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锁相(lock-in)放大器对信号幅度与相位的测量是一种有用的工具。数据采集卡可以对放大器的输出信号作数字化,软件可以计算幅度与相位。DSP或通用处理器也可以用来计算幅度与相位。本文中的电路在一个低价的锁相放大器中集成了两只Analog Devices公司的AD9954 DDS(直接数字综合器)和AD630平衡调制器/解调
Lock-in amplifiers measure signal amplitude and phase as a useful tool. The data acquisition card digitizes the amplifier output signal and the software calculates amplitude and phase. The DSP or general purpose processor can also be used to calculate amplitude and phase. The circuit in this article integrates two Analog Devices AD9954 DDS (Direct Digital Synthesis) and AD630 balanced modulator / demodulator in a low cost lock-in amplifier