CN220273677U

CN220273677U - Signal receiving and transmitting circuit and electronic equipment

Info

Publication number: CN220273677U
Application number: CN202322289941.9U
Authority: CN
Inventors: 鲁子鹏
Original assignee: TP Link Technologies Co Ltd
Current assignee: TP Link Technologies Co Ltd
Priority date: 2023-08-24
Filing date: 2023-08-24
Publication date: 2023-12-29
Anticipated expiration: 2033-08-24

Abstract

The signal receiving and transmitting circuit comprises a power amplification module, a frequency selection module, a transmitting module, a receiving module and a processing module, wherein the power amplification module is used for amplifying a received first transmitting signal to obtain and output a second transmitting signal; the frequency selecting module is used for filtering the second transmitting signal based on the frequency selecting control signal so as to filter out a signal of a frequency band corresponding to the frequency selecting control signal in the second transmitting signal, and obtain and output a third transmitting signal; the transmitting module is used for generating and transmitting a wireless radio frequency signal based on the third transmitting signal; the receiving module is used for receiving the wireless radio frequency signals and generating receiving signals based on the wireless radio frequency signals; the processing module is used for outputting a frequency selection control signal for adjusting the frequency of the third transmitting signal based on the receiving signal. The signal receiving and transmitting circuit can adjust the frequency of the third transmitting signal according to the signal index of the receiving signal, so that the frequency of the wireless radio frequency signal is changed to avoid co-channel interference.

Description

Signal receiving and transmitting circuit and electronic equipment

Technical Field

The application belongs to the technical field of wireless communication, and particularly relates to a signal receiving and transmitting circuit and electronic equipment.

Background

At present, in wireless communication, the intensity of a radio frequency signal received by a radio frequency signal receiving device from the radio frequency signal transmitting device varies greatly due to the influence of various factors such as the magnitude of radio frequency transmission power of the radio frequency signal transmitting device, the distance between the radio frequency signal transmitting device and the radio frequency signal receiving device, and the propagation fading of electric waves.

In the prior art, when two devices with the frequency of the radio frequency signal being close to or even the same as each other are close to each other, the frequency of the useless signal is the same as that of the useful signal, which can affect the receiver for receiving the useful signal, thereby generating co-channel interference and affecting the communication quality. Taking Sub1G communication as an example, since Sub1G signals are mostly transmitted by carriers with single frequency points, the signals are easy to be interfered, which causes error codes of a receiving end and waste of sensitivity of the receiving end, and currently, sub1G communication conventionally adopts a mode of improving transmission power to improve receiving conditions, but the cost is greatly increased.

Disclosure of Invention

The purpose of the application is to provide a signal receiving and transmitting circuit and electronic equipment, and aims to solve the problem of co-channel interference existing in the traditional radio frequency signals.

A first aspect of an embodiment of the present application provides a signal transceiving circuit, including: the power amplification module is used for amplifying the received first transmission signal to obtain and output a second transmission signal; the frequency selecting module is connected with the output end of the power amplifying module and is used for carrying out band-pass filtering on the second transmitting signal based on a frequency selecting control signal, and reserving a signal in the second transmitting signal, which corresponds to the frequency selecting control signal, in a frequency band so as to obtain and output a third transmitting signal; the transmitting module is connected with the output end of the frequency selecting module and is used for generating and transmitting a wireless radio frequency signal based on the third transmitting signal; the receiving module is coupled with the transmitting module through an electromagnetic field and is used for receiving a wireless radio frequency signal and generating a receiving signal based on the wireless radio frequency signal; wherein the received signal comprises a signal indicator of the wireless radio frequency signal; and the processing module is connected with the receiving module and the frequency selecting module and is used for outputting the frequency selecting control signal for adjusting the frequency of the third transmitting signal based on the signal index in the receiving signal.

In one embodiment, the signal transceiver circuit further includes a level conversion module connected to an input end of the power amplification module, where the level conversion module is configured to perform level conversion on an input transmission signal, so as to generate and output the first transmission signal matched with the power amplification module.

In one embodiment, the level shift module includes: the first switch tube and the first current limiting resistor; the first conducting end of the first switching tube is used for receiving the input transmitting signal, the controlled end of the first switching tube is used for being connected with a first power supply, and the second conducting end of the first switching tube is connected with the power amplifying module; the first end of the first current limiting resistor is used for being connected with a second power supply, and the second end of the first current limiting resistor is connected with the second conducting end of the first switching tube.

