Super Simple VTO-tester

109

01:19:31

This is the simplest VGS(th)(VTO)-tester.
VTO of right side NMOS-FET is measured  by left side NMOS-FET circuit  which works as relay switch.
for example)
VTO of  tested FET=1V
RL=0.1kohm(Id=~100mA) VTO=1.77V
RL=1kohm(Id=~10mA) VTO=1.25V
RL=10kohm(Id=~1mA) VTO=1.08V
RL=100kohm(Id=~0.1mA) VTO=1.03V
RL=1Mohm(Id=~0.01mA) VTO=1.01V
VTO of FET depends on Id.

published 9 years ago

hurz

9 years ago

Nice, and how about measuring Cgs Cdg? ;-) http://everycircuit.com/circuit/5107432901050368

thebugger

9 years ago

To measure the capacitance...i don't know... You probably must make some sort of a tuned circuit and measure the oscillation frequency, and by knowing L you can calculate Cx.

hurz

9 years ago

@thebugger, You don't know and WHAT?

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