[sdiy] free simulator and analog design pdf book

[Ryan Williams]

hi,

just noticed today that the book 'Designing Analog Chips' was updated 
not too long ago.  I've skimmed through most of it and read about half 
of it (an older version). I think it is well written and covers some 
topics I haven't seen much about. so, I reccomend this to people who 
want to learn more about analog design:
http://www.arraydesign.com/downloads/index.html

I know people have asked about simulators before and I've been playing 
with Simetrix today. It is the one used for the examples in the book 
above.  They have a free version.  It is limited in circuit size, 120 
nodes, which is pretty good except all of the nodes inside opamps are 
counted. So a circuit is limited to atmost 5 TL072s. but, it can do all 
the different sorts of analysis modes that the free CircuitMaker can't. 
I plan on using this primarily. also, on the book web page above there 
is a link for a whole bunch of example bipolar circuits. here is simetrix:
http://www.catena.uk.com/

-ryan