A problem in studying analog design essentials

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A problem when study analog design essentials

I'm a freshmen in studying the textbook Analog Design Essential written by Willy Sansen .

I find confused when learn the current differential amp in chapter 3.

I dont know why the Rin = 1/(gm1*gm3*ro3) in the circuit which You can see by clicking the link below or see the attachment.


https://obrazki.elektroda.pl/6486900700_1352133591.png
 

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