integrators or followers

[jhaible]

> Looking at designs using OTA integrators, like SVFs and VCOs. I notice
> that some have the cap bolted to the OTA output and ground, and the
> signal is then buffered by a follower of some sort. While some have the
> cap around an op-amp integrator. Any advantage in doing it this way?

There are pro's and con's for both options.
The opamp integrator method keeps the OTA output swing low,
i.e. reduces distortion from the OTA's output nonlinearities.
OTOH typical opamps are not as fast as a discrete transistor follower,
so you get some delay from the opamp.

JH.