In one embodiment, the power amplification module includes: the second switch tube, the second current limiting resistor, the first feedback capacitor, the second feedback capacitor and the first filter capacitor; the first conducting end of the second switching tube is connected with the frequency selection module, the controlled end of the second switching tube is used for receiving the first transmission signal, the second conducting end of the second switching tube is connected with the first end of the second current limiting resistor, and the second end of the second current limiting resistor is grounded; the first end of the first feedback capacitor is connected with the first conducting end of the second switching tube, the second end of the first feedback capacitor is connected with the second conducting end of the second switching tube, the first end of the second feedback capacitor is connected with the second end of the first feedback capacitor, the second end of the second feedback capacitor is grounded, the first end of the first filter capacitor is grounded, and the second end of the first filter capacitor is connected with the controlled end of the second switching tube.

In one embodiment, the frequency selecting module includes an inductance adjusting unit, a first end of the inductance adjusting unit is connected with the output end of the power amplifying module, a second end of the inductance adjusting unit is connected with a third power supply, and the inductance adjusting unit is used for adjusting inductance between the output end of the power amplifying module and the third power supply.

In one embodiment, the inductance adjusting unit comprises a plurality of control switches and a plurality of frequency-selecting inductors; the controlled end of each control switch is connected with the processing module, and the frequency selection control signal is used for controlling the on and off of each control switch; and one control switch and one frequency-selecting inductor are connected in series between the output end of the power amplification module and the third power supply.

In one embodiment, the frequency selecting module further includes a third current limiting resistor, the third current limiting resistor is connected in series between the inductance adjusting unit and the third power supply, a first end of the third current limiting resistor is connected with the third power supply, and a second end of the third current limiting resistor is connected with the second end of the inductance adjusting unit.

In one embodiment, the transmitting module includes a first impedance matching unit and a transmitting antenna, a first end of the first impedance matching unit is connected with the frequency selecting module, a second end of the first impedance matching unit is connected with the transmitting antenna, the first impedance matching unit is used for reducing transmission loss of the third transmitting signal, and the transmitting antenna is used for generating and transmitting a radio frequency signal based on the third transmitting signal.

In one embodiment, the processing module includes a main control chip and a crystal oscillator unit; the crystal oscillator unit is used for configuring the frequency of the receiving signal which can be received by the main control chip, and the main control chip is used for outputting the frequency selection control signal for adjusting the frequency of the third transmitting signal based on the signal index in the receiving signal and adjusting the working frequency of the crystal oscillator unit.

A second aspect of the embodiments of the present application provides an electronic device, including a signal transceiver circuit as described above.

Compared with the prior art, the embodiment of the application has the beneficial effects that: the signal receiving and transmitting circuit can adjust the frequency of the third transmitting signal according to the signal index of the receiving signal, so that the frequency of the wireless radio frequency signal is changed, the interference frequency is avoided, and the same-frequency interference is avoided.

Drawings

Fig. 1 is a schematic diagram of a signal transceiver circuit according to an embodiment of the present disclosure;

fig. 2 is another schematic diagram of a signal transceiver circuit according to an embodiment of the present disclosure;

fig. 3 is a specific circuit diagram of a level conversion module, a power amplification module, and a frequency selection module according to an embodiment of the present application;

FIG. 4 is a schematic diagram of RF impedance matching according to an embodiment of the present application;

fig. 5 is a specific circuit diagram of a transmitting module according to an embodiment of the present application;

fig. 6 is a specific circuit diagram of a receiving module and a processing module according to an embodiment of the present application;

fig. 7 is a schematic diagram of an electronic device according to an embodiment of the present application.

The above figures illustrate: 10. an electronic device; 20. a signal receiving and transmitting circuit; 100. a power amplification module; 200. a frequency selecting module; 210. an inductance adjusting unit; 300. a transmitting module; 310. a first impedance matching unit; 320. a transmitting antenna; 400. a receiving module; 410. a second impedance matching unit; 420. a receiving antenna; 500. a processing module; 510. a crystal oscillator unit; 600. and a level conversion module.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects to be solved by the present application more clear, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be indirectly connected to the other element.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

Fig. 1 is a schematic diagram of a signal transceiver circuit according to an embodiment of the present application, and for convenience of explanation, only the portions related to the embodiment are shown, which are described in detail below:

the signal receiving and transmitting circuit includes: a power amplification module 100, a frequency selection module 200, a transmission module 300, a reception module 400 and a processing module 500.

