A method and circuit for controlling power amplifier without overshoot

A power amplifier and power control technology, applied in the direction of gain control, amplification control, electrical components, etc., can solve the problem of output power overshoot, etc., and achieve the effect of preventing overshoot

Active Publication Date: 2018-11-27
36TH RES INST OF CETC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the output power of the power amplifier will overshoot at the initial stage of starting the power amplifier using the traditional analog automatic level control circuit, the present invention provides a method and circuit for controlling the power amplifier without overshoot

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  • A method and circuit for controlling power amplifier without overshoot
  • A method and circuit for controlling power amplifier without overshoot

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Embodiment Construction

[0039] The design concept of the present invention is: when the power amplifier is powered on, a larger attenuation value is set for the electric attenuator, so that the signal is attenuated to an appropriate level when the closed-loop control response has not started initially, avoiding the traditional analog control circuit The overshoot problem caused by the delay in starting control; then correct the attenuation voltage according to the detection level output by the directional coupler, so that the detection level is always controlled on the preset reference, and the circuit is always in a dynamic balanced working state, so as to realize Automatic gain control to prevent output power from overshooting.

[0040] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0041] figure 1 It is a fl...

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Abstract

The invention discloses a method and circuit for avoiding the overshoot of a power amplifier. The method comprises the steps of: adding an initial attenuation voltage to an electrically controlled attenuator when the power amplifier is powered up, and setting a relatively large attenuation value; keeping the magnitude of the attenuation voltage unchanged when a demodulation level output by a directional coupler changed between zero and a first reference level; controlling the attenuation voltage to increase with the increase of the demodulation level when the demodulation level changes between the first reference level and a second reference level; controlling the attenuation voltage to decrease with the increase of the demodulation level when the demodulation level changes between the second reference level and a third reference level; and keeping the magnitude of the attenuation voltage to be identical with the initial attenuation voltage when the demodulation level is larger than the third reference level. According to the invention, when the power amplifier is powered up, the relatively large attenuation value is set to the electrically controlled attenuator to enable signal attenuation to reach a suitable level, so that the overshoot of the output power is avoided.

Description

technical field [0001] The invention relates to the field of power control, in particular to a method and circuit for controlling a power amplifier without overshoot. Background technique [0002] The continuous development of communication countermeasure technology has put forward new requirements for the power control of power amplifiers. For example, the new generation of high-speed frequency hopping communication / jamming systems requires faster and more stable control of power transmission, which requires power amplifiers to meet the response speed Fast, small power output overshoot, and flexible and reliable power output. The interference excitation signals in modern communication countermeasure systems widely present the characteristics of multi-carrier and peak-to-average ratio, which brings new challenges to the overshoot performance design of power amplifiers. [0003] In the existing automatic level control circuit system of the power amplifier, the broadband stab...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03G3/30
CPCH03G3/3036
Inventor 卫明邹炜
Owner 36TH RES INST OF CETC
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