Peak holding and auto-discharge circuit for ping-pong structure based on analog control

Abstract

The invention relates to the field of peak sampling and measurement. In order to realize peak holding and auto-discharge of multiple dense echo signals, and reduce the requirements on the conversion speed of a post-stage AD conversion circuit and the processing speed of a single-chip microcomputer, a peak holding and auto-discharge circuit for a ping-pong structure based on analog control is composed of a rising edge detection module, a transimpedance amplification module, a secondary amplification module, an AD conversion circuit and N peak holding and auto-discharge circuits. Each peak holding and auto-discharge circuit comprises a falling edge detection module, a monostable trigger module, a transconductance peak holding module, a channel switch, a discharge switch and a falling edge detection module. A first peak holding and auto-discharge circuit does not comprise the falling edge detection module, and the signal is converted into a voltage pulse signal firstly through the transimpedance amplification module and the secondary amplification module after a laser echo is detected. The peak holding and auto-discharge circuit for the ping-pong structure based on the analog controlis mainly applied to the occasions of peak 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 ping-pong structure peak hold and automatic discharge circuit based on analog control. 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 la...

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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