Difference Amplifier

Monday, 10 September 2018

1:41 PM

Amplify the difference between two input signals

Machine generated alternative text:
KCL at node a:
KCL at node b:
Ideal Op Amp with negative
feedback makes va = 12b.
Substitute Eq. Il into Eq I:
—+1)va
O
or
R2(1 + RI/R2)
0 - RI(I + R3/R4)
11

Machine generated alternative text:
A difference amplifier must reject
a signal common to the two
inputs. This condition exists if:
1

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