A 124-dB double-gain-boosted cascode amplifier with 92% rail-to-rail output swing

Author

Ho, Marco ; Shi Bu ; Yanqi Zheng ; Ka Nang Leung ; Jianping Guo

Author_Institution

Dept. of Electron. Eng., Chinese Univ. of Hong Kong, Hong Kong, China

fYear

2014

fDate

17-20 Nov. 2014

Firstpage

181

Lastpage

184

Abstract

A CMOS amplifier with 124-dB dc gain and 92% rail-to-rail output swing is proposed in this paper. The proposed amplifier uses double gain-boosting technique, enabling triode-region operation in cascode output stage. The design is fabricated in a commercial 0.35-μm CMOS technology. The active chip area is 84 μm × 170 μm. Experimental results show that with the supplies of ±1 V, the high-gain region is extended beyond -0.93 V and 0.91 V. The unity-gain frequency is about 300 kHz with a phase margin of 65° when driving a loading capacitor of 100 pF. Signal distortion is significant reduced compared to the conventional design due to extension of the high-gain region in the proposed amplifier.

Keywords

CMOS analogue integrated circuits; amplifiers; distortion; CMOS amplifier; capacitance 100 pF; cascode output stage; double gain-boosting technique; double-gain-boosted cascode amplifier; gain 124 dB; rail-to-rail output swing; signal distortion; size 0.35 mum; triode-region operation; unity-gain frequency; voltage -1 V to 1 V; Boosting; Capacitors; Frequency measurement; Gain; Rail to rail amplifiers; Resistance; Transistors;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems (APCCAS), 2014 IEEE Asia Pacific Conference on

Conference_Location

Ishigaki

Type

conf

DOI

10.1109/APCCAS.2014.7032751

Filename

7032751