What the voltage gains in the fet amplifier, Electrical Engineering

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Q. What the voltage gains in the FET amplifier?

For common source

 Voltage gain=Vo/Vi = - µRd / Rd + rd

where µ is the amplification factor,Rd the drain resistance and rd the resistance series to the drain gate of FET.

For common drain

 Voltage gain = µRsVgd/(µ+1)Rs + rd

where µ is the amplification factor,Rs the source resistance, Vgd the input voltage and rd the resistance in series to the drain.


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