Title :
An improved nonlinear macromodel of OTA
Author :
Sun, Qing-Lin ; Liu, Jian-You ; Liu, Mei-Lun
Author_Institution :
Tianjin Inst. of Technol., China
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;
Conference_Titel :
Circuits and Systems, 1991. Conference Proceedings, China., 1991 International Conference on
Conference_Location :
Shenzhen
DOI :
10.1109/CICCAS.1991.184509
