\[\text{g}_{\text{m}}=\frac{2 \text{I}_{\text{DSS}}}{\left|\text{V}_{\text{p}}\right|}\left(1-\frac{V_{G S}}{V_{p}}\right)=\frac{2 \text{I}_{\text{DSS}}}{\left|\text{V}_{\text{p}}\right|} \sqrt{\frac{\text{I}_{D}}{\text{I}_{\text{DSS}}}}\]
\[\text{g}_{\text{m}}=\frac{2 \text{I}_{\text{DSS}}}{\left|\text{V}_{\text{p}}\right|}\left(1-\frac{V_{G S}}{V_{p}}\right)=\frac{2 \text{I}_{\text{DSS}}}{\left|\text{V}_{\text{p}}\right|} \sqrt{\frac{\text{I}_{D}}{\text{I}_{\text{DSS}}}}\]