What is the following circuit role

WBahn

Joined Mar 31, 2012
29,932
Why do you want the product of Y and X as a function of V_in?

It's looks to me like V_in IS the signal X.

Do you know about small signal models?
 

DickCappels

Joined Aug 21, 2008
10,140
(Hint: In this circuit the signal flows from right to left and the base of the transistor connects to both the 39k and the 3.3 k resistors. It is very poorly drawn )
 
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