etc. The capacitive pressure sensor can be a parallel plate including at least two conductive materials. When a force acts on the pressure sensor 180A, the capacitance between the electrodes changes. The terminal device 100 determines the intensity of the pressure according to the change in capacitance. When a touch operation acts on the display screen 194, the terminal device 100 detects the touch operation intensity according to the pressure sensor 180A. The terminal device 100 can also calculate the touch position according to the detection signal of the pressure sensor 180A. In some embodiments, touch operations acting on the same touch position but with different touch operation intensities can correspond to different operation instructions. For example: when a touch operation with a touch operation intensity less than the first pressure threshold acts on the short message application icon, an instruction to view the short message is executed. When a touch operation with a touch operation intensity greater than or equal to the first pressure threshold acts on the short message application icon, an instruction to create a new short message is executed.

The gyroscope sensor 180B can be used to determine the motion posture of the terminal device 100. In some embodiments, the angular velocity of the terminal device 100 around three axes (i.e., x, y, and z axes) can be determined by the gyroscope sensor 180B. The gyroscope sensor 180B can be used for anti-shake shooting. For example, when the shutter is pressed, the gyroscope sensor 180B detects the angle of the terminal device 100 shaking, calculates the distance that the lens module needs to compensate based on the angle, and allows the lens to offset the shaking of the terminal device 100 through reverse movement to achieve anti-shake. The gyroscope sensor 180B can also be used for navigation and somatosensory game scenes.

The air pressure sensor 180C is used to measure air pressure. In some embodiments, the terminal device 100 calculates the altitude through the air pressure value measured by the air pressure sensor 180C to assist positioning and navigation.

The magnetic sensor 180D includes a Hall sensor. The terminal device 100 can use the magnetic sensor 180D to detect the opening and closing of the flip leather case. In some embodiments, when the terminal device 100 is a flip phone, the terminal device 100 can detect the opening and closing of the flip cover according to the magnetic sensor 180D. Then, according to the detected opening and closing state of the leather case or the opening and closing state of the flip cover, the flip cover automatic unlocking and other features are set.

The acceleration sensor 180E can detect the magnitude of the acceleration of the terminal device 100 in various directions (generally three axes). When the terminal device 100 is stationary, the magnitude and direction of gravity can be detected. It can also be used to identify the posture of the terminal device and applied to applications such as horizontal and vertical screen switching and pedometers.

The distance sensor 180F is used to measure the distance. The terminal device 100 can measure the distance by infrared or laser. In some embodiments, when shooting a scene, the terminal device 100 can use the distance sensor 180F to measure the distance to achieve fast focusing.

The proximity light sensor 180G may include, for example, a light emitting diode (LED) and a light detector, such as a photodiode. The light emitting diode may be an infrared light emitting diode. The terminal device 100 emits infrared light outward through the light emitting diode. The terminal device 100 uses a photodiode to detect infrared reflected light from nearby objects. When sufficient reflected light is detected, it can be determined that there is an object near the terminal device 100. When insufficient reflected light is detected, the terminal device 100 can determine that there is no object near the terminal device 100. The terminal device 100 can use the proximity light sensor 180G to detect that the user holds the terminal device 100 close to the ear to talk, so as to automatically turn off the screen to save power. The proximity light sensor 180G can also be used in leather case mode, and pocket mode automatically unlocks and locks the screen.

The ambient light sensor 180L is used to sense the ambient light brightness. The terminal device 100 can adaptively adjust the brightness of the display screen 194 according to the perceived ambient light brightness. The ambient light sensor 180L can also be used to automatically adjust the white balance when taking pictures. The ambient light sensor 180L can also cooperate with the proximity light sensor 180G to detect whether the terminal device 100 is in a pocket to prevent accidental touch.

The fingerprint sensor 180H is used to collect fingerprints. The terminal device 100 can use the collected fingerprint characteristics to achieve fingerprint unlocking, access application locks, fingerprint photography, fingerprint answering calls, etc.

The temperature sensor 180J is used to detect temperature. In some embodiments, the terminal device 100 uses the temperature detected by the temperature sensor 180J to execute a temperature processing strategy. For example, when the temperature reported by the temperature sensor 180J exceeds a threshold, the terminal device 100 reduces the performance of the processor located near the temperature sensor 180J to reduce power consumption and implement thermal protection. In other embodiments, when the temperature is lower than another threshold, the terminal device 100 heats the battery 142 to avoid abnormal shutdown of the terminal device 100 due to low temperature. In other embodiments, when the temperature is lower than another threshold, the terminal device 100 performs a boost on the output voltage of the battery 142 to avoid abnormal shutdown caused by low temperature.

The touch sensor 180K is also called a "touch panel". The touch sensor 180K can be set on the display screen 194, and the touch sensor 180K and the display screen 194 form a touch screen, also called a "touch screen". The touch sensor 180K is used to detect touch operations acting on or near it. The touch sensor can pass the detected touch operation to the application processor to determine the type of touch event. Visual output related to the touch operation can be provided through the display screen 194. In other embodiments, the touch sensor 180K can also be set on the surface of the terminal device 100, which is different from the position of the display screen 194.

The bone conduction sensor 180M can obtain a vibration signal. In some embodiments, the bone conduction sensor 180M can obtain a vibration signal of a vibrating bone block of the vocal part of the human body. The bone conduction sensor 180M can also contact the human pulse to receive a blood pressure beat signal. In some embodiments, the bone conduction sensor 180M can also be set in an earphone and combined into a bone conduction earphone. The audio module 170 can parse out a voice signal based on the vibration signal of the vibrating bone block of the vocal part obtained by the bone conduction sensor 180M to realize a voice function. The application processor can parse the heart rate information based on the blood pressure beat signal obtained by the bone conduction sensor 180M to realize a heart rate detection function.

The key 190 includes a power key, a volume key, etc. The key 190 may be a mechanical key or a touch key. The terminal device 100 may receive key input and generate key signal input related to user settings and function control of the terminal device 100.

Motor 191 can generate vibration prompts. Motor 191 can be used for incoming call vibration prompts, and can also be used for touch vibration feedback. For example, touch operations acting on different applications (such as taking pictures, audio playback, etc.) can correspond to different vibration feedback effects. For touch operations acting on different areas of the display screen 194, motor 191 can also correspond to different vibration feedback effects. Different application scenarios (for example: time reminders, receiving messages, alarm clocks, games, etc.) can also correspond to different vibration feedback effects. The touch vibration feedback effect can also support customization.

Indicator 192 may be an indicator light, which may be used to indicate charging status, power changes, messages, missed calls, notifications, etc.

