CN112506577B - Wake-up system, near field communication device and wake-up method - Google Patents
Wake-up system, near field communication device and wake-up method Download PDFInfo
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- CN112506577B CN112506577B CN202110159693.9A CN202110159693A CN112506577B CN 112506577 B CN112506577 B CN 112506577B CN 202110159693 A CN202110159693 A CN 202110159693A CN 112506577 B CN112506577 B CN 112506577B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/44—Arrangements for executing specific programs
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
- H04W52/0245—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal according to signal strength
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The application discloses a wake-up system, a near field communication device and a wake-up method. The wake-up system comprises: a receiving circuit adapted to obtain an antenna sensing signal; and the detection circuit is suitable for providing a wake-up signal according to the amplitude and the carrier frequency of the antenna sensing signal, wherein in the low-power-consumption mode, when the amplitude of the antenna sensing signal is greater than or equal to a threshold value and the carrier frequency is consistent with a preset frequency, the wake-up signal is in an effective state, so that a rear-stage load circuit controlled by the wake-up signal is switched from the low-power-consumption mode to a working mode. The awakening system effectively reduces the probability of mistakenly awakening the rear-stage load circuit and ensures the awakening reliability.
Description
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a wake-up system, a near field communication device, and a wake-up method.
Background
With the development of wireless communication technology and the continuous improvement of living standard, mobile terminals such as smart phones have higher popularity and become an indispensable communication tool in daily life. Generally, in many electronic devices (e.g., mobile phones, tablet computers, wearable devices, etc.) using wireless communication technology, in order to extend the endurance time and reduce power consumption, a low power consumption mode is usually entered when the use is stopped, and when communication is required, a wake-up system wakes up a subsequent load circuit in the electronic device to perform communication.
In an existing communication system, a common wake-up method is: and the awakening system awakens the rear-stage load circuit to work according to the magnitude of the external field intensity amplitude. However, the external field strength is very susceptible to the surrounding environment (such as metal, wireless charging device, etc.), and when there are interference signals in the external environment, the amplitudes of several interference signals satisfy a certain condition, which will result in false wake-up of the subsequent load circuit.
Therefore, in order to solve the problem that the subsequent load circuit is mistakenly woken due to the interference signal, it is desirable to provide a further improved wake-up system to avoid the problem that the subsequent load circuit is mistakenly woken.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a wake-up system, a near field communication device and a wake-up method, so as to avoid the problem that a subsequent load circuit is mistakenly woken up.
According to an aspect of the present invention, there is provided a wake-up system, including: a receiving circuit adapted to obtain an antenna sensing signal; the detection circuit is suitable for providing a wake-up signal according to the amplitude and the carrier frequency of the antenna sensing signal, wherein in a low power consumption mode, when the amplitude of the antenna sensing signal is greater than or equal to a threshold value and the carrier frequency is consistent with a preset frequency, the wake-up signal is in an effective state, so that a rear-stage load circuit controlled by the wake-up signal is switched from the low power consumption mode to a working mode.
Optionally, the detection circuit includes: an amplitude detection circuit adapted to detect the amplitude of the antenna sensing signal and compare the amplitude with the threshold to obtain a first control signal; and the frequency detection circuit is suitable for detecting the carrier frequency of the antenna sensing signal and judging whether the carrier frequency is consistent with the preset frequency or not so as to obtain a second control signal, wherein when the first control signal and the second control signal are both in an effective state, the awakening signal is in an effective state.
Optionally, the frequency detection circuit provides the second control signal according to the first control signal and the carrier frequency, and outputs the second control signal to the rear-stage load circuit as the wake-up signal, wherein if the first control signal is in an active state, the frequency detection circuit is enabled, and if the first control signal is in an inactive state, the frequency detection circuit is disabled.
Optionally, the amplitude detection circuit is further adapted to update the state of the first control signal according to the second control signal, where when the second control signal changes from an invalid state to an valid state, the amplitude detection circuit adjusts the threshold to update the state of the first control signal, and when both the second control signal and the updated first control signal are in valid states, the wake-up signal is in a valid state.
