Thank you Kurt for your kind words. Anyway I need to give credit to Rafael Cauduro Dias de Paiva for the original idea and the modeling of the opamp-based topology. My contribution in that paper was mostly related to diode modeling and usage of the Lambert W function.
And since we're here, I want to say that I completely agree on all you've said and suggest everybody to take a deep look at your excellent work. Stefano Il giorno gio 12 mar 2020 alle ore 16:43 Kurt James Werner < kurt.james.wer...@gmail.com> ha scritto: > I agree that Stefano's dissertation is a very good introduction to WDFs. > Much of my own doctoral work was inspired by his excellent paper on WDF > diode and op-amp modeling, which is as far as I know the first time active > devices (op-amp) and complex non-series/parallel topologies (the op-amp's > feedback structure) had been modeling using WDFs—a very exciting > development because historically (Fettweis era) they had been associated > with passive circuits only. > > Most of my own papers and dissertation relate to expanding the class of > circuits that can be modeled using WDFs, building on Stefano's work > to enable the WDF formalism to handle complex topologies ~in general~ and > circuits involving active devices ~in general~ in a systematic fashion. In > my opinion, this work brings WDFs up to the same level of suitability as > State Space and MNA modeling. In my opinion, WDFs are not the clear winner: > each one has advantages and disadvantages which come into play in different > ways in different circuits, meaning none of the formalisms is the best for > ~all~ circuits. > > As a side effect of my topological findings, I also came up with a new > technique for modeling circuits with multiple nonlinearities. Again, I > would not say that the technique is ~superior~ to state-space or MNA > modeling, just that it allows WDFs to be structurally compatible with > multiple NLs and brings them up to a similar level of potential usefulness. > It still requires a Newton solver or table lookup, just like all the other > formalisms. There are also some even articles by Alberto Bernardini and > Timothey Schwertdfeger that take a similar approach to handling multiple > NLs, which seem to have some advantages over my technique. > > Here are links to some of my work on WDFs for your reference: > —PhD diss, w/ most results up to 2016, TR808 bass drum as overarching case > study: https://searchworks.stanford.edu/view/11891203 > —IEEE article with most up-to-date and general formulation of handling > complex topologies with generalized wave definition: > https://www.researchgate.net/publication/325566665_Modeling_Circuits_With_Arbitrary_Topologies_and_Active_Linear_Multiports_Using_Wave_Digital_Filters > —DAFx proceedings (many WDF papers including mine): > https://www.dafx.de/paper-archive/ > > All the best, > Kurt James Werner > _______________________________________________ > dupswapdrop: music-dsp mailing list > music-dsp@music.columbia.edu > https://lists.columbia.edu/mailman/listinfo/music-dsp
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