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Triode region mosfet amplifier
Triode region mosfet amplifier
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Old 3rd August 2002, 10:46 PM   #1
mirlo is offline mirlo  United States
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Default Triode region mosfet amplifier

I wonder what the limitations of this are:

Bias a mosfet with lots of current, so that Vgs is reasonably large. Then squeeze down Vds so that you get it in the triode region, where the device I-V characteristics are more linear.

Maybe it's better to do this with a differential configuration and bias the cascode to the common source point of the FETs.
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Old 5th August 2002, 07:30 PM   #2
Nelson Pass is offline Nelson Pass  United States
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Triode region mosfet amplifier
To get the triode region up to swing +/- 3 volts,
an IRF510 would have to be biased at about 5 amps,
and IRFP240 at 20 amps or so. You would definitely
be at the absolute limits of operation.

Maybe some other type of Mosfet, such as the early
Toshiba power parts might get you there more easily.
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Old 6th August 2002, 02:33 AM   #3
mirlo is offline mirlo  United States
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Default Yow, too much.

Maybe putting several devices in series would help. But would they have to be matched, so that they would split Vds evenly, or would that not matter so much.

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