CN115276845A

CN115276845A - Power detection circuit, driving method, printed circuit board and terminal equipment

Info

Publication number: CN115276845A
Application number: CN202110485197.2A
Authority: CN
Inventors: 刘伟; 王孝义; 翟巍; 李振霄
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2021-04-30
Filing date: 2021-04-30
Publication date: 2022-11-01

Abstract

The embodiment of the application provides a power detection circuit, a driving method, a printed circuit board and terminal equipment, relates to the technical field of wireless radio frequency, and is used for solving the problem that the number of radio frequency test seats on the printed circuit board is large. A power detection circuit comprising: the first port of the first radio frequency channel and the first port of the first coupling channel of the first radio frequency module are coupled with a first connecting end, and the first connecting end is also coupled with a plurality of test points. The first ports of the plurality of second rf channels of the second rf module are coupled to each of the second connection terminals. The radio frequency test sockets are correspondingly coupled with the second connecting ends. The test receiver is used to measure the power of the first coupled channel. The first multi-pole multi-throw switch is characterized in that a plurality of first movable ends are correspondingly coupled with the second ports of the first radio frequency channels, the second ports of the first coupling channels and the second ports of the second radio frequency channels, and a plurality of first fixed ends are correspondingly coupled with the second ports of the second radio frequency channels and the test receiver.

Description

Power detection circuit, driving method, printed circuit board and terminal equipment

Technical Field

The application relates to the technical field of wireless radio frequency, in particular to a power detection circuit, a driving method, a printed circuit board and terminal equipment.

Background

With the rapid development of terminal technology, terminal devices are becoming more and more popular and becoming indispensable devices in people's life. People can learn, entertain and the like through the terminal equipment. Before the terminal device leaves the factory, radio frequency testing is required to detect whether the radio frequency performance of the terminal device meets the requirements. The radio frequency performance of the terminal equipment can be sold to users for use only when meeting the requirements.

Currently, a Printed Circuit Board (PCB) in a terminal device is installed with a radio frequency test socket, and a test device tests the radio frequency performance of the terminal device through the radio frequency test socket. However, with the popularization of 4G and 5G communication technologies, more and more radio frequency channels are provided in the terminal equipment, resulting in an increase in the number of radio frequency test sockets for radio frequency channel calibration tests. For example, the number of rf test sockets in some terminal devices may be more than ten. However, the radio frequency test sockets have a large occupied area and a high price, and most of the radio frequency test sockets are only used for calibration tests, so that the products do not play any role after being sold to users. Therefore, the presence of the rf test socket increases the area of the PCB to some extent, increasing the cost of the product.

Disclosure of Invention

The embodiment of the application provides a power detection circuit, a driving method, a printed circuit board and terminal equipment, and is used for solving the problem that the number of radio frequency test seats on the printed circuit board is large.

In order to achieve the purpose, the following technical scheme is adopted in the application:

in a first aspect of embodiments of the present application, a power detection circuit is provided, including: the first radio frequency module comprises a plurality of first radio frequency channels, a first coupling channel and a first connecting end; the first port of the first radio frequency channel and the first port of the first coupling channel are coupled with a first connecting end, and the first connecting end is also coupled with a plurality of test points; the second radio frequency module comprises a plurality of second radio frequency channels and a plurality of second connecting ends; the first ports of the plurality of second radio frequency channels are coupled with each second connection end; the radio frequency test seats are correspondingly coupled with the second connecting ends; the test receiver is used for measuring the power of the first coupling channel; a first multi-pole multi-throw switch comprising a plurality of first moving terminals and a plurality of first stationary terminals; the plurality of first movable terminals are correspondingly coupled with the second ports of the plurality of first radio frequency channels, the second port of the first coupling channel and the second ports of the plurality of second radio frequency channels, and the plurality of first fixed terminals are correspondingly coupled with the second ports of the plurality of second radio frequency channels and the test receiver.

In the embodiment of the application, the radio frequency test seat coupled with the first radio frequency module is omitted, and a channel in the first radio frequency module and a channel in the second radio frequency module form a passage. And completing the calibration test of the channel in the first radio frequency module by using the test capability of the test receiver and the radio frequency test seat coupled with the second radio frequency module. That is to say, the power detection circuit provided in the embodiment of the present application, although the radio frequency test socket corresponding to the first radio frequency module is omitted, can still perform the calibration test on the radio frequency channel in the first radio frequency module. Therefore, compared with the related art, the power detection circuit provided by the embodiment of the application can delete part of the radio frequency test seats, save the PCB layout area, improve the utilization rate of the PCB of the terminal equipment, simultaneously can not cover the radio frequency problem of certain channels, and can not sacrifice the power precision performance of certain channels. Therefore, the power detection circuit provided by the embodiment of the application can meet the requirement that when the PCB layout area of the terminal equipment is short, the occupied area of the device needs to be reduced under the condition that the functional device is not deleted and the performances such as radio frequency and the like are not lost.

Optionally, the first rf module is a low frequency rf module relative to the second rf module. Therefore, the radio frequency module not correspondingly provided with the radio frequency test seat needs to be calibrated through the radio frequency module correspondingly provided with the radio frequency test seat, the low-frequency-band signal can pass through the high-frequency-band radio frequency module, but the high-frequency-band signal passes through the low-frequency-band radio frequency module, and the requirement on the performance of components in the low-frequency-band radio frequency module is high. Therefore, the second radio frequency module is correspondingly provided with the radio frequency test seat, and the second radio frequency module is limited to the medium-high frequency band radio frequency module, so that the problem that the medium-high frequency band signal cannot pass through the second single-pole multi-throw switch and cannot finish the calibration of the radio frequency channel in the second radio frequency module due to the fact that the performance of the second single-pole multi-throw switch in the first radio frequency module cannot meet the requirement can be avoided, and the requirement for the second single-pole multi-throw switch is lowered.

Optionally, the power detection circuit further includes a first single-pole multi-throw switch; the first single-pole multi-throw switch comprises a plurality of second movable ends and second immovable ends, the second immovable ends are coupled with the first connecting ends, and the plurality of second movable ends are correspondingly coupled with the plurality of test points. In this way, the first rf module may only include one first connection end, so as to simplify the port structure of the first rf module.

Optionally, the first rf module includes a first coupler, a second single-pole multi-throw switch, and a plurality of first power amplifiers; the first coupler is coupled with the first connecting end and the first movable end to form a first coupling channel; the third fixed end of the second single-pole multi-throw switch is coupled with the first connecting end, and a plurality of third movable ends of the second single-pole multi-throw switch are coupled with the first power amplifiers and the first movable ends to form a plurality of first radio frequency channels.

