高精度频率测定的ASIC实现

研究频率测量过程中输入信号的脉冲边沿与测量设备的闸门信号边沿不一致造成的频率测量误差.提出利用可编程ASIC器件来实现输入脉冲信号与MPU定时信号同步的实现方法,解决了输入脉冲和给定闸门时间起止时刻随机性引起的测量误差.基于ASIC的方法与其他频率测量方法相比,MPU外围电路简单,能自适应输入信号频率的变化.利用对输入信号进行测量前分频和利用2个寄存器扩大对频标的计数范围,扩大了对输入信号频率的测量范围.该工作为精确测量频率探索了一条新途经.

Fulfillment of high precise frequency measurement by ASIC

This paper analyzes usual measuring errors caused by inconsistency of the input signal pulse verge and strobe signal verge in frequency measurement. It sets forth an effective solution. This solution uses programmable ASIC widget to fulfill synchronism between the input signal pulse and MPU clocking signal. It also solves the measuring errors caused by the randomness of starting time and stopping time of the input pulse and strobe signal. Compared with other frequency measurements, the method based on the ASIC makes use of simple periphery circuit around MPU and can self-adapts the variation of input signal frequency. Dividing frequency before measurement and using two registers to extend counting range of (frequency) enlarge the measurement range of inputting frequency. The work of the paper has searched after a new way for high precise frequency measurement.