期刊论文

Implementation of AC millivoltmeter based on equivalent sampling

中文

传感器与微系统

2096-2436

2018

37

10

92-94

10.13873/J.1000—9787(2018)10—0092—03

本校为第一机构

通过对等效随机采样和等效顺序采样2种等效采样方式的分析对比,提出了一种10 MHz交流毫伏表的设计方法。前端调理电路将待测信号衰减或放大到合适的幅度,现场可编程门阵列（FPGA）驱动模/数转换器（ADC）芯片实现等效采样,单片机（MCU）对采样所得数据进行分析处理,得到最终测量值。经过测试,采用1 MHz采样率的ADC芯片,最终可以还原10 MHz以下的待测信号,并能够精准测得其有效值。

Through analysis and comparison of equivalent random sampling and equivalent sequential sampling,present a design proposal for 10 MHz AC millivoltmeter. The fount-end adjusting circuit modulates the signal to an appropriate amplitude,then field programmable gate array（ FPGA） drives the ADC chip to achieve equivalent sampling,the final measured value is calculated after microprogrammed control unit（ MCU） processing the sampled data. Test results shows that the signal under 10 MHz can be restored and the effective value of the signal can be mea...