High-speed BiCMOS operational amplifier for switched-capacitor circuits

Author

Baschirotto, A. ; Alini, R. ; Castello, R. ; Montecchi, F.

Author_Institution

Dipartimento di Elettronica, Univ. di Padova, Italy

fYear

1993

fDate

3-6 May 1993

Firstpage

998

Abstract

A high-speed fully-differential operational amplifier (op-amp) realized in 2-μ BiCMOS technology is proposed. Input MOS buffers allow the use of this op-amp in switched capacitor (SC) circuits with high clock frequency (up to 75 MHz). The gain stage is realized with resistively-loaded bipolar devices. No common mode feedback is required. This saves area and power and increases speed. The op-amp presents a DC gain of about 46 dB with a unity-gain frequency as large as 700 MHz with 1.5 pF load. The measured performance of closed-loop settling time (1%) is about 12 ns

Keywords

BiCMOS analogue integrated circuits; differential amplifiers; feedback amplifiers; operational amplifiers; switched capacitor networks; 1.5 pF; 12 ns; 2 micron; 46 dB; 700 MHz; 75 MHz; BiCMOS operational amplifier; DC gain; MOS buffers; clock frequency; closed-loop settling time; fully-differential operational amplifier; gain stage; resistively-loaded bipolar devices; speed; switched-capacitor circuits; unity-gain frequency; BiCMOS integrated circuits; Circuit testing; Clocks; Feedback; Frequency; Operational amplifiers; Performance gain; Resistors; Switched capacitor circuits; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 1993., ISCAS '93, 1993 IEEE International Symposium on

Conference_Location

Chicago, IL

Print_ISBN

0-7803-1281-3

Type

conf

DOI

10.1109/ISCAS.1993.393892

Filename

393892