Discussion
The voltage of a common source JFET amplifier depends upon its __________.
Answer: A
The voltage gain depends on both transconductance and internal load resistance.
A JFET is controlled by its gate-source voltage, and its transconductance \(g_{m}\) gives the change in drain current per volt of input. That current flows through the drain load, so the output voltage is the current times the load resistance, giving a gain of about \(A_{v} = g_{m} r_{L}\), where \(r_{L}\) is the effective drain load (the drain resistor in parallel with the device's own drain resistance).
Transconductance alone or load resistance alone gives only one factor of the product. The amplification factor is a device constant, the gain with an unlimited load, and does not describe a working stage with a finite load.
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