# Output opamp voltage

1. May 8, 2017

### Abdulwahab Hajar

1. The problem statement, all variables and given/known data
In the figure below find V(o) / V(s)

2. Relevant equations
In an opamp current doesn't enter through the inverting and non-inverting terminals, furthermore in DC conditions a capacitor acts like an open circuit

3. The attempt at a solution
The way I see it, both capacitors will act like open circuits current will have no path to follow....
therefore V(o) will be equal to 0V. also, no initial conditions are mentioned....
Is this correct?
or could this be done by a laplace transform??
figure is attached
Thank you

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2. May 8, 2017

### Staff: Mentor

Assume that $v_s(t)$ is an AC source. The gain will depend upon the frequency.

3. May 8, 2017

### Abdulwahab Hajar

Got it, but how can I tell when it's an AC from a DC source

4. May 8, 2017

### Staff: Mentor

Usually they will use a slightly different symbol for the source.

In this case the presence of capacitors in the feedback path is a strong indication that some sort of signal filter is implemented, implying an AC input signal.