# Differential Amplifier Design Question

Discussion in 'Homework Help' started by jegues, Jan 30, 2011.

1. ### jegues Thread Starter Well-Known Member

Sep 13, 2010
735
43
Hello all,

I've been working on the following question (See figure attached).

I'm on part (ii) and the solution gives this circuit (See other figure attached) as the one that will provide a gain of +2V/V.

I'm tried doing some analysis on the circuit to figure out whether this is right or not but I can't conclude that it indeed gives a gain of 2V/V.

What am I doing wrong?

I've got a feeling my calculation for $V_{+}$ is wrong.

Can someone clarify?

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2. ### Jony130 AAC Fanatic!

Feb 17, 2009
4,019
1,123
In your diagram, V+ = Vin
So the gain is equal Av = 1+ R/R = 2V/V