A radio frequency signal output circuit, method, and electronic device

Abstract

The present disclosure relates to a radio frequency signal output circuit, method and electronic device, the radio frequency signal output circuit comprising: a radio frequency signal input module, a channel switching module, a signal sampling module, a resonant filter network module and a data processing module; the output end of the radio frequency signal input module is electrically connected with the first end of the channel switching module; the second end of the channel switching module is electrically connected with the input end of the signal sampling module and a radio frequency antenna; the channel switching module is further electrically connected with the output end of the resonant filter network module; and the control end of the channel switching module is electrically connected with the control end of the data processing module. The present disclosure can automatically select how to perform harmonic suppression and emission on a radio frequency signal according to the characteristics of the radio frequency signal, can be applied to communication transmission in a plurality of frequency ranges, and improves the application range of the circuit.

Description

Technical Field

[0001] This disclosure relates to the field of wireless communication technology, and in particular to a radio frequency signal output circuit, method, and electronic device. Background Technology

[0002] In cellular mobile communications, the performance of the PA (Power Amplifier) ​​directly determines the quality of the communication signal. As communication signal frequencies increase—from GSM (Global System for Mobile Communications), WCDMA (Wideband Code Division Multiple Access), LTE (Long Term Evolution), and NR (New Radio)—the requirements for PA performance become increasingly stringent, including linearity, efficiency, stability, bandwidth, power, and harmonic suppression.

[0003] In existing RF signal output circuits, the transmission performance of RF signals is poor, and bandwidth and efficiency are affected in order to maintain high linearity. In the prior art, Chinese Patent Publication No. CN104579189A discloses a circuit structure for improving the harmonic performance of an RF power amplifier, including multiple harmonic resonant networks. These resonant networks improve the RF signal output effect, and the harmonic resonant networks are composed of capacitors and inductors.

[0004] It is evident that existing radio frequency signals, when performing harmonic suppression, are only applicable to circuits operating at specific frequencies due to the specific values ​​of capacitance and inductance, and are not suitable for wide-range communication transmission. Summary of the Invention

[0005] To solve the above-mentioned technical problems, or at least partially solve them, this disclosure provides a radio frequency signal output circuit, method, and electronic device that can automatically select how to suppress harmonics and transmit radio frequency signals according to their characteristics, and is applicable to communication transmission in multiple frequency ranges, thereby improving the circuit's applicability.

[0006] In a first aspect, this disclosure provides a radio frequency signal output circuit, comprising:

[0007] The system includes an RF signal input module, a channel switching module, a signal sampling module, a resonant filter network module, and a data processing module.

[0008] The output terminal of the RF signal input module is electrically connected to the first terminal of the channel switching module; the second terminal of the channel switching module is electrically connected to the input terminal of the signal sampling module and the RF antenna; the channel switching module is also electrically connected to the output terminal of the resonant filter network module; the control terminal of the channel switching module is electrically connected to the control terminal of the data processing module; the output terminal of the signal sampling module is electrically connected to the input terminal of the data processing module; multiple output terminals of the data processing module are electrically connected to multiple input terminals of the resonant filter network module; the channel switching module includes a first channel and a second channel; the first channel connects the first terminal and the second terminal of the channel switching module to directly transmit RF signals; the second channel connects the first terminal of the channel switching module to the second terminal of the channel switching module through the resonant filter network module to transmit RF signals.

[0009] The signal sampling module is used to collect the radio frequency signal output by the channel switching module; the data processing module is used to determine whether there is a harmonic spectrum index in the radio frequency signal; and when there is a harmonic spectrum index, it determines the control voltage of the harmonic spectrum index, controls the radio frequency signal input module to output the radio frequency signal to the radio frequency antenna through the second channel of the channel switching module, and applies the control voltage to the resonant filter network module so that the resonant filter network module adjusts the bandwidth of the filter network based on the control voltage.

[0010] In some embodiments, the radio frequency signal input module includes: a radio frequency power amplifier and a matching network;

[0011] The input terminal of the RF power amplifier is electrically connected to the input terminal of the RF signal input module; the output terminal of the RF power amplifier is electrically connected to the input terminal of the matching network; and the output terminal of the matching network is electrically connected to the output terminal of the RF signal input module.

[0012] In some embodiments, the channel switching module includes: a first radio frequency switch and a second radio frequency switch;

[0013] The common terminal of the first RF switch is electrically connected to the first terminal of the channel switching module; the common terminal of the second RF switch is electrically connected to the second terminal of the channel switching module; the first selection terminal of the first RF switch is electrically connected to the first selection terminal of the second RF switch via a wire harness; the second selection terminal of the first RF switch is electrically connected to the second selection terminal of the second RF switch via the resonant filter network module.