The SIM card interface 195 is used to connect a SIM card. The SIM card can be connected to and separated from the terminal device 100 by inserting it into the SIM card interface 195 or pulling it out from the SIM card interface 195. The terminal device 100 can support 1 or N SIM card interfaces, where N is a positive integer greater than 1. The SIM card interface 195 can support Nano SIM cards, Micro SIM cards, SIM cards, etc. Multiple cards can be inserted into the same SIM card interface 195 at the same time. The types of the multiple cards can be the same or different. The SIM card interface 195 can also be compatible with different types of SIM cards. The SIM card interface 195 can also be compatible with external memory cards. The terminal device 100 interacts with the network through the SIM card to implement functions such as calls and data communications. In some embodiments, the terminal device 100 uses an eSIM, i.e., an embedded SIM card. The eSIM card can be embedded in the terminal device 100 and cannot be separated from the terminal device 100.

The software system of the terminal device 100 may adopt a layered architecture, an event-driven architecture, a micro-core architecture, a micro-service architecture, or a cloud architecture. The embodiment of the present application takes the Android system of the layered architecture as an example to exemplify the software structure of the terminal device 100.

FIG2 is a software structure diagram of the terminal device 100 of an embodiment of the present application. The layered architecture divides the software into several layers, each layer has a clear role and division of labor. The layers communicate with each other through software interfaces. In some embodiments, the Android system is divided into four layers, from top to bottom, namely, the application layer, the application framework layer, the Android runtime (Android runtime) and the system library, and the kernel layer. The application layer may include a series of application packages.

As shown in FIG. 2 , the application package may include applications such as camera, gallery, calendar, call, map, navigation, WLAN, Bluetooth, music, video, short message, etc.

The application framework layer provides application programming interface (API) and programming framework for the applications in the application layer. The application framework layer includes some predefined functions.

As shown in FIG. 2 , the application framework layer may include a window manager, a content provider, a view system, a telephony manager, a resource manager, a notification manager, and the like.

The window manager is used to manage window programs. The window manager can obtain the display screen size, determine whether there is a status bar, lock the screen, capture the screen, etc.

Content providers are used to store and retrieve data and make it accessible to applications. The data may include videos, images, audio, calls made and received, browsing history and bookmarks, phone books, etc.

The view system includes visual controls, such as controls for displaying text, controls for displaying images, etc. The view system can be used to build applications. A display interface can be composed of one or more views. For example, a display interface including a text notification icon can include a view for displaying text and a view for displaying images.

The phone manager is used to provide communication functions of the terminal device 100, such as management of call status (including connection, disconnection, etc.).

The resource manager provides various resources for applications, such as localized strings, icons, images, layout files, video files, and so on.

The notification manager allows applications to display notification information in the status bar. It can be used to convey notification-type messages and can disappear automatically after a short stay without user interaction. For example, the notification manager is used to notify download completion, message reminders, etc. The notification manager can also appear in the top status bar of the system in the form of icons or scroll bar text, such as notifications of applications running in the background, or in the form of dialog windows on the screen. For example, a text message appears in the status bar, a beep sounds, the terminal device vibrates, the indicator light flashes, etc.

Android runtime includes core libraries and virtual machines. Android runtime is responsible for scheduling and management of the Android system.

The core library consists of two parts: one is the function that needs to be called by the Java language, and the other is the Android core library.

The application layer and the application framework layer run in a virtual machine. The virtual machine executes the Java files of the application layer and the application framework layer as binary files. The virtual machine is used to perform functions such as object life cycle management, stack management, thread management, security and exception management, and garbage collection.

The system library can include multiple functional modules, such as surface manager, media libraries, 3D graphics processing library (such as OpenGL ES), 2D graphics engine (such as SGL), etc.

The surface manager is used to manage the display subsystem and provide the fusion of 2D and 3D layers for multiple applications.

The media library supports playback and recording of a variety of commonly used audio and video formats, as well as static image files, etc. The media library can support a variety of audio and video encoding formats, such as: MPEG4, H.264, MP3, AAC, AMR, JPG, PNG, etc.

The 3D graphics processing library is used to implement 3D graphics drawing, image rendering, compositing, and layer processing.

A 2D graphics engine is a drawing engine for 2D drawings.

The kernel layer is the layer between hardware and software. The kernel layer contains at least display driver, camera driver, audio driver, and sensor driver.

With the development of terminal technology, wearable devices such as Bluetooth headsets and smart watches are increasingly widely used in people's production and life. Wearable devices often need to establish a network connection with terminal devices such as mobile phones to use. Taking the wearable device as a Bluetooth headset as an example, please refer to the usage scenario shown in Figure 3. In Figure 3, the Bluetooth headset 301 transmits data and plays the audio files of the mobile phone by establishing a Bluetooth connection with the mobile phone 302. Usually, the Bluetooth headset 301 can be in standby mode when not in use. In standby mode, the Bluetooth headset 301 can still monitor the broadcast signal of the mobile phone 302. When the Bluetooth headset 301 monitors the broadcast signal sent by the paired mobile phone 302, it can switch to the working state and establish a Bluetooth connection with the mobile phone 302 for use.

Generally, the battery capacity of wearable devices is small. If the standby power consumption is large, the standby time will be shortened, affecting the user experience. In traditional solutions, when the wearable device is in standby mode, the main chip of the communication module in the wearable device (such as a Bluetooth chip or a WIFI chip) is always in the state of sending and receiving; in addition, the receiver itself will also consume a certain amount of power in standby mode, making the standby power consumption relatively large.

The circuit structure of a conventional receiver can be seen in FIG4 , including: a low noise amplifier 401, a mixer 402, a voltage controlled oscillator 403, an amplifier 404, a bandpass filter 405 and an analog-to-digital converter 406. When the antenna receives the received signal, it is amplified by the low noise amplifier 401; then it enters the mixer 402 and the local oscillator signal output by the voltage controlled oscillator 403 for mixing to obtain an intermediate frequency signal; then the intermediate frequency signal enters the amplifier 404 and the filter 405 in turn for amplification and filtering; finally, it enters the analog-to-digital converter 406, and the intermediate frequency signal is converted from an analog signal to a digital signal and enters the baseband (BB) processor for subsequent processing. The above-mentioned amplifier 404 can be a variable gain amplifier (VGA). In the standby state, the amplifier 404 and the voltage controlled oscillator 403 are in the open state, which will consume a certain amount of power. Usually, the power consumption of the amplifier 404 and the voltage controlled oscillator 403 is both in the milliwatt level, so that the lowest standby power consumption is also in the milliwatt level.

The standby power consumption described in this application generally refers to the power consumption in the receiving state.

In order to reduce standby power consumption and extend standby time, a low duty cycle solution for sending and receiving signals can be used to reduce the working time of the main chip. For example, as shown in Figure 5, some wearable devices can receive a 60 millisecond (ms) transmission signal every 600 milliseconds (ms) when in standby mode, that is, the duty cycle is 10%. In this way, the time it takes for the wearable device to receive the signal is reduced, effectively reducing standby power consumption. If it is the transmitting end, a 3ms signal can be sent every 20ms, that is, the duty cycle is 15%. The transmitting end also reduces the duration of the transmitted signal, which can reduce power consumption in the transmitting state. Table 1 shows the measured standby current (including transmitting current and receiving current) of three different chips in standby mode:

Table 1

The transmission signal in Table 1 is shown as an example of the transmission current when the transmission power is 0 decibel milliwatt (dBm). It can be seen from Table 1 that the standby current is at the milliampere level regardless of the transmission state or the reception state. Calculated based on the chip power supply voltage of 3.3 volts (V), the standby power consumption is at the milliwatt level. In the low duty cycle solution, the greater the duty cycle of the transceiver signal, the greater the standby power consumption; the smaller the duty cycle of the transceiver signal, the greater the delay, which affects the user experience.

