bharat wrote on May 12^th, 2009, 1:34pm:


At first, one general remark: When you ask for interpretation of a gain/phase plot you always have to tell us WHAT the CONTENTS of the plot is.
In this case, it seems to be the loop gain of a system with feedback.
The peak of the gain in the high frequency region and the phase jump at this frequency indicate INSTABILITY of the loop gain.

Thanks buddy and raja.

Buddy,
I agree, this is Gain and Phase plot of feedback system. The reply I was expecting to infer the phase and gain plot in a way that;
the first pole occurs at few hundreds of KHz. Once it crosses the 0dB X axis, it sees 3 zeros at almost neighboring frequency.
1st zero will make -20dB slope to straight line, 2nd zero will make it +20dB and third zero as +40dB because there is sharp inflexion in the plot. This is occuring at few hundreds of MHz.
After these zeros, again a pole has occured at around 1GHz freq.
Is this correct inference.
Though I am not quite sure on seeing the phase response.

Thanks