Title :
Effects of weak nonlinearities in transconductance-capacitor filters
Author :
Szczepanski, Stanislaw ; Schaumann, Rolf
Author_Institution :
Inst. of Electron. Technol., Tech. Univ. of Gdansk, Poland
Abstract :
Effects caused by weak nonlinearities of operational transconductance amplifiers (OTAs) on the performance of continuous-time OTA-capacitor (TAC) filters are investigated. Nonlinear phenomena, such as compression/expansion and desensitization, and their effects on the frequency responses of TAC filters are discussed. The Volterra series method is used to represent filters by their nonlinear transfer functions for steady-state analysis and simulation. Using this approach, distortion and interference criteria are given for analytically predicting the onset of nonlinear behavior and for establishing appropriate design guidelines. Representative simulation results are included
Keywords :
active filters; equivalent circuits; nonlinear network analysis; TAC filters; Volterra series method; compression expansion effects; continuous time OTA capacitor filters; desensitization; design guidelines; frequency responses; interference criteria; nonlinear equivalent circuits; nonlinear phenomena; nonlinear transfer functions; onset of nonlinear behavior; operational transconductance amplifiers; simulation results; steady-state analysis; transconductance-capacitor filters; weak nonlinearities; Analytical models; Filters; Frequency; Guidelines; Interference; Nonlinear distortion; Operational amplifiers; Steady-state; Transconductance; Transfer functions;
Conference_Titel :
Circuits and Systems, 1989., IEEE International Symposium on
Conference_Location :
Portland, OR
DOI :
10.1109/ISCAS.1989.100533
