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CN-122026838-A - Radio frequency power amplifier circuit with input protection function and radio frequency front-end module

CN122026838ACN 122026838 ACN122026838 ACN 122026838ACN-122026838-A

Abstract

The application relates to the technical field of radio frequency front-end modules, and provides a radio frequency power amplifier circuit with an input protection function and a radio frequency front-end module, wherein the circuit comprises a power amplification module; the device comprises a power amplifying module, a power detection module, a power limiting module and a limiting control module, wherein the power limiting module is connected with the input end of the power amplifying module and used for limiting the power of a radio frequency input signal input to the power amplifying module, and the limiting control module is respectively connected with the power detection module and the controlled end of the power limiting module and used for controlling the limiting amplitude of the power limiting module to the radio frequency input signal power. The power detection module is used for detecting the input power in real time, the amplitude limiting control module is used for controlling the amplitude limiting of the power amplitude limiting module on the input signal power according to the detected power, the radio frequency power input to the power amplifying module is ensured to be limited below a safety threshold, the input protection function is realized, the situation that the device is damaged due to the fact that the radio frequency power is too large is avoided, and therefore reliability and stability are improved.

Inventors

  • YU YING
  • GAO ANMING
  • ZHENG LEI
  • JIANG WEI

Assignees

  • 浙江星曜半导体有限公司

Dates

Publication Date
20260512
Application Date
20251229

Claims (10)

  1. 1. A radio frequency power amplifier circuit with an input protection function, comprising: the power amplification module (100) is used for acquiring a radio frequency input signal for amplification; a power detection module (200) for detecting the power of the radio frequency input signal; The power limiting module (300) is connected with the input end of the power amplifying module (100), and the power limiting module (300) is used for limiting the power of the radio frequency input signal input to the power amplifying module (100); And the amplitude limiting control module (400) is respectively connected with the power detection module (200) and the controlled end of the power amplitude limiting module (300), and the amplitude limiting control module (400) is used for controlling the amplitude limiting of the power amplitude limiting module (300) on the radio frequency input signal.
  2. 2. The radio frequency power amplifier circuit with an input protection function according to claim 1, wherein the clipping control module (400) comprises a comparison unit (410), a threshold generation unit (420) and a clipping signal generation unit (430), a first input terminal of the comparison unit (410) is connected to the power detection module (200), a second input terminal of the comparison unit (410) is connected to the threshold generation unit (420), and the clipping signal generation unit (430) is connected to an output terminal of the comparison unit (410) and a controlled terminal of the power clipping module (300), respectively.
  3. 3. The radio frequency power amplifier circuit with the input protection function according to claim 2, further comprising a mismatch detection module (500), wherein the mismatch detection module (500) is respectively connected to an output end of the power amplification module (100) and the clipping control module (400), the mismatch detection module (500) is configured to detect an antenna mismatch degree, and the clipping control module (400) is configured to control a limiting amplitude of the power of the radio frequency input signal by the power clipping module (300) according to the antenna mismatch degree.
  4. 4. A radio frequency power amplifier circuit with an input protection function according to claim 3, wherein the mismatch detection module (500) comprises a forward and reverse power detection unit (510) and a dc conversion unit (520), the forward and reverse power detection unit (510) is connected to the output end of the power amplification module (100), the dc conversion unit (520) is connected to the forward and reverse power detection unit (510) and the threshold value generation unit (420), respectively, and the forward and reverse power detection unit (510) is used for detecting forward power and reverse power at the output end of the power amplification module (100).
  5. 5. The radio frequency power amplifier circuit with an input protection function according to claim 4, wherein the forward and reverse power detection unit (510) comprises a forward and reverse power coupler (511), the direct current conversion unit (520) comprises a first direct current bias unit (521), a first detection unit (522), a second detection unit (523), a first filtering unit (524) and a second filtering unit (525), the first direct current bias unit (521) is connected with the first detection unit (522) and the second detection unit (523), the main line of the forward and reverse power coupler (511) is connected with the output end of the power amplification module (100), the forward and reverse coupling end of the forward and reverse power coupler (511) is connected with the input end of the first detection unit (522), the reverse coupling end of the reverse power coupler (511) is connected with the input end of the second detection unit (523), the output end of the first detection unit (522) is connected with the second threshold value generating unit (420) through the first filtering unit (524), and the output end of the first detection unit (522) is connected with the second threshold value generating unit (420).
  6. 6. A radio frequency power amplifier circuit with input protection function according to any of claims 1 to 5, characterized in that the power clipping module (300) comprises a selection enabling unit (310) and at least two clipping units (320), the input of each clipping unit (320) is used for obtaining a radio frequency input signal, the output of each clipping unit (320) is connected to the input of the power amplifying module (100), the selection enabling unit (310) is connected to the controlled end of each clipping unit (320), the selection enabling unit (310) is used for selecting one of the clipping units (320) to enable under the control of the clipping control module (400), and the limiting amplitude of the radio frequency input signal power by different clipping units (320) is different.
  7. 7. The radio frequency power amplifier circuit with input protection according to claim 6, wherein the power clipping module (300) further comprises a second dc bias unit (330), and the second dc bias unit (330) is connected to the clipping unit (320).
  8. 8. A radio frequency power amplifier circuit with input protection according to any of claims 1 to 5, characterized in that the power detection module (200) comprises a directional power coupler (210), a main line of the directional power coupler (210) is connected to an input terminal of the power clipping module (300), and a directional coupling terminal of the directional power coupler (210) is connected to the clipping control module (400).
  9. 9. The radio frequency power amplifier circuit with the input protection function according to claim 8, wherein the power detection module (200) further comprises a third direct current bias unit (220), a third detection unit (230) and a third filtering unit (240), the third direct current bias unit (220) is connected with the third detection unit (230), a directional coupling end of the directional power coupler (210) is connected with an input end of the third detection unit (230), and an output end of the third detection unit (230) is connected with the limiting control module (400) through the third filtering unit (240).
  10. 10. A radio frequency front end module comprising a radio frequency power amplifier circuit with input protection according to any of claims 1 to 9.