The power amplification module 100 is configured to amplify the received first transmission signal to obtain and output a second transmission signal. The frequency selection module 200 is connected to the output end of the power amplification module 100, and the frequency selection module 200 is configured to perform band-pass filtering on the second transmission signal based on the frequency selection control signal, and reserve a signal corresponding to the frequency selection control signal in the second transmission signal, so as to obtain and output a third transmission signal. The transmitting module 300 is connected to the frequency selecting module 200, and is configured to generate and transmit a radio frequency signal based on the third transmitting signal. The receiving module 400 is coupled to the transmitting module 300 through an electromagnetic field, and is configured to receive a radio frequency signal and generate a received signal based on the radio frequency signal, where the first transmitted signal may be an enable signal for controlling on and off of a switching device in the power amplifying module 100, and the received signal includes a signal indicator of the radio frequency signal. The processing module 500 is configured to output a frequency-selective control signal for adjusting the frequency of the third transmission signal based on the signal indicator in the received signal. The signal index includes, but is not limited to, parameters such as error rate, signal strength indication (Received Signal Strength Indication; rsi), packet loss rate, etc. The processing module 500 may be a microcontroller, a coded chip, or an integrated circuit.

It should be noted that, when the signal transceiver circuit transmits the radio frequency signal through the transmitting module 300, if the frequency of the signal transmitted by other devices is close to or the same as that of the radio frequency signal, the signal index of the radio frequency signal received by the receiving end will be affected, the signal index of the radio frequency signal is obtained by the receiving module 400, and the processing module 500 can correspondingly adjust the frequency of the third transmitting signal, thereby changing the frequency of the radio frequency signal to avoid co-channel interference.

In an embodiment, as shown in fig. 2, the signal transceiver circuit further includes a level conversion module 600, an output terminal of the level conversion module 600 is connected to an input terminal of the power amplification module 100, and the level conversion module 600 is configured to level-convert an input transmission signal to generate and output a first transmission signal matched with the power amplification module 100. The input transmitting signal may be a digital signal sent by a master device for controlling the operation of the signal transceiver circuit, and the master device may be the processing module 500.

It should be noted that, since the voltage value of the high level of the input transmission signal is generally low, it is necessary to convert the input transmission signal by the level conversion module 600 to obtain the first transmission signal capable of driving the power amplification module 100 to operate, and it is understood that the first transmission signal is an analog signal.

In one embodiment, as shown in fig. 3, the level shift module 600 includes: a first switching tube Q1 and a first current limiting resistor R1. The first conducting end of the first switching tube Q1 is used for receiving input transmitting signals, the controlled end of the first switching tube Q1 is used for being connected with the first power supply V1, and the second conducting end of the first switching tube Q1 is connected with the power amplifying module 100. The first end of the first current limiting resistor R1 is used for being connected with the second power supply V2, and the second end of the first current limiting resistor R1 is connected with the second conducting end of the first switching tube Q1.

The output voltage of the first power supply V1 is 3.3V, and the output voltage of the second power supply V2 is 5V, for example. The first switch tube Q1 can be an N-type MOS tube, the first conducting end of the first switch tube Q1 corresponds to the source electrode of the N-type MOS tube, the second conducting end of the first switch tube Q1 corresponds to the drain electrode of the N-type MOS tube, and the controlled end of the first switch tube Q1 corresponds to the grid electrode of the N-type MOS tube. When the voltage difference between the controlled end and the first conducting end of the first switching tube Q1 reaches the conducting threshold value, the first switching tube Q1 is conducted.

Therefore, when the input emission signal is at a high level, the voltage of the controlled end of the first switching tube Q1 is equal to the voltage of the first conducting end of the first switching tube Q1, the first switching tube Q1 is turned off, and at this time, the second conducting end of the first switching tube Q1 (i.e. the output end of the level conversion module 600) is at a high level of 5V, so that the power amplification module 100 can be driven. When the input transmission signal is at a low level, the voltage of the controlled end of the first switching tube Q1 is greater than the voltage of the first conducting end of the first switching tube Q1, the first switching tube Q1 is turned on, and at this time, the second conducting end of the first switching tube Q1 (i.e. the output end of the level conversion module 600) is at a low level of 0V, but the power amplification module 100 cannot be driven, so that level conversion is achieved. In some embodiments, the level shift module 600 has various forms, and may be composed of other electronic devices, for example, a level shift chip and its peripheral circuits, so as to implement level shift using the level shift chip.

