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help~about the pole/zero in my amplifier design

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eric.liu

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hi all
I have a question about the pole and zero in my amplifier using Ahuja compensation. An high output impedence occurs at node A(B), so there may a LHP close to the dominant pole. But, pz simulation results show that there also exists a LHZ at node A(B), the same position as the pole (I change the value of C1 and C2, and find the pole and zero change simultaneously). So, this pole-zero doublet has no influence on stability of the amplifier. My question is how this zero generates? thanks![/youtube]
 

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