Optionally, the second rf module includes a second multi-pole multi-throw switch and a plurality of second power amplifiers; and a plurality of fourth fixed ends of the second multi-pole multi-throw switch are correspondingly coupled with the plurality of second connecting ends, and a plurality of fourth movable ends of the second multi-pole multi-throw switch are coupled with the plurality of second power amplifiers and the first fixed end to form a plurality of second radio frequency channels.

Optionally, the second rf module further includes a plurality of second couplers and a third single-pole multi-throw switch; the plurality of second couplers are correspondingly coupled with the plurality of second connecting ends and are also correspondingly coupled with the plurality of fifth moving ends of the third single-pole multi-throw switch; the first multi-pole multi-throw switch also includes a first moving terminal that is separately coupled to the fifth stationary terminal of the third single-pole multi-throw switch.

Optionally, the power detection circuit further includes a detection auxiliary module, which is coupled to the test point and the load, and is configured to connect the load to the test point.

Optionally, the detection auxiliary module includes an inductor, a capacitor and an antenna spring; one end of the inductor is coupled with the test point, and the other end of the inductor is coupled with the reference ground; one end of the capacitor is coupled with the test point, and the other end of the capacitor is coupled with the antenna spring; the antenna dome is used for being coupled with a load.

Optionally, the power detection circuit further includes a radio frequency integrated circuit, and the test receiver is integrated in the radio frequency integrated circuit.

In a second aspect of the embodiments of the present application, there is provided a printed circuit board, including: a circuit board body and the power detection circuit of any one of the first aspect; the power detection circuit is arranged on the circuit board body.

The printed circuit board provided by the embodiment of the application comprises the power detection circuit of any one of the first aspect, and the beneficial effects of the power detection circuit are the same as those of the power detection circuit, and are not repeated herein.

In a third aspect of the embodiments of the present application, a terminal device is provided, which includes: the printed circuit board and plurality of antennas of claim 10; the plurality of test points and the plurality of radio frequency test sockets of the power detection circuit in the printed circuit board are each coupled to a different antenna.

The terminal device provided in the embodiment of the present application includes the power detection circuit of any one of the first aspect, and its beneficial effects are the same as those of the power detection circuit, and are not described herein again.

In a fourth aspect of the embodiments of the present application, a method for driving a power detection circuit is provided, where the power detection circuit includes a first radio frequency module, a second radio frequency module, a plurality of radio frequency test sockets, a test receiver, and a first multi-pole multi-throw switch; the first radio frequency module comprises a plurality of first radio frequency channels, a first coupling channel and a first connecting end; the second radio frequency module comprises a plurality of second radio frequency channels and a plurality of second connecting ends; a method of driving a power detection circuit, comprising: the radio frequency test base receives a first test power signal P1, the first test power signal P1 is transmitted to a first radio frequency channel through a second radio frequency channel and a first multi-pole multi-throw switch, and a first receiving signal W1 of a test point is detected; acquiring a difference X1 between a first receiving signal W1 and a first test power signal P1; the radio frequency test seat receives a second test power signal P2, the second test power signal P2 passes through a second radio frequency channel and a first multi-pole multi-throw switch to reach a first radio frequency channel, then passes through a first coupling channel and the first multi-pole multi-throw switch to reach a test receiver, a second receiving signal W2 of the test receiver is detected, and the mapping relation between the test power signal P and the second receiving signal W2 of the test point is established; wherein P = P2-X1; the radio frequency test base repeatedly receives different second test power signals P2, and a mapping relation table of the test power signals P and the second receiving signals W2 is established; a preset power signal P3 in the first radio frequency channel is transmitted to the test receiver through the first coupling channel, a third receiving signal W3 of the test receiver is detected, and a mapping relation between the preset power signal P3 and the third receiving signal W3 is established; different preset power signals P3 repeatedly pass through the first coupling channel to the test receiver, and a mapping relation table of the preset power signals P3 and the third receiving signal W3 is established; and establishing a mapping relation table of the test power signal P and the preset power signal P3 according to the mapping relation table of the test power signal P and the second receiving signal W2 and the mapping relation table of the preset power signal P3 and the third receiving signal W3.

The advantageous effects of the driving method of the power detection circuit provided in the fourth aspect are the same as the advantageous effects of the power detection circuit provided in the first aspect, and are not described herein again.

In a fifth aspect of the embodiments of the present application, a method for driving a power detection circuit is provided, where the power detection circuit includes a first radio frequency module, a second radio frequency module, a plurality of radio frequency test sockets, a test receiver, and a first multi-pole multi-throw switch; the first radio frequency module comprises a plurality of first radio frequency channels, a first coupling channel and a first connecting end; the second radio frequency module comprises a plurality of second radio frequency channels, a second coupling channel and a plurality of second connecting ends; a method of driving a power detection circuit, comprising: the radio frequency test base receives a first test power signal P1, the first test power signal P1 is transmitted to a first radio frequency channel through a second radio frequency channel and a first multi-pole multi-throw switch, and a first receiving signal W1 of a test point is detected; acquiring a difference X1 between a first receiving signal W1 and a first test power signal P1; the radio frequency test seat receives a second test power signal P2, the second test power signal P2 passes through a second radio frequency channel and a first multi-pole multi-throw switch to reach a first radio frequency channel, then passes through a first coupling channel and the first multi-pole multi-throw switch to reach a test receiver, a second receiving signal W2 of the test receiver is detected, and the mapping relation between the test power signal P and the second receiving signal W2 of the test point is established; wherein P = P2-X1; a preset power signal P3 in the first radio frequency channel is transmitted to the test receiver through the first coupling channel, a third receiving signal W3 of the test receiver is detected, and a mapping relation between the preset power signal P3 and the third receiving signal W3 is established; establishing a mapping relation between the test power signal P and a preset power signal P3 according to the mapping relation between the test power signal P and the second receiving signal W2 and the mapping relation between the preset power signal P3 and the third receiving signal W3; the same preset power signal P3 in the first radio frequency channel is transmitted to the second radio frequency channel through the first coupling channel and the first multi-pole multi-throw switch, and a fourth receiving signal W4 of the radio frequency test seat is detected; acquiring a difference X2 between the fourth received signal W4 and the test power signal P; and repeatedly passing different preset power signals P3 in the first radio frequency channel to the second radio frequency channel through the first coupling channel and the first multi-pole multi-throw switch, detecting a fifth receiving signal W5 of the radio frequency test seat, and establishing a mapping relation table between the preset power signals P3 and the test power signals P, wherein P = W5-X2. In the driving method of the power detection circuit, in the detection process, only a certain value in the dynamic range of the test receiver is required to be taken until the third receiving signal of the test receiver is detected once, and the value is not required to be taken for many times. Therefore, there is a lower requirement for the dynamic range and power accuracy within the dynamic range of the test receiver.

