一种新颖的高阶CMOS OTA—C高通滤波器的设计方法

提出了一种新颖的高阶ＯＴＡ－Ｃ高通滤波器的设计方法：使用ＯＴＡ－Ｃ积分器及ＯＴＡ加法器对高阶高通滤波器传递函数的结构框图进行综合。其中ＯＴＡ加法器中的电阻由ＤＯ－ＯＴＡ实现，整个电路仅由ＯＴＡ及接地电容构成，而ＯＴＡ由ＣＭＯＳ器件构成，所以文中电路便于集成且与ＶＬＳＩ工艺兼容。对三阶巴特沃思高通滤波器进行了设计举例，并给出了其计算机ＰＳＰＩＣＥ仿真结果及非理想特性分析。

A Novel Design Method for High-order CMOS OTA-C Highpass Filter

The paper presents a novel design method for high-order highpass filters: by using OTA-C integrators and OTA adders, the structure frame figure of high-order highpass filter transfer function is synthesized. The resistor in OTA adder is realized by DO-OTA(OTA with dual outputs).The circuit is just composed by OTAs and grounded capacitors. Moreover, the OTA is constructed by CMOS components. So the circuit is integrated conveniently and is compatible with VLSI technology. The design example of third-order butterworth highpass filter is given, and its computer PSPICE imitating and non-ideal character analysis are all made.