In one embodiment, as shown in fig. 3, the power amplification module 100 includes: the second switch tube Q2, the second current limiting resistor R2, the first feedback capacitor C1, the second feedback capacitor C2 and the first filter capacitor C3. The first conducting end of the second switching tube Q2 is connected with the frequency selection module 200, the controlled end of the second switching tube Q2 is used for receiving the first transmission signal, the controlled end of the second switching tube Q2 is the input end of the power amplifying module 100 and is connected with the level converting module 600, the second conducting end of the second switching tube Q2 is connected with the first end of the second current limiting resistor R2, and the second end of the second current limiting resistor R2 is grounded. The first end of the first feedback capacitor C1 is connected with the first conducting end of the second switching tube Q2, the second end of the first feedback capacitor C1 is connected with the second conducting end of the second switching tube Q2, the first end of the second feedback capacitor C2 is connected with the second end of the first feedback capacitor C1, the second end of the second feedback capacitor C2 is grounded, the first end of the first filter capacitor C3 is grounded, and the second end of the first filter capacitor C3 is connected with the controlled end of the second switching tube Q2.

For example, the second switching tube Q2 may be an NPN transistor, the first conductive end of the second switching tube Q2 corresponds to a collector of the NPN transistor, the second conductive end of the second switching tube Q2 corresponds to an emitter of the NPN transistor, and the controlled end of the second switching tube Q2 corresponds to a base of the NPN transistor.

It should be noted that the second transmitting signal actually consists of thermal noise of the second switching tube Q2 and disturbance generated by the first transmitting signal through the second switching tube Q2 when the high-low level is switched, and the second transmitting signal is amplified through the second switching tube Q2, the first feedback capacitor C1 and the second feedback capacitor C2 to obtain the second transmitting signal finally output. For the alternating current signal, the capacitor can be equivalently a short circuit, the first feedback capacitor C1 and the second feedback capacitor C2 can feed back the signal of the first conducting end of the second switching tube Q2 to the emitter of the second switching tube Q2, the second switching tube Q2 can amplify the signal and output the signal from the first conducting end of the second switching tube Q2, and the signal is fed back to the emitter of the second switching tube Q2 by the first feedback capacitor C1 and the second feedback capacitor C2, so that the effect of cyclic amplification is achieved, until the power of the second transmitting signal reaches the limit of the second switching tube Q2, and meanwhile, the first feedback capacitor C1 and the second feedback capacitor C2 can also cooperate with the frequency selection module 200 to carry out multiple filtering on the second transmitting signal, so that the optimal filtering effect is achieved.

In an embodiment, as shown in fig. 3, the frequency selection module 200 includes an inductance adjustment unit 210, a first end of the inductance adjustment unit 210 is connected to the output end of the power amplification module 100, a second end of the inductance adjustment unit 210 is connected to the third power source V3, and the inductance adjustment unit 210 is configured to adjust an inductance between the output end of the power amplification module 100 and the third power source V3.

The frequency of the resonance frequency point of the frequency selection module 200 (i.e., the frequency selection frequency of the frequency selection module 200) can be controlled by adjusting the inductance between the output terminal of the power amplification module 100 and the third power supply V3, as shown in fig. 4, when a signal is to enter the transmission module 300 through the frequency selection module 200, the frequency is equal to the frequency (ω ₀ ) The impedance Z (ω) of the frequency selection module 200 is the smallest, so that the signal can enter the transmitting module 300 through the frequency selection module 200, and the signals with the rest frequencies can be filtered by the frequency selection module 200, thereby realizing the band-pass filtering.

