[sdiy] Couple of OTA questions

[Cornutt, David K]

I'm still trying to get my head wrapped around how OTA's work
so that I can build a couple of circuits that I have ideas for.
A couple of questions:

1.  The OTA tries to source/sink a current that is proportional to the 
difference of the inputs, and the amplifier bias current.  What if the 
output is presented with an open circuit?  Will it maintain a voltage 
that is proportional to the inputs?  Or will it try to rise to the
supply rail?

2.  Given the scarcity of in-production OTAs, I've been looking at the
Burr-Brown one (OPA630 IIRC).  It has a pinout that's quite different
from what I'm used to seeing.  It's arranged to try to make it look like
a discrete transistor -- there are pins labeled as "collector",
"emitter",
and "base".  The data sheet mentions that it is intended to emulate
an "ideal transistor", whatever that means.  I can sort of understand
it if you take the "base" to be the equivalent of the inputs on, say,
a 3280 (ignoring the fact that they aren't differential inputs), and the
"emitter" is equal to the output.  But what role does the "collector"
play?  Is it equivalent to the Iabc input of a 3280?  And for that
matter, if something is labeled as being a "base", would that not
imply that it expects a current rather than voltage input -- which
would make it not really an OTA, since then it wouldn't be a
transconductance device?