[0014] In some embodiments, the signal sampling module includes: a coupler, a mixer, a frequency synthesis signal source, and an acquisition and output module;

[0015] The input terminal of the coupler is electrically connected to the input terminal of the signal sampling module; the first output terminal of the coupler is electrically connected to the radio frequency antenna; the second output terminal of the coupler is electrically connected to the first input terminal of the mixer; the second input terminal of the mixer is electrically connected to the frequency synthesis signal source; the output terminal of the mixer is electrically connected to the input terminal of the acquisition output module; the output terminal of the acquisition output module is electrically connected to the output terminal of the signal sampling module.

[0016] The mixer is used to mix the radio frequency signal output by the coupler with the synthesized signal provided by the frequency synthesis signal source and output the mixed radio frequency signal; the acquisition and output module is used to determine the real part sequence and imaginary part sequence corresponding to the mixed radio frequency signal and send them to the data processing module.

[0017] In some embodiments, the resonant filter network module includes a plurality of resonant filter units; the plurality of resonant filter units are connected in parallel;

[0018] The resonant filtering unit includes a capacitor, an inductor, a crystal filter, and a varactor diode; the first terminal of the capacitor is electrically connected to the first terminal of the inductor; the second terminal of the inductor is electrically connected to the first terminal of the crystal filter; the second terminal of the crystal filter is electrically connected to the first terminal of the varactor diode; the second terminal of the varactor diode is electrically connected to the second terminal of the capacitor; and the control terminal of the varactor diode is electrically connected to the output terminal of the data processing module.

[0019] In some embodiments, the acquisition and output module includes: a voltage follower, a power amplifier, a low-pass filter, an analog-to-digital converter, and a Fourier transform unit;

[0020] The input terminal of the voltage follower is electrically connected to the input terminal of the acquisition output module; the output terminal of the voltage follower is electrically connected to the input terminal of the power amplifier; the output terminal of the power amplifier is electrically connected to the input terminal of the low-pass filter; the output terminal of the low-pass filter is electrically connected to the input terminal of the analog-to-digital converter; the analog-to-digital converter is electrically connected to the input terminal of the Fourier transform unit; the output terminal of the Fourier transform unit is electrically connected to the output terminal of the acquisition output module.

[0021] The analog-to-digital converter is used to acquire the voltage of the mixed radio frequency signal and convert it into a digital signal; the Fourier operation unit is used to perform Fourier transform on the digital signal to acquire the real part sequence and the imaginary part sequence.

[0022] In some embodiments, the data processing module includes a control unit and a voltage output unit;

[0023] The input terminal of the control unit is electrically connected to the output terminal of the signal sampling module; the control unit includes multiple output terminals; the voltage output unit includes multiple input terminals and multiple output terminals; the output terminal of the control unit is connected to the input terminal of the voltage output unit; the output terminal of the voltage output unit is electrically connected to the output terminal of the data processing module.

[0024] The control unit is used to determine the spectrum index based on the real part sequence and the imaginary part sequence, determine whether the radio frequency signal has a spectrum index corresponding to a harmonic; and when a spectrum index corresponding to a harmonic exists, determine the control voltage of the spectrum index corresponding to the harmonic; the voltage output unit is used to output the control voltage to the resonant filter network module.

[0025] In some embodiments, the control unit is used to determine the control voltage corresponding to the spectral index of the harmonic based on a neural network model.

[0026] Secondly, this disclosure also provides a radio frequency signal output method, applicable to any of the radio frequency signal output circuits provided in the first aspect, the method comprising:

[0027] Obtain the radio frequency signal output by the radio frequency signal output circuit;

[0028] Determine whether the radio frequency signal contains harmonics and their corresponding spectral indices;

[0029] If so, determine the control voltage corresponding to the harmonic spectrum index;

[0030] The control RF signal input module outputs an RF signal to the RF antenna through the second channel of the channel switching module and applies the control voltage to the resonant filter network module.

[0031] Thirdly, this disclosure also provides an electronic device including a radio frequency signal output circuit as described in any of the first aspects.

[0032] The technical solution provided in this disclosure has the following advantages compared with the prior art:

[0033] The radio frequency (RF) signal output circuit disclosed herein includes: an RF signal input module, a channel switching module, a signal sampling module, a resonant filter network module, and a data processing module. The signal sampling module collects the RF signal output from the channel switching module. The data processing module determines whether the RF signal contains harmonic spectral indices, and if so, determines the control voltage for those indices. This control voltage is then applied to the RF signal input module via the second channel of the channel switching module to output the RF signal to the RF antenna, and to the resonant filter network module to adjust its bandwidth based on the control voltage. The RF signal is transmitted via the RF signal input module, collected by the signal sampling module after passing through the first channel, and processed and analyzed by the data processing module. If harmonic suppression is required, the channel switching module is switched to the second channel, allowing the RF signal to be suppressed by the resonant filter network before transmission, thus completing the RF signal output. This disclosure can automatically select how to suppress harmonics and transmit the RF signal based on its characteristics, and is applicable to communication transmission across multiple frequency ranges, thus improving the circuit's applicability. Attached Figure Description

