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very low-leakage capacitor

Discussion in 'Electronic Design' started by Winfield Hill, Aug 27, 2003.

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  1. 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
    with an opamp for external use. It's their X60008-50,

    The technology is explaind here,

    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. :>)

    - Win
  2. This sounds like an April Fool's joke!

  3. 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

  4. .... But what happens if the isolated cell gets hit with a cosmic ray?
    ( and how likely is this...? )
  5. 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. LOL


    Chip Shults
    My robotics, space and CGI web page -
  6. Guest

    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

    Imaging detectors exist but they tend to be big, bulky & some requre
    cryogenic cooling.

    Regards, Dan.
  7. Andrew Paule

    Andrew Paule Guest

    I wonder what the drift spec has to do with the cap - this thing is a
    Fowler Nordheim tunneling device for the reference

  8. Robert Baer

    Robert Baer Guest

    Hopefully i will be getting 5 of them to test at 125C and 175C.
  9. John Larkin

    John Larkin Guest

    Sounds like a good integrated-dose radiation detector, sort of like
    the old quartz-fiber dosimeters.

  10. John Jardine

    John Jardine Guest

    It'd be greatly more useful if they supplied a "recharge enable" pin
    allowing any level to be set.
  11. John Jardine wrote...
    Warm it up a bit.

    - Win
  12. yocto- 1000^-8
    zepto- 1000^-7
    atto- 1000^-6
    femto- f 1000^-5

    Best regards,
    Spehro Pefhany
  13. John Larkin

    John Larkin Guest

    Groucho - $100/2

  14. John Jardine

    John Jardine Guest

    Yocto!. Looks like I've dreamed up a fractional elementary charge :)

  15. Robert Baer

    Robert Baer Guest

    There a number of un-documented "Do Not Use" pins on the part....
  16. Robert Baer

    Robert Baer Guest

    In some area it might be more useful to count (and watch?) electrons
    go by....
  17. Roy McCammon

    Roy McCammon Guest

    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.
  18. John Jardine

    John Jardine Guest

    The "B" version of the device will identify the "Vpgm" and "Vin" pins and be
    double the price :)
  19. John Jardine

    John Jardine Guest

    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:).
  20. Robert Baer

    Robert Baer Guest

    I suppose you heard of the infamous Millikan oil drop
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