A high speed fully differential CMOS opamp

Author

Younis, Ahmed ; Hassoun, Marwan

Author_Institution

Dept. of Electr. & Comput. Eng., Iowa State Univ., Ames, IA, USA

Volume

2

fYear

2000

fDate

2000

Firstpage

780

Abstract

A high-speed fully differential folded cascode operational amplifier is presented. The operational amplifier uses fully differential boosting amplifiers to increase the open loop gain of the opamp. The opamp has a CMFB circuit that is made of a switched capacitor circuit and a continuous time CMFB circuit. The boosting amplifiers have continuous time CMFBs. The opamp is designed in TSMC 0.25 u digital CMOS process with 2.5 V power supply and achieved a dc gain of 81 dB with a 680 MHz unity gain frequency and 30 mW power consumption

Keywords

CMOS analogue integrated circuits; circuit feedback; continuous time systems; current-mode circuits; differential amplifiers; high-speed integrated circuits; switched capacitor networks; 0.25 micron; 2.5 V; 30 mW; 680 MHz; 81 dB; CMFB circuit; DC gain; boosting amplifier; continuous time circuit; high-speed fully-differential folded cascode CMOS operational amplifier; open-loop gain; power consumption; switched capacitor circuit; unity gain frequency; Boosting; CMOS process; Differential amplifiers; Energy consumption; Frequency; Operational amplifiers; Power supplies; Process design; Switched capacitor circuits; Switching circuits;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2000. Proceedings of the 43rd IEEE Midwest Symposium on

Conference_Location

Lansing, MI

Print_ISBN

0-7803-6475-9

Type

conf

DOI

10.1109/MWSCAS.2000.952872

Filename

952872