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PICList Thread
'[EE] Somebody makes zero volt gate MOSFETs'
2011\08\17@202906 by M.L.

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On Wed, Aug 17, 2011 at 5:50 PM, YES NOPE9 <spam_OUTyesTakeThisOuTspamnope9.com> wrote:
> So says Rzzzzzzzzzzzz
> My question is ...   Who makes these transistors ?  Where can you buy them ?
> Where is a TOO ...... theory of operation ?????
> Best
> 99guspuppet

They're called depletion mode devices. A conduction channel exists at
zero gate volts and is depleted by applying a negative gate voltage.
Check any semiconductor reference for a theory of operation.

--
Martin K.

2011\08\17@203805 by Brent Brown

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On Wed, Aug 17, 2011 at 5:50 PM, YES NOPE9 <.....yesKILLspamspam@spam@nope9.com> wrote:
> So says Rzzzzzzzzzzzz
> My question is ...   Who makes these transistors ?  Where can you buy them ?
> Where is a TOO ...... theory of operation ?????
> Best
> 99guspuppet

I remembered there was a PIClist post about this ages ago, the link below is still active...

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-- Brent Brown, Electronic Design Solutions
16 English Street, St Andrews,
Hamilton 3200, New Zealand
Ph: +64 7 849 0069
Fax: +64 7 849 0071
Cell: +64 27 433 4069
eMail:  brent.brownspamKILLspamclear.net.nz

2011\08\17@222344 by YES NOPE9

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Okie Dokie

I found MOSFET arrays at DigiKey.
Produced by Advanced Linear Devices Inc
Priced at $2.50 and up
Lowest Vgs(th) I found was 10mv


99guspuppe

2011\08\17@234751 by RussellMc

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> They're called depletion mode devices. A conduction channel exists at
> zero gate volts and is depleted by applying a negative gate voltage.
> Check any semiconductor reference for a theory of operation.

Depletion mode devices are useful (and fun when one is not accustomed
to them) but these are different again.

Note that the amount of gate charge and thus Vth can be user programmed !!!

ALD say:

These quad/dual N-channel matched-pair MOSFETs are level-matched at
the factory using a floating-gate charge controller ALD calls EPAD,
for electrically programmable analog device. The floating gate is
polysilicon embedded in the gate oxide. The charge level on this gate
controls the sensitivity of the MOSFET switch, and can be set with the
EPAD programming tool.
With CMOS, EPAD programming can set thresholds from 0.01 V to - 0.01 V
with an offset voltage of just 2 mV. Thus, the zero-threshold MOSFET
can be classified as either an enhancement-mode device (when operated
above the threshold voltage) or a depletion-mode device (when operated
at or below threshold voltage).
The quad and dual MOSFET arrays have part numbers ALD110800 and
ALD110900. Their gate threshold voltage is 0.0 V 0.01 V at 1 microamp.
Pricing starts at 91 cents each in quantities of 1,000 pieces.

Datasheet:  http://aldinc.com/pdf/ALD110800.pdf

Dual $3.16/1  http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=1014-1030-ND

I think I posted the original reference (in 2005).


     Russel

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