CN-122026928-A - Switching circuit and switching method of broadband radio frequency link

CN122026928ACN 122026928 ACN122026928 ACN 122026928ACN-122026928-A

Abstract

The invention relates to the technical field of radio frequency, in particular to a switching circuit and a switching method of a broadband radio frequency link, wherein the switching circuit comprises a radio frequency input end and a radio frequency link processing circuit, the radio frequency link processing circuit comprises a radio frequency signal processing module, a controller and a radio frequency switch link, a first end of the radio frequency signal processing module is connected with a first end of the radio frequency input end, a second end of the radio frequency signal processing module is connected with one end of the controller, the other end of the controller is connected with the radio frequency switch link, and the controller determines a radio frequency range according to a digital signal sent by the radio frequency signal processing module and a mapping relation calibrated in advance so as to control the radio frequency switch link to be switched to a target radio frequency link matched with the radio frequency range.

Inventors

PAN SONG
ZHANG HAOHAI
DING YUANXIN
LIU YU
JIA CHAO

Assignees

深南电路股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260108

Claims (10)

1. The switching circuit of the broadband radio frequency link is characterized by comprising a radio frequency input end and a radio frequency link processing circuit, wherein the radio frequency link processing circuit comprises a radio frequency signal processing module, a controller and a radio frequency switch link; The first end of the radio frequency signal processing module is connected with the first end of the radio frequency input end, the second end of the radio frequency signal processing module is connected with one end of the controller, and the other end of the controller is connected with the radio frequency switch link; the radio frequency input end is used for receiving radio frequency signals with different frequencies, so that the radio frequency signal processing module performs signal processing on the radio frequency signals to obtain digital signals, and the digital signals are input to the controller; the controller is used for determining a radio frequency range according to the digital signal and a pre-calibrated mapping relation, and controlling the radio frequency switch link to be switched to a target radio frequency link matched with the radio frequency range according to the radio frequency range, wherein the radio frequency switch link comprises a plurality of radio frequency links, and the mapping relation is the corresponding relation between the pre-calibrated digital signal and the radio frequency range.
2. The switching circuit of the broadband radio frequency link as claimed in claim 1, wherein the radio frequency switch link further comprises a radio frequency single pole multi-throw switch, a common end of the radio frequency single pole multi-throw switch is connected with a second end of the radio frequency input end, output ends of the radio frequency single pole multi-throw switch are respectively connected with each radio frequency link, and a control end of the radio frequency single pole multi-throw switch is connected with one end of the controller; the radio frequency single-pole multi-throw switch is used for receiving a switching control instruction and switching to a target radio frequency link matched with the current radio frequency range according to the switching control instruction.
3. The switching circuit of the broadband radio frequency link according to claim 1, wherein the radio frequency signal processing module comprises a weak coupling module, a power amplification module, an ALC module, an equalizer module, a radio frequency detection module, a signal processing module, and an ADC module; One end of the weak coupling module is connected with the first end of the radio frequency input end, the other end of the weak coupling module is connected with one end of the power amplification module, the other end of the power amplification module is connected with one end of the ALC module, the other end of the ALC module is connected with one end of the equalizer module, the other end of the equalizer module is connected with one end of the radio frequency detection module, the other end of the radio frequency detection module is connected with one end of the signal processing module, the other end of the signal processing module is connected with one end of the ADC module, and the other end of the ADC module is connected with one end of the controller; the weak coupling module is used for carrying out power weak coupling on the radio frequency signals to obtain weak coupling signals; the power amplification module is used for amplifying the weak coupling signal to obtain an amplified signal; The ALC module is used for detecting an error signal of the amplified signal and a preset signal amplitude set value, and adjusting circuit parameters according to the error signal to obtain a reference signal; the equalizer module is used for performing frequency-amplitude conversion on the reference signal to obtain a radio frequency amplitude signal; The radio frequency detection module is used for carrying out linear detection on the radio frequency amplitude signal to obtain a voltage signal; the signal processing module is used for carrying out filtering denoising and amplitude amplification processing on the voltage signal to obtain a processed voltage signal; The ADC module is used for converting the processed voltage signal into a digital signal.
4. The switching circuit of a broadband radio frequency link according to claim 3, wherein the weak coupling signal is calculated by the formula: wherein C is represented as a capacitance value and f is represented as a frequency of the radio frequency signal.
5. The switching circuit of the wideband radio frequency link of claim 3, wherein the ALC block includes an automatic gain control chip.
6. The switching circuit of the wideband radio frequency link of claim 3, wherein the equalizer module comprises a capacitor, a first resistor, a second resistor, and an inductor, a first end of the capacitor is connected to the other end of the ALC module, a first end of the capacitor is connected to one end of the first resistor, a third end of the capacitor is connected to one end of the radio frequency detection module, a fourth end of the capacitor is connected to one end of the second resistor, the other end of the first resistor and the other end of the second resistor are connected to one end of the inductor, respectively, and the other end of the inductor is grounded.
7. A switching circuit for a broadband radio frequency link according to claim 3, wherein said processed voltage signal is calculated by the formula: Wherein, the Represented as the slope of the detected wave, Represented as a magnification factor and is shown in the drawing, Represented as a voltage signal and is represented by a reference numeral, Represented as a radio frequency amplitude signal, Represented as a reference signal and is provided by a reference signal, Represented as an attenuation function of the equalizer module at frequency x.
8. The switching circuit of the broadband radio frequency link according to claim 3, wherein the signal processing module includes a low-pass filtering sub-module for filtering high-frequency interference signals in the voltage signal and an operational amplification sub-module for amplifying the filtered voltage signal to an effective detection range of the ADC module.
9. A method for switching a broadband radio frequency link, based on the switching circuit of the broadband radio frequency link according to any one of claims 1 to 8, characterized by comprising: Receiving digital signals sent by the radio frequency signal processing module, wherein the digital signals are obtained by performing signal processing on radio frequency signals with different frequencies; determining a radio frequency range according to the digital signal and a pre-calibrated mapping relation, wherein the mapping relation is a corresponding relation between the pre-calibrated digital signal and the radio frequency range; And controlling the radio frequency switch link to be switched to a target radio frequency link matched with the radio frequency range according to the radio frequency range, wherein the radio frequency switch link comprises a plurality of radio frequency links.
10. The method for switching a wideband rf link of claim 9, wherein the digital signal is obtained by signal processing of rf signals of different frequencies, the rf signal processing module includes a weak coupling module, a power amplification module, an ALC module, an equalizer module, a radio frequency detection module, a signal processing module, and an ADC module, and includes: Performing power weak coupling on the radio frequency signals through the weak coupling module to obtain weak coupling signals; amplifying the weak coupling signal through the power amplifying module to obtain an amplified signal; detecting an error signal of the amplified signal and a preset signal amplitude set value through the ALC module, and adjusting circuit parameters according to the error signal to obtain a reference signal; performing frequency-amplitude conversion on the reference signal through the equalizer module to obtain a radio frequency amplitude signal; performing linear detection on the radio frequency amplitude signal through the radio frequency detection module to obtain a voltage signal; the signal processing module is used for carrying out filtering denoising and amplitude amplification processing on the voltage signal to obtain a processed voltage signal; And the ADC module is used for converting the processed voltage signal into a digital signal.

