Differential Amplifier Question?

Can I use a differential amplifier to shift the voltage level of my AC signal? Because its formula is Vout=V2-V1 . I have a negative AC signal input for my op amps negative terminal or V1 is negative. My V2 will have a DC input of 2V.


Also, another guy is telling me that because V2 is connected like a voltage divider so he said Im only shifting it by half of V2. So, I need some clarification.

denki said:

Can I use a differential amplifier to shift the voltage level of my AC signal?

Click to expand...

Yes.

denki said:

another guy is telling me that because V2 is connected like a voltage divider so he said Im only shifting it by half of V2

Click to expand...

That "another guy" is wrong.
It's true the voltage at the amp plus input is 1/2 the positive input voltage, but the gain at the plus input is +2, due to the resistors on the minus input, so the gain from the positive input to output is 1.

Thank you!