I can do DC analysis and draw the small signal equivalent circuit just fine. I generally have trouble calculating gain. I'm having trouble understanding the answer to this question.
This is the question. Question 4.36:
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This is my working. I hope it is clear:
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According to the solution manual this is the wrong answer. The correct answer is `Av = Vo / Vo + 1`:
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I don't understand. Vi is in parallel with Vsg therefore it Vi must equal Vsg right? Where did I make a mistake?