基于宽线性BOTA的新型通用滤波器设计  

Design of a new universal filter based on wide linear BOTA

作　　者：王明远[1] 周军晓[1] 王芳[1] 刘玉芳[1] 

机构地区：[1]河南师范大学物理与电子工程学院,河南新乡453007

出　　处：《电子元件与材料》2013年第10期59-61,共3页Electronic Components And Materials

基　　金：国家自然科学基金资助项目(No.60977063);河南省科技厅重大资助项目(No.122102210434)

摘　　要：提出了一种CMOS实现的平衡输出跨导运算放大器(BOTA)电路模型,该模型结构简单,仅由一个跨导运放和一个可变换的电流增益模块级联构成,通过偏置电流调节跨导增益,使线性电压输入范围提高三个数量级。采用BOTA与接地电容实现了三输入单输出的二阶通用滤波器设计。结果表明,该滤波器0可独立调节,且与Q正交,实现了0线性可调的高Q滤波。用Pspice仿真软件证实了滤波器的陷波特性和带通特性,实现了高、低Q值的灵活调节。A balanced output operational transconductance amplifier （BOTA） circuit model based on CMOS was described. The BOTA was simply constructed, which was designed by the cascade connection of a transconductance cell and an electronically tunable current gain cell. Through the transconductance gain of the proposed BOTA to be linearly tuned by bias current, the linear voltage input range increased for 3 orders of magnitude. The three-input and single-output biorders universal filter used by BOTA and grounded capacitors was designed. The results show that the circuit parameter ω0 can be adjusted independently and orthogonally set with Q, a linear adjustable ω0 and high Q filter is realized. The notch performance and band-pass characteristics of the filter are confirmed by Pspice simulating soft ware. The filter with flexible adjustment of high or low Q can be realized.

关 键 词：通用滤波器 BOTA 电流模式 宽线性范围 陷波特性 带通特性 

分 类 号：TM13[电气工程—电工理论与新技术]