Threshold voltage dependence on Vdb

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opcode0x90
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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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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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