一种改善CMOS OTA线性度的实现电路  

Circuit′s Realization of Improving Linearity of CMOS OTA

作　　者：李力[1] 涂用军[1] 

机构地区：[1]广东科学技术职业学院,广东广州510640

出　　处：《现代电子技术》2009年第14期149-151,共3页Modern Electronics Technique

摘　　要：为了满足低电压、低功耗跨导放大器-电容(OTA-C)连续时间型高频模拟集成滤波器结构中,跨导放大器(OTA)对线性度的要求,基于交叉耦合差分对MOS管结构中典型OTA电路的非线性特性进行研究,得到其非线性失真项。据此,提出一种基于前馈线性化原理改善OTA线性度的实现电路,给出线性化处理前后OTA传输特性的对比曲线。结果表明,通过改变结构,提高了OTA的线性度。To fulfill the linearity of a low - supply - voltage and low - power continuous time high frequeney analog integrated OTA - C filter, nonlinear characteristics of OTA is investigated. A novel structure of OTA based on principle of feed forward linearization is presented,which can improve the linearity of OTA in filter. Design and simulation results of a second-order filter are given to demonstrate its feasibility, the fact shows that the linearity of OTA is improved by changing circuit structure of OTA - C.

关 键 词：跨导放大器 线性度 滤波器 交叉耦合 

分 类 号：TN713[电子电信—电路与系统]