Opamp with 106 dB DC gain in 120nm digital CMOS

Author

Schlögl, F. ; Zimmermann, H.

Author_Institution

Inst. fur elektrische Mess-und Schaltungstechnik, Technische Univ. Wien, Austria

fYear

2003

fDate

16-18 Sept. 2003

Firstpage

381

Lastpage

384

Abstract

A three-stage operational amplifier employing only regular-threshold devices in a 120nm digital CMOS technology with a gain-boosted folded-cascode input stage and a class AB rail-to-rail output stage is presented. The gain boost results in a low-frequency differential gain of 106dB at a supply voltage of 1.2V. A bulk regulator of the input transistors increases the input-voltage range to -0.1...+1.0V. A gain-bandwidth product of 57MHz and a phase margin of 71/spl deg/ are measured for loads of 5.5pF.

Keywords

CMOS digital integrated circuits; operational amplifiers; -0.1 to 1.0 V; 1.2 V; 106 dB; 120 nm; 5.5 pF; bulk regulator; class AB rail-to-rail output stage; digital CMOS technology; gain-boosted folded-cascode input stage; low-frequency differential gain; regular-threshold devices; three-stage operational amplifier; Analog circuits; Breakdown voltage; CMOS technology; Differential amplifiers; Digital circuits; Operational amplifiers; Power amplifiers; Power supplies; Threshold voltage; Transistors;

fLanguage

English

Publisher

ieee

Conference_Titel

Solid-State Circuits Conference, 2003. ESSCIRC '03. Proceedings of the 29th European

Conference_Location

Estoril, Portugal

Print_ISBN

0-7803-7995-0

Type

conf

DOI

10.1109/ESSCIRC.2003.1257152

Filename

1257152