线性可调全差分OTA的实现
Realization of linearly tunable fully differential OTA
李志军 1曾以成2
作者信息
- 1. 湘潭大学信息工程学院,湖南湘潭411105;湘潭大学智能计算与信号处理教育部重点实验室,湖南湘潭411105
- 2. 湘潭大学光电工程系,湖南湘潭411105
- 折叠
摘要
为了解决CMOS OTA跨导增益不能线性调节的问题,本文采用AB电流镜对NMOS和PMOS差分对管实现的基本OTA进行电流偏置,从而实现了一个跨导增益可以宽幅线性调节的全差分CMOS OTA电路.提出的OTA能够通过调节外部电流Iadj实现线性调节跨导增益,其误差小于2％,外部电流Iadj的调节范围为-40μA～40μA.OTA的差分输入电压摆幅为200mVp-p,输出电流的非线性度小于1.2％.电路的性能通过PSPICE仿真得到了验证.
Abstract
A CMOS operational trans-conductance amplifier (OTA) which trans-conductance gain can be electronically and linearly tuned is proposed in this paper.The realization method is achieved by biasing the two balanced CMOS OTAs with AB current mirror.The trans-conductance gain of the proposed OTA can be linearly adjusted through an external bias current,Iadj,for two decades with less than 2％ error.The linear adjusting rang of Iadj is from-40μA to 40μtA.The input-voltage range of about 200mVp-p with less than 1.2％ nonlinearity is obtained.The performance of the proposed OTA is discussed and confirmed through PSPICE simulation results.
关键词
AB电流镜/跨导线性/OTA/跨导增益/线性可调Key words
Class-AB current mirror/trans-linear/OTA/trans-conductance/linearly tunable引用本文复制引用
基金项目
国家自然科学基金(61176032)
湖南省重点学科资助项目()
出版年
2013
NETL
NSTL
维普
万方数据