[0034] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0035] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of the structure of a radio frequency signal output circuit provided in an embodiment of the present disclosure;

[0037] Figure 2 A schematic diagram of another radio frequency signal output circuit provided in this embodiment of the present disclosure;

[0038] Figure 3 A schematic diagram of another radio frequency signal output circuit provided in this embodiment of the present disclosure;

[0039] Figure 4 A schematic diagram of another radio frequency signal output circuit provided in this embodiment of the present disclosure;

[0040] Figure 5 A schematic diagram of another radio frequency signal output circuit provided in this embodiment of the present disclosure;

[0041] Figure 6A schematic diagram of another radio frequency signal output circuit provided in this embodiment of the present disclosure;

[0042] Figure 7 A schematic diagram of another radio frequency signal output circuit provided in this embodiment of the present disclosure;

[0043] Figure 8 This is a flowchart illustrating a radio frequency signal output method provided in an embodiment of the present disclosure. Detailed Implementation

[0044] To better understand the above-mentioned objectives, features, and advantages of this disclosure, the solutions disclosed herein will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0045] Numerous specific details are set forth in the following description in order to provide a full understanding of this disclosure, but this disclosure may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some, and not all, of the embodiments of this disclosure.

[0046] Figure 1 This is a schematic diagram of a radio frequency signal output circuit provided in an embodiment of this disclosure. Figure 1 As shown, the radio frequency signal output circuit includes: a radio frequency signal input module 10, a channel switching module 20, a signal sampling module 30, a resonant filter network module 40, and a data processing module 50.

[0047] The output terminal of the RF signal input module 10 is electrically connected to the first terminal of the channel switching module 20. The second terminal of the channel switching module 20 is electrically connected to the input terminal of the signal sampling module 30 and the RF antenna 60. The channel switching module 20 is also electrically connected to the output terminal of the resonant filter network module 40. The control terminal of the channel switching module 20 is electrically connected to the control terminal of the data processing module 50. The output terminal of the signal sampling module 30 is electrically connected to the input terminal of the data processing module 50. Multiple output terminals of the data processing module 50 are electrically connected to multiple input terminals of the resonant filter network module 40. The channel switching module 20 includes a first channel and a second channel. The first channel connects the first terminal and the second terminal of the channel switching module 20 to directly transmit RF signals. The second channel connects the first terminal and the second terminal of the channel switching module 20 through the resonant filter network module 40 to transmit RF signals.

[0048] The signal sampling module 30 is used to collect the radio frequency signal output by the channel switching module 20. The data processing module 50 is used to determine whether there is a harmonic spectrum index in the radio frequency signal, and when there is a harmonic spectrum index, to determine the control voltage of the harmonic spectrum index, and to control the radio frequency signal input module 10 to output the radio frequency signal to the radio frequency antenna 60 through the second channel of the channel switching module 20, and to apply the control voltage to the resonant filter network module 40 so that the resonant filter network module 40 adjusts the bandwidth of the filter network based on the control voltage.

[0049] Specifically, the output terminal of the RF signal input module 10 is electrically connected to the first terminal of the channel switching module 20, and the RF signal input module 10 sends the generated RF signal to the channel switching module 20. The second terminal of the channel switching module 20 is electrically connected to the input terminal of the signal sampling module 30 and the RF antenna 60, allowing the RF signal to be transmitted to the signal sampling module 30 or directly transmitted outward by the RF antenna 60. Simultaneously, the channel switching module 20 is also electrically connected to the output terminal of the resonant filter network module 40, and the control terminal of the channel switching module 20 is electrically connected to the control terminal of the data processing module 50. The channel switching module 20 includes a first channel and a second channel, both of which are channels for transmitting RF signals. Under the control of the data processing module 50, the channel is selected to be active. Specifically, the first channel, consisting of the connection between the first and second terminals of the channel switching module 20, directly transmits the RF signal through the RF signal input module 10. The second channel, consisting of the connection between the first and second terminals of the channel switching module 20 and the resonant filter network module 40, transmits the RF signal. The output of the signal sampling module 30 is electrically connected to the input of the data processing module 50. The signal sampling module 30 transmits the collected information to the data processing module 50, which performs calculations and determines whether harmonic suppression is required. Multiple outputs of the data processing module 50 are electrically connected to multiple inputs of the resonant filter network module 40. If harmonic suppression is required, a control voltage is sent to the input of the resonant filter network module 40.

