DDS信号源中的测频电路设计

介绍了一种基于直接数字频率合成(DDS)器、CPLD和单片机技术的高分辨率、高稳定度的DDS信号源,并详细设计了DDS信号源中基于CPLD、单片机的频率测量电路。此测频电路克服传统以单片机为核心的测频系统测频速度慢,不能满足高速、高精度的问题,能真正实现高速、宽范围测频,是DDS信号源中的重要组成部分。

Frequency Measurement Circuit Design of DDS SignaI Source

This paper introduces a signal source with high resolution and high stability designed by direct digital frequency synthesis（DDS）device,CPLD and microcontroller technology,and mainly introduces the frequency measurement circuit based by CPLD and microcontroller.This frequency measurement circuit overcome the traditional frequency measurement system based on microcontroller whose frequency measurement speed is slow,cannot satisfy the high speed,high precision,high speed.It can realize a wide range of frequency measurement,is an important component of the DDS signal source.