A 2N5457 has IDSS = 5 mA and gm0 = 5000 μS. What is the value of VGS(off)? What does gm equal when VGS = -1 V?

Question

A 2N5457 has [latex]I_{DSS}[/latex] = 5 mA and [latex]g_{m0}[/latex]= 5000[latex] \mu[/latex] S. What is the value of [latex]V_{GS(off)}[/latex]? What does gm equal when [latex]V_{GS}[/latex]= -1 V?

Accepted Answer

With Formula (32-10),[latex]V_{GS(off)}=\frac{-2I_{DSS}}{g_{m0}} [/latex]

[latex]V_{GS(off)}=\frac{-2(5 mA)}{5000 \mu S} =-2 V[/latex]

Next, use Formula (32-11) [latex]g_m=g_{m0}(1-\frac{V_{GS}}{V_{GS(off)}})[/latex]to get

[latex]g_m = (5000 \mu S)(1-\frac{1V}{2V})=2500\mu S [/latex]

Question 32.1: A 2N5457 has IDSS = 5 mA and gm0 = 5000 μS. What is the valu...

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