Discussion
Adding \( R_{S} = 470 \ \Omega \) unbypassed to that stage gives a gain of about
Answer: A
The degeneration factor uses the transconductance and the source resistance:
\[ \begin{aligned} A_{v} &= -\frac{0.003 \times 4700}{1 + 0.003 \times 470} \\ &\approx -5.8 \end{aligned} \]
so about -5.8. The factor of one plus 1.41 is modest because the transconductance is small; the same resistor in a bipolar stage at the same current would reduce the gain far more. How much feedback a given resistor applies depends entirely on the device's transconductance.
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