Optionally, the detection circuit includes: the amplitude detection circuit is suitable for detecting the amplitude of the antenna induction signal and comparing a detection result with a reference voltage value to obtain a first control signal; and a secondary detection circuit connected to the amplitude detection circuit and turning on the secondary detection circuit when the first control signal is in an active state, the secondary detection circuit including: the clock recovery circuit is suitable for generating a clock signal according to the antenna sensing signal; a delay phase locked loop connected to the clock recovery circuit to generate a multi-phase clock from the clock signal; the frequency mixer is used for sampling the antenna induction signal by utilizing the multi-phase clock so as to obtain the amplitude of the antenna induction signal; and a comparator that compares the amplitude value with the threshold value to provide the wake-up signal, wherein the wake-up signal is in an active state when the comparator detects that the amplitude value is greater than/equal to the threshold value.
Optionally, before the wake-up signal is obtained, if the first control signal is in an active state, the first control signal turns on a power module of the rear-stage load circuit to pre-wake up the rear-stage load circuit.
According to a second aspect of the present invention, there is provided a near field communication device comprising: waking up the system as described above; and the rear-stage load circuit is connected to the wake-up system to receive the wake-up signal.
According to a third aspect of the present invention, there is provided a wake-up method, comprising: obtaining an antenna sensing signal; and providing a wake-up signal according to the amplitude and the carrier frequency of the antenna sensing signal, wherein in a low power consumption mode, when the amplitude of the antenna sensing signal is greater than or equal to a threshold value and the carrier frequency is consistent with a preset frequency, the wake-up signal is in an effective state so that a rear-stage load circuit controlled by the wake-up signal is switched from the low power consumption mode to a working mode.
Optionally, the method for providing the wake-up signal includes: detecting the amplitude of the antenna sensing signal and comparing the amplitude with the threshold value to obtain a first control signal; and detecting the carrier frequency of the antenna sensing signal and judging whether the carrier frequency is consistent with the preset frequency to obtain a second control signal,
when the first control signal and the second control signal are both in an active state, the wake-up signal is in an active state.
Optionally, the method for obtaining the second control signal includes: and providing the second control signal according to the first control signal and the carrier frequency, and outputting the second control signal to the rear-stage load circuit as the wake-up signal, wherein if the first control signal is in an effective state, the second control signal is provided, and if the first control signal is in an ineffective state, the second control signal is not provided.
Optionally, the method further includes: and updating the state of the first control signal according to the second control signal, wherein when the second control signal is changed from an invalid state to an valid state, the threshold value is adjusted to update the state of the first control signal, and when the second control signal and the updated first control signal are both in the valid state, the wake-up signal is in the valid state.
Optionally, the method for providing the wake-up signal includes: detecting the amplitude of the antenna induction signal, and comparing a detection result with a reference voltage value to obtain a first control signal; and when the first control signal is in an active state, executing the following steps: generating a clock signal according to the antenna sensing signal; generating a multi-phase clock according to the clock signal; sampling the antenna sensing signal by using the multi-phase clock to obtain the amplitude of the antenna sensing signal; and comparing the amplitude value with the threshold value to provide the wake-up signal, wherein the wake-up signal is in an active state when the amplitude value is detected to be greater than/equal to the threshold value.
Optionally, before the wake-up signal is obtained, if the first control signal is in an effective state, the power module of the rear-stage load circuit is turned on to pre-wake up the rear-stage load circuit.
According to the wake-up system, the near field communication device and the wake-up method, when the amplitude of the antenna sensing signal is larger than the threshold value and the frequency of the antenna sensing signal is consistent with the preset frequency, the wake-up signal is in an effective state, the probability that the rear-stage load circuit is mistakenly awakened is effectively reduced, and the wake-up reliability of the rear-stage load circuit is ensured.
Furthermore, the awakening system, the near field communication device and the awakening method carry out secondary detection on the amplitude of the antenna induction signal, the precision is higher during the secondary detection, and the risk that a rear-stage load circuit is awakened repeatedly can be effectively reduced; furthermore, the accuracy and the sensitivity of the second detection can be further improved by adopting a secondary carrier amplitude detection framework.
Furthermore, when the awakening system, the near field communication device and the awakening method detect that the amplitude of the antenna induction signal is larger than the threshold value, the awakening signal is in a ready state, and a corresponding power supply module in the chip can be started in advance, so that the awakening efficiency of a rear-stage load circuit is ensured while mistaken awakening is avoided.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:
fig. 1 shows a circuit schematic of an NFCC chip according to the prior art;
FIG. 2a shows a circuit schematic of a wake-up system according to a first embodiment of the invention;
FIG. 2b shows a circuit schematic of a wake-up system according to a second embodiment of the invention;
FIG. 2c shows a circuit schematic of a wake-up system according to a third embodiment of the invention;
FIG. 3 shows a schematic diagram of an amplitude detection circuit according to an embodiment of the invention;
FIG. 4a shows a flow chart of a wake-up method according to a first embodiment of the invention;
FIG. 4b shows a flow chart of a wake-up method according to a second embodiment of the invention;
fig. 4c shows a flowchart of a wake-up method according to a third embodiment of the invention.
