The Design of Random Equivalent Sampling Module Based on FPGA

With the constant development of electronic technology, the capability of processing high frequency analog signals has become increasingly important. According to the contradiction between the demand of high speed AD convert chip and chip manufacture techniques and cost, this paper introduces the principle of random equivalent sampling. A module has been designed based on the interior resource in Field Programmable Gate Arrays. Its real time sampling is up to 50Msps and equivalent sampling is up to 1.6Gsps. This module which has common and compatible interface includes sampling trigger module, sampling clock generation module, little time measurement module and sampling data temporarily storage module. Each sub-module and the top module have been validated through the simulation. This solution is useful in various signal acquisition system.