A nonlinear macromodel for CMOS OTAs

Author

Gómez, Gabriel J. ; Embabi, S.H.K. ; Sánchez-Sinencio, Edgar ; Lefebvre, Martin C.

Author_Institution

Dept. of Electr. Eng., Texas A&M Univ., College Station, TX, USA

Volume

2

fYear

1995

fDate

30 Apr-3 May 1995

Firstpage

920

Abstract

A nonlinear parameterizable macromodel for CMOS Operational Transconductance Amplifiers (OTAs) is presented. The macromodel captures the DC, AC and large signal features of the transistor level original circuit, thus modeling accurately its time domain and nonlinear performance. The main contribution of this work is to account for the bias-dependent transconductance nonlinearities in the circuit, by curve-fitting the desired output characteristics with n-dimensional polynomials. The model can also account for the nonlinear dependence of the circuit´s characteristics on several design parameters. The applicability of the model is demonstrated by modeling the response of an OTA-C filter

Keywords

CMOS analogue integrated circuits; curve fitting; integrated circuit modelling; nonlinear network analysis; operational amplifiers; polynomials; CMOS OTAs; OTA-C filter; Operational Transconductance Amplifiers; curve fitting; n-dimensional polynomials; nonlinear macromodel; time domain; transconductance nonlinearities; transistor circuit; CMOS technology; Circuit simulation; Computational modeling; Convergence; Impedance; Integrated circuit modeling; Poles and zeros; Polynomials; Semiconductor device modeling; Transconductance;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 1995. ISCAS '95., 1995 IEEE International Symposium on

Conference_Location

Seattle, WA

Print_ISBN

0-7803-2570-2

Type

conf

DOI

10.1109/ISCAS.1995.519915

Filename

519915