List of reference numerals
100 chip
110. 210, 310, 410 receiving circuit
120 field intensity detection circuit
130 rear-stage load circuit
220. 320, 420 amplitude detection circuit
221. 321, 421 envelope detector
230. 330 frequency detection circuit
240. 340 logic circuit
430 secondary detection circuit
431 clock recovery circuit
432 phase locked loop
433 frequency mixer
434 comparator.
Detailed Description
The invention will be described in more detail below with reference to the accompanying drawings. Like elements in the various figures are denoted by like reference numerals. For purposes of clarity, the various features in the drawings are not drawn to scale. Moreover, certain well-known elements may not be shown in the figures.
In the following description, numerous specific details of the invention, such as structure, materials, dimensions, processing techniques and techniques of the devices are described in order to provide a more thorough understanding of the invention. However, as will be understood by those skilled in the art, the present invention may be practiced without these specific details.
It should be understood that, the connection/coupling of a and B in the embodiments of the present application means that a and B may be coupled in series or in parallel, or a and B may be coupled through other devices, which is not limited in the embodiments of the present application.
The wake-up system, the near field communication device and the wake-up method provided by the application can be applied to various communication systems using carrier communication, such as radar equipment, communication equipment, navigation equipment, satellite ground station, electronic countermeasure equipment and the like. The communication system is, for example but not limited to: near Field Communication (NFC) systems, global system for mobile Communication (GSM) systems, Universal Mobile Telecommunications System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX) Communication systems, Wireless Local Area Networks (WLANs), fifth-generation wireless Communication systems, and the like.
The wake-up system has the main function of switching the rear-stage load circuit from a low power consumption mode to a working mode, and the near field communication is a short-distance high-frequency radio technology and can perform identification and information exchange with compatible equipment within a short distance. As an example, when the wake-up system is applied in an NFC device, taking the working principle of an NFC controller (NFCC) chip 100 as an example, please refer to fig. 1, where the chip 100 includes a wake-up system and a post-stage load circuit 130, the wake-up system includes a receiving circuit 110 and a field strength detection circuit 120, the receiving circuit 110 includes a coil M 'and antenna ports AC 0' and AC1 ', the field strength detection circuit 120 includes an analog comparator COMP', and the field strength detection circuit 120 detects the voltage amplitudes of the antenna ports AC0 'and AC 1' and compares the voltage amplitudes with a reference voltage VREF' comparison, when the voltage amplitude of the antenna ports AC0 ', AC1 ' is larger than the reference voltage VREF' time, the field intensity detection circuit 120 outputs a control signal CTRL' directly awaken the subsequent load circuit 130 to operate. However, when there are interference signals in the external environment of the NFCC chip 100, and when there are magnetic fields in other frequency bands in the external environment of the NFCC chip and the field strength is higher than a certain range, the amplitudes of several interference signals are just larger than the reference voltage VREF', will result in false wake-up of the chip 100; in addition, when the chip 100 is awakened to operate, the chip 100 is switched from the low power consumption mode to the operating mode, and the load change of the chip 100 itself may cause the external field intensity change, which may also cause the problems of repeated awakening and the like.
The awakening system provided by the embodiment of the invention determines whether the awakening signal is effective or not by judging whether the amplitude and the carrier frequency of the antenna sensing signal meet the preset conditions or not, thereby effectively reducing the probability of mistakenly awakening the rear-stage load circuit and ensuring the awakening reliability of the rear-stage load circuit.
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples.
Fig. 2a shows a circuit schematic of a wake-up system according to a first embodiment of the invention. FIG. 3 shows a schematic diagram of an amplitude detection circuit according to an embodiment of the invention.
As shown in fig. 2a, the wake-up system provided in this embodiment includes a receiving circuit 210 and a detecting circuit, and in this embodiment, the detecting circuit includes an amplitude detecting circuit 220, a frequency detecting circuit 230, and optionally a logic circuit 240. The wake-up system is adapted to switch the operation state of the subsequent load circuit controlled by the wake-up signal, for example, when receiving the carrier signal, the wake-up system switches the subsequent load circuit in the sleep mode to the working mode.
