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How is the transconductance at saturation related to the pinch off voltage of the JFET?

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How is the transconductance at saturation related to the pinch off voltage of the JFET?

(a) Inversely proportional

(b) Directly proportional

(c) Inverse-squarely related

(d) Directly and proportional to square of the pinch-off voltage

I have been asked this question in an international level competition.

Question is from Characteristics of JFET topic in portion FET Amplifiers of Analog Circuits

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Correct answer is (a) Inversely proportional

For explanation: The transconductance is seen to be inversely related to the pinch of voltage. The transconductance is seen to be inversely related to the channel length while the pinch off voltage is directly proportional to the channel length.

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