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what is the role of these transistors?

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wjxcom

wjxcom

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Hi, all: look at the circuit please. I do not know what is the role of the M15 and M16. somebody tell me that M15 and M16 can reduce the output resistance, but why?

help me, please!!!
 

you can get the answer from the page 389~391 of gray's book.
 

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