扫频型输电线路参数测量中自适应信号调理电路设计

The Design of Adaptive Signal Conditioning Circuit in the Transmission Lines Parameters Measurement by Sweeping

设计了一种自适应信号调理电路，该电路主要由中心频率可调带通滤波器和自适应信号放大器组成。论文详细给出了基于数字信号控制器（DSC）、开关电容滤波器和程控增益放大器的实现方案。实验结果表明，该电路在200～800Hz的频带内具有良好的动态带通滤波和自适应信号放大功能，并在扫频型输电线路参数测量中得到了应用。

In this paper, a kind of adaptive signal conditioning circuit is designed. The electric circuit consists of band-pass filter with center frequency adjustment and adaptive signal amplification. In more details, the employed components include a digital signal controller （DSC）,a switched capacitor filter and a programmable gain amplifier. The experimental results show that the circuit has a good performance in dynamic band-pass filter and adaptive signal amplification in the band of 200-800Hz, and it has been applied in the transmission lines parameters measurement by sweeping.