基于SAW技术的高精度频率测量仪设计与实现  

Design and Implementation of High Precision Frequency Measuring Instrument Base on SAW

作　　者：陈心宇 曾融生 洪业 杨雨诺 孙科学[1,2] CHEN Xinyu;ZENG Rongsheng;HONG Ye;YANG Yunuo;SUN Kexue(College of Electronic and Optical Engineering, Nanjing University of Posts and Telecommunications Nanjing 210023, China;Nation-Local Joint Project Engineering Lab of RF Integration & Micropackage, Nanjing 210023, China)

机构地区：[1]南京邮电大学电子与光学工程学院,江苏南京210023 [2]射频集成与微组装技术国家地方联合工程实验室,江苏南京210023

出　　处：《压电与声光》2020年第2期163-166,共4页Piezoelectrics & Acoustooptics

基　　金：国家自然科学基金资助项目(11304160);江苏省大学生创新创业训练计划基金资助项目(SZDG2018009);江苏省研究生实践创新计划基金资助项目(SJCX18_0286)。

摘　　要：设计了一种基于现场可编程门阵列(FPGA)等精度测频与自动增益控制(AGC)电路的高精度声表面波测量仪,该测量仪通过声表面波传感器采集声波并转化为电信号,通过AGC电路与施密特触发器对信号限幅、整形,将其转化为可测频率的方波,最后利用FPGA测频电路实现对频率的测量,并将结果传送至单片机显示。测试结果表明,该测量仪能测量频率100 Hz^100 kHz的信号,系统的最大测量误差为1.2%,测频范围广,精度高,稳定性好。A high-precision surface acoustic wave measuring instrument based on FPGA equal precision frequency measurement and automatic gain control(AGC)circuits is designed.The measuring instrument collects the sound wave through the surface acoustic wave sensor and converts it into an electric signal and limits and shapes the signal through the AGC circuit and the Schmitt trigger to convert it into a square wave of the measurable frequency.Finally,the frequency measurement circuit is realized by the FPGA frequency measuring circuit,and the result is transmitted to the single chip microcomputer for display.The test results show that the instrument can measure the signal frequency in the frequency range of 100 Hz^100 kHz.The maximum measurement error of the system is 1.2%,the frequency range is wide,the precision is high,and the stability is good.

关 键 词：等精度测频 声表面波传感器 现场可编程门阵列(FPGA) 自动增益控制(AGC) 

分 类 号：TM935[电气工程—电力电子与电力传动] TN710.9[电子电信—电路与系统]