Problem with the Rail-to-Rail OP

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wang.yuanzhuo

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I'm reading the paper "A Rail-to-Rail Constant-gm Low-Voltage CMOS
Operational Transconductance Amplifier" Ferri, JSSC. I'm puzzled with the explaination of the circuit Fig.2(b), especially the voltage regulating. Could someone give me a clear explaination?

 

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