Description

Radio frequency power amplifier circuit with input protection function and radio frequency front-end module Technical Field The present application relates to the field of radio frequency front end modules, and in particular, to a radio frequency power amplifier circuit with an input protection function and a radio frequency front end module. Background In a wireless communication system, a radio frequency front-end module plays a key role in receiving and transmitting radio frequency signals. The radio frequency front end module is generally integrated with key components such as a radio frequency power amplifier, a low noise amplifier, a filter, a switch and the like so as to realize the functions of receiving, transmitting, amplifying, filtering and the like signals, and is a bridge for connecting the baseband processing unit and the antenna. The performance of the rf front-end module directly affects the stability and reliability of the communication device. However, in the rf front-end module in the prior art, when the antenna is subjected to extreme mismatch, such as disconnection, short circuit or improper connection, if the input rf power is too large and exceeds the safe working range, the components in the rf front-end module may be damaged, resulting in performance degradation, and even the whole rf front-end module may fail and cannot be used. Therefore, how to ensure that the rf front-end module cannot be damaged or failed due to excessive input power is a problem to be solved in the working process of the rf front-end module. Disclosure of Invention The application provides a radio frequency power amplifier circuit with an input protection function and a radio frequency front-end module, which are used for solving the defect that the radio frequency front-end module in the prior art has damage or failure caused by overlarge radio frequency power. The application provides a radio frequency power amplifier circuit with an input protection function, which comprises: The power amplification module is used for acquiring a radio frequency input signal for amplification; The power detection module is used for detecting the power of the radio frequency input signal; The power limiting module is connected with the input end of the power amplifying module and is used for limiting the power of the radio frequency input signal input to the power amplifying module; And the amplitude limiting control module is respectively connected with the power detection module and the controlled end of the power amplitude limiting module and is used for controlling the amplitude limiting of the power of the radio frequency input signal by the power amplitude limiting module. According to the radio frequency power amplification circuit with the input protection function, the amplitude limiting control module comprises a comparison unit, a threshold value generation unit and an amplitude limiting signal generation unit, wherein a first input end of the comparison unit is connected with the power detection module, a second input end of the comparison unit is connected with the threshold value generation unit, and the amplitude limiting signal generation unit is respectively connected with an output end of the comparison unit and a controlled end of the power amplitude limiting module. The radio frequency power amplification circuit with the input protection function further comprises a mismatch detection module, wherein the mismatch detection module is respectively connected with the output end of the power amplification module and the amplitude limiting control module, the mismatch detection module is used for detecting the mismatch degree of an antenna, and the amplitude limiting control module is used for controlling the limiting amplitude of the power limiting module on the radio frequency input signal power according to the mismatch degree of the antenna. According to the radio frequency power amplification circuit with the input protection function, the mismatch detection module comprises a forward and reverse power detection unit and a direct current conversion unit, wherein the forward and reverse power detection unit is connected with the output end of the power amplification module, the direct current conversion unit is respectively connected with the forward and reverse power detection unit and the threshold generation unit, and the forward and reverse power detection unit is used for detecting forward power and reverse power of the output end of the power amplification module. According to the radio frequency power amplification circuit with the input protection function, the forward and reverse power detection unit comprises a forward and reverse power coupler, the direct current conversion unit comprises a first direct current bias unit, a first detection unit, a second detection unit, a first filtering unit and a second filtering unit, the first direct current bias unit is respectively connected with the fir