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To correct Error in Gain Margin and Phase Margin in MATLAB

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Irfansw07

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I have 3 poles value @ 100Hz , 1MHz and 10MHz and open loop gain
(Ao) = 10000.
When I calculate Gain Margin and Phase Margin through MATLAB than
its showing Infinity but when I compare with textbook answer than Texbook
answer is showing some numerical value rather than Infinity.

Can somebody please explain me why I got different answer from
textbook ?

Thanks in advance
 

LvW

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MATLAB is "showing infinity"? A margin never can be infinite! Something is wrong!
Instead, trust the textbooks in conjunction with your own calculations (BODE diagram)!
 

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