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Low cap PMOS

F

Fred Bartoli

I think it was J.L. who gave a few weeks/months ago the reference of a
nice small PMOS with IIRC half the parasitics of a BSS84, but I can't
find it...

John, can you give it again?

Thanks.
 
J

Joerg

Fred said:
John Larkin a écrit :

I think so. Thanks.

One thing I didn't notice is that they seem to have built-in awfully
high gate resistance... (see the loooong switching times)

That's on account of the built-in gate-source zener. You'll want a FET
without that. Slim pickens, as they say over here, not too much to pick
from.

If there is the slightest chance to swing this circuit to N-channel then
by all means I'd do it.
 
M

Mr Stonebeach

I think it was J.L. who gave a few weeks/months ago the reference of a
nice small PMOS with IIRC half the parasitics of a BSS84, but I can't
find it...

John, can you give it again?

Thanks.

I have used FDV302P in some cryogenic work,
it also has pretty low Ciss.

Regards,
Mikko
 
J

Joerg

Joerg said:
That's on account of the built-in gate-source zener. You'll want a FET
without that. Slim pickens, as they say over here, not too much to pick
from.

If there is the slightest chance to swing this circuit to N-channel then
by all means I'd do it.

Ooops, sorry, I read gate capacitance but that's not what you meant.
 
F

Fred Bartoli

Joerg a écrit :
Ooops, sorry, I read gate capacitance but that's not what you meant.

Ah, I wondered what the zener had to do with the gate resistance :)
 
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