|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?
|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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