[0050] The signal sampling module 30 is used to collect the radio frequency (RF) signal output by the channel switching module 20. The signal sampling module 30 converts the collected RF signal into corresponding sequence information and sends it to the data processing module 50. The data processing module 50 is used to determine whether the RF signal contains a harmonic spectral index. If a harmonic spectral index exists, it determines the control voltage for the harmonic spectral index, controls the RF signal input module 10 to output the RF signal to the RF antenna 60 through the second channel of the channel switching module 20, and applies the control voltage to the resonant filter network module 40 so that the resonant filter network module 40 adjusts the bandwidth of the filter network based on the control voltage. If no harmonic spectral index exists, harmonic suppression is not required, and the channel switching module 20 outputs the RF signal to the RF antenna 60 through the first channel.

[0051] In this embodiment, the radio frequency (RF) signal is transmitted via the RF signal input module, acquired by the signal sampling module after passing through the first channel, and processed and analyzed by the data processing module. If harmonic suppression is required, the channel switching module switches to the second channel, allowing the RF signal to be suppressed by the resonant filter network before transmission, thus completing the RF signal output. This disclosure can automatically select how to suppress harmonics and transmit the RF signal based on its characteristics, and is applicable to communication transmission in various frequency ranges, improving the circuit's applicability.

[0052] In some embodiments, Figure 2 A schematic diagram of another radio frequency signal output circuit provided in this disclosure embodiment is shown below. Figure 2 As shown, the radio frequency signal input module 10 includes: a radio frequency power amplifier 11 and a matching network 12.

[0053] The input terminal of the RF power amplifier 11 is electrically connected to the input terminal of the RF signal input module 10, the output terminal of the RF power amplifier 11 is electrically connected to the input terminal of the matching network 12, and the output terminal of the matching network 12 is electrically connected to the output terminal of the RF signal input module 10.

[0054] Specifically, the input terminal of the RF power amplifier 11 is electrically connected to the input terminal of the RF signal input module 10, and the RF signal can be transmitted to the RF power amplifier 11. The output terminal of the RF power amplifier 11 is electrically connected to the input terminal of the matching network 12, and the RF power amplifier 11 transmits the RF signal after amplification to the matching network 12.

[0055] The radio frequency (RF) power amplifier amplifies low-power RF signals to obtain sufficiently high RF output power for transmission via an antenna. Simultaneously, a matching network is incorporated to achieve optimal power matching between the RF power amplifier's input and output, enabling maximum power transfer over a wide bandwidth. It should be noted that the matching network can be composed of electronic components such as capacitors and inductors; this disclosure does not limit the circuit configuration of the matching network.

[0056] In some embodiments, Figure 3 Another radio frequency signal transmission method provided in the embodiments of this disclosure

[0057] A schematic diagram of the output circuit is shown below. Figure 3 As shown, the channel switching module 20 includes: a first radio frequency switch 21 and a second radio frequency switch 22.

[0058] The common terminal of the first RF switch 21 is electrically connected to the first terminal of the channel switching module 20.

[0059] The common terminal of the second RF switch 22 is electrically connected to the second terminal of the channel switching module 20, and the first selection terminal of the first RF switch 21 is connected to the first selection terminal of the second RF switch 22 via a wiring harness.

[0060] Electrically connected, the second selector terminal of the first RF switch 21 is electrically connected to the second selector terminal of the second RF switch 22 through the resonant filter network module 40.

[0061] Specifically, the common terminal of the first RF switch 21 is electrically connected to the first terminal of the channel switching module 20, and the RF signal is input from the common terminal of the first RF switch 21. The common terminal of the second RF switch 22 is electrically connected to the second terminal of the channel switching module 20, and the RF signal is output from the common terminal of the second RF switch 22.

[0062] 5. The first radio frequency switch 21 includes a first selection terminal and a second selection terminal of the first radio frequency switch.

[0063] The second RF switch 22 also includes a first selector terminal and a second selector terminal. The first selector terminal of the first RF switch 21 and the first selector terminal of the second RF switch are directly electrically connected via a wiring harness. When this path is open, the RF signal is directly transmitted through the wiring harness.

[0064] The signal is transmitted to the first select terminal of the second RF switch and output. The second select terminal 0 of the first RF switch 21 is electrically connected to the second select terminal of the second RF switch 22 via the resonant filter network module 40.

[0065] When this path is activated, the radio frequency signal in the resonant filter network module 40 will be output through the second selection terminal of the second radio frequency switch 22. The channel switching module 20 includes two radio frequency signal transmission paths, and the first radio frequency switch 21 and the second radio frequency switch 22 are controlled by the data processing module 50.