Drawings

Fig. 1 is a schematic structural diagram of a terminal device according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of a power detection circuit according to an embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of another power detection circuit provided in an embodiment of the present application;

fig. 4 is a schematic diagram illustrating a coupling between a power detection circuit and an antenna according to an embodiment of the present disclosure;

fig. 5A is a schematic structural diagram of another power detection circuit according to an embodiment of the present disclosure;

fig. 5B is a schematic diagram illustrating a coupling between a detection assistant module and a load according to an embodiment of the present disclosure;

fig. 6 is a schematic diagram illustrating a driving process of a power detection circuit according to an embodiment of the present disclosure;

fig. 7 is a schematic diagram of a driving process of another power detection circuit according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments.

Hereinafter, the terms "second", "first", and the like are used for descriptive convenience only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "second," "first," etc. may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.

In addition, in the embodiments of the present application, the directional terms "upper", "lower", "left", "right", etc. may include, but are not limited to, being defined relative to the schematically-placed orientation of the components in the drawings, it being understood that these directional terms may be relative concepts that are used for descriptive and clarity purposes relative to the components, and that they may vary accordingly depending on the orientation of the components in the drawings.

In the present application, unless expressly stated or limited otherwise, the term "coupled" is to be construed broadly, e.g., "coupled" may be a fixed connection, a removable connection, or an integral part; may be directly connected or indirectly connected through an intermediate. In addition, the term "electrically connected" may be directly electrically connected or indirectly electrically connected through an intermediate.

Also, in the embodiments of the present application, words such as "exemplary" or "for example" are used to mean serving as examples, illustrations or illustrations. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present relevant concepts in a concrete fashion for ease of understanding.

The embodiment of the application provides a terminal device, which can be a device for realizing a wireless communication function. Such as a terminal or a chip usable in a terminal, etc. The terminal may be a User Equipment (UE), an access terminal, a terminal unit, a terminal station, a mobile station, a remote terminal, a mobile device, a wireless communication device, a terminal agent or a terminal device in a 5G network or a Public Land Mobile Network (PLMN) of future evolution. The access terminal may be a mobile phone, a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device or a wearable device, a Virtual Reality (VR) terminal device, an Augmented Reality (AR) terminal device, a wireless terminal in industrial control (industrial control), a wireless terminal in unmanned drive (self drive), a wireless terminal in remote medical (remote medical), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation security (transit), a wireless terminal in city (smart city), a wireless terminal in home, etc. The terminal may be mobile or stationary.

Hereinafter, a schematic description will be given by taking a terminal device as a mobile phone as an example. As shown in fig. 1, the terminal device 100 includes components such as a radio frequency unit 101, a network module 102, an audio output unit 103, an input unit 104, a sensor 105, a display unit 106, a user input unit 107, an interface unit 108, a memory 109, a processor 110, and a power supply 111.

Those skilled in the art will appreciate that the configuration of the terminal device 100 shown in fig. 1 does not constitute a limitation of the terminal device 100, and that the terminal device 100 may include more or less components than those shown, or combine some components, or a different arrangement of components.

The rf unit 101 may be used for receiving and transmitting information or receiving and transmitting signals during a call. Illustratively, the downlink data from the base station is received and then processed by the processor 110. In addition, the uplink data is transmitted to the base station. In addition, the radio frequency unit 101 can also communicate with a network and other devices through a wireless communication system.

For example, the radio frequency unit 101 may be one of a WiFi unit, a global system for mobile communication (GSM) unit and a Wideband Code Division Multiple Access (WCDMA) unit, or may be another radio frequency unit, and the embodiment of the present invention is not limited thereto.

The terminal device provides wireless broadband internet access to the user through the network module 102, such as helping the user send and receive e-mails, browse webpages, access streaming media, and the like.

The audio output unit 103 may convert audio data received by the radio frequency unit 101 or the network module 102 or stored in the memory 109 into an audio signal and output as sound. Also, the audio output unit 103 may also provide audio output related to a specific function performed by the terminal device 100 (e.g., a call signal reception sound, a message reception sound, etc.). The audio output unit 103 may include, for example, a speaker, a buzzer, a receiver, and the like.

The input unit 104 is used to receive an audio or video signal. The input unit 104 may include a Graphics Processing Unit (GPU) 1041 and a microphone 1042.

The graphic processor 1041 processes image data of still pictures or video obtained by an image capturing apparatus (e.g., a camera) in a video capturing mode or an image capturing mode. The processed image frames may be displayed on the display unit 106. The image frames processed by the graphic processor 1041 may be stored in the memory 109 (or other storage medium) or transmitted via the radio frequency unit 101 or the network module 102.

The microphone 1042 may receive sound and may be capable of processing such sound into audio data. The processed audio data may be converted into a format output transmittable to a mobile communication base station via the radio frequency unit 101 in case of the phone call mode.

The terminal device 100 further comprises at least one sensor 105, such as a light sensor, a motion sensor or other sensors.

Illustratively, the light sensor includes an ambient light sensor and a proximity sensor. The ambient light sensor may adjust the brightness of the display 1061 according to the brightness of the ambient light, and the proximity sensor may turn off the display 1061 and/or the backlight when the terminal device 100 moves to the ear.

Illustratively, the motion sensor includes an accelerometer sensor. The accelerometer sensor can detect the magnitude of acceleration in each direction (generally three axes), can detect the magnitude and direction of gravity when the accelerometer sensor is stationary, and can be used for identifying the attitude of the terminal device (such as horizontal and vertical screen switching, related games and magnetometer attitude calibration) or identifying related functions (such as pedometer and tapping) by vibration.

The sensors 105 may also include fingerprint sensors, pressure sensors, iris sensors, molecular sensors, gyroscopes, barometers, hygrometers, thermometers, infrared sensors, and the like.

The display unit 106 is used to display information input by a user or information provided to the user. The display unit 106 may include a display screen 1061, and the display screen 1061 may be a Liquid Crystal Display (LCD) screen, an organic light-emitting diode (OLED) display screen, or the like.

The user input unit 107 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function control of the terminal device 100. Illustratively, the user input unit 107 includes a touch panel 1071 and other input devices 1072.

Touch panel 1071, also referred to as a touch screen, may collect touch operations by a user on or near the touch panel 1071 (e.g., operations by a user on or near touch panel 1071 using a finger, stylus, or any suitable object or attachment). The touch panel 1071 may include two parts of a touch detection device and a touch controller. The touch detection device detects the touch direction of a user, detects a signal brought by touch operation, and transmits the signal to the touch controller. The touch controller receives touch information from the touch sensing device, converts the touch information into touch point coordinates, sends the touch point coordinates to the processor 110, receives a command from the processor 110, and executes the command. The touch panel 1071 may be implemented by various types such as a resistive type, a capacitive type, an infrared ray, and a surface acoustic wave.

