低复杂度多功能自适应数字频率计设计

基金项目:

国家自然科学基金项目(61571386)

河南省高等学校重点科研项目(15A510011)

信阳师范学院青年骨干教师资助计划

详细信息

Low-complexity Multi-Function Adaptive Digital Frequency Meter Design

1.
College of Physics & Electronics, Xinyang Normal University, Xinyang 464000,China
2.
Communication Software & ASIC Design Centre, Tongji University, Shanghai 200092, China

摘要: 利用高速运放和比较器实现输入弱小信号的放大及整形，采用ＦＰＧＡ完成对输入信号的精确频率测量．测量范围为１Ｈｚ～１００ＭＨｚ，内部分成５个量程，可根据输入信号频率不同自动进行量程切换，并支持对方波的占空比及双通道同源方波时间间隔测量等功能．ＦＰＧＡ测量结果经ＭＣＳ－５１单片机处理后送至ＬＣＤ完成显示，测量相对误差不大于１０－４，可用于各类低成本数字测量仪器研发．
- 数字频率计 /
- 信号放大及整形 /
- 现场可编程门阵列
Abstract: High-speed amplifier and comparator were adopted to complete waveform amplifying and reshaping. With FPGA as processing core, accurate frequency measurement of input signal can be obtained. 5 measurement scales were divided to support 1 Hz~100 MHz frequency measurement internally. Automatic scale switch was implemented, too. Furthermore, duty measurement of square wave, and time interval analysis of 2 homologous square wave all supported. MCS-51 microcontroller was utilized to complete final result calculation using FPGA’s original measurement data, and these results were displayed via LCD. Corresponding relative measurement error was less than 10^－4. Presented design can be used for low-cost digital frequency meter design.
- digital frequency meter /
- signal amplifying & reshaping /
- field programmable gate array

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