An improved nonlinear macromodel of OTA

Author

Sun, Qing-Lin ; Liu, Jian-You ; Liu, Mei-Lun

Author_Institution

Tianjin Inst. of Technol., China

fYear

1991

fDate

16-17 Jun 1991

Firstpage

906

Abstract

A new nonlinear macromodel for operational transconductance amplifier (OTA) is presented. It is developed by the `build-up´ technique. Typical parameters, such as differential and common mode input impedance, CMRR, slew rate, and the bias current effect, are taken into account. Model parameters can be calculated from the data sheets supplied by the manufacturers or chosen arbitrarily by the user. The main improvement of the model is that the authors introduce a nonlinear VCCS expressed by a polynomial to simulate the saturation characteristics, so that the nonlinear macromodel is very suitable for SPICE simulation. The results of simulations have proved the adequacy of the macromodel

Keywords

circuit analysis computing; differential amplifiers; equivalent circuits; nonlinear network analysis; operational amplifiers; CMRR; OTA; SPICE simulation; bias current effect; common mode input impedance; differential mode input impedance; model parameters; nonlinear VCCS; nonlinear macromodel; operational transconductance amplifier; polynomial; saturation characteristics; slew rate; Circuits; Frequency; Impedance; Operational amplifiers; Polynomials; Resistors; SPICE; Transconductance; Voltage control; Voltage-controlled oscillators;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 1991. Conference Proceedings, China., 1991 International Conference on

Conference_Location

Shenzhen

Type

conf

DOI

10.1109/CICCAS.1991.184509

Filename

184509