Timeline for What is the following MOSFET circuit good for?
Current License: CC BY-SA 3.0
4 events
| when toggle format | what | by | license | comment | |
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| Jan 21, 2014 at 19:17 | comment | added | Phil Frost | @Zet If your friend did not ask for the threshold voltage of the MOSFET, he could not possibly be right. Unlike BJTs, where the 0.65V is determined by the nature of all silicon PN junctions, it's possible to construct MOSFETs with a wide range of threshold voltages. However, 3V is probably more common than 9V, though either is possible. Even within specimens of the same model, there may be significant variance. For example, 2N7000 lists 0.8V (min), 2.1V (typ), 3V (max). | |
| Jan 21, 2014 at 19:13 | vote | accept | stathisk | ||
| Jan 21, 2014 at 19:12 | comment | added | stathisk | Ok, I got the logic behind the circuit (it helped to study again how the MOSFET functions internally). Also, since \$V_{out} \approx V_{th}\$ (I assume that \$V_{GS(th) \equiv V_{T}=2V}\$) isn't 3.03V a more physically compatible value than 9V ? | |
| Jan 21, 2014 at 17:17 | history | answered | Phil Frost | CC BY-SA 3.0 |