OPA196: Unity gain stable

The OPA196/7 are unity-gain stable. Decompensated opamps (like the OPA228) are marked as such in the datasheet and in the search function (it's a checkbox in "Features"), and specify the minimum closed-loop gain in the electrical characteristics.

TTD,

OPA196 and OPA197 are unity-gain stable but when driving directly (with no Riso resistor) their capacitive load is limited.  Thus, for example, OPA197 graph shows that driving 300pF load the small-signal overshoot is 25% (the maximum recommended to assure stability over process variation) - see below.

Thus, for example, you cannot drive directly 1uF load - see below.

However, adding just 5 ohm Riso resistor makes the circuit stable - see below.

The above solution works well if there is no resistive load, which otherwise would cause a gain error - see below.

Thus, to solve the gain error problem the solution is to use dual-feedback compensation as shown below.

To confirm stable operation you may also run AC stability simulation showing 83 degrees phase margin whereas the  minimum recommended is 45 degrees - see below.

Please review circuit stability training material under following link: 

https://training.ti.com/ti-precision-labs-op-amps-stability-introduction?context=1139747-1139745-14685-1138805-13848

Below I have attached Tina-TI schematics for your own simulations.

OPA197 Transient stability.TSCOPA197 AC stability.TSC

Good luck!