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An Improved and Generalized Diode Clipper Model for Wave Digital Filters

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References

2015

Year

Kurt James Werner, Vaibhav Nangia, Alberto Bernardini, Julius O. Smith, Augusto Sarti
Virtual Community of Pathological Anatomy (University of Castilla La Mancha)

Abstract

We derive a novel explicit wave-domain model for “diode clipper" circuits with an arbitrary number of diodes in each orientation, applicable, e.g., to wave digital filter emulation of guitar distortion pedals. Improving upon and generalizing the model of Paiva et al. (2012), which approximates reverse-biased diodes as open circuits, we derive a model with an approximated correction term using two Lambert W functions. We study the energetic properties of each model and clarify aspects of the original derivation. We demonstrate the model's validity by comparing a modded Tube Screamer clipping stage emulation to SPICE simulation.