Multi-channel signal amplifying circuit of low-duty ratio narrow pulse signal and control method

Abstract

The invention discloses a multi-channel signal amplifying circuit of a low-duty ratio narrow pulse signal and a control method. The multi-channel signal amplifying circuit of the low-duty ratio narrow pulse signal comprises a variable gain amplifying circuit, an adder circuit, a sampling keeping circuit and a master control unit module, wherein the master control unit module comprises a micro-control module; and an analogue-digital conversion module, a trigger circuit and a digital-analogue conversion module are integrated inside the micro-control module. According to the control method of the multi-channel signal amplifying circuit based on the low-duty ratio narrow pulse signal, the adder circuit can merge a plurality of paths of output signal amplitudes of the variable gain amplifying circuit into a path of signal; the micro-control module in the master control unit module judges the signal amplitude output by the adder circuit, and adjusts the voltage change output by the digital-analogue conversion module, so that the gain of a voltage-programmed variable gain amplifier is correspondingly changed, and the adder circuit outputs the pulse signal amplitude to stabilize at a set numerical value, so that a dynamic range output by the variable gain amplifier is reduced.

Description

technical field [0001] The invention relates to a hybrid integrated circuit in a laser detector and a control method, in particular to a multi-channel signal amplifying circuit and a control method of a low duty cycle narrow pulse signal. Background technique [0002] For some multi-channel signal processing systems using narrow pulse signals with low duty cycle, such as multi-channel laser detectors, since the dynamic range of the output signal reaches 40dB, the pulse width is hundreds of nanoseconds to several microseconds, and the period is as long as several milliseconds To tens of milliseconds, the signal must be amplified to an appropriate level by a variable gain amplifier before it can be processed by subsequent modules. However, since the dynamic range of the received signal amplitude is up to 40dB, if the gain segmentation control method is adopted, if the number of gain segmentation stages is small, the goal will not be achieved. Not conducive to system assembly....

AI Technical Summary

Problems solved by technology

However, since the dynamic range of the received signal amplitude is up to 40dB, if the gain segmentation control method is adopted, if the number of gain segmentation stages is small, the goal will not be achieved. Not conducive to system assembly

[0003]The existing AGC amplifier, because its closed-loop control system uses multi-period integration to obtain the output signal amplitude, cannot accurately and timely obtain the multi-channel low duty ratio narrow pulse signal Therefore, it is not suitable for multi-channel low duty cycle narrow pulse signal amplification

[0004] In addition, because it is a multi-channel signal amplification circuit, the output signal amplitude of each channel is inconsistent, and the gain requirements are consistent. If the output amplitude of one of the channels is used as a reference to control the other The gain of the channel will cause the output signal amplitude saturation of other channels. Therefore, measures must be taken to obtain the multi-channel integrated output signal amplitude as a reference signal in order to generate a gain control signal and control the transmission gain of the multi-channel amplifier.

Images