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Difference between overdrive voltage and pinch-off voltage

Mark_

Oct 20, 2015
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overdrive voltage Vov = VGS - VT
pinch-off voltage VDSAT is also VGS - VT
are they the same thing or I am making some mistake on the concept?
Thx in advance
 

Harald Kapp

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Nov 17, 2011
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VGS-VT expresses the voltage difference between gate voltage and threshold voltage.
When VGS-VT is greater than 0V, the gate is driven to more than the required gate voltage to turn on, it is overdriven. See Wikipedia.
Pinch off voltage is the drain voltage where saturation starts, that is where VDS=VGS-VT, see Wikipedia.

The difference is that VOV is measured between gate and source, VDS between drain and source.
 

Mark_

Oct 20, 2015
4
Joined
Oct 20, 2015
Messages
4
VGS-VT expresses the voltage difference between gate voltage and threshold voltage.
When VGS-VT is greater than 0V, the gate is driven to more than the required gate voltage to turn on, it is overdriven. See Wikipedia.
Pinch off voltage is the drain voltage where saturation starts, that is where VDS=VGS-VT, see Wikipedia.

The difference is that VOV is measured between gate and source, VDS between drain and source.
Thanks a lot!
 
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