The IEEE protocol 802.11ba proposes a low power wake-up receiver (LP-WUR) solution, which divides 4MHz from the 20HMz working bandwidth of 2.4G-WIFI as the transmission bandwidth of the wake-up sequence. In FIG6, the establishment of WIFI communication between the router 601 and the terminal device 602 is taken as an example. The router 601 can broadcast a broadcast signal carrying the wake-up sequence within the divided 4MHz bandwidth. A low power wake-up circuit is set in the WIFI module of the terminal device. The low power wake-up circuit is connected to the antenna and is used to monitor the broadcast signal. When the low power wake-up circuit receives the broadcast signal broadcast from the router 601 through the antenna, it can send a wake-up signal to the main chip of the WIFI module to wake up the WIFI module to restore to the working state and establish a WIFI communication connection with the router 601. If the router 601 does not broadcast the broadcast signal carrying the wake-up sequence, the low power wake-up circuit does not need to output the wake-up signal. At this time, the main chip of the WIFI module and the original transceiver path can remain in a dormant state (or closed state) to save power consumption. If the low-power receiver wake-up solution is combined with the duty cycle method, the standby power consumption can be further reduced, as shown in the standby power consumption curve shown in Figure 7. In Figure 7, the traditional power saving mode-polling (PS-poll) module solution and the traditional receiver combined with the low duty cycle solution have a standby power consumption of about 1.6mW; while the low-power receiver wake-up solution in the IEEE protocol 802.11ba, when the low-power wake-up circuit is always on, the standby power consumption is about 105 microwatts (μW); if the low-power wake-up circuit is combined with the duty cycle solution, when waking up for 2ms every 100ms (i.e., the duty cycle is 2%), the standby power consumption is about 7μW, and the standby power consumption is significantly reduced.

However, the above receiver scheme has weak anti-interference performance. Taking the traditional receiver shown in Figure 4 as an example, if the interference signal is white noise, since the power spectral density of white noise does not change with frequency, and white noise is random noise, for example, the power spectral density of white noise at room temperature is -174dBm/Hz. White noise is different from useful signals (such as received signals), and the energy of useful signals is concentrated at a certain frequency. In a certain period of time, useful signals can accumulate more energy, while the power spectral density of random white noise is always -174dBm/Hz. Therefore, in a certain period of time, the accumulated energy of white noise remains unchanged, while the useful signal accumulates more energy, so the signal-to-noise ratio can be improved. For 2.4G WIFI For the interference signal in the frequency band, it is not random noise. Even as the accumulation time becomes longer, the energy of the useful signal and the interference signal will accumulate more. Therefore, the signal-to-noise ratio cannot be effectively improved by time accumulation, and the out-of-band interference signal cannot be filtered out. In the low-power wake-up receiver shown in Figure 6, since a part of the existing communication frequency band is reused to transmit the wake-up sequence, there will be a problem of co-frequency interference. For example, when the wake-up sequence uses the 2.4G frequency band, it may be interfered by the 2.4G WIFI signal, the 2.4G Bluetooth low energy (bluetooth low energy, BLE) signal and the 2.4G industrial-scientific-medical (industrial scientific medical band, ISM) signal in the space. In particular, when the 2.4G WIFI signal bandwidth is a 20MHz broadband signal, it covers the transmission frequency band of the wake-up sequence, which may interfere with the transmission of the wake-up sequence, resulting in false wake-up caused by the interference signal, or causing the receiver to be unable to accurately identify the wake-up sequence and wake up the receiver in time, affecting the communication quality between devices.

The present application proposes a low-power wake-up circuit, which is applied to a receiver, and the receiver can be used in a communication module. The communication module can be a Bluetooth module, a WIFI module or other communication module. The receiver also includes a main receiving path. Among them, the main receiving path is connected to the main chip, and is used to transmit the received signal to the main chip for processing. Usually, when the communication module does not perform network communication, the main receiving path and the main chip can be in a dormant state (or called a closed state). The low-power wake-up circuit can be in an open state and used to monitor broadcast signals. Since the standby power consumption of the low-power wake-up circuit is low, the standby power consumption of the device can be reduced. When the low-power wake-up circuit monitors the broadcast signal, it can output a wake-up signal to the main chip to wake up the main chip and the main receiving path from the dormant state to the working state. The above-mentioned low-power wake-up circuit includes a narrowband filter and a low-power receiving path. Since the passband of the narrowband filter is narrow, it can effectively filter out interference signals whose frequencies are outside the passband, thereby improving the anti-interference ability of the low-power wake-up circuit, thereby improving the wake-up success rate.

FIG8 shows an application scenario of a low-power wake-up circuit provided by an embodiment of the present application. In FIG8 , a device in a standby state can be referred to as an awakened object 802, and a mobile phone 801 is used as an example of a device that initiates a connection request. The mobile phone 801 can be a device using multicarrier on-off keying (MC-OOK) technology. As shown in FIG8 , when a user on the mobile phone side needs to establish network communication between the mobile phone 801 and the awakened object 802 (shown as an example of establishing Bluetooth communication in FIG8 ), the mobile phone 801 can be operated to send a connection request through the communication module and antenna in the mobile phone 801, and the request can be sent in the form of a broadcast signal. The frequency of the broadcast signal is within the passband range of the narrowband filter of the low-power wake-up circuit, so it can be received by the antenna of the awakened object and filtered out of the interference signal outside the band through the narrowband filter, and enter the low-power receiving path, thereby generating a wake-up signal. Afterwards, the wake-up signal output by the low-power receiving path can be input to the main chip to wake up the main chip. Optionally, the main receiving path can also enter the working state after the main chip is awakened.

In some embodiments, the wake-up signal output by the low-power receiving path can also be directly input into the main receiving path to wake up the main receiving path and enter the working state, which is not limited in the embodiments of the present application. When the main chip and the main receiving path are awakened, Bluetooth communication can be established between the awakened object 802 and the mobile phone 801.

Optionally, the main receiving path shown in the awakened object 802 in FIG. 8 may generally be referred to as a radio frequency front-end module, which may include radio frequency devices such as amplifiers, mixers, filters, etc., for example, for processing radio frequency signals.

It should be noted that the main receiving path in the embodiment of the present application is a path that has the function of processing received signals, but it is not necessarily a path that only processes received signals. It can also be a circuit designed to be compatible with the transmitting path and can also be used to process transmitted signals. When the main receiving path is compatible with the transmitting path, it can also include the components and connection methods required by other transmitting paths, which will not be described in detail here. The receiver involved in the embodiment of the present application is a receiver with A module with receiving function does not necessarily refer to a module that processes receiving signals alone, but may also be a module designed to be compatible with a transmitter and can also be used to process transmitting signals. When the receiver is compatible with a transmitter, it may also include other components and connection methods required by the transmitter, which will not be described here.

