Small-signal JFET Amplifier: A JFET amplifier has a transconductance gm of 1.88 mmhos, a drain resistance of 6.8 kohms, and an ac gate voltage of 1 mV. What is the voltage gain and the ac output voltage?

Answer: The voltage gain equals the transconductance times the equivalent parallel resistance of the drain resistance and the load resistance. In this case, no load resistance is connected to the amplifier, so the voltage equals 12.8. The ac output voltage is 12.8 times 1 mV, which is 12.8 mV.

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