[0066] The transmission path to be turned on is selected, for example, when harmonic suppression is not required, the first selector terminal of the first RF switch 21 and the first selector terminal of the second RF switch 22 are selected to be turned on; when

[0067] When harmonic suppression is required, the second selector terminal of the first RF switch 21 and the second selector terminal of the second RF switch 22 are selected and turned on.

[0068] In some embodiments, Figure 4 A schematic diagram of another radio frequency signal output circuit provided in this disclosure embodiment is shown below. Figure 4 As shown, the signal sampling module 30 includes: a coupler 31, a mixer 32, a frequency synthesis signal source 33, and an acquisition and output module 34.

[0069] The input terminal of coupler 31 is electrically connected to the input terminal of signal sampling module 30, the first output terminal of coupler 31 is electrically connected to radio frequency antenna 60, the second output terminal of coupler 31 is electrically connected to the first input terminal of mixer 32, the second input terminal of mixer 32 is electrically connected to frequency synthesis signal source 33, the output terminal of mixer 32 is electrically connected to the input terminal of acquisition output module 34, and the output terminal of acquisition output module 34 is electrically connected to the output terminal of signal sampling module 30.

[0070] The mixer 32 is used to mix the radio frequency signal output by the coupler 31 with the synthesized signal provided by the frequency synthesizing signal source 33 and output the mixed radio frequency signal. The acquisition output module 34 is used to determine the real part sequence and imaginary part sequence corresponding to the mixed radio frequency signal and send them to the data processing module 50.

[0071] In this embodiment, the input terminal of coupler 31 is electrically connected to the input terminal of signal sampling module 30 to couple radio frequency (RF) signals. Coupler 31 includes a first output terminal and a second output terminal. The first output terminal is electrically connected to RF antenna 60, and the second output terminal is electrically connected to the first input terminal of mixer 32. The RF signal can be transmitted through RF antenna 60 or transmitted to mixer 32 through the second output terminal. The second input terminal of mixer 32 is electrically connected to frequency synthesis signal source 33. Since mobile phone communication transmission mainly uses high-frequency RF signals, high-frequency signals are not easy to directly acquire during signal sampling, resulting in low acquisition accuracy. Therefore, a synthesized signal is input into mixer 32 through frequency synthesis signal source 33, so that the RF signal output by coupler 31 and the synthesized signal provided by frequency synthesis signal source 33 are mixed in mixer 32, and the mixed RF signal is output to acquisition output module 34. The input terminal of the acquisition output module 34 is electrically connected to the input terminal of the mixer 32. The acquisition output module 34 acquires the mixed radio frequency signal, calculates and determines the real part sequence and imaginary part sequence corresponding to the mixed radio frequency signal, and sends it to the data processing module 50.

[0072] In some embodiments, Figure 5 A schematic diagram of another radio frequency signal output circuit provided in this disclosure embodiment is shown below. Figure 5 As shown, the resonant filter network module 40 includes multiple resonant filter units 41, which are connected in parallel.

[0073] The resonant filter unit 41 includes a capacitor, an inductor, a crystal filter, and a varactor diode; the first end of the capacitor is electrically connected to the first end of the inductor, the second end of the inductor is electrically connected to the first end of the crystal filter, the second end of the crystal filter is electrically connected to the first end of the varactor diode, the second end of the varactor diode is electrically connected to the second end of the capacitor, and the control end of the varactor diode is electrically connected to the output end of the data processing module.

[0074] Specifically, the resonant filter network module 40 is equipped with multiple resonant filter units 41 connected in parallel. Capacitors, inductors, and crystal filters can adjust the impedance and filtering characteristics of the resonant filter units, improving circuit stability and transmission efficiency. The control terminal of the varactor diode is electrically connected to the output terminal of the data processing module 50. The data processing module 50 outputs a corresponding control voltage to the varactor diode. Changes in the control voltage alter the capacitance value of the varactor diode, thereby changing the quality factor of the resonant filter unit 41. A higher quality factor indicates better circuit selectivity. Since the quality factor is controlled by the resistors and inductors or capacitors in the resonant circuit, with a fixed capacitance and inductance, the quality factor of the resonant filter network unit can be changed by altering the capacitance value of the varactor diode. If the capacitance and inductance values ​​are determined, the resonant frequency is fixed, and the bandwidth can be changed by altering the quality factor, allowing some signals to pass through and achieving harmonic suppression.

[0075] In some embodiments, continue to refer to Figure 4 The acquisition and output module 34 includes: a voltage follower 341, a power amplifier 342, a low-pass filter 343, an analog-to-digital converter 344, and a Fourier operation unit 345.

