XCP系统中微弱信号采集放大电路的设计与实现

Design and Implementation of Acquisition and Processing Circuit For Weak Signal in XCP System

根据XCP(投弃式海流剖面测量仪)测量电极和微弱信号的采集与处理技术的设计指标要求以及水下信号的特点,采用基于锁相放大技术的微弱信号采集与放大电路的设计方法,并且在信号幅度被放大的基础上,设计了压频转换电路,将幅度较小、频率较低的电压信号转换为调频信号,使测量到的电极信号便于进行传输。最后用PSpice电路仿真软件对部分电路进行了仿真分析,结果表明所设计的采集与放大电路对XCP是可行的,可以满足设计要求。

According to the requirements of design specifications of measuring electrode and processing weak signal of the XCP（expendable current profiler measurement technology）,and the characteristics of the underwater signal,the phase-locked amplifier circuit is used to collect and amplify the weak signal.And on the basis of the signal amplitude to be amplified,V/F conversion circuit is designed to convert the voltage signal into FM signal,so the signal which is low-voltage and low-frequency,can be transmitted easily.At last,PSpice circuit simulation software is used to analyze parts of the circuits.The results show that the acquisition and amplifier circuit designed for XCP are feasible,which meets the design requirements.