摘要
为了实现对混频信号的高速采样和同步处理,提出了一种采用正交数字解调算法的双通道数字锁相放大器.系统结构基于数字信号处理器(DSP)及其配合的硬件,并采用增强并口(EPP)协议,实现了DSP同PC机的双向高速通信.实验验证了该系统的可行性.
In order to sample mixing frequency signals in high speed and process them synchronously, a dual-channel digital lock-in amplifier （LIA） that uses orthogonal digital demodulation is proposed. The instrument, based on a digital signal processor （DSP） and its associated hardware, is implemented. The system adopts a method of high speed bi-directional parallel communication between DSP and parallel interface of PC by Enhanced Parallel Port （EPP） protocol. The experimental tests proved that the system is feasible.
出处
《电子器件》
CAS
2007年第4期1321-1324,共4页
Chinese Journal of Electron Devices
基金
国家自然科学基金重点资助项目(50337020
60532020)
国家自然科学基金资助项目(60301008
60472077)
关键词
数字锁相放大器
混频
正交数字解调
数字信号处理器
增强并口
双通道
digital lock-in amplifier
mixing orthogonal digital demodulation
digital signal processor
enhanced parallel
port dual-channel
