高频OTA-C梯形结构低通滤波器的设计

High Frequency OTA-C Ladder Structure Low-Pass Filter Design

给出一种基于线性变换技术及网络传输方程设计的高频运算传输电导放大器—电容(OTA_C)的梯形结构低通滤波器的方法 ,归纳了四个基本节的OTA_C的实现及链接条件 ,该方法可用于设计最平幅度及契比雪夫低通滤波器 ,其特点有 :n阶低通滤波器仅需要n+ 2个OTA元件和n个电容 ;所有OTA元件具有相同的传输电导 ;所有电容都一端接地 .最后给出的一个 5阶契比雪夫低通滤波器的设计实例及PSPICE模拟结果 ,证实了该方法的正确性 .

Based on linear transformation technology and network transfer function, this paper presents a way to design a high frequency operational transconductance amplifier_C(OTA_C) ladder low_pass filter with the butterworth and Chebyshev characteristic and gives out four basic OTA_C sections as well as link condition. The designed filter has the property including: (n order low_pass filter only needs n+2 OTA elements and n capacitors; all of the OTA elements have the same transconductance; all of the capacitors are grounded. Finally a design example and PSPICE simulation for a fifth order Chebyshev low_pass filter verify the suggested method.