The receiving circuit 210 is adapted to obtain an antenna induced signal, the receiving circuit 210 is for example in the form of a coil as shown in fig. 2, and comprises a coil M and antenna ports AC0, AC1, the coil M is adapted to receive and convert various information in the environment where the wake-up system is located, for example, including a carrier signal, an interference signal, etc. It should be understood that the receiving circuit 210 may also be other forms of receivers, signal processors, etc., which are not limited in this application.
The amplitude detection circuit 220 is connected to the receiving circuit 210 and adapted to detect an amplitude of the antenna sensing signal and compare the amplitude with a threshold value to obtain a first control signal C TRL1. In this embodiment, the amplitude detection circuit 220 includes an envelope detector 221 and an analog comparator COMP1, two input terminals of the envelope detector 221 are respectively connected to the antenna ports AC0 and AC1 via capacitors for demodulating the amplitude of the antenna sensing signal to obtain the amplitude of the antenna sensing signal, a non-inverting input terminal of the analog comparator COMP1 is connected to the output terminal of the envelope detector 221, and an inverting input terminal is connected to a reference voltage VREFWherein, the amplitude of the antenna induction signal is not more than the reference voltage VREFWhen the output end of the analog comparator COMP1 outputs the first control signal C of the invalid state TRL1; when the amplitude of the antenna induction signal is larger than the reference voltage VREFWhen the output end of the analog comparator COMP1 outputs a first control signal C of an active state TRL1, thereby the first control signal C TRL1, the amplitude of the antenna induction signal is greater than a threshold value, optionally by adjusting a reference voltage VREFTo adjust the threshold size. It will be appreciated that other forms may be usedAn amplitude detector replaces the envelope detector 221.
As an example, fig. 3 provides a schematic diagram of an amplitude detection circuit 220. As shown in FIG. 3, the antenna voltage AC0 is connected to the gate of the transistor M1 through the capacitor C0, and the bias voltage V is setBIASConnected to the gate of transistor M1 through resistor R. The envelope detection circuit comprises two current sources I, a transistor M1, a transistor M2, a capacitor C1 and a capacitor C2, wherein the current source I is connected with the first current source I1A transistor M1 connected in series between the power supply and the ground, a capacitor C1 connected in parallel between the source and the drain of the transistor M1, and a current source I2A transistor M2 connected in series between the power supply and the ground, a capacitor C2 connected in parallel between the source and the drain of the transistor M2, and a current source I1The series node with the transistor M1 provides the detection output voltage vp, and the current source I2The series node between the transistor M2 provides the detection output voltage vn, and the detection output voltage vp is compared with the detection output voltage vn by the comparator COMP1 when the peak-to-peak carrier amplitude vpp is>2*（VBIAS-VREF) Time-out of an active first control signal C TRL1 for use in a system.
The frequency detection circuit 230 is connected to the receiving circuit 210, and is adapted to detect a carrier frequency of the antenna sensing signal and determine whether the carrier frequency is consistent with a predetermined frequency to obtain a second control signal C TRL2. The input terminals of the frequency detection circuit 230 are connected to the antenna ports AC1, AC1, respectively, to receive the antenna sensing signal.
As an example, the frequency detection circuit 230 is a clock recovery circuit that generates a timing signal with a set frequency using an oscillator, samples the antenna sensing signal using the timing signal, determines whether the frequency of the antenna sensing signal is consistent with a predetermined frequency according to sampling data, adjusts the frequency of the timing signal according to the determination result until the frequency of the timing signal is consistent with the carrier frequency of the antenna sensing signal, and then compares the timing signal with the predetermined frequency to obtain the second control signal C TRL2, wherein the second control signal C TRL2 the effective state represents that the frequency of the antenna induction signal is consistent with the preset frequency when the antenna is inducedThe clock recovery circuit outputs a second control signal C in an active state when the frequency of the signal is identical to a predetermined frequency TRL2; when the frequency of the antenna induction signal is inconsistent with the preset frequency, the clock recovery circuit outputs a second control signal C in an invalid state TRL2. In alternative embodiments, the frequency detection circuit 230 may be other forms of clock frequency detection circuits.
