Question 7.6: When the VGS of a JFET changes from -3.1 V to -3 V, the drai...
When the V_{GS} of a JFET changes from -3.1 V to -3 V, the drain current changes from 1 mA to 1.3 mA. What would be the value of the tranconductance of the JFET?
Given ΔV_{GS} = 3.1 – 3 = 0.1 V (in magnitude)
ΔI _{D} = 1.3 – 1.0 = 0.3 mA.
Transconductance, g_{m}=\frac{ΔI _{D}}{ ΔV_{GS}}=\frac{0.3 \ mA}{0.1 \ V}
= 3 mA /V
= 3 micro mho.
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