Operational amplifier with 1-V rail-to-rail multipath-driven output stage

Author

Fonderie, J. ; Huijsing, Johan H.

Author_Institution

Dept. of Electr. Eng., Delft Univ. of Technol., Netherlands

Volume

26

Issue

12

fYear

1991

fDate

12/1/1991 12:00:00 AM

Firstpage

1817

Lastpage

1824

Abstract

A bipolar operational amplifier (op amp) with a rail-to-rail multipath-driven output stage that operates at supply voltages down to 1 V is presented. The bandwidth of this output stage is as high as possible, viz, equal to that of one of the output transistors, loaded by the output capacitance. The output voltage can reach both supply rails within 100 mV and the output current is ±15 mA. The op amp is designed to be loaded by a 100-pF capacitor and the unity-gain bandwidth is 3.4 MHz at a 60° phase margin. The voltage gain is 117 dB and the CMRR is 100 dB. The frequency behavior of the multipath-driven (MPD) topology has an improved performance when compared to that of previously presented low-voltage output stages. A figure of merit F_M for low-voltage op amps has been defined as the bandwidth-power ratio

Keywords

bipolar integrated circuits; linear integrated circuits; operational amplifiers; -15 mA; 1 V; 117 dB; 15 mA; 3.4 MHz; bandwidth-power ratio; bipolar operational amplifier; low-voltage op amps; multipath-driven output stage; Bandwidth; Capacitance; Capacitors; Frequency; Gain; Operational amplifiers; Rail to rail amplifiers; Rail to rail operation; Rail to rail outputs; Voltage;

fLanguage

English

Journal_Title

Solid-State Circuits, IEEE Journal of

Publisher

ieee

ISSN

0018-9200

Type

jour

DOI

10.1109/4.104173

Filename

104173