Zero pole doublet in Gain boosted amplifier

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leozuo

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It is well known there is a doublet existing in Gain boosted amplifier (Fig.1). According to the original paper, "A fast settling CMOS op amp for SC circuits with 90-dB DC gain". The zero is located near the unity gain frequency of addition amplifier, which is not hard to understand. However, where is the pole in the doublet located?
 

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