If a certain drain JFET has a transconductance of 4ms. And has external drain resistance of 1.5 ohm than ideal voltage gain will be _________(a) 4(b) 5(c) 6(d) 8This question was addressed to me in a national level competition.Query is from A Generalized FET Amplifier topic in chapter Field-Effect Transistors of Electronic Devices & Circuits

If a certain drain JFET has a transconductance of 4ms. And has externa

1.	If a certain drain JFET has a transconductance of 4ms. And has external drain resistance of 1.5 ohm than ideal voltage gain will be _________(a) 4(b) 5(c) 6(d) 8This question was addressed to me in a national level competition.Query is from A Generalized FET Amplifier topic in chapter Field-Effect Transistors of Electronic Devices & Circuits
Answer» Right answer is (c) 6 To explain I WOULD SAY: The transconductance, gm is DEFINED as gm = ΔID / ΔVGS so gm = Voltage gain / RD THEREFORE, voltage gain = gm * RD =4 * 1.5 =6.

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