Implementing high-order continuity and rate dependence in SPICE models

A. E. Parker*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


Two proposed techniques simplify and improve the implementation of SPICE device models. The first technique uses nested transformation of node potentials. It avoids the discontinuity in high-order derivatives that is typical of implementations that use conditional functions. This provides the smooth mathematical form required for distortion and intermodulation analysis, and improves simulator convergence. The second technique uses state variables to implement descriptions of rate dependent and thermal transient behaviour. This simplifies model implementation by eliminating the need for extra circuit nodes. The paper demonstrates the proposed techniques by describing the implementation of an advance MESFET model. The techniques will provide models that can simulate the intermodulation and transient behaviour of high-performance communication and signal processing circuits.

Original languageEnglish
Pages (from-to)251-257
Number of pages7
JournalIEE Proceedings: Circuits, Devices and Systems
Issue number4
Publication statusPublished - Aug 1994

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