A common source amplifier is shown in the figure. The input signal is $V_{sig}$ and the DC bias voltage is $V_{bias}$. The output voltage is $V_{out}$ and the drain supply voltage is $V_{DD}$. The resistor is $R$. 1. Draw the small-signal equivalent circuit. 2. Derive an expression for the voltage gain $A_v = \frac{V_{out}}{V_{sig}}$. 3. What is the input impedance $Z_{in}$? 4. What is the output impedance $Z_{out}$?
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In this case, it appears to be a bipolar junction transistor (BJT) since there is a base-emitter junction and a collector-emitter junction. Next, we need to determine the terminals of the BJT. The base terminal is connected to the input signal source, the emitter Show more…
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