- #1
likephysics
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Homework Statement
Find input resistance of the ckt (see attached)
Homework Equations
The Attempt at a Solution
Q2 is diode connected, so I replaced Q2 with VBE resistance (rbe or r∏).
So, Rin is rbe1+(β+1)rbe2
But the answer is somewhat different, it's rbe1+ (β+1) (rbe2||1/gm2)
Where did 1/gm2 come from?