A high-frequency fully differential BiCMOS operational amplifier

Author

Karanicolas, Andrew N. ; O, K.K. ; Wang, John Y A ; Lee, Hae-Seung ; Reif, Rafael L.

Author_Institution

Dept. of Electr. Eng. & Comput. Sci., MIT, Cambridge, MA, USA

Volume

26

Issue

3

fYear

1991

fDate

3/1/1991 12:00:00 AM

Firstpage

203

Lastpage

208

Abstract

A high-frequency fully differential BiCMOS operational amplifier design for use in switched-capacitor circuits is presented. The operational amplifier is integrated in a 3.0-GHz, 2-μm BiCMOS process with an active die area of 1.0 mm×1.2 mm. This BiCMOS op amp offers an infinite input resistance, a DC gain of 100 dB, a unity-gain frequency of 90 MHz with 45° phase margin, and a slew rate of 150 V/μs. The differential output range is 12 V. The circuit is operated from a ±5-V power supply and dissipates 125 mW. The op amp is unity-gain stable with 7 pF of capacitive loading at each output. The op amp is a two-stage, pole-split frequency compensated design that uses a PMOS input stage for infinite input resistance and an n-p-n bipolar second stage for high gain and high bandwidth. The frequency compensation network serves both the differential- and common-mode amplifiers so the differential- and common-mode amplifier dynamics are similar. A dynamic switched-capacitor common-mode feedback scheme is used to set the output common-mode level of the first and second stages

Keywords

BIMOS integrated circuits; linear integrated circuits; operational amplifiers; switched capacitor networks; 100 dB; 125 mW; 2 micron; DC gain; PMOS input stage; active die area; bandwidth; capacitive loading; common-mode amplifiers; differential mode; differential output range; frequency compensation network; fully differential BiCMOS operational amplifier; infinite input resistance; pole-split frequency; slew rate; switched-capacitor circuits; unity-gain frequency; Analog circuits; BiCMOS integrated circuits; CMOS analog integrated circuits; CMOS logic circuits; CMOS process; Differential amplifiers; Frequency; MOS devices; Operational amplifiers; Switching circuits;

fLanguage

English

Journal_Title

Solid-State Circuits, IEEE Journal of

Publisher

ieee

ISSN

0018-9200

Type

jour

DOI

10.1109/4.74997

Filename

74997