OPA192: Inverting amplifier loop stability simulation of OPA192

Li,

Below is an image of the test circuit for stability.  I added a switch and capacitor to your circuit to show the impact of a 200pF capacitive load.  The theory behind this test circuit and the method to use it is covered in:  Operational Amplifier Stability Theory and Compensation Methods .  In most cases an op amp without a capacitive load or capacitance on the inverting node will not have stability issues.  For the graphs shown below the goal is to have a 45 deg or higher phase margin.  Both the circuit with the capacitive load and the circuit without look very stable.

opa192 inverting amplifier-stability.TSC

Best regards, Art