Modeling of nonlinear active regions in TLM (distributed circuits)

Author

Russer, Peter ; So, Poman P M ; Hoefer, Wolfgang J R

Author_Institution

Lehrstuhl fuer Hochfrequenztech., Tech. Univ., Munchen, West Germany

Volume

1

Issue

1

fYear

1991

Firstpage

10

Lastpage

13

Abstract

A transmission line matrix (TLM) method for modeling distributed circuits containing nonlinear active elements and structures is demonstrated. The scattering properties of the nonlinear element are expressed in terms of differential equations that are solved by stepwise integration with the time step of the TLM algorithm. A cavity oscillator with an active diode with a finite cutoff frequency has been modeled. Spurious oscillations of the TLM mesh that regularly occur when including negative conductivity or pulse reflection coefficients larger than unity were effectively suppressed.<>

Keywords

S-matrix theory; distributed parameter networks; microwave oscillators; nonlinear network analysis; solid-state microwave circuits; transmission line theory; TLM algorithm; TLM mesh; active diode; cavity oscillator; differential equations; distributed circuits; microwave circuits; modeling; negative conductivity; nonlinear active regions; pulse reflection coefficients; scattering properties; spurious oscillations suppression; stepwise integration; transmission line matrix; Admittance; Circuits; Conductivity; Cutoff frequency; Electromagnetic modeling; Joining processes; Power transmission lines; Transmission line matrix methods; Transmission lines; Voltage;

fLanguage

English

Journal_Title

Microwave and Guided Wave Letters, IEEE

Publisher

ieee

ISSN

1051-8207

Type

jour

DOI

10.1109/75.80676

Filename

80676