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DISCRETE NMOS & PMOS, Low V, Low I

Discussion in 'Electronic Design' started by Jim Thompson, Jan 11, 2008.

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  1. Jim Thompson

    Jim Thompson Guest

    Not being a discrete MOS user, I am unfamiliar with what is currently
    available.

    I need NMOS and PMOS, VDS <= 5V, ID <=500uA

    (And truly small... need capacitance as low as possible.)

    Operating frequency <= 100KHz

    Suggestions?

    Thanks!

    ...Jim Thompson
     
  2. Winfield

    Winfield Guest

    The smallest VMOS types are the Supertex VN01 and VP01
    and the ubiquitous 2n7000 2n7002 we know and love. But
    these are 500mA-capable parts, with non-trivial die size
    and capacitance. If you want really small size and low
    capacitance, you'll need to go to some of the discrete
    parts we discuss in AoE chapter 3. Or you can go to the
    discrete parts found in the old cd4007 ICs. Many of us
    are sad not to have good small MOSFETs to work with.
     
  3. Phil Hobbs

    Phil Hobbs Guest

    Or open one up and use a focused ion beam to mill off the bits you don't
    want. ;)

    Cheers,

    Phil Hobbs (Gearing up to do that with some of my antenna gizmos--wish
    me luck)
     
  4. JimW52

    JimW52 Guest

    www.google.com same as the rest of us.

    Jim
     
  5. Jim Thompson

    Jim Thompson Guest

    So you have no experience with such small device either?

    You were SO helpful.

    ...Jim Thompson
     
  6. Fred Bloggs

    Fred Bloggs Guest

    There are lots of new JFETs with |Vp|<1V these days, maybe you should
    look into those.
     
  7. Jim Thompson

    Jim Thompson Guest

    I need them to be MOSfets.

    ...Jim Thompson
     
  8. Winfield

    Winfield Guest

    Why, what are you working on?
     
  9. Jim Thompson

    Jim Thompson Guest

    As usual, I can't say.

    Which is terribly unfortunate for my image on this newsgroup :-(

    Everyone defines me strictly by my political views, when I'm probably
    the busiest designer lurking here.

    ...Jim Thompson
     
  10. Winfield

    Winfield Guest

    I forgot to mention ALD's EPAD devices. Some are
    quite small, e.g. the ALD110902, a dual MOSFET with
    Ciss = 2.5pF, which is low for a discrete device.
    http://www.aldinc.com/ Mouser has 'em for $1.80
     
  11. MooseFET

    MooseFET Guest

  12. Winfield

    Winfield Guest

    You can probably safely say something in a general way,
    e.g., a battery-power piezo-sensor amplifier, etc.
    It's your choice to trash other members on this newsgroup
    and regularly insult whole groups of people, just for the
    fun of it - your fun that is. Not funny, not appreciated!
     
  13. Jim Thompson

    Jim Thompson Guest

    Trying to find a _low_ current cascoding method that doesn't introduce
    cross-product distortion, yet has an effective beta --> very large.
    But it's so much fun ;-)

    ...Jim Thompson
     
  14. Jim Thompson

    Jim Thompson Guest

    Thanks! I'll look these up.

    ...Jim Thompson
     
  15. John Larkin

    John Larkin Guest

    CD4007?

    John
     
  16. John Larkin

    John Larkin Guest

    Or these:

    http://www.calogic.net/html/mosfet.html

    John
     
  17. Yes, as Winfield said, fun for you, but deadly for your victims,
    when implemented by Blitzkrieg.

    Personally, I find that most sane people around here can recognize
    an asshole when they see one, pardon my Minnesota Slang.

    And it's not just you - the second member of your mutual
    admiration society seems to be Bill Sloman, followed closely
    by Michael, Keith, At least one of the Johns, and all manner
    of neocon interlopers and troublemakers.

    Sure, you like freedom when _you've_ got it, but Freedom in
    general, like for people outside of the inner party circle,
    well, they don't deserve Freedom, because they (in your
    twisted view of the world) are only ignorant beasts of burden.

    You wouldn't know real Liberty if it jumped up and bit you in
    the ass.

    Thanks,
    Rich
     
  18. Joerg

    Joerg Guest

    Have you asked your favorite foundries? Some will bond out sample
    devices for you, to kick the tires or to lash up something. For really
    good customers they might even be free. Usually they won't offer fancy
    packages such as SC75 but more likely SO-something and you can't be too
    picky about geometry.
     
  19. Guest

    Gee Rich, that's a gratuitious personal insult, at the level Jim
    Thompson aspires to - though his capacity for being rude falls well
    short of deadly.

    I know you don't appreciate being written off as gullible because
    you've been suckered by the "The Global Warming Swindle", but I don't
    go out of my way drag your name into arguments in which you aren't
    involved, and I'd think better of you if you had the sense not to
    exhibit exactly the kind of bad behaviour you are complaining about.

    <snip>
     
  20. JimW52

    JimW52 Guest

    Not fun, merely tiresome. You and your coterie are trolls of the worst
    kind. You are mean and vindictive, but your biggest sin is that you are
    just plain boring.

    Jim
     
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