A low power constant-Gm rail-to-rail operational transconductance amplifier by recycling current

Author

Zhao, Xiao ; Fang, Huajun ; Xu, Jun

Author_Institution

Inst. of Microelectron., Tsinghua Univ., Beijing, China

fYear

2011

fDate

17-18 Nov. 2011

Firstpage

1

Lastpage

2

Abstract

A modification to the conventional constant-g_m rail-to-rail operational transconductance amplifier is presented. The proposed amplifier has the benefit of delivering the same performance while consuming a fraction of the power compared to the conventional rail-to-rail amplifier. This is achieved by recycling the bias current of idle devices, which results in an enhanced transconductance, gain and slew rate. The proposed amplifier was implemented in SMIC standard 65nm CMOS process. Simulation results show that the proposed amplifier achieves 168.1MHz unity-gain bandwidth, 63.8dB DC gain, 23.4V/us slew rate and less than 8% deviation in transconductance, but the power consumption reduced by 50% compared to the conventional rail-to-rail amplifier with the same design specifications.

Keywords

CMOS analogue integrated circuits; operational amplifiers; CMOS process; SMIC standard; bandwidth 168.1 MHz; low power constant-Gm rail-to-rail operational transconductance amplifier; recycling current; size 65 nm; voltage 23.4 V; CMOS process; Gain; Mirrors; Power demand; Recycling; Transconductance; Transistors;

fLanguage

English

Publisher

ieee

Conference_Titel

Electron Devices and Solid-State Circuits (EDSSC), 2011 International Conference of

Conference_Location

Tianjin

ISSN

Pending

Print_ISBN

978-1-4577-1998-1

Electronic_ISBN

Pending

Type

conf

DOI

10.1109/EDSSC.2011.6117572

Filename

6117572