I have this common-emitter BJT amplifier:
The text book says that with a bypass capacitor, the gain is -Rc/re, where Rc is resistor R6 and re is the internal resistance of the BJT. The internal resistance of the BJT is found by computing VE = VB - VBE (VB is found by voltage division, VBE is 0.7V), then IE = VE/RE = VE/R7, then re (internal resistance) = 25mV/Ie
Now I want to simulate this circuit and use simulated values to directly compute the gain by dividing the output by the input voltage, so I can compare with the theory, but I do not know exactly what is the input and what is the output. Are they taken right before and after the BJT, or right before and right after the caps, or...?
I have tried to take different combinations of output/input but the result does not even come close to the theoretical -Rc/re.
Any guidance will be appreciated. Thank you.