The user input unit 107 may include other input devices 1072 in addition to the touch panel 1071. By way of example, other input devices 1072 may include, but are not limited to, a physical keyboard, function keys (e.g., volume control keys, switch keys, etc.), a trackball, a mouse, a joystick, and the like.

The touch panel 1071 may be overlaid on the display 1061, and when the touch panel 1071 detects a touch operation thereon or nearby, the touch panel is transmitted to the processor 110 to determine the type of the touch event, and then the processor 110 provides a corresponding visual output on the display 1061 according to the type of the touch event. Although in fig. 1, touch panel 1071 and display 1061 are shown as two separate components to implement the input and output functions of terminal device 100, in some embodiments, touch panel 1071 may be integrated with display 1061 to implement the input and output functions of terminal device 100.

The interface unit 108 is an interface for connecting an external device to the terminal apparatus 100. For example, the external device may include a wired or wireless headset port, an external power supply (or battery charger) port, a wired or wireless data port, a memory card port, a port for connecting a device having an identification module, an audio input/output (I/O) port, a video I/O port, an earphone port, and the like. The interface unit 108 may be used to receive input (e.g., data information, power, etc.) from an external device and transmit the received input to one or more elements within the terminal apparatus 100 or may be used to transmit data between the terminal apparatus 100 and the external device.

The memory 109 may be used to store software programs as well as various data. The memory 109 may mainly include a program storage area and a data storage area. The storage program area may store an operating system, an application program (such as a sound playing function, an image playing function, and the like) required by at least one function, and the like. The storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, etc.

The memory 109 may be, for example, a read-only memory (ROM) or other type of static storage device that may store static information and instructions, a Random Access Memory (RAM) or other type of dynamic storage device that may store information and instructions, an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compact disc, laser disc, optical disc, digital versatile disc, blu-ray disc, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to this. The memory 109 may be separate and coupled to the processor 110 via a communication link. Memory 109 may also be integrated with processor 110.

The memory 109 is used for storing computer-executable instructions for executing the present application, and is controlled by the processor 110 to execute.

The computer-executable instructions in the embodiments of the present application may also be referred to as application program codes, which are not specifically limited in the embodiments of the present application.

Further, the memory 109 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device.

The processor 110 is a control center of the terminal device, connects various parts of the entire terminal device by using various interfaces and lines, performs various functions of the terminal device and processes data by running or executing software programs and/or modules stored in the memory 109 and calling data stored in the memory 109, thereby integrally monitoring the terminal device. Processor 110 may include one or more processing units. For example, the processor 110 may integrate an application processor and a modem processor. The application processor mainly processes an operating system, a user interface, an application program and the like. The modem processor handles primarily wireless communications. It will be appreciated that the modem processor described above may not be integrated into the processor 110.

Terminal device 100 may also include a power source 111 (such as a battery) to power the various components. For example, the power supply 111 may be logically connected to the processor 110 through a power management system, so as to implement functions of managing charging, discharging, and power consumption through the power management system.

The radio frequency unit 101 includes a radio frequency module, and a radio frequency channel in the radio frequency module needs to be calibrated and tested before the terminal device 100 leaves a factory. In this regard, the terminal device 100 includes a power detection circuit therein for performing a calibration test on the radio frequency channel.

The embodiment of the present application provides a Printed Circuit Board (PCB), which includes a circuit board body, and the power detection circuit can be integrated on the circuit board body. In addition, the processor 110 in the terminal device 100 may also be integrated on the circuit board body.

In some embodiments, the printed circuit board may be a motherboard of the terminal device 100.

In order to implement calibration test on a radio frequency channel in a radio frequency module, an embodiment of the present application provides a power detection circuit, as shown in fig. 2, the power detection circuit includes:

a first rf module 20 including a first coupling channel 21 and a first connection end 20a; the first port of the first coupling channel 21 is coupled with the first connection terminal 20 a.

A second rf module 30, including a second coupling channel 31 and a plurality of second connecting terminals 30a; a first port of the second coupling channel 31 is coupled to each second connection terminal 30a.

The plurality of rf test sockets 40 are correspondingly coupled to the rf test sockets 40 respectively at the first connection end 20a and each of the second connection ends 30a of the plurality of second connection ends 30a.

A test receiver 50 for measuring the power of the first coupling path 21 and the second coupling path 31.

The single pole, multiple throw switch 60 includes a plurality of moving terminals 60a and stationary terminals 60b. The plurality of moving terminals 60a of the single-pole multi-throw switch 60 are coupled to the second port of the first coupling channel 21 and the second port of the second coupling channel 31, and the stationary terminal 60b of the single-pole multi-throw switch 60 is coupled to a test receiver (MRx) 50.

Fig. 2 shows that the structures of the first rf module 20 and the second rf module 30 are only schematic, and fig. 2 takes the example that the main diversity of the first rf module 20 and the main diversity of the second rf module 30 have 4 rf channels, each rf channel needs to be provided with an rf test socket 40 correspondingly, and 4 rf test sockets 40 are needed for detection.

However, since the rf test socket 40 only performs calibration test on the rf channel connected thereto, the test socket no longer performs the test function after completing the factory calibration and only performs the signal connection function, the function is equivalent to the signal routing in the circuit board body, and the rf test socket 40 has a large occupied area and a high price. Therefore, the presence of the rf test socket 40 increases the PCB area to some extent, increasing the cost of the product. Therefore, some products may omit the rf test sockets 40 corresponding to the diversity or main set, and the occupied area and cost of the rf test sockets 40 may be reduced by reducing the number of the rf test sockets 40. However, since the partial diversity or the main set is not provided with the rf test socket 40, the rf test socket 40 included in the power detection circuit only acts on one rf channel, so that the rf channel not provided with the rf test socket 40 does not undergo a calibration test before leaving the factory, and the power accuracy of the main set or the diversity not subjected to the calibration test is low, which affects the power accuracy performance of the terminal device 100, and even masks the rf problem of the terminal device 100.

Based on this, an embodiment of the present application further provides a power detection circuit, as shown in fig. 3, the power detection circuit includes:

the first rf module 20 includes a plurality of first rf channels 22, a first coupling channel 21, a first connection end 20a and a second connection end 20b. The first port of the first rf path 22 and the first port of the first coupling path 21 are coupled to a first connection 20a, and the first connection 20a is further coupled to a plurality of test points Q.

In some embodiments, as shown in fig. 3, the first rf module 20 includes a first coupling module 23, a second single-pole multi-throw switch 24, and a plurality of first Power Amplifiers (PA) 25.

