A transconductance enhancement technique for bulk-driven OTAs working in weak inversion

被引：3
|
作者：
Cheng, Shuangshuang [1 ]
Zhang, Qisheng [1 ,2 ]
Zhao, Xiao [1 ]
机构：
[1] China Univ Geosci, Sch Geophys & Informat Technol, Beijing 100083, Peoples R China
[2] China Univ Geosci, Key Lab Geodetect, Minist Educ, Beijing, Peoples R China
来源：
IEICE ELECTRONICS EXPRESS | 2016年 / 13卷 / 14期
基金：
中国国家自然科学基金;
关键词：
transconductance enhancement; bulk-driven; weak inversion; positive feedback differential pair; OTA; CMOS;
D O I：
10.1587/elex.13.20160475
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 proposed transconductance enhancement technique for bulk-driven OTAs working in weak inversion is presented in this paper. The basic idea is to use a bulk-driven input differential pair employing the auxiliary amplifier and positive feedback technique to enhance transconductance, which improves the enhancement ratio of transconductance from (n + 1)/(n - 1) to (n + 2)/(n - 1). The proposed amplifier based on the mentioned technique is simulated on UMC 180 nm process with the help of Spectre. The simulation results demonstrate that the transconductance of the bulk-driven OTAs working in weak inversion improves almost 50% with just a little increased power consumption compared to the conventional counterparts.
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页数：7
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