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An Efficient Time-Domain Simulation Method for Multirate RF Nonlinear Circuits

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2 Author(s)
Oliveira, J.F. ; Electr. Eng. Dept., Inst. Politecnico de Leiria, Leiria, Portugal ; Pedro, J.C.

This paper describes a new computer-aided design tool especially conceived for the efficient time-domain simulation of highly heterogeneous nonlinear wireless communication circuits, i.e., combining RF and baseband analog circuitry and digital components. Using multirate Runge-Kutta algorithms within a multi time framework, to benefit from the different rates of variation of slowly varying (latent) and fast-varying (active) currents and voltages (state variables), we managed to solve the envelope transient regime of circuits excited by AM and PM RF carriers, in a highly efficient way. Indeed, with the adoption of convenient sampling rates for the multiple time representations of the slowly varying and fast-varying state variables, gains of more than one order of magnitude in simulation time are reported, even for an illustrative circuit example of very small size.

Published in:

Microwave Theory and Techniques, IEEE Transactions on  (Volume:55 ,  Issue: 11 )

Date of Publication:

Nov. 2007

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