The information interaction process between the mobile phone 801 and the awakened object 802 in Figure 8 can also be seen in Figure 9. In order to emphasize the information and timing of the interaction between the modules, the mobile phone 801 is shown in Figure 9 as a transmitter, and the awakened object 802 is shown as including a low-power wake-up circuit, a main chip and a main receiving path. As shown in Figure 9, the main chip and the main receiving path are usually in a dormant state (off state), which will not cause power consumption loss; when the transmitter broadcasts the wake-up sequence, the low-power wake-up circuit in the monitoring state can receive the wake-up sequence through the antenna. Then, the low-power wake-up circuit can output a wake-up signal to the main chip and the main receiving path after verifying the wake-up sequence. At this time, the main chip and the main receiving path can switch from the dormant state to the working state, and establish a communication connection with the transmitter to achieve communication interaction.

For ease of understanding, the following embodiments of the present application will take a terminal device having the structure shown in Figures 1 and 2 as an example, and combine the accompanying drawings and application scenarios to specifically explain the structure and working principle of the low-power wake-up circuit provided in the embodiments of the present application.

FIG10 is a schematic diagram of the circuit structure of the low-power wake-up circuit provided in an embodiment of the present application. The low-power wake-up circuit shown in FIG10 includes a narrowband filter 1001 and a low-power receiving path 1002. Among them, one end of the narrowband filter 1001 is connected to the antenna, and the other end is connected to the low-power receiving path 1002. The specific structure of the low-power receiving path 1002 is not limited. When the object to be awakened is in a standby state, the main receiving path and the main chip of the object to be awakened are both in a dormant state, and the low-power wake-up circuit is in a monitoring state, and can monitor the broadcast signal broadcast by the transmitter. The broadcast signal enters the low-power wake-up circuit along with the interference signal in the space, and is filtered by the narrowband filter 1001. At this time, the out-of-band interference signal will be filtered out (i.e., suppressed). The filtered broadcast signal enters the low-power receiving path 1002. If the wake-up sequence carried by the broadcast signal matches the preset sequence, it means that the transmitter that sends the broadcast signal is a device paired with the object to be awakened, so the low-power wake-up circuit can output a wake-up signal to wake up the object to be awakened. The preset sequence here can be a logic level alternating between high and low, such as a binary number series such as 0101101. The embodiment of the present application does not limit the number of bits and content of the preset sequence, as long as it can represent the identity of the transmitter. If the wake-up sequence carried by the received broadcast signal does not match the preset sequence, it means that the wake-up sequence carried by the broadcast signal is not a wake-up sequence for waking up the object to be awakened, and the transmitter that sends the broadcast signal is not a device paired with the object to be awakened. At this time, the low-power wake-up circuit will not output a wake-up signal. The above preset sequence can be a sequence pre-stored in the low-power wake-up circuit, representing the identity of the transmitter paired with the object to be awakened.

In the low-power wake-up circuit shown in FIG. 10 above, since the narrowband filter has the characteristic of narrow passband, the frequency of the interference signal is more likely to fall outside the passband of the narrowband filter. The narrowband filter can effectively filter out most of the interference signals outside the passband, prevent the interference signals from entering the low-power receiving path, and enhance the anti-interference ability of the low-power wake-up circuit, thereby improving the success rate of wake-up. At the same time, the accuracy of the sequence recognition carried by the broadcast signal by the low-power wake-up circuit will be improved, so the accuracy of the output wake-up signal will also be improved accordingly, which can avoid the occurrence of false wake-up triggered by the interference signal, improve the communication quality between devices, and enhance the user experience. In addition, the low-power wake-up circuit shown in FIG. a in FIG. 10 has a lower delay than the solution using a low duty cycle, and the timeliness of outputting the wake-up signal is higher while ensuring low standby power consumption, avoiding the situation of untimely wake-up and improving the user experience.

The narrowband filter 1001 in the embodiment of the present application may be an ultra-narrowband filter, for example, the bandwidth of the passband is KHz. In one implementation, the ultra-narrowband filter may be composed of a high-harmonic bulk acoustic wave resonator (HBAR) 10011 and a bandpass filter (BPF) 10012 connected in series, as shown in FIG. 11 a.

In some embodiments, the interval between any two adjacent resonant frequencies of the high-order harmonic bulk acoustic wave resonator can range from 10MH to 100MHz, the bandwidth of the resonant frequency of the high-order harmonic bulk acoustic wave resonator can range from 50KHz to 1000KHz, and the difference between the passband bandwidth of the bandpass filter and the interval between any two adjacent resonant frequencies of the high-order harmonic bulk acoustic wave resonator is less than a preset difference.

The difference between the passband bandwidth of the bandpass filter and the interval between any two adjacent resonant frequencies of the high-order harmonic bulk acoustic wave resonator is less than the preset difference, indicating that the difference between the two is small. The bandpass filter can select a signal of a resonant frequency of the high-order harmonic bulk acoustic wave resonator, thereby filtering out most of the interference signals, realizing ultra-narrowband filtering, and improving the anti-interference ability of the low-power wake-up circuit.

Among them, HBAR is a resonator with a frequency response curve having multiple repeated narrow peaks, each narrow peak corresponds to a resonant frequency. Taking the interval between any two adjacent resonant frequencies of the high-order harmonic bulk acoustic wave resonator as 20MHz, the bandwidth of the resonant frequency of the high-order harmonic bulk acoustic wave resonator as 120KHz, and the passband bandwidth of the bandpass filter as 20MHz as an example, the frequency response curve of HBAR can be shown in Figure c in Figure 11. Since HBAR has an extremely high quality factor (Q value), it can achieve an extremely narrow bandwidth of the resonant frequency. For example, when the Q value of HBAR is greater than 20000, when the center frequency is around 2.4GHz, the bandwidth of each resonant frequency can be as narrow as 120KHz. Among them, the frequency interval between adjacent resonant frequencies of HBAR can be adjusted by adjusting the thickness of the substrate of HBAR to adapt to different needs. In the ultra-narrowband filter, a BPF is set at the back end of HBAR, and one or more of the multiple repeated narrow peaks of HBAR can be selected, that is, one or more resonant frequencies can be selected. Among them, the frequency response curve of BPF can be shown in Figure b in Figure 11. The center frequency and passband bandwidth of the BPF passband determine which resonant frequencies of the HBAR are selected. FIG11 shows a frequency response curve diagram of the superposition of HBAR and BPF with the passband bandwidth of the BPF being 20 MHz and the frequency of the HBAR being adjacent to the resonant frequency. When the HBAR and the BPF are connected in series, the center frequency of the passband of the BPF is close to one of the resonant frequencies of the HBAR, and the signal of this resonant frequency can be selected to achieve the function of ultra-narrowband filtering. FIG11 a shows the situation where HBAR10011 is in front and BPF10012 is in the back. In other embodiments, HBAR10012 and BPF10011 can also be interchanged, such as shown in FIG11 e, where BPF10012 is in front and HBAR10011 is in the back. That is, the received signal first passes through BPF10012 to filter out the interference signal at the far end of the passband, and then passes through HBAR10011 to filter out the interference signal at the near end, thereby achieving narrowband filtering. Optionally, the ultra-narrowband filter may further include a matching network, which may be T-type, L-type or π-type, which is not limited in the embodiments of the present application, as long as it can perform impedance tuning for the ultra-narrowband filter.

