very low-leakage capacitor
Winfield Hill
based on a low-leakage capacitance which they charge
to the reference voltage (5.000V to 0.01%) and buffer
with an opamp for external use. It's their X60008-50,
http://www.xicor.com/folders/X60008DIS8-50.php
The technology is explaind here,
http://www.xicor.com/pdf_files/x60008_Article.pdf
Their typical drift spec is 10ppm/1000 hours (at 25C),
which is about 0.01% per year, or 50nV per second for
the reference charged to 5V. If the capacitance is
20pF, that's a leakage current of 1aA and an insulation
resistance of 5 x 10^18, or 5E-ohms.
The exa isn't a unit we run into very often. :>)
Thanks,
- Win
George R. Gonzalez
This sounds like an April Fool's joke!
Astounding!
Winfield Hill
>
> Xicor has introduced a precision voltage reference IC
> based on a low-leakage capacitance which they charge
> to the reference voltage (5.000V to 0.01%) and buffer
> Their typical drift spec is 10ppm/1000 hours (at 25C),
Be careful, the drift is 10ppm/1000 hours - that's NOT
per sqrt(1000 hrs)! Sadly, they don't give a maximum
drift spec, nor any info on drift at temperatures above
25C. It looks like the 0.01% initial accuracy could
disappear pretty fast, perhaps even while the part is
sitting in inventory. Use 'em while they're fresh!
Thanks,
- Win
Spehro Pefhany
<wh...@picovolt.com> wrote:
I wonder what radiation or those electron beam devices the USPS was
talking of using to sterilize their anthrax-laden letters will do to
those precious few picocoulombs of charge.
Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
sp...@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
George R. Gonzalez
"George R. Gonzalez" <g...@umn.edu> wrote in message
news:biiluv$fg6$1...@lenny.tc.umn.edu...
>
> This sounds like an April Fool's joke!
>
> Astounding!
... But what happens if the isolated cell gets hit with a cosmic ray?
( and how likely is this...? )
Sir Charles W. Shults III
"cosmic ray meters".
Now awaiting somebody who will voluntarily write the PIC code for it. LOL
Cheers!
Chip Shults
My robotics, space and CGI web page - http://home.cfl.rr.com/aichip
Andrew Paule
Fowler Nordheim tunneling device for the reference
Andrew
Robert Baer
Hopefully i will be getting 5 of them to test at 125C and 175C.
John Larkin
wrote:
Sounds like a good integrated-dose radiation detector, sort of like
the old quartz-fiber dosimeters.
John
John Jardine
Winfield Hill <wh...@picovolt.com> wrote in message
news:biiie...@drn.newsguy.com...
It'd be greatly more useful if they supplied a "recharge enable" pin
allowing any level to be set.
regards
jhon
John Jardine
John Jardine <jo...@jjdesigns.fsnet.co.uk> wrote in message
news:biliml$32l$1...@newsg1.svr.pol.co.uk...
I'm seeing -14pV per sec and 2.8^-22 Amps. What's the name for the one
that's two wodges below the atto?.
Spehro Pefhany
<jo...@jjdesigns.fsnet.co.uk> wrote:
>I'm seeing -14pV per sec and 2.8^-22 Amps. What's the name for the one
>that's two wodges below the atto?.
yocto- 1000^-8
zepto- 1000^-7
atto- 1000^-6
femto- f 1000^-5
Winfield Hill
>
> I'm seeing -14pV per sec and 2.8^-22 Amps. What's the
> name for the one that's two wodges below the atto?.
Warm it up a bit.
Thanks,
- Win
John Larkin
wrote:
>On Thu, 28 Aug 2003 20:18:38 +0100, the renowned "John Jardine"
><jo...@jjdesigns.fsnet.co.uk> wrote:
>
>>I'm seeing -14pV per sec and 2.8^-22 Amps. What's the name for the one
>>that's two wodges below the atto?.
