- #1
FOIWATER
Gold Member
- 434
- 12
In the following diff amp, only one output is taken from collector two.
When I calculate the differential mode gain using the second differential input (-Vid/2) I get a positive gain. When I calculate the differential mode gain using the first differential input (Vid/2) I get a negative gain.
A spice simulation of this circuit shows that the output is positive.
I would then expect to get a negative gain for (-vid/2) and a positve gain for (vid/2)
Does someone know why that is not the case?
When I calculate the differential mode gain using the second differential input (-Vid/2) I get a positive gain. When I calculate the differential mode gain using the first differential input (Vid/2) I get a negative gain.
A spice simulation of this circuit shows that the output is positive.
I would then expect to get a negative gain for (-vid/2) and a positve gain for (vid/2)
Does someone know why that is not the case?