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Mike, there is a super active Yahoo group that can help you I am sure. I joined that group, but most of it is way over my head. There is a German guy named Helmut that is the driving force behind it who is way smart on how to get it to do anything you want. Hope this helps.
Bob
Mike, if you trust U2, U4, and U5 to work as designed, why not replace sig1, sig2, and sig3 with voltage sources?
As Eric pointed out, zero rise and fall times are not a good idea.
hi Mike,
I would get the MCP6002 rail2rail OPA from the Yahoo LTspice user group web page.
The CA3140 is a modified model that I use for ~0Vout thru to Vdd-1.5Vout.... I tweak the models parameters as required to make it 'similar' to any device I am working on.
BTW: the MCP6002 dual costs only around 50p in the UK, so its a handy OPA to have on your work bench, it also comes in a quad version.
I would suggest that you dont use nanosec rise/clock times when using LTS.
I usually start off at 1uSec or 0.1uS.
another tip: use the generic parametric opamp to get your circuit initially running. Substitute specific OpAmp models only after the basic circuit functions to your satisfaction...
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