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Switched-capacitor or switched-current?

Discussion in 'Electronic Design' started by Luo XiaoZen, Nov 9, 2005.

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  1. Luo XiaoZen

    Luo XiaoZen Guest

    Switched-capacitor or switched-current? Which one is better candidate
    to meet the needs of a 500-MHz signal-bandwidth Delta-Sigma Modulator?
    Thx!
     
  2. Boki

    Boki Guest

    How is the OSR, clock speed, power, supply voltage, DSM orders...

    Do you mean 500-MHz is the input signal bandwidth?
     
  3. Luo XiaoZen

    Luo XiaoZen Guest

    OSR = 16, analog power budget < 20 mW, 1.5-V supply -- don't know the
    orders: a MASH DSM it is.

    And yes, 500-MHz is the maximum input signal bandwidth.

    Any pointers???
     
  4. Boki

    Boki Guest

    Did you have the high bandwidth OP already ? 500MHz input signal is not a
    low frequency.

    By 1.5V supply, how is your process, are you going to use switched-opamp?

    MASH 1-1-1 ?
     
  5. Luo XiaoZen

    Luo XiaoZen Guest

    We've designed the wideband op-amp already.

    Switched-Op-amp is too slow...

    MASH 2-1-1.
     
  6. Boki

    Boki Guest

    Can you introduce more, sounds interesting.
     
  7. Luo XiaoZen

    Luo XiaoZen Guest

    Sorry, I can't. Company policy ;-)

    Someone in my team decided that switched-capacitor is doable and that
    is the final answer. Thx!
     
  8. Jim Thompson

    Jim Thompson Guest

    That's dumb ;-)

    ...Jim Thompson
     
  9. Luo XiaoZen

    Luo XiaoZen Guest

    May I ask why?
     
  10. Jim Thompson

    Jim Thompson Guest

    Might help if you quoted the prior post, so we have a clue what you
    are asking.

    Is this a homework problem?

    ...Jim Thompson
     
  11. JeffM

    JeffM Guest

  12. Luo XiaoZen

    Luo XiaoZen Guest

    No, it isn't.

    And have you retired?
     
  13. Luo XiaoZen

    Luo XiaoZen Guest

  14. Nobody knows. As far as _I_ know, he's still designing obscure arcane
    multifunction chips for some multi-billion-dollar company, and pulling
    down a very, very comfortable salary. In fact, he brags about it from
    time to time.

    He occasionally also brags about other aspects of His Good Fortune,
    which, of course, since I'm a leper, bothers me no end.

    But, life goes on, long after the thrill is gone.

    Speaking of that, today's "fortune" was:
    -----
    Life is a game. In order to have a game, something has to be more
    important than something else. If what already is, is more important
    than what isn't, the game is over. So, life is a game in which what
    isn't, is more important than what is. Let the good times roll.
    -- Werner Erhard
    -----
    Well, I disagree with his fundamental assumptions here, but that's a
    whole nother topic. But, just to quote it, I looked it up in my
    "fortunes2" file (actually, found it in fortunes2 by grep Erhard *), and
    was amazed at the philosophy I found contained in that text file, so here
    is an excerpt, from Slackware's /usr/share/games/fortunes/fortune2 , about
    "Life": (BTW, it's GPL, so there's no copyright infringement that I know
    of.)

    I'm gonna sign off here - it's kinda long. As usual, please post your
    feedback intelligently and blobbedy blah blah yadda. %-}

