Pulse-width-modulation and the Baxandall Class-D oscillator

Back in March I posted a short comment on using pulse-width modulation
to improve the Baxandall Class-D oscillator


http://groups.google.com/group/sci.electronics.design/msg/a47c2f7e1fc...


I got some useful reactions.

Since then I've spent some time modelling the circuit in LTSpice.

Anybody interested in the results can see them on my web-site

www.sophia-elektronica.com

You've got to go to the bottom of the page and click on "examples" to
get to the good stuff, and that only takes you to a page showing the
resutls of simulatiing the classic Baxandall Class-D oscillator. You've
got to get to the bottom of that page before you find the links to the
interesting stuff.

I could do a bit more modelling in LTSpice, but first I'd need to work
up an eight- or nine-bit synchronous counter - the four bit counter I
put together eventually worked fine, but it took me long enough to get
the bugs out of that I hesitant about modelling anything bigger.

I'd be grateful to a pointer to counter sub-circuit for LTSpice.

--
Bill Sloman, Nijmegen

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