High-frequency two-input CMOS OTA for continuous-time filter applications

Author

Glinianowicz, J. ; Jakusz, J. ; Szczepanski, S. ; Sun, Y.

Author_Institution

Fac. of Electron., Telecommun. & Inf., Tech. Univ. Gdansk, Poland

Volume

147

Issue

1

fYear

2000

fDate

2/1/2000 12:00:00 AM

Firstpage

13

Lastpage

18

Abstract

A high-frequency fully differential CMOS operational transconductance amplifier (OTA) is presented for continuous-time filter applications in the megahertz range. The proposed design technique combines a linear cross-coupled quad input stage with an enhanced folded-cascode circuit to increase the output resistance of the amplifier. SPICE simulations show that DC-gain enhancement can be obtained without significant bandwidth limitation. The two-input OTA developed is used in high-frequency tuneable filter design based on IFLF and LC ladder simulation structures. Simulated results of parameters and characteristics of the OTA and filters in a standard 1.2 μm CMOS process (MOSIS) are presented. A tuning circuit is also discussed

Keywords

CMOS analogue integrated circuits; circuit tuning; continuous time filters; differential amplifiers; integrated circuit design; linear network synthesis; operational amplifiers; radiofrequency filters; 1.2 micron; DC-gain enhancement; HF tuneable filter design; IFLF simulation structures; LC ladder simulation structures; MOSIS process; SPICE simulations; continuous-time filter applications; design technique; folded-cascode circuit; fully differential OTA; high-frequency CMOS OTA; linear cross-coupled quad input stage; megahertz range; operational transconductance amplifier; output resistance; tuning circuit; two-input CMOS OTA;

fLanguage

English

Journal_Title

Circuits, Devices and Systems, IEE Proceedings -

Publisher

iet

ISSN

1350-2409

Type

jour

DOI

10.1049/ip-cds:20000317

Filename

836506