A Time-to-Digital Converter Based on Delay Locked Loop

Abstract

The invention relates to a time-to-digital converter based on a delay phase-locked loop. The converter comprises the delay phase-locked loop, an integer time detection array and a fractional time detection array, wherein the delay phase-locked loop is used to receive a reference clock signal, delay the reference clock signal to generate an equal-interval co-frequency clock cluster signal, and output the reference clock signal and the equal-interval co-frequency clock cluster signal; the integer time detection array is connected to the delay phase-locked loop and is used for receiving the reference clock signal, counting the reference clock signal, and outputting integer time data; and the fractional time detection array is connected to the delay phase-locked loop and is used for receivingthe equal-interval co-frequency clock cluster signal, a start signal and a stop signal, quantifying the start signal and the stop signal taking the equal-interval co-frequency clock cluster signal asa reference and outputting fractional time data. By using the time-to-digital converter, the accuracy and the stability of measurement are increased, the anti-interference capability of TDC is improved, the complex degree of a decoding circuit is simplified and the power consumption area of the TDC is reduced.

Description

technical field [0001] The invention belongs to the technical field of laser radar optical signal receiver systems, in particular to a time-to-digital converter based on a delay phase locked loop. Background technique [0002] In 1960, the world's first laser came out, and in 1961 the laser was first used in the ranging system. Due to a series of excellent optical properties of lasers such as high collimation, high monochromaticity, high power density and high coherence, various ranging technologies for different scenarios and different ranges are constantly being introduced. From as small as the micron-scale range close to the laser wavelength, centimeter-scale object shapes and target object distances from several kilometers to tens of kilometers, as large as the distance between the earth and satellites and even the moon, lasers can be used to accurately measure. And with the development of science and technology, the application scope of lidar is more and more extensive...

AI Technical Summary

Problems solved by technology

[0004] Current pulse wave lidar has been detected by the original single channel (see figure 1 ), developed into multi-line array scanning detection, and even large area array detection, which makes the time-to-digital conversion circuit also need to be area-array. High power consumption is far from satisfying the practical application of vehicle lidar

Images