Very interesting device, but the Vgs_max is 10V, not 200mV, and the Rds_on
is >100K ohms for Vgs=3D0V, and 500 ohms for Vgs=3D4V. In fact, it looks li=
ke
what they are doing is, first, exploiting the subthreshold operation (which
is not a new technique but it is a bit of a stretch to call it "ON") and
then using a floating gate, as I suggested, to fine tune the Vgs
characteristic to obtain very good matching for multiple FETs in the same
device and tight tolerances in general:

http://www.aldinc.com/ald_epadfaq.php

Sean


On Mon, Nov 23, 2015 at 2:22 AM, embedded systems <piclist9@gmail.com>
wrote:

> Hi Sean,
> I've searched for low Vgs/Vd mosfets for RF (and other kind of)
> harvesting. I found this one:
> http://www.aldinc.com/pdf/ALD110800.pdf
>
> Unfortunately not available in my corner of the world.
> However, around us is a lot of wasted energy. Only if will be able to
> collect just the 50/60Hz hum and our microcontrollers will run for free.
>
> best,
> Vasile
>
> On Sun, Nov 22, 2015 at 10:39 PM, Sean Breheny <shb7@cornell.edu> wrote:
>
> > 0V threshold I can understand (it's either depletion mode or has a
> floating
> > gate inside that biases it toward ON) but what do you mean by 0.2V drai=
n?
> > You mean 200mV maximum Vds in the OFF state? That I have not seen.
> >
> > On Sat, Nov 21, 2015 at 7:06 AM, embedded systems <piclist9@gmail.com>
> > wrote:
> >
> > > There are a lot of mosfets with gate threshold voltage between 2V and
> 4V.
> > > The short answer is yes.
> > >
> > > BTW, there are a few mosfets with 0V threshold voltage and 0.2V drain
> > > voltage.
> > >
> > > Vasile
> > >
> > > <http://mailman.mit.edu/mailman/listinfo/piclist>
> > >
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