Time to digital converter

This device is a four-channel 10ps high-precision time measurement chip. It is mainly used to measure the time difference between 4 STOP signals and 1 START signal. The chip mainly includes three parts: delay-locked loop, quantizer and data processing. The delay phase-locked loop adopts a two-stage cascaded structure of coarse and fine delay phase-locked loops. The coarse delay phase-locked loop outputs a multi-phase clock for the coarse quantizer as a reference, and the fine delay phase-locked loop is used to generate accurate delay time. The control voltage corresponding to the time is used as a reference for the fine quantizer, the quantizer quantifies and counts the delay time, and the data processing performs the final quantized data processing to obtain the time difference between each STOP channel and the START channel.