一种优化周期测频法数字频率计的设计Design of a digital frequency meter based on optimized cyclical frequency measurement method
苟铭泽,崔少辉,魏保华
摘要(Abstract)：
针对在频率测试中使用周期测频法测高频信号存在较大误差的问题,设计了一种以现场可编程逻辑门阵列为核心控制器件的数字频率计。该频率计在采用周期测频法的基础上,同时设计了被测信号的量程估计模块和分频模块提高测试精度。该频率计不需人为设置量程,量程估计模块可以自动确定被测信号fx的频率范围。被测信号经过量程估计后,根据量程值确定分频数N,对fx进行10N分频,将分频后的信号作为闸门来进行精确的测量。由于被测信号经过分频,所得的闸门得到了相应的扩大,从而减小了测试误差。仿真结果表明,该频率计能够实现对输入频率范围在1 Hz～10 MHz的周期信号周期测量,测量精度在10-6。
关键词(KeyWords)： 周期测频;频率计;现场可编程逻辑门阵列;量程估计;分频;闸门
基金项目(Foundation): CEMEE国家重点实验室开放基金(2017Z0301B1)~~
作者(Author): 苟铭泽,崔少辉,魏保华
DOI: 10.16652/j.issn.1004-373x.2018.23.038
参考文献(References)：
- [1]张天恒,叶伟,王阳阳,等.基于SOPC的便携式高精度频率仪设计[J].仪表技术与传感器,2015(5):34-37.ZHANG Tianheng,YE Wei,WANG Yangyang,et al.Portable high-precision frequency meter design based on SOPC[J]Instrument technique and sensor,2015(5):34-37.
- [2]高锐.基于FPGA的多周期同步频率计设计[D].长春:吉林大学,2013.GAO Rui.Design of synchronous multi-cycle frequency meter based on FPGA[D].Changchun:Jilin University,2013.
- [3]杜蒙蒙.高精度时间差、频率差测量技术研究[D].西安:西安电子科技大学,2010.DU Mengmeng.High accuracy time interval and frequency difference measurement technique research[D].Xi’an:Xidian University,2010.
- [4]黎山峰,杨雷,孙建军.基于NiosⅡ的FPGA频率计设计与实现[J].仪表技术与传感器,2016(8):105-108.LI Shanfeng,YANG Lei,SUN Jianjun.Design and implementation of FPGA meter based on NiosⅡ[J].Instrument technique and sensor,2016(8):105-108.
- [5]饶成明,马希直.基于FPGA的多功能全同步数字频率计设计[J].现代电子技术,2010,33(2):151-153.RAO Chengming,MA Xizhi.Design of multi-functional fullsynchronization digital frequency meter based on FPGA[J]Modern electronics technique,2010,33(2):151-153.
- [6]张建新.基于通用集成电路的数字频率计设计与实现[D].天津:天津大学,2008.ZHANG Jianxin.Design and implement of digital cymometer based on general integrated circuit[D].Tianjin:Tianjin University,2008.
- [7]张松,李筠.FPGA的模块化设计方法[J].电子测量与仪器学报,2014(5):560-565.ZHANG Song,LI Yun.Modular design of FPGA design methodology[J].Journal of electronic measurement and instrumentation,2014(5):560-565.
- [8]高鹏.可控量程智能数字传感器设计[D].太原:中北大学,2010.GAO Peng.Controllable range of intelligent digital sensor[D].Taiyuan:North University of China,2010.
- [9]胡文静,张国云,刘翔.量程自整定高精度频率测量的FPGA实现[J].电子技术应用,2012(6):52-55.HU Wenjing,ZHANG Guoyun,LIU Xiang.FPGA implementation of auto span-switching high precision digital cymometer[J].Application of electronic technique,2012(6):52-55.
- [10]鲍可进.数字逻辑电路设计[M].北京:清华大学出版社,2003.BAO Kejin.Digital logic circuit[M].Beijing:Tsinghua University Press,2003.