Consider the following circuit. IDSS = 2mA, VDD = 30V. Find R, given that VP = – 2V.(a) 10kΩ(b) 4kΩ(c) 2kΩ(d) 5kΩThis question was addressed to me in an interview for job.My question is taken from Biasing of JFET and MOSFET in section FET Amplifiers of Analog Circuits

Consider the following circuit. IDSS = 2mA, VDD = 30V. Find R, given t

1.	Consider the following circuit. IDSS = 2mA, VDD = 30V. Find R, given that VP = – 2V.(a) 10kΩ(b) 4kΩ(c) 2kΩ(d) 5kΩThis question was addressed to me in an interview for job.My question is taken from Biasing of JFET and MOSFET in section FET Amplifiers of Analog Circuits
Answer» CORRECT choice is (B) 4kΩ Easy EXPLANATION: IDSS = 2mA IDS = (VDD – 15)/50k = 0.3mA VGS = VP[1 – \(\sqrt{\frac{I_{DS}}{D_{SS}}}\)] VGS = -2 x (1 – \(\sqrt{.15}\)) = – 1.22V Thus, VGS + IDS x (R) = 0 R = 1.22/0.3mA = 4kΩ.

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