[sdiy] Some OTA questions

[Jeff Farr]

Jim, thanks, those are perfect.

"Basically Id will allow you to use a higher level signal in"

This will improve it's usefulness as a VCR as well, right?  Looks like
I've got some breadbording to do..  I'm still not clear on the
relationship between Vdiff and Iout in the S&H circuit, it still seems
to me that if Vdiff is enough for one of the transistors in the first
mirror to be all the way open (which happens at a fairly low voltage)
then the output current is largely unaffected by the input voltage and
is really just Ic.  I'm not shure how the circuit maintains a direct
relationship between Vdiff and Vcap and there is no circuitry after
the FET to re-scale Vcap so that it fits with Vdiff.. Perhaps I'm
looking to much into it, or too little into it.