扫频型输电线路参数测量中自适应信号调理电路设计

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。

基于扫频原理的自适应滤波电路设计

设计了一种自适应滤波电路,该电路主要由中心频率可调带通滤波器组成。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功能,并在扫频型输电线路参数测量中得到了应用。

Realization of Fully Differential Fourth-Order Bessel Filter with Accurate Group Delay

A fully differential R-MOSFET-C fourth-order Bessel active lowpass filter employing fully differential operational amplifier,passive resistors,and current-steering MOS transistors as a variable resistor is proposed.This proposed implementation relies on the tunability of current-steering MOS transistors operating in the triode region counteracting the concert deviation of resistor in the integrated circuit manufacturing technology in orde r that the group delay of Bessel active filter could be designed accurately.The amplifier is not only with voltage common-mode negative feedback,but also with current common-mode negative feedback,which will benefit for the stability of its D C operating point.0.75μs group delay fourth-order Bessel lowpass filter,whic h is synthesized according to passive doubly terminated RLC prototype lowpass filter,demonstrates better than -65dB THD using 100kHz,2.5V pp signal in Taiwan UMC 2P2M(2-poly,2-metal)5.0V,0.5μm CMOS technology.