In an embodiment, the inductance adjustment unit 210 includes a number of control switches and a number of frequency-selective inductances. The controlled end of each control switch is connected with the processing module 500. One end of the at least one control switch is connected with the output end of the power amplification module 100, and the other end of the at least one control switch is connected with the third power supply V3 through at least one frequency-selecting inductor. The frequency-selecting control signal sent by the processing module 500 can control the on and off of each control switch. When the control switch is turned on, a corresponding frequency-selecting inductor may be connected to the circuit, so as to adjust the inductance between the output end of the power amplifying module 100 and the third power V3, and change the frequency of the resonance frequency point of the frequency-selecting module 200.

Illustratively, as shown in fig. 3, the inductance adjustment unit 210 includes a first control switch S1, a second control switch S2, a first frequency-selective inductance L1, and a second frequency-selective inductance L2. The first end of the first control switch S1 is connected to the output end of the power amplifying module 100, and the second end of the first control switch S1 is connected to the third power supply V3 through the first frequency-selecting inductor L1. The first end of the second control switch S2 is connected to the output end of the power amplifying module 100, and the second end of the second control switch S2 is connected to the third power supply V3 through the second frequency-selecting inductor L2.

The frequency-selecting inductor and the first feedback capacitor C1 and the second feedback capacitor C2 form an LC filter resonant circuit, the second transmitting signal can be subjected to narrow-band pass filtering, specific parameters of the inductor between the second transmitting signal and the third power supply V3 can influence the frequency of the finally transmitted wireless radio frequency signal, and specific parameters of the frequency-selecting inductor, the first feedback capacitor C1 and the second feedback capacitor C2 can be set according to actual requirements.

In some embodiments, the frequency selection module 200 may include LC filter circuits in any combination to accurately control the frequency of the resonance frequency points of the frequency selection module 200. Meanwhile, the signals filtered by the frequency selection module 200 can be fed back to the emitter of the second switching tube Q2 through the first feedback capacitor C1 and the second feedback capacitor C2, and the signals can be circularly filtered, so that the frequency selection effect is more obvious.

On the basis of the first feedback capacitor C1 and the second feedback capacitor C2, the frequency of the wireless radio frequency signal can be adjusted by controlling the number of frequency-selecting inductors of the access circuit through the control switch. For example, if the initial frequency of the radio frequency signal is 433.92MHz, when the processing module 500 detects that a part of signal indexes of the radio frequency signal exceeds a preset threshold (for example, the error rate is greater than a preset value or the packet loss rate is greater than a preset value), the number of on control switches can be increased, so that the frequency of the radio frequency signal becomes 433.72MHz, and meanwhile, only relevant parameters of the signal receiving end need to be adjusted, so that the signal receiving end can control to receive 433.72MHz signals, and the same-frequency interference can be reduced. If the frequency of the wireless radio frequency signal is 433.72MHz, part of signal indexes of the wireless radio frequency signal still exceed the preset threshold, the number of the on control switches can be increased continuously, and the frequency of the wireless radio frequency signal is reduced until the signal indexes of the wireless radio frequency signal are within the preset threshold.

In an embodiment, as shown in fig. 3, the frequency selection module 200 further includes a third current limiting resistor R3. The third current limiting resistor R3 is connected in series between the inductance adjusting unit 210 and the third power source V3, a first end of the third current limiting resistor R3 is connected to the third power source V3, and a second end of the third current limiting resistor R3 is connected to the second end of the inductance adjusting unit 210. The output voltage of the third power supply V3 may be 12V. In some embodiments, the output voltage of the second power supply V2 is equal to the output voltage of the third power supply V3.

In an embodiment, as shown in fig. 5, the transmitting module 300 includes a first impedance matching unit 310 and a transmitting antenna 320, a first end of the first impedance matching unit 310 is connected to the frequency selecting module 200, a second end of the first impedance matching unit 310 is connected to the transmitting antenna 320, the first impedance matching unit 310 is used for reducing a transmission loss of a third transmitting signal, and the transmitting antenna 320 is used for generating and transmitting a radio frequency signal based on the third transmitting signal.

It should be noted that, the first impedance matching unit 310 has no fixed specific circuit structure, and the first impedance matching unit 310 needs to be configured to have a suitable impedance, for example, 50Ω, according to the signal transmission line theory, so as to reduce the transmission loss of the signal.

The first impedance matching unit 310 includes a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8, a resistor R4, a resistor R5, an inductor L4, an inductor L5, and an inductor L6.