>
> yocto- 1000^-8
> zepto- 1000^-7
> atto- 1000^-6
> femto- f 1000^-5
>
>Best regards,
>Spehro Pefhany
Groucho - $100/2
John
dmi...@spamblock.demon.co.uk
> Then we sell boxes that charge and read arrays of these things and
> call them "cosmic ray meters".
> Now awaiting somebody who will voluntarily write the PIC code for it.
You think you jest, but I can actually see applications for small solid
state imaging detectors with good energy resolution for high energy
gamma (or neutrons, or....).
I do not think the bandgap of silicon is a good match for Mev photons
however.
Imaging detectors exist but they tend to be big, bulky & some requre
cryogenic cooling.
Regards, Dan.
--
** The email address *IS* valid, do NOT remove the spamblock
And on the evening of the first day the lord said...........
.... LX 1, GO!; and there was light.
John Jardine
Spehro Pefhany <sp...@interlog.com> wrote in message
news:taoskv8tn1995pfmj...@4ax.com...
Yocto!. Looks like I've dreamed up a fractional elementary charge :-)
Cheers!.
regards
john
Robert Baer
There a number of un-documented "Do Not Use" pins on the part....
Robert Baer
In some area it might be more useful to count (and watch?) electrons
go by....
Winfield Hill
>
>John Jardine wrote:
>>
>> I'm seeing -14pV per sec and 2.8^-22 Amps. What's the name
>> for the one that's two wodges below the atto?.
>
> In some area it might be more useful to count (and watch?)
> electrons go by....
Indeed. Good luck.
Thanks,
- Win
John Larkin
<rober...@earthlink.net> wrote:
>
> In some area it might be more useful to count (and watch?) electrons
>go by....
I've wondered if some very low-leakage (cooled jfet?) amp could
resolve the single-electron steps associated with leakage. I suspect
1/f noise would win.
John
Roy McCammon
Winfield, one of the low cost Japanese digital watch makers
(Epson maybe) has been using a similar technique for
trimming the watch oscillators. I first read about this over
15 years ago.
--
local optimization seldom leads to global optimization
my e-mail address is: rb <my last name> AT ieee DOT org
John Jardine
Robert Baer <rober...@earthlink.net> wrote in message
news:3F4E4FCC...@earthlink.net...
The "B" version of the device will identify the "Vpgm" and "Vin" pins and be
double the price :-)
regards
john
John Jardine
Squinting at a DVM looking for a -100pV step as an electron falls off the
table every ten minutes, sounds to me like an exquisite torture of the
highest order:-).
regards
john
Robert Baer
I suppose you heard of the infamous Millikan oil drop
experiment.......
Winfield Hill
>
> Winfield Hill wrote:
>>
>> Robert Baer wrote...
>>>
>>> John Jardine wrote:
>>>>
>>>> I'm seeing -14pV per sec and 2.8^-22 Amps. What's the name
>>>> for the one that's two wodges below the atto?.
>>>
>>> In some area it might be more useful to count (and watch?)
>>> electrons go by....
>>
>> Indeed. Good luck.
>
> experiment.......
Yes, of course. In my sophomore year of physics I spent several
months carefully replicating it with "modern" digital equipment.
It was an amazing experiment with spectacular capability, able to
measure a single electron with reasonable resolution. But that
doesn't mean we can do the same thing using q = CV with Xicor's
voltage reference. They'll be using a high capacitance to obtain
low noise and good long-term stability. If their capacitance is
say 20pF, adding or removing one electron changes the DC voltage
by 8nV, far below the noise and drift of their output amplifier.
Thanks,
- Win
Tom Bruhns
is a time constant somewhat over 50 years, or around 5e5 hours. The
10ppm/1000hrs suggests about 1e8 hours time constant, or 3.6e11
seconds, or 11000 years. At 2e-11F, that's about 7.2e22 ohms, no?
(Sorry if someone else already pointed this out...don't have time to
read everything these days!) Pure silcon dioxide (presumably) is a
very good insulator.
Cheers,
Tom
Winfield Hill <wh...@picovolt.com> wrote in message news:<biiie...@drn.newsguy.com>...