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Vintage threads from the first ten years
| previous: hys chip mosfet clippers ? -- 12/16/1999 9:48 PM |  |
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Mosfet Splatting
 12/19/1999 2:31 PM |
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AMZ | Mosfet Splatting The integral reverse diode (anode=source) is the soft knee diode (I'll call the other one the normal diode). The reverse diode has a low Vf, much lower than the normal diode. As long as the gate is floating or connected to the source, the reverse diode is the one that can conduct. Diode clippers are almost always used in pairs, and as long as the opposing diode in the clipper pair has a lower Vf than the normal mosfet channel, the opposing diode will conduct and offer a low Z path for the signal before the splatty mosfet junction can conduct. The only way this will not happen is if the Vf of the opposing diode is higher than the Vf of the normal mosfet diode - and it's not for a Ge (or even 3 in series), Si or the reverse mosfet. What this boils down to is that as long as the gate of the mosfet is not connected to its drain, it is very unlikely that the normal mosfet diode will conduct and make a splatty sound. best regards, Jack |
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| Replies: |
| Ed Rembold Jack, Aron Jack, John Greene q{What this boils down to is that a... -- 12/21/1999 4:35 PM |