Derivation for Vin for my differential pair amplifer

Thread Starter

KaiL

Joined Aug 30, 2014
69
upload_2016-10-11_21-20-39.png
I am trying to find Vin
Is my derivation correct for Vin?
Vin = Vg1
--> Vg1 = Vs1 - Vsg1 = Vs1 - (Vthp + Vod)
--> Vs1 = vd5
 

anhnha

Joined Apr 19, 2012
905
From the picture, Vin is the voltage between two inputs of the differential pair. However, what you wrote is the voltage at the gate of M1 in reference to ground.
What is the purpose in doing this? Are you calculating input common mode range?
 
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