    Thanks!
    Rich
    -----
    %
    LIFE:
    A whim of several billion cells to be you for a while.
    %
    LIFE:
    Learning about people the hard way -- by being one.
    %
    LIFE:
    That brief interlude between nothingness and eternity.
    %
    Life -- Love It or Leave It.
    %
    Life begins at the centerfold and expands outward.
    -- Miss November, 1966
    %
    Life being what it is, one dreams of revenge.
    -- Paul Gauguin
    %
    Life can be so tragic -- you're here today and here tomorrow.
    %
    Life does not begin at the moment of conception or the moment of birth.
    It begins when the kids leave home and the dog dies.
    %
    Life exists for no known purpose.
    %
    Life in this society being, at best, an utter bore and no aspect of society
    being at all relevant to women, there remains to civic-minded responsible
    thrill-seeking females only to overthrow the government, eliminate the money
    system, institute complete automation and destroy the male sex.
    -- Valerie Solanas
    %
    Life is a biochemical reaction to the stimulus of the surrounding
    environment in a stable ecosphere, while a bowl of cherries is a
    round container filled with little red fruits on sticks.
    %
    Life is a concentration camp. You're stuck here and there's no way
    out and you can only rage impotently against your persecutors.
    -- Woody Allen
    %
    Life is a gamble at terrible odds, if it was a bet you wouldn't take it.
    -- Tom Stoppard, "Rosencrantz and Guildenstern are Dead"
    %
    Life is a game. In order to have a game, something has to be more
    important than something else. If what already is, is more important
    than what isn't, the game is over. So, life is a game in which what
    isn't, is more important than what is. Let the good times roll.
    -- Werner Erhard
    %
    Life is a game of bridge -- and you've just been finessed.
    %
    Life is a glorious cycle of song,
    A medley of extemporania;
    And love is thing that can never go wrong;
    And I am Marie of Roumania.
    -- Dorothy Parker, "Comment"
    %
    Life is a grand adventure -- or it is nothing.
    -- Helen Keller
    %
    Life is a healthy respect for mother nature laced with greed.
    %
    Life is a hospital in which every patient is possessed by the desire to
    change his bed.
    -- Charles Baudelaire
    %
    Life is a series of rude awakenings.
    -- R.V. Winkle
    %
    Life is a serious burden, which no thinking,
    humane person would wantonly inflict on someone else.
    -- Clarence Darrow
    %
    Life is a sexually transferred disease with 100% mortality.
    %
    Life is a yo-yo, and mankind ties knots in the string.
    %
    Life is an exciting business, and most
    exciting when it is lived for others.
    %
    Life is both difficult and time consuming.
    %
    Life is cheap, but the accessories can kill you.
    %
    Life is difficult because it is non-linear.
    %
    Life is divided into the horrible and the miserable.
    -- Woody Allen, "Annie Hall"
    %
    Life is fraught with opportunities to keep your mouth shut.
    %
    Life is just a bowl of cherries, but why do I always get the pits?
    %
    Life is knowing how far to go without crossing the line.
    %
    Life is like a 10 speed bicycle. Most of us have gears we never use.
    -- C. Schultz
    %
    "Life is like a buffet; it's not good but there's plenty of it."
    %
    Life is like a diaper - short and loaded.
    %
    Life is like a sewer.
    What you get out of it depends on what you put into it.
    -- Tom Lehrer
    %
    Life is like a tin of sardines.
    We're, all of us, looking for the key.
    -- Beyond the Fringe
    %
    Life is like an egg stain on your chin --
    you can lick it, but it still won't go away.
    %
    Life is like an onion: you peel it off
    one layer at a time, and sometimes you weep.
    -- Carl Sandburg
    %
    Life is like an onion: you peel off layer after
    layer and then you find there is nothing in it.
    -- James Huneker
    %
    Life is like arriving late for a movie, having to figure out what was
    going on without bothering everybody with a lot of questions, and then
    being unexpectedly called away before you find out how it ends.
    %
    Life is like bein' on a mule team. Unless you're
    the lead mule, all the scenery looks about the same.
    %
    Life is not for everyone.
    %
    Life is one long struggle in the dark.
    -- Titus Lucretius Carus
    %
    Life is the childhood of our immortality.
    -- Goethe
    %
    Life is the living you do,
    Death is the living you don't do.
    -- Joseph Pintauro
    %
    Life is the urge to ecstasy.
    %
    Life is to you a dashing and bold adventure.
    %
    Life is too short to be taken seriously.
    -- O. Wilde
    %
    Life is too short to stuff a mushroom.
    -- Storm Jameson
    %
    Life is wasted on the living.
    -- The Restaurant at the Edge of the Universe.
    %
    Life is what happens to you while you're busy making other plans.
    -- John Lennon, "Beautiful Boy"
    %
    Life, like beer, is merely borrowed.
    -- Don Reed
    %
    Life may have no meaning, or, even worse,
    it may have a meaning of which you disapprove.
    %
    Life only demands from you the strength you possess.
    Only one feat is possible -- not to have run away.
    -- Dag Hammarskjold
    %
    Life Sucks. Cynical, misanthropic male, 34, looking for soul mate but
    certain not to find her. Drop me a note. I'll call you, we'll talk and
    I'll ask you out to dinner where I'll probably spend more than I can
    afford in a feeble attempt to impress you. Then we'll realize we have
    absolutely nothing in common and we'll go our separate ways, more
    embittered and depressed than before (if such a thing is possible).
    %
    Life sucks, but death doesn't put out at all.
    -- Thomas J. Kopp
    %
    Life without caffeine is stimulating enough.
    -- Sanka Ad
    %
    Life would be so much easier if we could just look at the source code.
    -- Dave Olson
    %
    Life would be tolerable but for its amusements.
    -- G.B. Shaw
    %
    Life's too short to dance with ugly women.
    %
     
  15. Ah! Found it!

    In the header of the post to which you intend to reply, click the link,
    "show options".

    Then, it opens a header in a different background color (at least it
    does on
    my browser), one of the options being "Reply". When I click _that_
    "reply"
    button, it seems to quote context.

    But, of course, you have to be a member of google. ; )
    [interestingly either google's spell checker or Konqueror is hiliting
    'google'. And
    now it's hiliting 'hiliting'. Heh! ;-) - Oops! Spell checker just
    hilited 'Heh'! ;-)

    And there's "Cancel", "Preview", and "Post message" buttons at the
    bottom of
    the text box. I've just previewed this one, and am editing it now, but
    will now
    hit send, irrevocably, obviating the obligatory ohnosecone^Hl^Hc^Hv^Hd.

    ;-D Cheers!
    Rich
     
  16. So, now, I've hijacked the thread to have a conversation with myslef on
    two different windows - two monitors, AAMOF, with xinerama. ;-)

    But it's trivially easy to get google to quote context for you.

    I hate to suggest any such thing as a weekly or so post, just to offer
    the newbies a head-up, because, of course, I'm learning how these things
    work, and the guy elected would, of course, be me.

    I might write something up, though, and look into whether I could do
    it with a reasonably simple script ... hmmm ...

    Nah. Too lazy. ;-)

    Thanks!
    Rich
     
  17. Jim Thompson

    Jim Thompson Guest

    Nope. Just from this question ;-)

    ...Jim Thompson
     
  18. Luo XiaoZen

    Luo XiaoZen Guest

    It seems like _you_ have done quite a lot for this thread alread ;-)
     
  19. Luo XiaoZen

    Luo XiaoZen Guest

    It seems like _you_ have already done quite a lot for this thread ;-)

    Have fun with your life!
     
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