Description

Switching circuit and switching method of broadband radio frequency link Technical Field The present invention relates to the field of radio frequency technologies, and in particular, to a switching circuit and a switching method for a broadband radio frequency link. Background In a broadband radio frequency application system, the radio frequency bandwidth generally spans multiple octaves (such as 1-20 mhz and 100 mhz-1 ghz) and is limited by the performance of radio frequency devices (such as transistors and filters), a single channel radio frequency link is difficult to meet key index requirements such as gain flatness, noise coefficient and linearity in a full frequency band, and the condition that low-frequency or high-frequency interference signals are inconsistent exists, so that the single link cannot adapt to the anti-interference requirement of the full frequency band is further caused. However, in the prior art, a segmented link scheme is adopted to divide a broadband into a plurality of sub-bands, each sub-band corresponds to an independent radio frequency link, and then a matched link is selected according to the frequency of an actual input signal. For example, in a 1-20 MHz phase shifter circuit, two links of 1-10MHz and 10-20MHz can be respectively subjected to phase shifting treatment, but the link switching control needs an additional control signal channel to transmit a control command to select a radio frequency link, so that obvious defects exist, the accuracy of radio frequency link switching is reduced, and the reliability of a system is affected. Disclosure of Invention Based on this, it is necessary to provide a switching circuit and a switching method for a broadband radio frequency link according to the technical problem, which can complete the radio frequency link switching according to the actually input radio frequency signal frequency without an external control command, simplify the system design, and improve the accuracy of the radio frequency link switching. A first aspect of an embodiment of the present application provides a switching circuit for a broadband radio frequency link, where the switching circuit includes a radio frequency input end and a radio frequency link processing circuit, where the radio frequency link processing circuit includes a radio frequency signal processing module, a controller, and a radio frequency switch link; The first end of the radio frequency signal processing module is connected with the first end of the radio frequency input end, the second end of the radio frequency signal processing module is connected with one end of the controller, and the other end of the controller is connected with the radio frequency switch link; the radio frequency input end is used for receiving radio frequency signals with different frequencies, so that the radio frequency signal processing module performs signal processing on the radio frequency signals to obtain digital signals, and the digital signals are input to the controller; the controller is used for determining a radio frequency range according to the digital signal and a pre-calibrated mapping relation, and controlling the radio frequency switch link to be switched to a target radio frequency link matched with the radio frequency range according to the radio frequency range, wherein the radio frequency switch link comprises a plurality of radio frequency links, and the mapping relation is the corresponding relation between the pre-calibrated digital signal and the radio frequency range. Optionally, the radio frequency switch link further includes a radio frequency single-pole multi-throw switch, a common end of the radio frequency single-pole multi-throw switch is connected with a second end of the radio frequency input end, an output end of the radio frequency single-pole multi-throw switch is connected with each radio frequency link respectively, and a control end of the radio frequency single-pole multi-throw switch is connected with one end of the controller; the radio frequency single-pole multi-throw switch is used for receiving a switching control instruction and switching to a target radio frequency link matched with the current radio frequency range according to the switching control instruction. Optionally, the radio frequency signal processing module comprises a weak coupling module, a power amplification module, an ALC module, an equalizer module, a radio frequency detection module, a signal processing module and an ADC module; One end of the weak coupling module is connected with the first end of the radio frequency input end, the other end of the weak coupling module is connected with one end of the power amplification module, the other end of the power amplification module is connected with one end of the ALC module, the other end of the ALC module is connected with one end of the equalizer module, the other end of the equalizer module is connected with one end of the radio frequency