Title :
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
fDate :
30 Apr-3 May 1995
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;
Conference_Titel :
Circuits and Systems, 1995. ISCAS '95., 1995 IEEE International Symposium on
Conference_Location :
Seattle, WA
Print_ISBN :
0-7803-2570-2
DOI :
10.1109/ISCAS.1995.519915