The previous article introduced the structure of the narrowband filter in the low-power wake-up circuit and the principle of narrowband filtering. The following will describe in detail the circuit structure of the low-power receiving path in the low-power wake-up circuit.

In some embodiments, the specific structure of the low-power receiving path 1002 in the above-mentioned low-power wake-up circuit can be as shown in Figure a of Figure 12, including: a mixer 10021, an intermediate frequency filter 10022, an analog to digital converter (ADC) 10023, and a correlator 10024. Among them, the ADC can be a comparator. After the broadcast signal passes through the narrowband filter 1001, it can be divided into two paths and enter the local oscillator port and the radio frequency port of the mixer 10021 for self-mixing. The broadcast signal after self-mixing is output by the intermediate frequency port of the mixer 10021 and filtered out multiple harmonics through the intermediate frequency filter 10022 to obtain an intermediate frequency analog signal. The intermediate frequency analog signal enters the ADC for analog-to-digital conversion to obtain a digital signal. The digital signal enters the correlator 10024 for decoding to obtain a wake-up sequence. Correlator 10024 The decoded wake-up sequence is compared with the preset sequence stored in the correlator 10024. If the two match, a wake-up signal can be output, and the wake-up signal can be a high level; if the two do not match, the wake-up signal may not be output, or a low level may be output. Optionally, judging whether the two sequences match may be judging whether the two sequences are consistent. If they are consistent, the two sequences are considered to match; if they are inconsistent, the two sequences are considered to be inconsistent. In some embodiments, when comparing the two sequences, a partial bit comparison method can also be used. For example, if it is found during the comparison that the first N bits of the wake-up sequence and the first N bits of the preset sequence are already inconsistent, there is no need to compare the following bits, and it is directly determined that the two do not match. Optionally, multiple awakened objects can also be divided into a group, and the multiple awakened objects included in the group correspond to the same group identifier (Group ID). The Group ID can also be used as a preset sequence. If the received wake-up sequence matches the Group ID, the two sequences are deemed to match. When multiple awakened objects in the same group receive this Group ID, these multiple awakened objects can be awakened.

In some cases, the signal strength received by the antenna may be relatively weak, so the low-power receiving path 1002 in the low-power wake-up circuit may also include an amplifier 10025 to amplify the broadcast signal before processing. Adding the amplifier 10025 to amplify the broadcast signal can avoid the problem of inaccurate decoding caused by the received broadcast signal strength being too low. Even if the distance from the transmitter is relatively far or the antenna performance is poor, the low-power wake-up circuit can effectively and accurately parse the broadcast signal, making the low-power wake-up circuit more widely used.

For example, the specific structure of the low-power receiving path 1002 including the amplifier 10025 can be shown in Figure b of Figure 12, including: a mixer 10021, an amplifier 10025, an intermediate frequency filter 10022, an ADC 10023 and a correlator 10024. After the broadcast signal passes through the narrowband filter 1001, it is first divided into two paths and enters the local oscillator port and the radio frequency port of the mixer 10021 for self-mixing. After self-mixing, it is output from the intermediate frequency port of the mixer 10021 and amplified by the amplifier 10025, and then filtered out multiple harmonics by the intermediate frequency filter 10022 to obtain an intermediate frequency analog signal. After that, the intermediate frequency analog signal enters the ADC 10023 for analog-to-digital conversion to obtain a digital signal. Among them, the amplifier 10025 can be a baseband low noise amplifier (BB-LNA) to ensure that the amplified signal has a higher signal-to-noise ratio. Since the signal output from the intermediate frequency port of the mixer 10021 contains multiple harmonics generated by mixing, not all of these harmonics are useful signals. If the multiple harmonics after mixing are filtered and then amplified, the gain of the amplifier 10025 for the unnecessary harmonics (which can be called interference signals or spurious signals) suppressed by the intermediate frequency filter 10022 before may be greater than the gain of the intermediate frequency analog signal to be amplified, resulting in a stronger spurious signal. The circuit structure shown in Figure b of Figure 12, in which the intermediate frequency filter 10022 is set after the amplifier 10025, can ensure a high degree of suppression of unnecessary harmonics (usually, it can reach the suppression degree of the stop band of the intermediate frequency filter 10022), ensure that the intensity of the output spurious signal is low, thereby improving the accuracy of the wake-up signal output by the low-power wake-up circuit, and further improving the wake-up success rate.

For another example, the positions of the amplifier 10025 and the intermediate frequency filter 10022 in the above-mentioned figure b of FIG. 12 can also be interchanged, and the specific structure of the low-power receiving path 1002 can be shown in the figure c of FIG. 12, where the broadcast signal output by the narrowband filter 1001 passes through the mixer 10021, the intermediate frequency filter 10022, the amplifier 10025, the ADC 10023 and the correlator 10024 in sequence. After the broadcast signal passes through the narrowband filter 1001, it can first be divided into two paths and enter the local oscillator port and the radio frequency port of the mixer 10021 for self-mixing, and after self-mixing, it is output from the intermediate frequency port of the mixer 10021 and enters the intermediate frequency filter 10022 to filter out multiple harmonics to obtain an intermediate frequency analog signal, and then enters the amplifier 10025 for amplification, and the amplifier 10025 can use a BB-LNA. After that, the intermediate frequency analog signal enters the ADC 10023 for analog-to-digital conversion to obtain a digital signal. The circuit structure in which the intermediate frequency filter 10022 is arranged before the amplifier 10025 as shown in FIG. 12 c can ensure that the signal input to the amplifier 10025 is not only the intermediate frequency analog signal, but also the intermediate frequency analog signal. The low intensity of other harmonics can ensure that the amplifier has sufficient gain for the intermediate frequency analog signal, and will not waste the power consumption of the amplifier 10025 due to amplifying other unnecessary harmonics at the same time, thereby avoiding the situation of insufficient gain for the useful intermediate frequency analog signal.

The mixer in the above low-power wake-up circuit only generates gate current, and the power consumption is extremely low. In addition, the use of VCO and RF LNA is avoided in the low-power wake-up circuit. The standby power consumption can be reduced to less than 10uW, achieving a low-power standby state.