Optionally, the control terminal of the frequency detection circuit 230 is connected to the output terminal of the amplitude detection circuit 220 and receives the first control signal C TRL1, the first control signal CTRLWhen 1 is in the active state, the frequency detection circuit 230 starts the frequency detection to reduce the power consumption of the circuit and improve the working efficiency. In this embodiment, the second control signal C may be directly appliedTRL2 as wake-up signal to the back-stage load circuit.
Optionally, the second control signal C is generatedTRLBefore 2, when the first control signal C TRL1 is in an active state, a first control signal C TRL1, starting a power supply module of the rear-stage load circuit to pre-awaken the rear-stage load circuit, so that the working efficiency of awakening the rear-stage load circuit can be further improved.
As another example, the detection circuit further comprises a logic circuit 240, said logic circuit 240 being adapted to be dependent on the first control signal C TRL1 and a second control signal C TRL2 providing a wake-up signal Cwakeup. In this embodiment, when the first control signal C is assertedTRL1 and a second control signal C TRL2 are all in an active state, i.e. when the amplitude of the antenna sensing signal is greater than the threshold and the frequency of the antenna sensing signal is consistent with the predetermined frequency, the wake-up signal CwakeupIs in an effective state, so that the wake-up signal C is determined by judging whether the amplitude and the frequency of the antenna induction signal meet the predetermined conditionswakeupWhether the circuit is effective or not effectively reduces the probability that the rear-stage load circuit is awoken by mistake and ensures the awakening reliability of the rear-stage load circuit.
Fig. 2b shows a circuit schematic of a wake-up system according to a second embodiment of the invention.
As shown in fig. 2b, the wake-up system provided by this embodiment comprises a receiving circuit 310 and a detecting circuit, wherein the detecting circuit comprises an amplitude detecting circuit 320, a frequency detecting circuit 330 and a logic circuit 340. The receiving circuit 310, the frequency detecting circuit 330 and the logic circuit 340 are respectively the same as the receiving circuit 210, the frequency detecting circuit 230 and the logic circuit 240 shown in fig. 2a, and are not repeated herein.
The difference is that the amplitude detection circuit 320 is further adapted to be dependent on the second control signal C TRL2 updating the first control signal C TRL1, specifically, the inverting input terminals of the analog comparator COMP1 are respectively connected to the first threshold voltage V th1 and a second threshold voltage V th2, and a first threshold voltage V th1 and a second threshold voltage V th2 is turned on by a second control signal CTRLAnd 2, controlling. Wherein, when the second control signal C TRL2 from the inactive state to the active state, the amplitude detection circuit 320 adjusts the threshold (i.e., by the first threshold voltage V)th1 to a second threshold voltage Vth2) To update the first control signal C TRL1, when the second control signal C TRL2 and the updated first control signal C TRL1 are all in the active state, wake-up signal CwakeupIs in an active state.
In the embodiment, since the secondary amplitude detection with higher precision is added in the amplitude detection circuit 320, only when the amplitude of the antenna induction signal is greater than the second threshold voltage VthAnd 2, when the frequency of the antenna induction signal is detected to be consistent with the preset frequency, the rear-stage load circuit is awakened to work finally, so that the risk that the rear-stage load circuit is awakened repeatedly is effectively reduced by secondary amplitude detection introduced by the awakening system of the embodiment, the field intensity is stable, and the awakening is more reliable.
Fig. 2c shows a circuit schematic of a wake-up system according to a third embodiment of the invention.
As shown in fig. 2c, the wake-up system provided in this embodiment includes a receiving circuit 410 and a detecting circuit, where the detecting circuit includes an amplitude detecting circuit 420 and a secondary detecting circuit 430, where the receiving circuit 410 and the amplitude detecting circuit 420 are respectively the same as the receiving circuit 210 and the amplitude detecting circuit 220 shown in fig. 2a, and are not described herein again.
The difference is that the secondary detection circuit 430 includes a clock recovery circuit 431, a delay locked loop 432, a mixer 433, and a comparator 434. The clock recovery circuit 431 is adapted to generate a clock signal CR of a predetermined frequency; the delay locked loop 432 is connected to the frequency detection circuit 431 to generate the multi-phase clock CK according to the recovered clock signal CR<N:0>(ii) a The mixer 433 is clocked by a multiphase clock CK<N:0>Sampling the antenna sensing signal to obtain the amplitude of the antenna sensing signal; the amplitude detection circuit 434 provides the wake-up signal C according to the amplitudewakeupWherein, when the first control signal C TRL1 is active, the secondary detection circuit 430 is enabled, and when the comparator detects an amplitude greater than/equal to the threshold, the wake-up signal is active.
