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An OPAMP with input offset voltage

fgda
in Homework Help

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1. The problem statement, all variables and given/known data
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2. Relevant equations
Superposition
Non-inverting OPAMP: V_out = (1 + R/R)V_in = 2*V_in2
Inverting OPAMP: V_out = -V_in
V_os = 2.5mV
3. The attempt at a solution
1. V_in enabled, V_os disabled
V_out1 = -V_in
2. V_os enabled, V_in disabled
To get V_out2, use the non inv. equation where V_in2 is equal to V_1 + V_os
where V_1 is the node between R and R at the middle bottom of the circuit.
V_out2 = 2*(V_1 + V_os)
3. V_out = V_out1 + V_out2
Is this the correct approach?
Thanks in advance :)


I'm pretty sure that step 2 is correct. The professor did an example in class that was similar enough to that case. But in step 1, I have input voltage at both OPAMP terminals so I do not know what to do. I'd rather take the OPAMP as a black box with a characteristic equation if possible.

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