A Fast and Stable AGC Amplifier

Abstract

The invention relates to a fast and stable AGC amplifier, belonging to the technical field of signal amplification, comprising a front-stage VGA amplifier circuit (1), a rear-stage VGA amplifier circuit (2), a continuous detection logarithmic amplifier circuit (3) and a voltage dividing circuit (4 ); the front-stage VGA amplifier circuit (1) is connected in series with the rear-stage VGA amplifier circuit (2); the signal input end of the continuous detection logarithmic amplifier circuit (3) is connected to the signal input end of the front-stage VGA amplifier circuit (1), divided The input end of the pressure circuit (4) is connected to the output end of the continuous detection logarithmic amplifier circuit (3), and the output end of the voltage divider circuit (4) is connected to the front stage VGA amplifier circuit (1) and the rear stage VGA amplifier circuit (2). Control terminal Vagc. The amplitude of the output signal of the invention can be kept stable quickly, and the stabilization time is less than 2 μs, which is less than one-thousandth of the stabilization time of the traditional AGC amplifier. Moreover, the entire circuit of the present invention has a simple structure and no discrete devices, so the consistency between the circuits is very good, basically no debugging is required, and it is convenient for mass production.

Description

technical field [0001] The invention belongs to the technical field of signal amplification and relates to a fast and stable AGC amplifier. Background technique [0002] The AGC amplifier is an important device in the receiving system. The function of the AGC amplifier is to amplify or attenuate the large dynamic signal received in the receiving system into an output signal with stable amplitude for subsequent circuits (such as AD conversion, etc.) to process. The role of the AGC amplifier is to prevent receiver overload caused by strong signals, compensate for the instability of receiver gain, ensure the normalization of angle error signals in tracking radars, and ensure the gain balance of multi-channel receivers in multi-beam three-coordinate radars . [0003] The traditional AGC amplifier uses a detection circuit to detect the output signal of the last stage VGA amplifier, and then passes through the filter circuit to generate a linear detection voltage to control the ...

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Problems solved by technology

[0004] In view of this, the purpose of the present invention is to provide a fast and stable AGC amplifier, which solves the problems of long stabilization time and difficult debugging of AGC amplifiers with traditional structures, and can well meet the consistency requirements of the receiving system of the whole machine, and is convenient for mass production

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