The first coupling module 23 is coupled to the first connection terminal 20a and the first moving terminal 61a of the first multi-pole multi-throw switch 61 to form a first coupling channel 21.

The first coupling module 23 includes, for example, a first coupler.

The third fixed terminal 24b of the second single-pole multi-throw switch 24 is coupled to the first connection terminal 20a, and a plurality of third movable terminals 24a of the second single-pole multi-throw switch 24 are coupled to the plurality of first power amplifiers 25 and the first movable terminal 61a of the first multi-pole multi-throw switch 61 to form a plurality of first rf channels 22.

In some embodiments, the power detection circuit further includes a first single pole, multiple throw switch 62. The first single-pole-multi-throw switch 62 includes a plurality of second active terminals 62a and second inactive terminals 62b, the second inactive terminals 62b are coupled to the first connection terminal 20a, and the plurality of second active terminals 62a are coupled to the plurality of test points Q.

The number of the test points Q is the same as the number of the main diversity in the first rf module 20. For example, as shown in fig. 3, if the number of the primary diversities in the first rf module 20 is two, the number of the test points Q is two. The first rf module 20 is not correspondingly provided with the rf test socket 40.

Similarly, the number of the second moving ends 62a of the first single-pole multi-throw switch 62 is the same as the number of the test points Q. For example, as shown in fig. 3, the number of the test points Q is two, the number of the second moving terminals 62a of the first single-pole multi-throw switch 62 is also two, and the two second moving terminals 62a are coupled to the two test points Q in a one-to-one correspondence. That is, the first spdt switch 62 is a spdt switch, and a second moving terminal 62a is coupled to a test point Q.

Thus, the first rf module 20 may include only one first connection terminal 20a, so as to simplify the port structure of the first rf module 20.

In other embodiments, a test point Q is directly coupled to a first connection 20a, which are in a one-to-one correspondence. Thus, the hardware configuration of the power detection circuit can be simplified.

The second rf module 30 includes a plurality of second rf channels 32, a second coupling channel 31 and a plurality of second connection terminals 30a. A first port of the second radio frequency channel 32 and a first port of the second coupling channel 31 are coupled to each of the second connection terminals 30a.

The second rf module 30 includes a second coupling module 33, a second multi-pole multi-throw switch 34, and a plurality of second power amplifiers 35.

The second coupling module 33 is coupled to the plurality of second connection terminals 30a and the first moving terminal 61a of the first multi-pole multi-throw switch 61 to form a second coupling channel 32.

A plurality of fourth stationary terminals 34b of the second multi-pole multi-throw switch 34 are correspondingly coupled to the plurality of second connection terminals 30a, and the plurality of fourth stationary terminals 34a of the second multi-pole multi-throw switch 34 are coupled to the plurality of second power amplifiers 35 and the first stationary terminal 61b of the first multi-pole multi-throw switch 61 to form a plurality of second rf channels 32.

Regarding the structure of the second coupling module 33, the second coupling module 33 includes a plurality of second couplers 331 and a third single-pole-multiple-throw switch 332.

The plurality of second coupling modules 33 are correspondingly coupled to the plurality of second connection terminals 30a, and the plurality of second coupling modules 33 are further correspondingly coupled to the plurality of fifth moving terminals 332a of the third single-pole multi-throw switch 332. The fifth stationary terminal 332b of the third single pole, multiple throw switch 332 serves as the second port of the second coupling channel 32.

In some embodiments, as shown in fig. 3, the plurality of fourth moving terminals 34a of the second multi-pole multi-throw switch 34 are further coupled to the first moving terminal 61a of the first multi-pole multi-throw switch 61.

A plurality of rf test sockets 40, wherein the plurality of rf test sockets 40 are correspondingly coupled to the plurality of second connection terminals 30a.

That is, the rf test sockets 40 are coupled to the second connection terminals 30a in a one-to-one correspondence, and one rf test socket 40 is coupled to each second connection terminal. That is, each second connection end 30a of the second rf module 30 is coupled to the corresponding rf test socket 40.

The number of the radio frequency test sockets 40 is the same as that of the main diversity of the second radio frequency module 30, and each main diversity and each diversity respectively correspond to a radio frequency test socket 40. For example, as shown in fig. 3, the number of the main diversity of the second rf module 30 is two, and the number of the rf test sockets 40 is also two.

A Radio Frequency Integrated Circuit (RFIC) comprising a test receiver 50, the test receiver 50 being integrated in the radio frequency integrated circuit. A test receiver 50 for measuring the power of the first coupling path 21.

The first multi-pole multi-throw switch 61 includes a plurality of first moving terminals 61a and a plurality of first stationary terminals 61b. The first moving ends 61a are correspondingly coupled to the second ports of the first rf channels 22, the second ports of the first coupling channels 21, the second ports of the second rf channels 32, and the second ports of the second coupling channels 31. The plurality of first stationary terminals 61b are coupled to the second ports of the plurality of second rf channels 32 and the test receiver 60.

In some embodiments of the present application, the second ports of the first rf channels 22 are coupled to the same first moving terminal 61a, the second ports of the second rf channels 32 are coupled to the same first moving terminal 61a, and the second ports of the second rf channels 32 are further coupled to the same first stationary terminal 61b.

The first moving terminals 61a are coupled to the second ports of the first rf channels 22, the second port of the first coupling channel 21, the second ports of the second rf channels 32 and the second port of the second coupling channel 31, it is understood that the first multi-pole multi-throw switch 61 includes four first moving terminals 61a, the second ports of the first rf channels 22 are coupled to one first moving terminal 61a, the second port of the first coupling channel 21 is coupled to one first moving terminal 61a, the second ports of the second rf channels 32 are coupled to one first moving terminal 61a, and the second port of the second coupling channel 31 is coupled to one first moving terminal 61 a. And the second ports of the plurality of first rf channels 22, the second port of the first coupling channel 21, the second ports of the plurality of second rf channels 32 and the second port of the second coupling channel 31 are respectively coupled to different first movable terminals 61 a.

In the driving process of the power detection circuit, calibration detection can be performed under two scenes.

The first scenario is that calibration detection is performed at the station of the whole machine.

After the printed circuit board provided with the power detection circuit is assembled in a terminal device, as shown in fig. 4, the terminal device includes an antenna, and the plurality of test points Q and the plurality of radio frequency test sockets 40 are each coupled to a different antenna.

That is, one test point Q is coupled to one antenna, one rf test socket 40 is coupled to one antenna, and one antenna is coupled to only one test point Q or one rf test socket 40.

In the second scenario, calibration and detection are performed at a single board station.

