about integrtor circuit

[fengluan]

for a circuit like that :


how to know it's stability.
if the op is a basic two stage diff op ,how to compensat it.

 

[caosl]

To look into the stability,you can make a simple feedback such as unity gain circuit using you opamp, then disconnect the feedback with large inductor, add the ac source at the disconnected node, investigat the output, calculate the phase noise, >60 is better

 

[fengluan]

hello, if the phase marge of unity-gain op PH>60, whether that mean the loop is stability? the feedback contribute a zero=0 and a pole=60khz.