A gain-enhanced two-stage fully-differential CMOS op amp with high unity-gain bandwidth

Author

Sun, Runhua ; Peng, Lindsay

Author_Institution

Appl. Micro Circuits Corp., San Diego, CA, USA

Volume

2

fYear

2002

fDate

2002

Abstract

This paper presents a gain-enhanced two-stage fully differential CMOS op amp. A very high dc gain is achieved together along with a very high unity-gain bandwidth and low power dissipation. The pole-zero doublet arising from the gain-enhancement is analyzed in detail. The side effects of the gain-enhancement circuit are minimized. The frequency responses indicate that more than 120 dB open loop dc gain and 500 MHz unity-gain bandwidth are obtained. The simulated settling behavior shows that it only takes 13.5 ns to reach more than 120 dB settling accuracy. To date, this is one of the best high-performance op amps that have been reported

Keywords

CMOS analogue integrated circuits; differential amplifiers; frequency response; low-power electronics; operational amplifiers; poles and zeros; 120 dB; 13.5 ns; 500 MHz; CMOS; frequency responses; gain-enhanced two-stage fully-differential amplifier; op amp; pole-zero doublet; power dissipation; settling behavior; unity-gain bandwidth; Bandwidth; Circuits; Differential amplifiers; Frequency; MOS devices; Operational amplifiers; Performance gain; Power dissipation; Sun; Tail;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2002. ISCAS 2002. IEEE International Symposium on

Conference_Location

Phoenix-Scottsdale, AZ

Print_ISBN

0-7803-7448-7

Type

conf

DOI

10.1109/ISCAS.2002.1011016

Filename

1011016