Electronics - Field Effect Transistors (FET) - Discussion
Discussion Forum : Field Effect Transistors (FET) - General Questions (Q.No. 6)
6.
When testing an n-channel D-MOSFET, resistance G to D = 
, resistance G to S = , resistance D to SS = and 500 
, depending on the polarity of the ohmmeter, and resistance D to S = 500 . What is wrong?
, resistance G to S = , resistance D to SS = and 500 , depending on the polarity of the ohmmeter, and resistance D to S = 500 . What is wrong?Discussion:
8 comments Page 1 of 1.
Hegde said:
1 decade ago
Drain and source are not shorted, there is a current source (500 ohm) between source and drain.
Preeti said:
1 decade ago
Please tell me about that briefly.
Abhi said:
9 years ago
Can anyone explain briefly?
Kamlesh said:
9 years ago
Please explain the solution.
Roxy said:
4 years ago
Drain to Source should have a lower value of resistance in order for current to flow through it.
SAYAN SAHA said:
3 years ago
What is D to SS. Is it a source? Please explain.
Anonymous said:
3 years ago
I think SS is Substrate.
(1)
Herach said:
3 years ago
Since it is a D-MOSFET, the device is somewhat "Normally ON" since the thing we're doing with it is depleting the channel which somewhat turns it "OFF".
G to S and G to D must be infinite due to the dielectric separating them.
Drain to SS (or substrate) must be infinite or medium resistance in opposite direction due since the Drain and SS are always opposite in polarity (material composition).
D to S is also medium resistance since it is both same material composition and the main contributing factor in its resistance are the sheet resistance, width and length of the channel.
Therefore all the parameters are close to correct and therefore nothing is wrong.
G to S and G to D must be infinite due to the dielectric separating them.
Drain to SS (or substrate) must be infinite or medium resistance in opposite direction due since the Drain and SS are always opposite in polarity (material composition).
D to S is also medium resistance since it is both same material composition and the main contributing factor in its resistance are the sheet resistance, width and length of the channel.
Therefore all the parameters are close to correct and therefore nothing is wrong.
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