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Threshold voltage dependence on Vdb

 
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Jan3-13, 05:26 AM   #1
 

Threshold voltage dependence on Vdb


Why does the Vth of MOSFETs depends on Vsb and not Vdb even though MOSFETs are symmetrical devices? Is it a convention to choose Vsb over Vdb or am I missing out on something more fundamental?
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Jan17-13, 08:53 AM   #2
 
Because the source is usually kept at the constant. Also after pinch-off the drain is separated from channel charge by a depletion layer.
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