[0076] The input terminal of voltage follower 341 is electrically connected to the input terminal of the acquisition output module. The output terminal of voltage follower 341 is electrically connected to the input terminal of power amplifier 342. The output terminal of power amplifier 342 is electrically connected to the input terminal of low-pass filter 343. The output terminal of low-pass filter 343 is electrically connected to the input terminal of analog-to-digital converter 344. Analog-to-digital converter 344 is electrically connected to the input terminal of Fourier operation unit 345. The output terminal of Fourier operation unit 345 is electrically connected to the output terminal of the acquisition output module.

[0077] The analog-to-digital converter 344 is used to acquire the voltage of the mixed radio frequency signal and convert it into a digital signal. The Fourier operation unit 345 is used to perform Fourier transform on the digital signal to acquire the real part sequence and the imaginary part sequence.

[0078] In this embodiment, the radio frequency signal output by the mixer 32 is transmitted to the voltage follower 341. The voltage follower 341 ensures that the voltage signal of the radio frequency signal is always within the positive voltage range, ensuring more comprehensive sampling data and avoiding inaccurate sampling when negative voltages occur, thus preventing missed sampling and affecting the accuracy of data acquisition. After the power amplifier 342 amplifies the acquired voltage signal, the low-pass filter 343 filters the high-frequency part to maintain the accuracy and stability of the acquired data. The low-pass filter 343 transmits the filtered voltage signal to the analog-to-digital converter 344, which converts it into a digital signal and sends it to the Fourier operation unit 345. The Fourier operation unit 345 performs a discrete Fourier transform on the sampled data to obtain information such as the real part sequence and the imaginary part sequence.

[0079] Optionally, it also includes a signal transmission unit, the input of which is electrically connected to the output of the Fourier transform unit, and the output of which is connected to the input of the data processing module. For example, it can be transmitted using the IIC (Inter-Integrated Circuit) communication protocol, or other communication transmission methods can be used.

[0080] In some embodiments, Figure 6 A schematic diagram of another radio frequency signal output circuit provided in this disclosure embodiment is shown below. Figure 6 As shown, the data processing module 50 includes a control unit 51 and a voltage output unit 52.

[0081] The input terminal of the control unit 51 is electrically connected to the output terminal of the signal sampling module 30. The control unit 51 includes multiple output terminals. The voltage output unit 52 includes multiple input terminals and multiple output terminals. The output terminal of the control unit 51 is connected to the input terminal of the voltage output unit 52. The output terminal of the voltage output unit 52 is electrically connected to the output terminal of the data processing module 50.

[0082] The control unit 51 is used to determine the spectral index based on the real part sequence and the imaginary part sequence, determine whether there is a spectral index corresponding to a harmonic in the radio frequency signal, and determine the control voltage of the spectral index corresponding to the harmonic when there is a spectral index corresponding to a harmonic. The voltage output unit 52 is used to output the control voltage to the resonant filter network module 40.

[0083] Specifically, the control unit 51 in the data processing module 50 receives the Fourier-transformed information transmitted by the signal sampling module 30 and calculates and processes it based on the received real and imaginary part sequences to obtain spectral indicators, such as harmonics, switching spectrum, modulation spectrum, and conducted spurious emissions. Since different radio frequency (RF) signals correspond to different spectral indicators, the control unit 51 can determine the type of the acquired RF signal by comparing the spectral indicators and determine whether the RF signal has spectral indicators corresponding to harmonics. If spectral indicators corresponding to harmonics exist, the control unit 51 determines the control voltage corresponding to suppressing harmonic output and transmits it through the output terminal of the control unit 51 to the input terminal of the voltage output unit 52. The voltage output unit 52 then outputs the control voltage to the resonant filter network module 40 to suppress harmonics. The multiple output terminals of the voltage output unit 52 are not shown in the figure. It should be noted that the number of harmonic units in the harmonic network module is set according to actual needs; if multiple harmonics need to be suppressed, the number of harmonic units can be increased.

[0084] In some embodiments, the control unit is used to determine the control voltage corresponding to the spectral index of the harmonic based on a neural network model.

[0085] In this embodiment, the control unit determines the control voltage corresponding to the harmonic's spectral index using a pre-set neural network model. Exemplarily, the neural network model includes a neural network input layer, a neural network hidden layer, and a neural network output layer. If five input / output terminals are provided, the neural network input layer includes five neurons for selecting the amplitude information of the frequency, fundamental wave, second harmonic, third harmonic, and fifth harmonic. The neural network hidden layer includes multiple neurons, and the neural network output layer outputs the control voltage signal to the voltage output unit. The neural network signal travels from the neural network input layer through the neural network hidden layer until it reaches the neural network output layer, generating the control voltage output signal. The state of each neuron only affects the state of the neuron in the next layer.