In this embodiment, the amplitude of the antenna induction signal is detected to be higher than the reference voltage value V for the first timeREFThen, the secondary detection circuit 430 is turned on to perform secondary detection, which may be referred to as high-precision carrier amplitude detection, and the principle of the high-precision detection circuit is described as follows: clock signal CR recovered by antenna is passed through mixer circuit 433 to advance carrier amplitude and threshold voltage V th2 comparison, higher than threshold voltage V th2 output valid state wake-up signal CwakeupAnd waking up the rear-stage load circuit to work.
As shown in FIG. 2c, the clock recovery circuit 431 outputs a multi-phase clock CK through the delay locked loop 432 by comparing the antenna voltages and outputting a clock signal frequency CR (e.g., 13.56Mhz), which is 13.56M<N:0>The mixer 433 uses CK<N:0>The peak value sampling output of the antenna induction signal (for example, carrier signal) AC0 is realized and is matched with the threshold voltage V th2 to complete the secondary carrier amplitude detection. The circuit utilizes the information of the carrier frequency of the antenna, so that the circuit framework simultaneously realizes the detection function of the amplitude and the carrier frequency of the antenna sensing signal and outputs the wake-up signal CwakeupThe system can be reliably awakened to work.
Further, the present application also provides a near field communication device (not shown), which comprises a wake-up system as described in any of fig. 2a to 2c, for example, located in a controller chip of the near field communication device, and a subsequent load circuit, wherein the wake-up system is connected to the subsequent load circuit to switch an operation state of the subsequent load circuit. In this embodiment, the antenna sensing signal is a carrier signal, the predetermined frequency of the antenna sensing signal is 13.56Mhz, and when the amplitude of the carrier signal is greater than the threshold and the frequency is 13.56Mhz, the wake-up system sends a wake-up signal C in an active statewakeupSo that the load circuit of the later stage is switched from the low power consumption mode to the working mode.
Fig. 4a shows a flow chart of a wake-up method according to a first embodiment of the invention.
In step S101, information is received and converted into an antenna sensing signal.
In steps S102 to S105, a wake-up signal is provided according to the amplitude and the carrier frequency of the antenna sensing signal. In the low power consumption mode, when the amplitude of the antenna sensing signal is greater than or equal to the threshold and the carrier frequency is consistent with the preset frequency, the wake-up signal is in an effective state, so that a rear-stage load circuit controlled by the wake-up signal is switched from the low power consumption mode to the working mode.
Specifically, in step S102 and step S103, the amplitude of the antenna sensing signal is detected, and the amplitude is compared with a threshold value to obtain the first control signal. When the first control signal is valid, step S104 and step S105 are executed, and when the first control signal is invalid, step S102 is returned to, that is, the amplitude of the antenna sensing signal is continuously monitored.
In steps S104 and S105, a carrier frequency of the antenna sensing signal is detected, and whether the carrier frequency is consistent with a predetermined frequency is determined to obtain a second control signal, wherein when both the first control signal and the second control signal are in an active state, the wake-up signal is in the active state.
In this step, optionally, the method of obtaining the second control signal includes: and providing a second control signal according to the first control signal and the carrier frequency, and outputting the second control signal to a rear-stage load circuit as a wake-up signal, wherein if the first control signal is in an effective state, the second control signal is provided, and if the first control signal is in an ineffective state, the second control signal is not provided.
Optionally, after the step S103 is executed and before the step S104 is executed, if the first control signal is in an active state, the first control signal turns on a power supply module of the rear-stage load circuit to pre-wake up the rear-stage load circuit.
In step S106, a wake-up signal is provided according to the second control signal, or a wake-up signal is provided according to the first control signal and the second control signal. When the first control signal and the second control signal are both in an effective state, providing a wake-up signal in the effective state, namely when the amplitude of the antenna sensing signal is greater than the threshold value and the frequency of the antenna sensing signal is a predetermined frequency, the wake-up signal is in the effective state.
