Stability measurement

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Esakki raja

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How to measure the stability for the op amps?
 

Esakki raja said:
How to measure the stability for the op amps?
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I suppose, you are referring to the dynamic stability properties determined by negative feedback, correct?
Measurement is rather simple: Apply feedback as desired and verify if the output is fixed at a certain (desired) dc voltage without any oscillation.
 

A quick time-domain check is to input a low voltage square-wave signal to the closed-loop circuit. The amount of overshoot/ringing on the rising and falling edges is a measure of the stability. A properly stabilized circuit will have little or no overshoot/ringing.
 

Make your opamp as a closed loop by connecting a probe which connects the output and input(in1 or in2 based on your circuit). Then run the stability analysis by considering the probe as a stability finder. Check stability summary if phase margin is 60 to 90deg means your circuit has good stability which avoid osscilation and less ringingggggggg
 

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