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Inductor deviation of Buck converter

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gn7623233

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??.JPG
Hello everyone.
As the picture shows.
It's a bode plot of the compensated loop gain of Buck converter.
I have a question about why the inductor value become larger would reduce the phase margin?:???:
Thanks for the reply.
Image source:http://ieeexplore.ieee.org/document/6818750/
 

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