Which one of the following expression is correct for transconductance $(g_{m})$ of a JFET?

$g_{m} = \frac{2 I_{D S S}}{| V_{P} |}$

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$g_{m} = \frac{2 I_{D S S}}{| V_{P} |} [\frac{I_{D S}}{I_{D S S}}]$

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$g_{m} = \frac{2 I_{D S S}}{| V_{P} |} [1 - \frac{V_{G S}}{V_{P}}]$

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$g_{m} = \frac{2 I_{D S S}}{| V_{P} |} \sqrt{1 - \frac{V_{G S}}{V_{P}}}$

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Solution

The correct option is C
$g_{m} = \frac{2 I_{D S S}}{| V_{P} |} [1 - \frac{V_{G S}}{V_{P}}]$

(b)
Tranconductance ( $g_{m}$ ) of a JEET is
$g_{m} = g_{m o} [1 - \frac{V_{G S}}{V_{P}}]$
where, $g_{m o} = \frac{2 I_{D S S}}{| V_{P} |}$

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