That is, the calibration test is directly performed on the printed circuit board provided with the above-described power detection circuit.

In this case, the test point Q and the load at the end of the rf test socket 40 are close to open, and during calibration detection, the load connected with the matching circuit is connected to the power detection circuit to provide a matching load for the path. So that the input impedance at the test point Q and the rf test socket 40 is satisfactory (e.g., approximately 50 ohms).

Wherein in some embodiments the load is mounted on a separate tooling plate without adding additional circuitry to the terminal device 100.

Based on this, in some embodiments of the present application, as shown in fig. 5A, the power detection circuit further includes a detection auxiliary module 70, and the detection auxiliary module 70 is coupled to the test point Q and the load for connecting the load to the test point Q.

As for the detection auxiliary module, as shown in fig. 5A, the detection auxiliary module 70 includes an inductor L, a capacitor C, and an antenna spring 71.

One end of the inductor L is coupled with the test point Q, and the other end of the inductor L is coupled with the reference ground.

One end of the capacitor C is coupled to the test point Q, and the other end of the capacitor C is coupled to the antenna spring 71.

The antenna dome 71 is used for coupling with a load.

And regarding the load, under the scene of the station of the whole machine, the load is the antenna. In a single board station scene, the load can be any equivalent matching circuit.

It should be noted that the sizes of the inductor L and the capacitor C in the auxiliary detection module 70 coupled to the test point Q and the rf test socket 40 are not limited to be the same, and may be different, and may be set reasonably as required.

Illustratively, as shown in fig. 5B, the matching circuit includes a first inductance L1, a second inductance L2, and an antenna tuner 80.

The first inductor L1 has one end coupled to the connection point O and one end coupled to the reference ground. The second inductor L2 has one end coupled to the antenna tuner 80 and one end coupled to the reference ground. One end of the antenna tuner 80 is also coupled to the connection point O. The matching circuit is coupled to the antenna spring 71 through the connection point O.

Based on this, an embodiment of the present application further provides a driving method of the power detection circuit, including:

s1, the radio frequency test socket 40 receives a first test power signal P1, the first test power signal P1 passes through the second radio frequency channel 32 and the first multi-pole multi-throw switch 61 to reach the first radio frequency channel 22 (a trace of a thick solid line in fig. 6), and a first received signal W1 of the test point Q is detected; the difference X1 between the first received signal W1 and the first test power signal P1 is obtained to obtain the line loss between the rf test socket 40 and the test point Q.

For example, P1=10dbm, w1=2dbm, and x1=8dbm.

In step S1, the second rf channel 32 can be any one of the second rf channels 32 in the second rf module 30, and is controlled by the second multi-pole multi-throw switch 34 to be selected. The first rf channel 22 can be any one of the first rf channels 22 in the first rf module 20, and is selected by the second single-pole-multiple-throw switch 24.

The first test power signal P1 may be transmitted by an external device or the processor 110 in the terminal device 100. The signal at the test point Q is detected, for example, by a meter. The process of obtaining the difference X1 between the first received signal W1 and the first test power signal P1 can be performed by the processor 110. X1 may be stored in the memory of the terminal device 100 described above, for example.

S2, the radio frequency test socket 40 receives a second test power signal P2, the second test power signal P2 passes through the second radio frequency channel 32 and the first multi-pole multi-throw switch 61 to the first radio frequency channel 22, and then passes through the first coupling channel 21 and the first multi-pole multi-throw switch 61 to the test receiver 50 (the trace of the bold dot-dash line in fig. 6), detects a second receiving signal W2 of the test receiver 50, and establishes a mapping relationship between the test power signal P of the test point Q and the second receiving signal W2.

For example, P2=0dbm, w2= -10dbm, P = -8dBm.

Wherein, in step S2, the second radio frequency channel 32 and the first radio frequency channel 22 are the same as in step S1, P = P2-X1.

That is, the rf test socket 40 receives the second test power signal P2, and the second received signal W2 is received at the test receiver 50, and the line loss between the rf test socket 40 and the test point Q is X1. Then, the second test power signal P2 received by the rf test socket 40 minus the line loss X1 between the rf test socket 40 and the test point Q is equivalent to the test power signal P at the test point Q (P = P2-X1). So that a mapping relationship between the test power signal P at the test point Q and the second received signal W2 can be obtained.

And S3, repeatedly receiving different second test power signals P2 by the radio frequency test base 40, and establishing a mapping relation table of the different test power signals P and the second receiving signals W2 of the test point Q.

For example table 1 below.

TABLE 1

Second test Power Signal P2 (dBm)	Second received signal W2 (dBm)	Test power signal P (dBm)
			0	-10	-8
1	-11	-7
			2	-12	-6

The mapping table of the test power signals P and W2 at different test points Q may be stored in the memory, for example.

And S4, a preset power signal P3 in the first radio frequency channel 22 passes through the first coupling channel 21 to the test receiver 50, a third receiving signal W3 of the test receiver 50 is detected, and a mapping relation between P3 and W3 is established.

For example, P3=10, W3= -10.

The preset power signal P3 may be transmitted from the first power amplifier 25 in the third rf channel 22, for example.

S5, different preset power signals P3 are repeatedly transmitted to the test receiver 50 through the first coupling channel 21, and a mapping relation table between the preset power signals P3 and the third received signal W3 is established.

For example table 2 below.

TABLE 2

That is, the preset power signals P3 of the gears are respectively calibrated.

When the preset power signal P3 is transmitted from the first power amplifier 25 in the third rf channel 22, which time is transmitted from which first power amplifier 25 can be controlled by the second single-pole multi-throw switch 24.

S6, establishing a mapping relation table of the test power signal P and the preset power signal P3 according to the mapping relation table of the test power signal P and the second receiving signal W2 and the mapping relation table of the preset power signal P3 and the third receiving signal W3.

Since the second received signal W2 and the third received signal W3 are both received signals of the test receiver 50, when the values of W2 and W3 are the same, a mapping relationship between the test power signal P and the preset power signal P3 can be established.

For example, according to tables 1 and 2, three sets of values W2 and W3 are the same, and a mapping table of the test power signal P and the predetermined power signal P3 is established as shown in table 3 below.

TABLE 3

Test power signal P (dBm)	Preset power signal P3 (dBm)
		-8	10
-7	12
		-6	14

Thereby completing calibration of one rf channel in the first rf module 20. By repeating the above process, calibration of each rf channel in the first rf module 20 can be completed.

It will be appreciated that each time which radio frequency channel is selected for calibration, it may be controlled by the first single pole, multiple throw switch 62.

The calibration of the rf channel in the second rf module 30 can be directly completed by the rf test socket 40, for example, the second power amplifier 35 outputs a power signal, and the rf test socket 40 directly detects the received signal to complete the calibration, which is not described herein again.

