A Multichannel High-Precision Pulse Counting System Based on FPGA

摘要

This chapter presents a multichannel and high-precision pulse counting system based on the time interval measurement on the Xilinx ZYNQ-7000 series device. The theoretical resolution of time interval measurement can reach 10-ps using the internal fast carry chain on the field-programmable gate array (FPGA) and the wave union method. As a result, as limited by the hardware condition and the carry chain's structure, the practical resolution of 40-ps is realized, which means that 2048 times subdivision for pulse signal running at 12M is available. It fully meets the requirement of pulse counting in the measurement system of the precise laser interferometer position.