Vin is to the left, before the input coupling cap C1, V out is to the right after C2.Do you have a slightly bigger version of the image?
I'm reading it as the voltage is applied at the output (after the capacitor), is that correct?
Ah I understand, thanks for the explanation!The gm and re of the transistor changes when the transistor's current changes.
When the collector voltage increases because the transistor's current is reducing then the gm is also reducing which reduces the voltage gain.
If the transistor is amplifying a sine-wave then the top portion is compressed and the botton portion is expanded causing severe distortion like this simulation:
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