A 1.5-V high drive capability CMOS op-amp

Author

Palmisano, G. ; Palumbo, G. ; Salerno, R.

Author_Institution

Dipt. Elettrico e Sistemistico, Catania Univ., Italy

Volume

34

Issue

2

fYear

1999

fDate

2/1/1999 12:00:00 AM

Firstpage

248

Lastpage

252

Abstract

A novel CMOS operational amplifier with a 1.5 V power supply is presented. It is based on a folded-mirror transconductance amplifier and a high-efficiency output stage. The amplifier achieves an open-loop gain and a gain-bandwidth product higher than 65 dB and 1 MHz, respectively. In addition, a 1 V peak-to-peak output voltage into a 500 Ω and 50 pF output load is provided with a total harmonic distortion of -77 dB. This performance was achieved using maximum aspect ratios of 120/1.2 and 360/1.2 for the NMOS and PMOS transistors, respectively, and a quiescent current as low as 60 μA for the driver transistors. The amplifier was implemented in a standard 1.2 μm CMOS process with threshold voltages around 0.8 V. It dissipates less than 300 μW

Keywords

CMOS analogue integrated circuits; differential amplifiers; harmonic distortion; integrated circuit design; low-power electronics; operational amplifiers; 0.8 V; 1.2 micron; 1.5 V; 300 muW; 60 muA; 65 dB; CMOS op-amp; CMOS operational amplifier; THD; folded-mirror transconductance amplifier; high drive capability; high-efficiency output stage; low-voltage design; quiescent current; total harmonic distortion; CMOS process; Driver circuits; MOS devices; MOSFETs; Operational amplifiers; Power amplifiers; Power supplies; Total harmonic distortion; Transconductance; Voltage;

fLanguage

English

Journal_Title

Solid-State Circuits, IEEE Journal of

Publisher

ieee

ISSN

0018-9200

Type

jour

DOI

10.1109/4.743789

Filename

743789