[sdiy] Couple of OTA questions

[Cornutt, David K]

> From: ASSI [mailto:Stromeko at compuserve.de] 
> 
> It tries to go against the rails, but the voltage output 
> range is limited by the internal biasing network anyway.  If 
> you want any sensible output response from an OTA, it must be 
> presented with a suitably low impedance.

Thanks.  I was actually asking the question because I've been
looking at a slew limiting circuit that Batz Goodfortune drew up
(dated 1996).  Unlike the standard lag circuit, this one is linear.
It works somewhat like a tri-core VCO; it uses an OTA as a
variable constant-current supply to charge a cap.  The Iabc
is arranged to limit the output current and hence set an upper
bound on the rate at which the voltage across the cap can rise.

It occurred to me that I could produce more "interesting" results
by switching in larger or smaller caps.  But too small a cap will
in some cases result in the cap rising to the max voltage that
the OTA is capable of driving it to, depending on the input.
Can this damage the OTA?