[0086] An adaptive harmonic control model can be established based on a neural network model using a certain amount of test data and signal condition parameters. After multiple training iterations, the neural network model will describe the changing trend of the training sample data in the form of a curve. Similarly, as long as the values ​​of the neural network training sample data are within the range, the adaptive harmonic suppression can be accurately controlled. That is, the bandwidth of the resonant filter unit is changed by matching the output control voltage according to the obtained spectrum index, thereby completing the harmonic suppression.

[0087] For example, Figure 7 This is a schematic diagram of another radio frequency signal output circuit provided in an embodiment of the present disclosure. Figure 8 This is a flowchart illustrating a radio frequency signal output method provided in an embodiment of the present disclosure, as shown below. Figure 7 and Figure 8 As shown, this disclosure also provides a radio frequency signal output method, applicable to any of the radio frequency signal output circuits provided in the above embodiments, the method comprising S110 to S140:

[0088] S110, Obtain the radio frequency signal output by the radio frequency signal output circuit.

[0089] The radio frequency signal input module 10 transmits the radio frequency signal to the channel switching module 20. Under the control of the data processing module 50, the channel switching module 20 turns on the first select terminal of the first radio frequency switch 21 and the first select terminal of the second radio frequency switch 22. The radio frequency signal passes through the signal sampling module 30, and the output radio frequency signal can be obtained at this time.

[0090] S120. Determine if the radio frequency signal contains harmonics and corresponding spectral indicators. If yes, proceed to S130.

[0091] The data processing module 50 processes the radio frequency (RF) signal, obtains the corresponding spectral index, and compares the obtained spectral index with the pre-set spectral index corresponding to harmonics. If no spectral index corresponding to harmonics exists, harmonic suppression is not required, the current connection method is maintained, and the RF signal can be directly output by the RF antenna. If a spectral index corresponding to harmonics exists, it indicates the presence of harmonic interference, and harmonic suppression is required, thus executing step S130.

[0092] S130, Determine the control voltage corresponding to the spectrum index of the harmonic.

[0093] Within the data processing module 50, a neural network model can be used to determine the control voltage corresponding to the spectral index of the harmonic, and the harmonic can be suppressed by controlling the voltage.

[0094] S140, the control RF signal input module outputs RF signals to the RF antenna through the second channel of the channel switching module, and applies control voltage to the resonant filter network module.

[0095] After determining the spectral index corresponding to the presence of harmonics, the data processing module 50 will switch in conjunction with the channel switching module, turning on the second selector terminal of the first RF switch 21 and the second selector terminal of the second RF switch 22, and applying the determined control voltage to the resonant filter network module 40. The multiple resonant filter units 41 in the resonant filter network module 40 are affected by the control voltage, and their quality factors change, thereby changing the bandwidth. As a result, the harmonics in the RF signal are suppressed and cannot pass through. Only the required RF signal can be transmitted to the RF antenna, and the remaining harmonics are suppressed and intercepted.

[0096] This disclosure also provides an electronic device, including any of the radio frequency signal output circuits provided in the above embodiments, which have the same or similar beneficial effects, and will not be described in detail here.

[0097] In other embodiments, the electronic device may also include other structural or functional components known to those skilled in the art, which will not be elaborated upon or limited herein.

[0098] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0099] The above description is merely a specific embodiment of this disclosure, enabling those skilled in the art to understand or implement it. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this disclosure. Therefore, this disclosure is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A radio frequency signal output circuit, characterized in that, include: The system includes an RF signal input module, a channel switching module, a signal sampling module, a resonant filter network module, and a data processing module. The output terminal of the RF signal input module is electrically connected to the first terminal of the channel switching module; the second terminal of the channel switching module is electrically connected to the input terminal of the signal sampling module and the RF antenna; the channel switching module is also electrically connected to the output terminal of the resonant filter network module; the control terminal of the channel switching module is electrically connected to the control terminal of the data processing module; the output terminal of the signal sampling module is electrically connected to the input terminal of the data processing module; multiple output terminals of the data processing module are electrically connected to multiple input terminals of the resonant filter network module; the channel switching module includes a first channel and a second channel; the first channel connects the first terminal and the second terminal of the channel switching module to directly transmit RF signals; the second channel connects the first terminal of the channel switching module to the second terminal of the channel switching module through the resonant filter network module to transmit RF signals. The signal sampling module is used to collect the radio frequency signal output by the channel switching module; the data processing module is used to determine whether the radio frequency signal has a spectrum index corresponding to harmonics; and when a spectrum index corresponding to harmonics exists, it determines the control voltage of the spectrum index corresponding to the harmonics, controls the radio frequency signal input module to output the radio frequency signal to the radio frequency antenna through the second channel of the channel switching module, and applies the control voltage to the resonant filter network module so that the resonant filter network module adjusts the bandwidth of the filter network based on the control voltage; The resonant filter network module includes multiple resonant filter units; the multiple resonant filter units are connected in parallel. The resonant filtering unit includes a capacitor, an inductor, a crystal filter, and a varactor diode; the first terminal of the capacitor is electrically connected to the first terminal of the inductor; the second terminal of the inductor is electrically connected to the first terminal of the crystal filter; the second terminal of the crystal filter is electrically connected to the first terminal of the varactor diode; the second terminal of the varactor diode is electrically connected to the second terminal of the capacitor; the control terminal of the varactor diode is electrically connected to the output terminal of the data processing module. The data processing module includes a control unit and a voltage output unit; The input terminal of the control unit is electrically connected to the output terminal of the signal sampling module; the control unit includes multiple output terminals; the voltage output unit includes multiple input terminals and multiple output terminals; the output terminal of the control unit is connected to the input terminal of the voltage output unit; the output terminal of the voltage output unit is electrically connected to the output terminal of the data processing module. The control unit is used to determine the spectrum index based on the real part sequence and the imaginary part sequence, determine whether the radio frequency signal has a spectrum index corresponding to a harmonic; and when a spectrum index corresponding to a harmonic exists, determine the control voltage of the spectrum index corresponding to the harmonic; the voltage output unit is used to output the control voltage to the resonant filter network module. The control unit is used to determine the control voltage corresponding to the spectral index of the harmonics based on a neural network model.

