Low-complexity Multi-Function Adaptive Digital Frequency Meter Design
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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.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.
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