The wake-up method provided by the embodiment provides the wake-up signal by adopting the double-parameter detection, that is, the wake-up signal in the effective state is provided only when the amplitude and the frequency of the antenna sensing signal both meet the predetermined conditions, so that the probability of mistakenly waking up the rear-stage load circuit is effectively reduced, and the wake-up reliability of the rear-stage load circuit is ensured.
Fig. 4b shows a flow chart of a wake-up method according to a second embodiment of the invention. Steps S201 to S205 in the wake-up method are the same as steps S101 to S105 shown in fig. 4a, and are not repeated herein. If the frequency of the antenna sensing signal is detected to be the predetermined frequency in step S205, a second control signal in an active state is provided, and step S206 is executed.
In this embodiment, the state of the first control signal is updated according to the second control signal, specifically, when the second control signal changes from the inactive state to the active state, the threshold is adjusted to update the state of the first control signal, and when both the second control signal and the updated first control signal are in the active state, the wake-up signal is in the active state.
Specifically, in step S206, the amplitude of the antenna sensing signal is obtained. Unlike step S202, the step re-detects the amplitude of the antenna sensing signal to ensure the accuracy of the detection result. In step S207, it is determined whether the amplitude of the antenna sensing signal is greater than a second threshold voltage. In this step, the state of the first control signal is updated by adjusting the magnitude of the threshold value as compared to step S203.
In step S208, a wake-up signal is provided according to the first control signal and the second control signal. And when the second control signal and the updated first control signal are both in the effective state, the wake-up signal is in the effective state.
According to the awakening method, secondary amplitude detection with higher precision is added, and the rear-stage load circuit is awakened to work only when the amplitude of the antenna induction signal is larger than the second threshold voltage and the frequency of the antenna induction signal is detected to be the preset frequency, so that the risk that the rear-stage load circuit is awakened repeatedly is effectively reduced through the secondary amplitude detection introduced by the awakening method, the field intensity is stable, and awakening is more reliable.
Fig. 4c shows a flowchart of a wake-up method according to a third embodiment of the invention. Steps S301 to S303 in the wake-up method are the same as steps S101 to S103 shown in fig. 4a, and are not described herein again. If it is detected in step S303 that the amplitude of the antenna sensing signal is greater than the reference voltage value, a first control signal in an active state is provided, and step S304 is executed.
In step S304, the frequency of the antenna sensing signal is obtained, and the amplitude is sampled. Specifically, a clock signal is generated according to the antenna sensing signal; generating a multi-phase clock according to the clock signal; sampling the antenna induction signal by using a multi-phase clock to obtain the amplitude of the antenna induction signal; and comparing the amplitude value with a threshold value to provide a wake-up signal, wherein the wake-up signal is in an active state when the amplitude value is detected to be greater than/equal to the threshold value.
In step S305, it is determined whether the amplitude of the antenna sensing signal is greater than a threshold value, i.e., a second control signal is provided according to the sampled amplitude. When the amplitude of the antenna sensing signal is larger than the threshold value, the second control signal is in an effective state, and therefore the awakening signal is in an effective state.
In step S306, if the amplitude of the antenna sensing signal is greater than the threshold, a wake-up signal in an active state is provided. In this step, the fact that the amplitude of the antenna sensing signal is greater than the threshold value indicates that the amplitude of the antenna sensing signal is greater than the threshold value and the frequency of the antenna sensing signal is consistent with the predetermined frequency.
The awakening method of the embodiment simultaneously realizes the detection of the amplitude and the frequency of the antenna induction signal, so that the output awakening signal can reliably awaken the system to work.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
While embodiments in accordance with the invention have been described above, these embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments described. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated. The invention is limited only by the claims and their full scope and equivalents.
Claims (11)
1. A wake-up system, comprising:
a receiving circuit adapted to obtain an antenna sensing signal;
the amplitude detection circuit comprises an envelope detector and a first control signal generation circuit, wherein the envelope detector is used for demodulating the amplitude of the antenna sensing signal to obtain the amplitude of the antenna sensing signal, and the amplitude detection circuit provides a first control signal in an effective state under the condition that the amplitude of the antenna sensing signal is larger than a threshold value; and
a frequency detection circuit or secondary detection circuit, connected to the amplitude detection circuit, adapted to detect the carrier frequency of the antenna induced signal to provide a wake-up signal if the first control signal is active,
in the low power consumption mode, when the carrier frequency is consistent with a preset frequency, the wake-up signal is in an effective state, so that a rear-stage load circuit controlled by the wake-up signal is switched from the low power consumption mode to a working mode.
