second order effects

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raghunaandan

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why the channel length shortens as we increase Vds ? what is impact of ionization ?
 

raghunaandan said:
why the channel length shortens as we increase Vds ?
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When you increase vds, the drain to substrate voltage increases which increases the depletion region between the drain and substrate. This forces the pinch-off point to move into the source direction, reducing the channel length.
 

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