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Consider the following circuit. Given that VDD = 15V, VP = 2V, and IDS = 3mA, to bias the circuit properly, select the proper statement.

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Consider the following circuit. Given that VDD = 15V, VP = 2V, and IDS = 3mA, to bias the circuit properly, select the proper statement.

(a) RD < 6kΩ

(b) RD > 6kΩ

(c) RD > 4kΩ

(d) RD < 4kΩ

The question was posed to me in final exam.

This intriguing question originated from Biasing of JFET and MOSFET topic in division FET Amplifiers of Analog Circuits

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The correct option is (a) RD < 6kΩ

Easiest explanation: In given circuit, VGS = -5V

VDS = VDD – IDSRD

To bias properly VDS > |VP| – |VGS|

VDS > -3

15 – 3mA*RD > -3

-3mA*RD > -18

RD < 6kΩ.

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