The above-mentioned Figures 10 and 12 show a circuit structure including a narrowband filter and a low-power receiving path in the low-power wake-up circuit. In some embodiments, the low-power wake-up circuit may also include a plurality of narrowband filters and a plurality of low-power receiving paths corresponding to each other, and each narrowband filter is connected to the corresponding low-power receiving path to form a channel. When the number of narrowband filters 1001 and low-power receiving paths 1002 in the low-power wake-up circuit is multiple, the low-power wake-up circuit may also include a voting circuit 1003, for example, as shown in Figures 13 and 14, where Figures 13 and 14 respectively take three narrowband filters (1001-A, 1001-B and 1001-C) and three low-power receiving paths (1002-A, 1002-B and 1002-C) as examples (i.e., three channels are illustrated). In fact, the low-power receiving paths in the low-power wake-up circuit may also be two, four, five or other numbers, and the corresponding narrowband filters may also be two, four, five or other numbers, which are not limited in the embodiments of the present application. These three channels work simultaneously, wherein the passband frequency of each narrowband filter is different, and broadcast signals of different frequencies can be selected respectively. When the interference signal in the space is close to or even the same as the passband frequency of one of the narrowband filters, if the broadcast signal that can be selected using the passband frequency of this narrowband filter is interfered by the interference signal. At this time, the transmitter can change the frequency of the original broadcast signal and use one of the passband frequencies of other narrowband filters to send the broadcast signal, that is, avoid the interference channel, thereby avoiding interference by the interference signal. The transmitter can also send broadcast signals of different frequencies in turn. For example, the transmitter sends broadcast signals of three frequencies in time-sharing, and these three frequencies correspond to the frequencies of the passbands of the narrowband filters of channels 1001-A, 1001-B, and 1001-C. For example, the three frequency signals sent by the transmitter in time-sharing are broadcast signals of 2405MHz, 2442MHz, and 2479MHz, respectively, and the center frequencies of the passbands of the narrowband filters of the three channels can be 2405MHz, 2442MHz, and 2479MHz, respectively.

The number of narrowband filters in the above-mentioned low-power wake-up circuit can be two or three, and the number of low-power receiving paths in the low-power wake-up circuit can also be two or three accordingly, which can balance the anti-interference performance and the circuit cost, and is therefore more reasonable.

The input end of the voting circuit in FIG. 13 is connected to each low-power receiving path, and the output end of the voting circuit is used to generate a wake-up signal according to the output results of multiple low-power receiving paths. The number of input ends of the voting circuit may be greater than or equal to the number of narrowband filters. Optionally, the voting circuit may be a circuit for OR operation with two or three inputs, such as an OR gate. Taking a three-input voting circuit as an example, when one of the three input signals has a low-power receiving path outputting a high level, the voting circuit may output a high level as a wake-up signal, and the wake-up signal may not be accurately output due to the fact that the frequency of the interference signal is the same or similar to that of a broadcast signal, thereby avoiding interference signals, thereby improving the anti-interference capability and the success rate of wake-up.

Optionally, the voting circuit can also be a circuit for AND operation with two or three inputs, such as an AND gate. The number of input terminals of the voting circuit can be greater than or equal to the number of narrowband filters. Taking a voting circuit with three inputs as an example, when the three low-power receiving paths of the three input signals all output a high level, the voting circuit can output a high level as a wake-up signal. That is, the voting circuit can only output a high level as a wake-up signal when the transmitting end sends three broadcast signals of different frequencies. Output a wake-up signal, which can avoid false wake-up caused by interference signals and improve the accuracy of the output wake-up signal. In order to facilitate the understanding of the circuit structure in Figure 14 above, Figure 15 divides the circuit structure shown in Figure 14 according to the basic functions of the circuit, including: RF circuit, baseband analog circuit and baseband digital circuit. Among them, the narrowband filter and the related matching network can be collectively referred to as the filter matching network, which works in the RF frequency band and belongs to the RF circuit; the mixer, amplifier, intermediate frequency filter and comparator work in the intermediate frequency band and belong to the baseband analog circuit; the correlator and voting circuit belong to the baseband digital circuit.

In some embodiments, the low-power wake-up circuit can use different antennas from the applied receiver. In other embodiments, the low-power wake-up circuit can also use the same antenna as the applied receiver, and switch through a switch. Specifically, the switch is connected to the low-power wake-up circuit, the main receiving path and the antenna respectively, and is used to connect the antenna and the main receiving path when the low-power wake-up circuit outputs a wake-up signal. In some embodiments, the switch can also be other types of switches, such as a single-pole three-throw switch, a double-pole double-throw switch, etc., as long as it can realize the switching of the main structure path and the low-power wake-up circuit; in some embodiments, the switch can also share other switches in other functional modules or part of the path in other switches, as long as it can ensure the normal function of the circuit. In the standby state, the switch connects the low-power wake-up circuit and the antenna; when the voting circuit outputs a wake-up signal, the main chip is awakened, and the switch can be switched to a state of connecting the antenna and the main receiving path under the control of the main chip, so that the receiver switches from the sleep state to the working state. In some embodiments, in the standby state, the switch is in an unpowered state. At this time, the switch connects the low-power wake-up circuit and the antenna by default. When the wake-up signal is generated, it is powered on to connect the antenna and the main receiving path. In this way, in the standby state, the switch is not powered on, which can further save standby power consumption. The switch in Figure 16 is shown as a single-pole double-throw switch, in which the common end of the single-pole double-throw switch is connected to the antenna, and the other two ends are respectively connected to the narrowband filter of the main receiving path and the low-power wake-up circuit. Using a switch to select the main receiving path and the low-power wake-up circuit can realize antenna multiplexing without changing the structure of the existing communication system, and saves the number of antennas, reducing the cost and difficulty of antenna design.

The above describes in detail the low-power wake-up circuit provided by the present application and examples of a receiver including the low-power wake-up circuit. It can be understood that in order to realize the above functions, the corresponding electronic device includes a hardware structure corresponding to executing each function.

In actual usage scenarios, the passband frequency of the filter will have a certain degree of temperature drift, that is, the passband frequency will shift with changes in temperature. For the narrowband filter in the embodiment of the present application, when the narrowband filter drifts in temperature under the condition of ambient temperature changes, the broadcast signal may directly fall into the stopband of the narrowband filter, resulting in the inability to pass through the narrowband filter and be suppressed, and the receiver cannot be woken up. The embodiment of the present application proposes a mechanism for repeated transmission and reception, and the frequency of the broadcast signal sent by the transmitter is set to an adjustable frequency. These adjustable frequencies can cover the temperature drift range of the narrowband filter, and then the transmitter repeats the transmission in these adjustable frequencies. Even if the narrowband filter has temperature drift, after the rotation, the transmitter will always send a broadcast signal that falls within the passband of the narrowband filter, thereby outputting a wake-up signal. This method can avoid the situation where the receiver cannot be accurately woken up due to temperature drift, improve the applicable temperature range of the low-power wake-up circuit, and have a wider range of usage scenarios.

FIG17 is a flowchart of a method for sending a wake-up sequence provided in an embodiment of the present application, which is applied to a first electronic device, the first electronic device may be a transmitter of a broadcast signal, the broadcast signal carries a wake-up sequence, the wake-up sequence can characterize the identity of the first electronic device, the first electronic device is used to send the wake-up sequence to a second electronic device, the second electronic device includes a low-power wake-up circuit, and the low-power wake-up circuit includes at least one narrowband filter. The method includes:

S1701: A first electronic device receives a connection instruction, where the connection instruction is used to instruct the first electronic device to establish a network connection with a second electronic device.

