Stability of integrator

[GDF]

How to make sure the stability of a OP-based integrator?
Do I need to break the feedback loop to measure the loop gain and phase margin?
Or, just use a step response to check the stability?

 

[alvays]

Maybe the integrator cap can be considered as load of the op. So if the op is made with enough stability margin loaded by the cap, this will be done

 

[Chung-Yuan Chen]

Yes, you need to break the feedback loop to measure the loop gain and phase margin, and don't forget to add the parasitical input capacitor of the amplifier.

 

[xwcwc1234]

To Chung-Yuan Chen,
Hwo to do that for measuring the phase margin & gain using Hspice ?

 

[huojinsi]

The simple method is putting a step pulse signal on the input terminal, do a transient simulating and check output overshoot before reaching steady state.If overshoot is very large ,the integrator isn't stability!