The first end of the capacitor C5 is connected with the frequency selection module 200, the first end of the resistor R4 is connected with the second end of the capacitor C5, the first end of the capacitor C6 is connected with the second end of the resistor R4, the second end of the capacitor C6 is grounded, the first end of the inductor L4 is connected with the second end of the inductor L4, the second end of the capacitor C7 is grounded, the first end of the resistor R5 is connected with the second end of the inductor L4, the first end of the inductor L5 is connected with the second end of the resistor R5, the second end of the inductor L5 is grounded, the first end of the inductor L6 is connected with the second end of the resistor R5, the second end of the inductor L6 is connected with the transmitting antenna 320, the first end of the capacitor C8 is connected with the second end of the inductor L6, and the second end of the capacitor C8 is grounded.

In an embodiment, as shown in fig. 6, the processing module 500 includes a main control chip U1 and a crystal oscillator unit 510, the receiving module 400 includes a second impedance matching unit 410 and a receiving antenna 420, a first end of the second impedance matching unit 410 is connected to the main control chip U1, a second end of the second impedance matching unit 410 is connected to the receiving antenna 420, and the crystal oscillator unit 510 is connected to the main control chip U1. The second impedance matching unit 410 is for reducing transmission loss of a received signal, and the receiving antenna 420 is for generating and outputting the received signal based on the received wireless radio frequency signal. The main control chip U1 is configured to output a frequency selection control signal for adjusting the frequency of the third transmission signal based on the signal index in the received signal, and adjust the working frequency of the crystal oscillator unit 510, where the crystal oscillator unit 510 is configured to configure the frequency of the received signal that can be received by the main control chip U1.

It should be noted that, when the main control chip U1 changes the frequency of the outputted radio frequency signal by the frequency control signal, since the received signal is obtained based on the radio frequency signal, in order to obtain the signal index of the radio frequency signal, the working frequency of the crystal oscillator unit 510 needs to be synchronously modified so that the main control chip U1 can obtain the received signal after the frequency change. The working frequency of the crystal oscillator unit 510 can be modified by adjusting the parameters of the load capacitance of the crystal oscillator unit 510.

As shown in fig. 6, the crystal oscillator unit 510 includes a crystal oscillator X1, a third control switch S3, a fourth control switch S4, a first load capacitor C11 and a second load capacitor C12, where the crystal oscillator X1 is connected between an XIN end of the main control chip U1 and ground, a first end of the third control switch S3 is connected to the crystal oscillator X1, a second end of the third control switch S3 is connected to a first end of the first load capacitor C11, a second end of the first load capacitor C11 is grounded, a first end of the fourth control switch S4 is connected to a second end of the third control switch S3, a second end of the fourth control switch S4 is connected to a first end of the second load capacitor C12, a second end of the second load capacitor C12 is grounded, and the main control chip U1 can also control on and off of the third control switch S3 and the fourth control switch S4. When only the third control switch S3 is conducted, only the first load capacitor C11 is connected to the circuit, and when the third control switch S3 and the fourth control switch S4 are conducted simultaneously, both the first load capacitor C11 and the second load capacitor C12 are connected to the circuit, so that the adjustment of the working frequency of the crystal oscillator X1 can be achieved through controlling the third control switch S3 and the fourth control switch S4. It can be understood that the crystal oscillator unit 510 can also increase the branch circuit formed by the load capacitor and the control switch according to actual requirements, or change the serial-parallel connection relationship between each control switch and the load capacitor.

It should be noted that, the second impedance matching unit 410 has no fixed specific circuit structure, and the second impedance matching unit 410 needs to be configured to have a suitable impedance, for example, 50Ω, according to the theory of signal transmission lines, so as to reduce the transmission loss of signals.

Fig. 7 is a schematic diagram of an electronic device according to an embodiment of the present application, and for convenience of explanation, only a portion related to the embodiment is shown, which is described in detail below:

the electronic device 10 comprises a signal transceiving circuit 20 according to any of the embodiments described above.

The electronic device 10 may be a device such as an intelligent doorbell, an intelligent door control, etc., and may communicate with an external device through the signal transceiver circuit 20.

It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions. The functional units and modules in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working process of the units and modules in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.

In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.

The above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.

