摘要
为更好地提取被噪声淹没的微弱信号,在分析了锁相放大器原理的基础上,采用CD4046和AD630设计了一个双相位锁相放大器,并进行了实验验证,实验验证结果表明,该放大器可以测量1 mA以下的交流电流,灵敏度为20 mV/mA,精度0.05%,是一种高精度、实用型锁相放大电路。
In order to better Abstract the weak signal submerged by noise,this paper analyzes the theory of the phase lock-in amplifier and designs a dual phase lock-in amplifier using CD4046 and AD630.Experimental results show that the amplifier can measure alternating-current less than 1 mA and it is a high-precision and practical phase lock-in amplifier with a sensitivity of 20 mV/mA and a precision of 0.05%.
出处
《电子科技》
2012年第3期75-77,81,共4页
Electronic Science and Technology