2. The radio frequency signal output circuit according to claim 1, characterized in that, The radio frequency signal input module includes: a radio frequency power amplifier and a matching network; The input terminal of the RF power amplifier is electrically connected to the input terminal of the RF signal input module; the output terminal of the RF power amplifier is electrically connected to the input terminal of the matching network; and the output terminal of the matching network is electrically connected to the output terminal of the RF signal input module.

3. The radio frequency signal output circuit according to claim 1, characterized in that, The channel switching module includes: a first radio frequency switch and a second radio frequency switch; The common terminal of the first RF switch is electrically connected to the first terminal of the channel switching module; the common terminal of the second RF switch is electrically connected to the second terminal of the channel switching module; the first selection terminal of the first RF switch is electrically connected to the first selection terminal of the second RF switch via a wire harness; the second selection terminal of the first RF switch is electrically connected to the second selection terminal of the second RF switch via the resonant filter network module.

4. The radio frequency signal output circuit according to claim 1, characterized in that, The signal sampling module includes: a coupler, a mixer, a frequency synthesis signal source, and an acquisition and output module; The input terminal of the coupler is electrically connected to the input terminal of the signal sampling module; the first output terminal of the coupler is electrically connected to the radio frequency antenna; the second output terminal of the coupler is electrically connected to the first input terminal of the mixer; the second input terminal of the mixer is electrically connected to the frequency synthesis signal source; the output terminal of the mixer is electrically connected to the input terminal of the acquisition output module; the output terminal of the acquisition output module is electrically connected to the output terminal of the signal sampling module. The mixer is used to mix the radio frequency signal output by the coupler with the synthesized signal provided by the frequency synthesis signal source and output the mixed radio frequency signal; the acquisition and output module is used to determine the real part sequence and imaginary part sequence corresponding to the mixed radio frequency signal and send them to the data processing module.

5. The radio frequency signal output circuit according to claim 4, characterized in that, The acquisition and output module includes: a voltage follower, a power amplifier, a low-pass filter, an analog-to-digital converter, and a Fourier transform unit; The input terminal of the voltage follower is electrically connected to the input terminal of the acquisition output module; the output terminal of the voltage follower is electrically connected to the input terminal of the power amplifier; the output terminal of the power amplifier is electrically connected to the input terminal of the low-pass filter; the output terminal of the low-pass filter is electrically connected to the input terminal of the analog-to-digital converter; the analog-to-digital converter is electrically connected to the input terminal of the Fourier transform unit; the output terminal of the Fourier transform unit is electrically connected to the output terminal of the acquisition output module. The analog-to-digital converter is used to acquire the voltage of the mixed radio frequency signal and convert it into a digital signal; the Fourier operation unit is used to perform Fourier transform on the digital signal to acquire the real part sequence and the imaginary part sequence.

6. A method for outputting radio frequency signals, characterized in that, The method, applicable to the radio frequency signal output circuit of any one of claims 1-5, comprises: Obtain the radio frequency signal output by the radio frequency signal output circuit; Determine whether the radio frequency signal contains harmonics and their corresponding spectral indices; If so, determine the control voltage corresponding to the harmonic spectrum index; The control RF signal input module outputs an RF signal to the RF antenna through the second channel of the channel switching module and applies the control voltage to the resonant filter network module.

7. An electronic device, characterized in that, Includes the radio frequency signal output circuit as described in any one of claims 1-5.

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