摘要
针对采用多输出跨导运算放大器（ＯＴＡ）实现电流模式滤波器频率受限问题，提出了一种基于只有一个输出端的基本跨导运算放大器及电容的连续时间电流模式双二阶滤波器的最简实现方案；讨论了跨导运算放大器的非理想特性对电流模式滤波器的性能影响；面向实际电路完成了ＭＯＳ管级的计算机仿真，仿真结果表明所提出的滤波器电路在不加任何补偿措施的条件下，其特征频率可以达到５ＭＨｚ。
To deal with the frequency limitation of the multi output OTA based filters, a novel canonical realization of continuous time current mode CMOS OTA C biquad filter based the elementary operational transfer amplifier (OTA) with the only one output is proposed employing SFG (signal flow graph) and a various different kind of biquadratic filters is generated systematically. The effects on filter's performance of the non idealities of a CMOS OTA are studied and the computer simulations at the MOS transistor level are carried out and the results show that the characteristic frequency of the proposed circuits can be gotten to the 5MHz without any compensation.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
1998年第3期90-92,共3页
Journal of Tsinghua University(Science and Technology)
基金
中国博士后科学基金
