1.

Which of the following is an expression for gm0?(a) gm0 = IDSS/Vp(b) gm0 = 2IDSS/|Vp|(c) gm0 = IDSS/5Vp(d) gm0 = IDSS/2VpI had been asked this question in an interview.I'd like to ask this question from The FET Small-Signal Model in section Field-Effect Transistors of Electronic Devices & Circuits

Answer»

Right answer is (B) gm0 = 2IDSS/|Vp|

The explanation is: gm0is the value of gm when VGS=0, we have SEEN thattrans conductance is the ratio of drain current to changein GATE to source voltage, but this is an EXCEPTIONAL CASE, here the transistor will be working in cut off region.



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