Design of Variable and Equal Precision Frequency Measurement Based on CPLD

This paper has proposed an improved frequency conversion equal precision frequency cycle measuring method based on the basic principles of counter cycle measuring method, and it can be used to measure the frequency conversion signal, whose pulse width is much different from repetition period or whose repetition period is random jittering. A high precision real time frequency measurement experiment is completed on CPLD based on the proposed theory and simulation and actual testing have been carried out. The result shows that the proposed system has some advantages of high measurement precision and great real-time performance, and can be widely applied in the field of high precision real time pulse width measurement with low cost.