Low Voltage Differential Input Stage With Improved CMRR and True Rail-to-Rail Common Mode Input Range

被引：8

作者：

Ramirez-Angulo, Jaime ^{[1
]}

Balasubramanian, Sandhana ^{[1
]}

Lopez-Martin, Antonio J. ^{[3
]}

Carvajal, Ramon G. ^{[2
]}

机构：

[1] New Mexico State Univ, Klipsch Sch Elect Engn, Las Cruces, NM 88003 USA

[2] Univ Seville, Escuela Super Ingn, Sevillelsla De La Cartuj 41092, Spain

[3] Univ Publ Navarra, Dept Ingn Elect & Elect, Pamplona 31080, Spain

来源：

IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS | 2008年 / 55卷 / 12期

关键词：

Analog integrated circuits; operational amplifiers; low voltage; common mode rejection ratio (CMRR);

D O I：

10.1109/TCSII.2008.2009961

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

A scheme for low voltage rail-to-rail operation with improved common mode rejection ratio is introduced. It can operate with single supply voltages close to a transistor's threshold voltage and it is very compact and power efficient. It is based on a differential amplifier with floating gate input transistors featuring dynamical adjustment of a floating gate biasing voltage. This reduces significantly common mode voltage variations at the input terminals of the differential pair. The implementation of single ended two stage class AB operational amplifiers based on this scheme is discussed. Experimental results of a test chip in 0.5 mu m CMOS technology that validates the proposed scheme are presented.

引用

页码：1229 / 1233

页数：5

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