A 92dB 560MHz 1.5V 0.35 μm CMOS operational transconductance amplifier

Author

Adeniran, Olujide A. ; Demosthenous, Andreas

Author_Institution

Dept. of Electron. & Electr. Eng., London Univ. Coll., UK

Volume

3

fYear

2005

fDate

28 Aug.-2 Sept. 2005

Abstract

This paper describes the design of a fully-differential, 1.5 V CMOS operational transconductance amplifier (OTA) for use in a pipeline analog-to-digital converter (ADC). Post-layout simulations for a 2 pF load capacitance show that the OTA achieves a gain-bandwidth of 560 MHz at a phase margin of 62°, with 92 dB dc gain. The OTA settles to an accuracy of -69 dB in 20 ns (closed loop-gain of 4), thus facilitating its use in the implementation of the multiplying digital-to-analog (MDAC) stages of a 1.5 V, 25 MS/s 10-bit pipeline ADC. Input-referred noise is about 8 nV/√Hz, power consumption is 3.9 mW and input range is 1 V peak-to-peak differential. A standard 0.35 μm CMOS process was used for the design.

Keywords

CMOS analogue integrated circuits; analogue-digital conversion; integrated circuit design; network topology; operational amplifiers; 0.35 micron; 1.5 V; 10 bit; 2 pF; 20 ns; 3.9 mW; 560 MHz; 92 dB; CMOS operational transconductance amplifier; input-referred noise; multiplying digital-to-analog stage; pipeline analog-to-digital converter; CMOS process; Circuit topology; Gain; Germanium silicon alloys; Heterojunction bipolar transistors; Operational amplifiers; Optical design; Pipelines; Silicon germanium; Transconductance;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuit Theory and Design, 2005. Proceedings of the 2005 European Conference on

Print_ISBN

0-7803-9066-0

Type

conf

DOI

10.1109/ECCTD.2005.1523126

Filename

1523126