Digitally-controlled peak value holding and automatic discharge circuit with ping-pong structure

Abstract

The invention relates to the field of peak value sampling measurement, and provides a digitally-controlled peak value holding and automatic discharge circuit with a ping-pong structure. The circuit can achieve peak value holding and automatic discharge of multiple dense echo signals, and requirements of the conversion speed of a post-stage AD conversion circuit are reduced. Therefore, according tothe technical scheme adopted by the circuit, the digitally-controlled peak value holding and automatic discharge circuit with the ping-pong structure is composed of a rising edge detection module, ashift control module, a controller, an AD conversion module, and an N-path peak value holding and automatic discharge circuit, wherein the path peak value holding and automatic discharge circuit includes a an inverter, a transconductance type peak value holding module, a channel switch, a discharge switch, and two driving modules The circuit is mainly applied to occasions of peak value sampling measurement.

Description

technical field [0001] The invention relates to the field of peak sampling measurement, in particular to the field of laser ranging echo peak sampling measurement. Specifically, it involves a digitally controlled ping-pong structure peak hold and automatic discharge circuit. Background technique [0002] Since its appearance, lidar has been widely used in three-dimensional shape measurement, UAV obstacle avoidance and unmanned vehicles, among which the most prominent is the application of unmanned vehicles in the civilian field. With the continuous development and maturity of unmanned driving technology, its indicators such as lidar ranging range, angular resolution, and ranging accuracy are also continuously improved. In addition, the requirements of unmanned driving technology for lidar are no longer limited. In terms of distance measurement, the recognition technology of the measured object has attracted more and more attention. [0003] However, in the process of laser...

AI Technical Summary

Problems solved by technology

In order to collect the intensity information of multiple echoes with extremely short time intervals, extremely high requirements are placed on the AD conversion speed and the processing speed of the single-chip microcomputer. The hold of two adjacent pulse peaks of the wave

At present, some scholars have proposed a "digital + analog" structure peak hold circuit to solve this problem. It uses multiple D flip-flop chips to realize the switching of the hold channel, but its circuit structure is complex, and the number of D flip-flop chips required is large. and not easy to cascade

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