In the embodiment of the present invention, the rf test socket 40 coupled to the first rf module 20 is omitted, so that a channel in the first rf module 20 and a channel in the second rf module 30 form a channel therebetween. The calibration test for the channel in the first rf module 20 is performed by testing the capability of the receiver 50 and the rf test socket 40 coupled to the second rf module 30. That is, the power detection circuit provided in the embodiment of the present application can still perform the calibration test on the rf channel in the first rf module 20, although the rf test socket 40 corresponding to the first rf module 20 is omitted. Therefore, compared with the related art, the power detection circuit provided by the embodiment of the application can omit part of the radio frequency test seats 40, save the board layout area of the PCB, improve the utilization rate of the PCB of the terminal device 100, and simultaneously can not cover the radio frequency problem of certain channels and can not sacrifice the power precision performance of certain channels. Therefore, the power detection circuit provided by the embodiment of the application can meet the requirement that when the PCB layout area of the terminal device 100 is short, the occupied area of the device needs to be reduced under the condition that the functional device is not deleted and the performances such as radio frequency and the like are not lost.

The embodiment of the present application further provides a driving method of a power detection circuit, including:

s10, the radio frequency test base 40 receives a first test power signal P1, the first test power signal P1 passes through the second radio frequency channel 32 and the first multi-pole multi-throw switch 61 to reach the first radio frequency channel 22, and a first receiving signal W1 of a test point Q is detected; a difference X1 between the first received signal W1 and the first test power signal P1 is obtained.

For example, P1=10dBm, w1=2dBm, x1=8dBm.

Step S10 is the same as S1, and reference may be made to the related description, which is not repeated herein.

S20, the radio frequency test base 40 receives a second test power signal P2, the second test power signal P2 passes through the second radio frequency channel 32 and the first multi-pole multi-throw switch 61 to reach the first radio frequency channel 22, then passes through the first coupling channel 21 and the first multi-pole multi-throw switch 61 to reach the test receiver 50, a second receiving signal W2 of the test receiver 50 is detected, and a mapping relation between the test power signal P of the test point Q and the second receiving signal W2 is established; wherein P = P2-X1.

For example, P2=0dbm, w2= -10dbm, P = -8dBm.

Step S20 is the same as step S2, and reference may be made to the related description, which is not repeated herein.

S30, the preset power signal P3 in the first rf channel 22 passes through the first coupling channel 21 to the test receiver 50, and detects the third receiving signal W3 of the test receiver 50, so as to establish a mapping relationship between the preset power signal P3 and the third receiving signal W3.

For example, P3=10dbm, w3= -10dBm.

S40, establishing a mapping relation between the test power signal P and the preset power signal P3 according to the mapping relation between the test power signal P and the second receiving signal W2 and the mapping relation between the preset power signal P3 and the third receiving signal W3.

For example, P = -8dbm, P3= -10dbm.

S50, detecting a fourth received signal W4 of the rf test socket 40 by the same predetermined power signal P3 in the first rf channel 22 through the first coupling channel 21 and the first multi-pole multi-throw switch 61 to the second rf channel 32 (as shown by the thick solid line in fig. 7); acquiring a difference X2 between the fourth received signal W4 and the test power signal P; to obtain the line loss between the rf test socket 40 and the test point Q.

That is, the preset power signal P3 of step S50 is the same as the preset power signal P3 of step S30.

The process of obtaining the difference X2 between the fourth received signal W4 and the test power signal P includes: acquiring a mapping relation between the fourth received signal W4 and the preset power signal P3, and acquiring a mapping relation between the test power signal P3 and the preset power signal P3 and a mapping relation between the fourth received signal W4 and the preset power signal P3, so as to acquire a difference X2 between the test power signal P and the fourth received signal W4 under the same preset power signal P3 and the same test power signal P3 and the same fourth received signal W4.

For example, P3=10dbm, w4=0dbm, P = -8dbm, and x2= -8dbm.

S60, different predetermined power signals P3 in the first rf channel 22 repeatedly pass through the first coupling channel 21 and the first multi-pole multi-throw switch 61 to the second rf channel 32, detect the fifth received signal W5 of the rf test socket 40, and establish a mapping relationship table between the predetermined power signals P3 and the test power signals P, where P = W5-X2.

For example table 4 below.

TABLE 4

Test power signal P (dBm)	Preset power signal P3 (dBm)	Fifth received signal W5 (dBm)
			-8	10	0
-7	12	-1
			-6	14	-2

In the driving method of the power detection circuit, in the detection process, the step S30 is executed only once, and only a certain value in the dynamic range of the test receiver 50 needs to be taken, and multiple values are not needed. Therefore, there is a lower requirement for the dynamic range and power accuracy within the dynamic range of the test receiver 50.

In some embodiments of the present application, the first rf module 20 is a low frequency rf module relative to the second rf module 30.

Illustratively, the first rf module 20 is a Low Band (LB) rf module, and the second rf module 30 is a Mid and High Band (MHB) rf module.

Therefore, the radio frequency module not correspondingly provided with the radio frequency test seat 40 needs to be calibrated through the radio frequency module correspondingly provided with the radio frequency test seat 40, and the low-frequency-band signal can pass through the high-frequency-band radio frequency module, but the high-frequency-band signal passes through the low-frequency-band radio frequency module, so that the requirement on the performance of components in the low-frequency-band radio frequency module is high. Therefore, the second rf module 30 is correspondingly provided with the rf test socket 40, and the second rf module 30 is limited to be a middle-high frequency band rf module, which can avoid the problem that the middle-high frequency band signal cannot pass through the second single-pole multi-throw switch 24 and cannot complete the calibration of the rf channel in the second rf module 30 due to the performance of the second single-pole multi-throw switch 24 in the first rf module 20 being not satisfactory, and reduce the requirement for the second single-pole multi-throw switch 24.

It should be noted that the PCB in the terminal device 100 may further include components such as a radio frequency front end module, and the components such as the first coupler and the second coupler in the power detection circuit may be integrated in the radio frequency front end module.

The above description is only an embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions within the technical scope of the present disclosure should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A power detection circuit, comprising:

the first radio frequency module comprises a plurality of first radio frequency channels, a first coupling channel and a first connecting end; a first port of the first radio frequency channel and a first port of the first coupling channel are coupled with the first connection end, and the first connection end is further coupled with a plurality of test points;

the second radio frequency module comprises a plurality of second radio frequency channels and a plurality of second connecting ends; the first ports of the plurality of second radio frequency channels are coupled with each second connection end;

the radio frequency test seats are correspondingly coupled with the second connecting ends;

a test receiver for measuring the power of the first coupled channel;

a first multi-pole multi-throw switch comprising a plurality of first moving terminals and a plurality of first stationary terminals; the plurality of first active terminals are correspondingly coupled to the second ports of the plurality of first rf channels, the second port of the first coupling channel, and the second ports of the plurality of second rf channels, and the plurality of first inactive terminals are correspondingly coupled to the second ports of the plurality of second rf channels and the test receiver.

