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Eqn (6.29) holds true for . |
The drain current first increases linearly with the applied drain-to-source voltage, but then reaches a maximum value. This occurs due to the formation of depletion region between pinch-off point and drain. This behaviour is known as drain saturation which is observed for  as shown in figure below. |
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The saturation current IDSsat is given by eqn (6.210), |
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Fig 6.22: IDS-VDS graph |
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