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From: C.D.H.Williams@exeter.ac.uk (Charles DH Williams)
Subject: Re: Spice Modeling
Date: Tue, 21 Jan 2003 12:19:27 +0000
Organization: speaking for myself...
NNTP-Posting-Date: 21 Jan 2003 12:22:20 GMT
X-Newsreader: MT-NewsWatcher 2.4.4
In article , "Jason"
> I don't know if these are the right newsgroups for this, but here it goes
> anyway. How would you describe/model a rapid single flux quantum based
> superconductor logic that uses Josephson Junctions using spice? I'm new to
> spice and would like to learn how to model RSFQ circuits in spice. Any help
> would be appreciated.
There are two approaches deopending on how serious you are.
(i) build up a subcircuit containing an equivalent circuit using the
standard entities like resistors capacitors mutual inductors and use
behavioural sources to model the Josephson equations for the junctions
(ii) implement a true spice model (in C) and compile your own verision
People have tried both. I have a feeling that one of the "Alphabet" spices
(Qspice?) does (ii).
(i) is relatively trivial (a couple of hours work) (ii) is relatively hard
(several weeks, possibly months, work)
You'll need to have a clear view as to how detailed you want the model to
be. If you want to be able to put your squids into interesting
superpositions it will be a lot harder to model than just treating each
device as a classical object with some wild non-linear behaviour.
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