1.

Which of the following equations gives the relation between ID and Vgs?(a) ID=IDSS (1-Vgs/Vp)^2(b) ID=IDSS (1-Vgs/Vp)^1(c) ID=IDSS (1-Vgs/Vp)^3(d) ID=IDSS (1-Vgs/Vp)^4This question was addressed to me in exam.My question is taken from Biasing the FET in chapter Field-Effect Transistors of Electronic Devices & Circuits

Answer»

Right option is (a) ID=IDSS (1-Vgs/Vp)^2

For explanation: The above equation called as Shockley’s equation depicts the relation between ID and Vgs. When Vgs BECOMES equal toVp, the CURRENT will become ZERO, which clearly SATISFIES the physical nature of FET.



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