2. Wake-up system according to claim 1,
the frequency detection circuit provides a second control signal according to the first control signal and the carrier frequency, and outputs the second control signal to the post-stage load circuit as the wake-up signal,
if the first control signal is in an active state, the frequency detection circuit is enabled, and if the first control signal is in an inactive state, the frequency detection circuit is disabled.
3. Wake-up system according to claim 2,
the amplitude detection circuit is further adapted to update the state of the first control signal in dependence on the second control signal,
wherein the amplitude detection circuit adjusts the threshold to update the state of the first control signal when the second control signal changes from an inactive state to an active state,
and when the second control signal and the updated first control signal are both in an effective state, the wake-up signal is in an effective state.
4. The wake-up system according to claim 1, wherein the secondary detection circuit comprises:
the clock recovery circuit is suitable for generating a clock signal according to the antenna sensing signal;
a delay phase locked loop connected to the clock recovery circuit to generate a multi-phase clock from the clock signal;
a mixer for sampling the antenna sensing signal by using the multi-phase clock to obtain the amplitude of the antenna sensing signal; and
a comparator to compare the amplitude with the threshold to provide the wake-up signal,
wherein the wake-up signal is in an active state when the comparator detects that the amplitude is greater than/equal to the threshold.
5. The wake-up system according to any one of claims 1 to 4, wherein before the wake-up signal is obtained, if the first control signal is in an active state, the first control signal turns on a power module of the rear-stage load circuit to pre-wake up the rear-stage load circuit.
6. A near field communication device, comprising:
wake-up system according to any of the claims 1 to 5; and
and the rear-stage load circuit is connected to the wake-up system to receive the wake-up signal.
7. A method of waking up, comprising:
obtaining an antenna sensing signal;
demodulating the amplitude of the antenna sensing signal by using an envelope detector to obtain the amplitude of the antenna sensing signal, and providing a first control signal in an effective state under the condition that the amplitude of the antenna sensing signal is greater than a threshold value; and
detecting a carrier frequency of the antenna sensing signal to provide a wake-up signal if the first control signal is active,
in the low power consumption mode, when the carrier frequency is consistent with a preset frequency, the wake-up signal is in an effective state, so that a rear-stage load circuit controlled by the wake-up signal is switched from the low power consumption mode to a working mode.
8. Wake-up method according to claim 7, characterized in that the method of obtaining a second control signal comprises:
providing the second control signal according to the first control signal and the carrier frequency, and outputting the second control signal to the post-stage load circuit as the wake-up signal,
and if the first control signal is in an effective state, providing the second control signal, and if the first control signal is in an ineffective state, not providing the second control signal.
9. The wake-up method according to claim 8, further comprising:
updating the state of the first control signal according to the second control signal,
wherein the threshold is adjusted to update the state of the first control signal when the second control signal changes from the inactive state to the active state,
and when the second control signal and the updated first control signal are both in an effective state, the wake-up signal is in an effective state.
10. Wake-up method according to claim 7, characterized in that the method of providing a wake-up signal comprises:
when the first control signal is in an effective state, executing the following steps:
generating a clock signal according to the antenna sensing signal;
generating a multi-phase clock according to the clock signal;
sampling the antenna sensing signal by using the multi-phase clock to obtain the amplitude of the antenna sensing signal; and
comparing the amplitude value with the threshold value to provide the wake-up signal,
wherein the wake-up signal is in an active state when it is detected that the amplitude is greater than/equal to the threshold.
11. The wake-up method according to any one of claims 7 to 10, wherein before obtaining the wake-up signal, if the first control signal is in an active state, a power module of the subsequent load circuit is turned on to pre-wake up the subsequent load circuit.
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| CN103093508A (en) * | 2011-11-07 | 2013-05-08 | 中国科学院电子学研究所 | Two-stage wake-up circuit applicable to electronic toll collection system |
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| US20050237160A1 (en) * | 2004-04-23 | 2005-10-27 | Microchip Technology Incorporated | Reducing false wake-up in a low frequency transponder |
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| CN103093508A (en) * | 2011-11-07 | 2013-05-08 | 中国科学院电子学研究所 | Two-stage wake-up circuit applicable to electronic toll collection system |
| CN108023603A (en) * | 2016-10-28 | 2018-05-11 | 三星电子株式会社 | The operating method of NFC receivers and circuit including NFC receivers |
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