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Which of the following is an expression for gm0?

Which of the following is an expression for gm0? Correct Answer gm0 = 2IDSS/|Vp|

gm0 is the value of gm when VGS=0, we have seen that trans conductance is the ratio of drain current to change in gate to source voltage, but this is an exceptional case, here the transistor will be working in cut off region.

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