TQFP
Junior Member level 3

Is there a somewhat simple way to determine if an opamp load is capacitive? How do you know, exactly? I am trying to use an opamp as a simple unity gain source follower, but all the datasheets have huge sections on special requirements for capacitive loads.
I can not control the load of the opamp, it is a pre-existing circuit, and not all of them are the same. They are all common in that there is a load resistor of 390-ohm to 590-ohm (varies), plus various capacitors and / or inductors used to develop the signal and couple it to another transistor stage. The signal is composite video, if it makes any difference.
Since all the circuits have at least the 1 resistor (tied to ground), are the capacitors and inductors (which I assume are making a filter) part of the load?
Thanks,
Matthew
I can not control the load of the opamp, it is a pre-existing circuit, and not all of them are the same. They are all common in that there is a load resistor of 390-ohm to 590-ohm (varies), plus various capacitors and / or inductors used to develop the signal and couple it to another transistor stage. The signal is composite video, if it makes any difference.
Since all the circuits have at least the 1 resistor (tied to ground), are the capacitors and inductors (which I assume are making a filter) part of the load?
Thanks,
Matthew