开关电容低通滤波器的设计  

Design of switched-capacitor low-pass filter

作　　者：常杰[1] 刘诗斌[1] 

机构地区：[1]西北工业大学,陕西西安710129

出　　处：《电子设计工程》2012年第8期171-173,共3页Electronic Design Engineering

摘　　要：为了滤除信号中掺杂的高频噪声,设计一种六阶级联式开关电容低通滤波器,以数据采样技术代替传统有源RC滤波器中的大电阻,有利于电路的大规模集成。滤波器由双二阶子电路级联而成,电路中的电容值利用动态定标技术计算确定。用Hspice进行仿真验证,结果表明:开关电容低通滤波器能较好地对信号进行整形,其频率特性符合设计指标。In order to eliminate high-frequency noise doped in the signal,a sixth-order cascade switched-capacitor low-pass filter is designed in this paper.The data sampling technique is used in the filter to replace large resistances in the tranditional active RC filter,which is beneficial for large-scale integrated circuits.The filter is cascaded by biquad sub-circuits,the capacitance values in the circuit are calculated with dynamic range scaling technology.The simulation and valid results based on the Hspice show that the switched-capacitor low-pass filter can shape the signal effectively and the frequency characteristics meets design specifications.

关 键 词：低通滤波器 开关电容 HSPICE 双二阶 动态定标 

分 类 号：TN431.1[电子电信—微电子学与固体电子学]