2. The power detection circuit of claim 1, wherein the first RF module is a low frequency RF module relative to the second RF module.

3. The power detection circuit of claim 1, further comprising a first single-pole-multiple-throw switch;

the first single-pole multi-throw switch comprises a plurality of second movable ends and second immovable ends, the second immovable ends are coupled with the first connecting ends, and the plurality of second movable ends are correspondingly coupled with the plurality of test points.

4. The power detection circuit of claim 1, wherein the first rf module comprises a first coupler, a second single-pole-multiple-throw switch, and a plurality of first power amplifiers;

the first coupler is coupled with the first connecting end and the first movable end to form the first coupling channel;

the third fixed end of the second single-pole multi-throw switch is coupled with the first connecting end, and a plurality of third movable ends of the second single-pole multi-throw switch are coupled with the first power amplifiers and the first movable end to form a plurality of first radio frequency channels.

5. The power detection circuit of claim 1, wherein the second radio frequency module comprises a second multi-pole multi-throw switch and a plurality of second power amplifiers;

a plurality of fourth fixed terminals of the second multi-pole multi-throw switch are correspondingly coupled to the plurality of second connection terminals, and a plurality of fourth fixed terminals of the second multi-pole multi-throw switch are coupled to the plurality of second power amplifiers and the first fixed terminal to form the plurality of second radio frequency channels.

6. The power detection circuit of claim 5, wherein the second radio frequency module further comprises a plurality of second couplers and a third single-pole-multiple-throw switch;

the plurality of second couplers are correspondingly coupled with the plurality of second connecting ends and also correspondingly coupled with a plurality of fifth moving ends of the third single-pole multi-throw switch; the first multi-pole multi-throw switch also includes the first moving terminal separately coupled to a fifth stationary terminal of the third single-pole multi-throw switch.

7. The power detection circuit of any of claims 1-6, further comprising a detection assist module coupled to the test point and the load for communicating the load to the test point.

8. The power detection circuit of claim 1, wherein the detection assistance module comprises an inductor, a capacitor, and an antenna spring;

one end of the inductor is coupled with the test point, and the other end of the inductor is coupled with a reference ground end;

one end of the capacitor is coupled with the test point, and the other end of the capacitor is coupled with the antenna spring;

the antenna shrapnel is used for being coupled with a load.

9. The power detection circuit of claim 1, further comprising a radio frequency integrated circuit in which the test receiver is integrated.

10. A printed circuit board, comprising: a circuit board body and a power detection circuit as claimed in any one of claims 1 to 9; the power detection circuit is arranged on the circuit board body.

11. A terminal device, comprising: the printed circuit board and plurality of antennas of claim 10;

the plurality of test points and the plurality of radio frequency test sockets of the power detection circuit in the printed circuit board are respectively coupled with different antennas.

12. A driving method of a power detection circuit is characterized in that the power detection circuit comprises a first radio frequency module, a second radio frequency module, a plurality of radio frequency test seats, a test receiver and a first multi-pole multi-throw switch; the first radio frequency module comprises a plurality of first radio frequency channels, a first coupling channel and a first connecting end; the second radio frequency module comprises a plurality of second radio frequency channels and a plurality of second connecting ends;

the driving method of the power detection circuit comprises the following steps:

the radio frequency test socket receives a first test power signal P1, the first test power signal P1 is transmitted to the first radio frequency channel through the second radio frequency channel and the first multi-pole multi-throw switch, and a first receiving signal W1 of the test point is detected; acquiring a difference X1 between the first received signal W1 and the first test power signal P1;

the radio frequency test socket receives a second test power signal P2, the second test power signal P2 passes through the second radio frequency channel and the first multi-pole multi-throw switch to reach the first radio frequency channel, then passes through the first coupling channel and the first multi-pole multi-throw switch to reach the test receiver, a second receiving signal W2 of the test receiver is detected, and a mapping relation between the test power signal P of the test point and the second receiving signal W2 is established; wherein P = P2-X1;

the radio frequency test seat repeatedly receives different second test power signals P2, and a mapping relation table of the test power signals P and the second receiving signals W2 is established;

a preset power signal P3 in a first radio frequency channel is transmitted to the test receiver through the first coupling channel, a third receiving signal W3 of the test receiver is detected, and a mapping relation between the preset power signal P3 and the third receiving signal W3 is established;

different preset power signals P3 are repeatedly transmitted to the test receiver through the first coupling channel, and a mapping relation table of the preset power signals P3 and the third receiving signals W3 is established;

and establishing a mapping relation table of the test power signal P and the preset power signal P3 according to the mapping relation table of the test power signal P and the second receiving signal W2 and the mapping relation table of the preset power signal P3 and the third receiving signal W3.

13. A driving method of a power detection circuit is characterized in that the power detection circuit comprises a first radio frequency module, a second radio frequency module, a plurality of radio frequency test seats, a test receiver and a first multi-pole multi-throw switch; the first radio frequency module comprises a plurality of first radio frequency channels, a first coupling channel and a first connecting end; the second radio frequency module comprises a plurality of second radio frequency channels, a second coupling channel and a plurality of second connecting ends;

the radio frequency test socket receives a second test power signal P2, the second test power signal P2 is transmitted to the first radio frequency channel through the second radio frequency channel and the first multi-pole multi-throw switch, and then is transmitted to the test receiver through the first coupling channel and the first multi-pole multi-throw switch, a second receiving signal W2 of the test receiver is detected, and a mapping relation between the test power signal P of the test point and the second receiving signal W2 is established; wherein P = P2-X1;

establishing a mapping relation between the test power signal P and the preset power signal P3 according to a mapping relation between the test power signal P and the second received signal W2 and a mapping relation between the preset power signal P3 and the third received signal W3;

the same preset power signal P3 in the first rf channel passes through the first coupling channel and the first multi-pole multi-throw switch to the second rf channel, and a fourth received signal W4 of the rf test socket is detected; acquiring a difference X2 between the fourth received signal W4 and the test power signal P;

and repeatedly passing different preset power signals P3 in the first radio frequency channel through the first coupling channel and the first multi-pole multi-throw switch to the second radio frequency channel, detecting a fifth receiving signal W5 of the radio frequency test seat, and establishing a mapping relation table between the preset power signals P3 and the test power signals P, wherein P = W5-X2.