Threshold voltage dependence on Vdb


by opcode0x90
Tags: dependence, threshold, voltage
opcode0x90
opcode0x90 is offline
#1
Jan3-13, 05:26 AM
P: 1
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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Kholdstare
Kholdstare is offline
#2
Jan17-13, 08:53 AM
P: 390
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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