A novel constant-gm rail-to-rail input stage for operational amplifiers

被引：0

作者：

Chen, Zhizhi ^{[1
,2
]}

Wang, Qian ^{[1
]}

Li, Xi ^{[1
]}

Song, Sannian ^{[1
]}

Chen, XiaoGang ^{[1
]}

Chen, HouPeng ^{[1
]}

Song, Zhitang ^{[1
]}

机构：

[1] Chinese Acad Sci, Shanghai Inst Microsyst & Informat Technol, State Key Lab Mat Integrated Circuits, 865 Changning Rd, Shanghai 200050, Peoples R China

[2] Univ Chinese Acad Sci, Sch Microelect, Beijing 100049, Peoples R China

来源：

IEICE ELECTRONICS EXPRESS | 2023年 / 20卷 / 15期

关键词：

rail-to-rail; constant-gm; operational amplifier; common-mode range; low voltage; LEAKAGE CURRENT;

D O I：

10.1587/elex.20.20230270

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 novel constant-gm rail-to-rail input stage for CMOS operational amplifier is presented in this paper. The input stage mainly consists of a PMOS transistors differential pair and a NMOS transistors differential pair placed in parallel as a rail-to-rail differential input stage and the tail currents of the two differential pairs are controlled by a PMOS and a NMOS common-mode voltage sensor respectively. The gm of the input stage of the operational amplifier could be a constant value within the input common-mode voltage. The simulation result shows that when the power supply voltage is 1.8V and 3.3V respectively, the gm variation in the entire input range (0-1.8V or 0-3.3V) is within & PLUSMN; 1.38% and & PLUSMN; 3.38%. The power dissipation is 36.9 & mu;W and 51.74 & mu;W. SMIC 55nm CMOS process and Cadence SPECTRE simulator are used to layout and simulate this work.

引用

页码：1 / 6

页数：6

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