S1702: In response to the connection instruction, the first electronic device sends a wake-up sequence to the second electronic device according to a plurality of frequencies in a preset frequency set.

When a user needs to connect a mobile phone as a first electronic device and a Bluetooth headset as a second electronic device, a connection instruction can be input to the first electronic device, such as clicking the logo of the Bluetooth headset in the first electronic device. The mobile phone receives the connection instruction triggered by the user's click operation and can repeatedly send a broadcast signal carrying a wake-up sequence at an adjustable frequency that can cover the temperature drift range of the narrowband filter.

For example, the above-mentioned multiple frequencies are frequencies in a preset frequency set, and the multiple frequencies in the preset frequency set can cover a first frequency range, and the first frequency range is the drift range of the center frequency of the passband of the narrowband filter within the preset temperature range, and can also be the drift range of the center frequency of the passband of the narrowband filter within the preset temperature range. Any two adjacent frequencies in the above-mentioned preset frequency set differ by a preset bandwidth. Optionally, the above-mentioned preset temperature range can be a range of -20 degrees to 60 degrees.

Optionally, when the low-power wake-up circuit includes a narrowband filter, the first frequency range may be a drift range of the passband frequency or the center frequency of the narrowband filter within a preset temperature range; when the low-power wake-up circuit includes multiple narrowband filters, the first frequency range may be the sum of the drift ranges of the passband frequencies or the center frequencies of the multiple narrowband filters within a preset temperature range.

Optionally, the preset bandwidth can be a value in the range of 50KHz-1000Hz, as long as it is the same or similar to the passband bandwidth of the narrowband filter in the low-power wake-up circuit, it can ensure that the broadcast signal sent according to the preset bandwidth can normally enter the low-power wake-up circuit for analysis.

Optionally, the preset temperature range may be from -20 degrees to 60 degrees.

Specifically, the temperature coefficient of the RF filter is usually -26ppm (parts per million). Taking the temperature coefficient of the narrowband filter as -26ppm as an example, within the temperature range of -20 degrees to 60 degrees, the frequency offset of the narrowband filter is: 26ppm*[60-(-20)] degrees*f0. Among them, taking f0 as 2450MHz as an example, the frequency offset is: 26ppm*[60-(-20)] degrees*2450MHz＝5.096MHz≈5.2MHz (considering the error of the processing technology of the hardware circuit, a certain margin is left in the range of frequency offset). If a 120KHz narrowband filter is used, 5.2MHz/120KHz≈44, then the passband frequency of the narrowband filter varies between approximately 2447.36MHz and 2452.64MHz. Then the transmitter can transmit in the frequency range of 2447.36MHz to 2452.64MHz at intervals of 120KHz, for example, 2447.36MHz, 2447.48MHz, 2447.60MHz, 2447.72MHz, 2447.84MHz, 2448.96MHz... until 2452.64MHz, for a total of 45 times. Of course, the center frequency of other narrowband filters also shifts under different temperature changes. The transmitter can calculate the frequency of the broadcast signal to be transmitted and send the broadcast signal according to the above method, which can avoid the situation where the receiver cannot be accurately woken up due to temperature drift, and improve the applicable temperature range of the low-power wake-up circuit, and the use scenario is more extensive.

Optionally, the transmitter can also collect commonly used temperature ranges, such as 0-30 degrees, and send the corresponding frequency points within the temperature range of 0-30 degrees. The calculation method can be 26ppm*(30-0) degrees*2450MHz=1.911MHz≈2MHz (considering the error of the processing technology of the hardware circuit, a certain margin is left in the range of frequency offset), 2MHz/120KHz≈16. Then the transmitter can send in the frequency range of 2449.04MHz to 2450.96MHz at a frequency interval of 120KHz, for example, sending 2449.04MHz, 2449.16MHz, 2449.28MHz... until 2450.96MHz, a total of 17 times. In this way, while covering commonly used temperatures, In order to reduce the number of transmissions, a round of broadcast signals can be sent quickly, reducing the delay of the wake-up operation and improving the wake-up efficiency.

After the second electronic device receives the broadcast signal carrying the wake-up sequence sent by the first electronic device, it can process the broadcast signal with reference to the description in the aforementioned embodiment and identify the wake-up sequence, which will not be described in detail here.

The above describes in detail an example of the wake-up sequence sending method provided by the present application. It is understandable that, in order to implement the above functions, the corresponding device includes a hardware structure and/or software module corresponding to the execution of each function. Those skilled in the art should easily realize that, in combination with the units and algorithm steps of each example described in the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of this application.

The present application can divide the functional modules of the wake-up sequence sending device according to the above method example. For example, each function can be divided into each functional module, or two or more functions can be integrated into one module. The above integrated module can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of modules in the present application is schematic and is only a logical functional division. There may be other division methods in actual implementation.

FIG18 shows a schematic diagram of the structure of a wake-up sequence sending device provided by the present application. Device 1800 is applied to a first electronic device, the first electronic device is used to send a wake-up sequence to a second electronic device, the wake-up sequence is used to characterize the identity of the first electronic device, the second electronic device includes a low-power wake-up circuit, the low-power wake-up circuit includes at least one narrowband filter; device 1800 includes:

The receiving module 1801 is used to control the first electronic device to receive a connection instruction, where the connection instruction is used to instruct the first electronic device to establish a network connection with the second electronic device.

The sending module 1802 is used to control the first electronic device to respond to the connection instruction and send a wake-up signal to the second electronic device according to multiple frequencies in a preset frequency set; wherein the multiple frequencies are frequencies within a first frequency range, the preset frequency set includes a first frequency and a second frequency, the first frequency and the second frequency differ by a preset bandwidth, the first frequency is any one of the multiple frequencies, the second frequency is different from the first frequency, and the first frequency range is the drift range of the center frequency of the passband of at least one narrowband filter within a preset temperature range.

The specific manner in which the apparatus 1800 executes the wake-up sequence sending method and the beneficial effects produced can be found in the relevant description in the method embodiment, which will not be repeated here.

An embodiment of the present application also provides an electronic device, including the above-mentioned processor. The electronic device provided in this embodiment may be the terminal device 100 shown in Figure 1, which is used to execute the above-mentioned wake-up sequence sending method. In the case of an integrated unit, the terminal device may include a processing module, a storage module and a communication module. Among them, the processing module can be used to control and manage the actions of the terminal device, for example, it can be used to support the terminal device to execute the steps performed by the display unit, the detection unit and the processing unit. The storage module can be used to support the terminal device to execute stored program codes and data, etc. The communication module can be used to support the communication between the terminal device and other devices.

