摘要
针对强干扰场合的信号采样问题,利用DSP芯片的高性能时钟及捕获功能,实现一种新的模数转换器。将被测模拟信号变换为频率与输入量大小成正比的脉冲信号,经过光电隔离电路改善信号传输特性后,送至DSP处理器实现高精度的频率测量,最终由软件完成频率到模拟信号数值大小的换算,从而实现了模数转换与采样。实验结果表明,该模数转换器A/D转换精度可达12bit,模拟输入信号与模数采集系统能有效隔离、并具有硬件电路简单、抗干扰能力强的特点。
Aiming at signal sampling under strong interference environment,Ananalogdigital conversion circuit usinghigh precision clock and capture function of DSP is presented.The measured analog signal is converted into pulse signal whose frequency is proportional to the input signal. After the photoelectric isolation circuit to improve the signal transmission characteristics, the pulse signal is sent to DSP processor to achieve high precision frequency measurement.Eventually the analog signal value can be calculated by the software. The experimental results proveits precision can be up to 12 bit A/D transformation precision and the system has some merits of signal sampling, such as convenience for signal isolation, simple transforming circuit and strong anti-interference ability.
出处
《电子设计工程》
2017年第6期79-83,共5页
Electronic Design Engineering
基金
国家自然科学基金(51465047)
航空科学基金(2014ZD56009)
关键词
DSP
模数转换
强干扰
捕获
信号隔离
转换精度
DSP
analogdigital conversion
strong interference
capture
signal isolation
precision oftransformation