Claims

1. A signal transceiving circuit, comprising:

the power amplification module is used for amplifying the received first transmission signal to obtain and output a second transmission signal;

the frequency selecting module is connected with the output end of the power amplifying module and is used for carrying out band-pass filtering on the second transmitting signal based on a frequency selecting control signal, and reserving a signal in the second transmitting signal, which corresponds to the frequency selecting control signal, in a frequency band so as to obtain and output a third transmitting signal;

the transmitting module is connected with the output end of the frequency selecting module and is used for generating and transmitting a wireless radio frequency signal based on the third transmitting signal;

the receiving module is coupled with the transmitting module through an electromagnetic field and is used for receiving a wireless radio frequency signal and generating a receiving signal based on the wireless radio frequency signal; wherein the received signal comprises a signal indicator of the wireless radio frequency signal;

and the processing module is connected with the receiving module and the frequency selecting module and is used for outputting the frequency selecting control signal for adjusting the frequency of the third transmitting signal based on the signal index in the receiving signal.

2. The signal transceiving circuit of claim 1, further comprising a level shifting module coupled to an input of the power amplification module, the level shifting module configured to level shift an input transmit signal to generate and output the first transmit signal that matches the power amplification module.

3. The signal transceiving circuit of claim 2, wherein said level shifting module comprises: the first switch tube and the first current limiting resistor;

the first conducting end of the first switching tube is used for receiving the input transmitting signal, the controlled end of the first switching tube is used for being connected with a first power supply, and the second conducting end of the first switching tube is connected with the power amplifying module;

the first end of the first current limiting resistor is used for being connected with a second power supply, and the second end of the first current limiting resistor is connected with the second conducting end of the first switching tube.

4. The signal transceiving circuit of claim 1, wherein the power amplification module comprises: the second switch tube, the second current limiting resistor, the first feedback capacitor, the second feedback capacitor and the first filter capacitor;

the first conducting end of the second switching tube is connected with the frequency selection module, the controlled end of the second switching tube is used for receiving the first transmission signal, the second conducting end of the second switching tube is connected with the first end of the second current limiting resistor, and the second end of the second current limiting resistor is grounded;

the first end of the first feedback capacitor is connected with the first conducting end of the second switching tube, the second end of the first feedback capacitor is connected with the second conducting end of the second switching tube, the first end of the second feedback capacitor is connected with the second end of the first feedback capacitor, the second end of the second feedback capacitor is grounded, the first end of the first filter capacitor is grounded, and the second end of the first filter capacitor is connected with the controlled end of the second switching tube.

5. The signal transceiver circuit of claim 1, wherein the frequency selection module comprises an inductance adjustment unit, a first end of the inductance adjustment unit is connected to the output end of the power amplification module, a second end of the inductance adjustment unit is connected to a third power supply, and the inductance adjustment unit is configured to adjust an inductance between the output end of the power amplification module and the third power supply.

6. The signal transceiving circuit of claim 5, wherein said inductance adjustment unit comprises a plurality of control switches and a plurality of frequency selective inductances; the controlled end of each control switch is connected with the processing module, and the frequency selection control signal is used for controlling the on and off of each control switch;

and one control switch and one frequency-selecting inductor are connected in series between the output end of the power amplification module and the third power supply.

7. The signal transceiver circuit of claim 5, wherein the frequency selection module further comprises a third current limiting resistor connected in series between the inductance adjustment unit and the third power supply, a first end of the third current limiting resistor connected to the third power supply, and a second end of the third current limiting resistor connected to the second end of the inductance adjustment unit.

8. The signal transceiver circuit of claim 1, wherein the transmitting module comprises a first impedance matching unit and a transmitting antenna, a first end of the first impedance matching unit being connected to the frequency selection module, a second end of the first impedance matching unit being connected to the transmitting antenna, the first impedance matching unit being configured to reduce transmission loss of the third transmitting signal, the transmitting antenna being configured to generate and transmit a wireless radio frequency signal based on the third transmitting signal.

9. The signal transceiving circuit according to any of claims 1 to 8, wherein said processing module comprises a main control chip and a crystal oscillator unit;

the crystal oscillator unit is used for configuring the frequency of the receiving signal which can be received by the main control chip, and the main control chip is used for outputting the frequency selection control signal for adjusting the frequency of the third transmitting signal based on the signal index in the receiving signal and adjusting the working frequency of the crystal oscillator unit.

10. An electronic device comprising a signal transceiving circuit according to any of claims 1 to 9.