The processing module may be a processor or a controller. It may implement or execute various exemplary logic blocks, modules and circuits described in conjunction with the disclosure of this application. The processor may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of digital signal processing (DSP) and a microprocessor, etc. The storage module may be a memory. The communication module may specifically be a radio frequency circuit, a Bluetooth Controller, or a Bluetooth Controller. Devices that interact with other terminal devices, such as dental chips, Wi-Fi chips, etc.

In one embodiment, when the processing module is a processor and the storage module is a memory, the terminal device involved in this embodiment may be a device having the structure shown in FIG. 1 .

An embodiment of the present application further provides a computer-readable storage medium, in which a computer program is stored. When the computer program is executed by a processor, the processor executes the wake-up sequence sending method described in any of the above embodiments.

The embodiment of the present application further provides a computer program product. When the computer program product is run on a computer, the computer is enabled to execute the above-mentioned related steps to implement the wake-up sequence sending method in the above-mentioned embodiment.

Among them, the electronic device, computer-readable storage medium, computer program product or chip provided in this embodiment are all used to execute the corresponding methods provided above. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the corresponding methods provided above and will not be repeated here.

In several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of modules or units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, the replaced units may or may not be physically separated, and the components displayed as units may be one physical unit or multiple physical units, that is, they may be located in one place, or they may be distributed in multiple different places. Some or all of the units may be selected according to actual needs to achieve the purpose of the scheme of this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a readable storage medium. Based on this understanding, the technical solution of the embodiment of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions to enable a device (which can be a single-chip microcomputer, chip, etc.) or a processor (processor) to execute all or part of the steps of the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk and other media that can store program code.

The above contents are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

A low-power wake-up circuit, characterized in that it is applied to a receiver, the circuit comprises: at least one narrowband filter and at least one low-power receiving path, the at least one narrowband filter and the at least one low-power receiving path correspond one to one;

The first narrowband filter is respectively connected to the antenna and the first low-power receiving path corresponding to the first narrowband filter, the first narrowband filter is any one of the at least one narrowband filter, and the first low-power receiving path is one of the at least one low-power receiving path.
The circuit according to claim 1 is characterized in that the at least one low-power receiving path is used to output a wake-up signal when the wake-up sequence carried by the signal received by the antenna matches the preset sequence.
The circuit according to claim 2, characterized in that the first narrowband filter comprises: a high-order harmonic bulk acoustic wave resonator and a bandpass filter;

The high-order harmonic bulk acoustic wave resonator is connected to the antenna and the bandpass filter respectively, and the bandpass filter is connected to the first low-power receiving path; or,

The bandpass filter is connected to the antenna and the high-order harmonic bulk acoustic wave resonator, respectively, and the high-order harmonic bulk acoustic wave resonator is connected to the first low-power consumption receiving path.
The circuit according to claim 3 is characterized in that the interval between any two adjacent resonant frequencies of the high-harmonic bulk acoustic wave resonator is in the range of 10 MHz-100 MHz, the bandwidth of the resonant frequency of the high-harmonic bulk acoustic wave resonator is in the range of 50 KHz-1000 KHz, and the difference between the passband bandwidth of the bandpass filter and the interval between any two adjacent resonant frequencies of the high-harmonic bulk acoustic wave resonator is less than a preset difference.
The circuit according to claim 3 or 4, characterized in that the first low-power receiving path comprises: a mixer, an intermediate frequency filter, an analog-to-digital conversion circuit and a correlator;

The mixer is used to perform self-mixing on the wake-up signal filtered by the first narrowband filter, and transmit the signal generated by the self-mixing to the intermediate frequency filter;

The intermediate frequency filter is used to filter the signal output by the mixer and transmit the intermediate frequency analog signal obtained by filtering to the analog-to-digital conversion circuit;

The analog-to-digital conversion circuit is used to convert the intermediate frequency analog signal into a digital signal and transmit the digital signal to the correlator;

The correlator is used to compare the wake-up sequence carried by the digital signal with the preset sequence and output a first matching result.
The circuit according to claim 5, characterized in that the first low-power receiving path further comprises: a low-noise amplifier, and the analog-to-digital conversion circuit is a comparator;

The low noise amplifier is used to amplify the intermediate frequency analog signal;

The comparator is used to convert the filtered and amplified intermediate frequency analog signal into the digital signal.
The circuit according to claim 5 or 6, characterized in that the number of the at least one low-power receiving path is multiple, and the circuit further comprises: a voting circuit;

The voting circuit is used to output the wake-up signal according to the first matching results output by the correlators of the plurality of low-power receiving paths.
The circuit according to claim 7 is characterized in that the voting circuit is an OR gate.
The circuit according to claim 7 is characterized in that the voting circuit is an AND gate.
The circuit according to any one of claims 1 to 9 is characterized in that the number of the at least one narrowband filter is plural, and the passband frequency of each narrowband filter is different.
The circuit according to claim 10, characterized in that the number of the at least one narrowband filter is two or three.
A receiver, characterized in that the receiver comprises a main receiving path and a low-power wake-up circuit as claimed in any one of claims 1 to 11.
The receiver according to claim 12, characterized in that the receiver further comprises: a switch;

The switch is respectively connected to the low-power wake-up circuit, the main receiving path and the antenna;

The switch is used to connect the antenna and the main receiving path when the low-power wake-up circuit outputs a wake-up signal.
The receiver according to claim 13 is characterized in that the switch is a single-pole double-throw switch, and a common end of the single-pole double-throw switch is connected to the antenna.
A wake-up sequence sending method, characterized in that it is applied to a first electronic device, the first electronic device is used to send a wake-up sequence to a second electronic device, the wake-up sequence is used to characterize the identity of the first electronic device, the second electronic device includes a low-power wake-up circuit, and the low-power wake-up circuit includes at least one narrowband filter;

The method comprises:

The first electronic device receives a connection instruction, where the connection instruction is used to instruct the first electronic device to establish a network connection with the second electronic device;

In response to the connection instruction, the first electronic device sends the wake-up sequence to the second electronic device at a plurality of frequencies in a preset frequency set respectively;

Among them, the multiple frequencies are frequencies within a first frequency range, the preset frequency set includes a first frequency and a second frequency, the first frequency and the second frequency differ by a preset bandwidth, the first frequency is any one of the multiple frequencies, the second frequency is different from the first frequency, and the first frequency range is the drift range of the passband frequency of the at least one narrowband filter within a preset temperature range.
The method according to claim 15 is characterized in that the preset bandwidth has a value range of 50KHz-1000KHz.
The method according to claim 16 is characterized in that the preset bandwidth is 120KHz and the number of multiple frequencies in the preset frequency set is 45.
An electronic device, characterized in that it comprises the low-power wake-up circuit as claimed in any one of claims 1 to 11, or comprises the receiver as claimed in any one of claims 12 to 14.
An electronic device, characterized in that it comprises: a processor, a memory and an interface;

The processor, the memory and the interface cooperate with each other so that the electronic device executes the method as claimed in any one of claims 15 to 17.
A computer-readable storage medium, characterized in that a computer program is stored in the computer-readable storage medium, and when the computer program is executed by a processor, the processor executes the method described in any one of claims 15 to 17.