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90 degree phase shifter

Discussion in 'Electronic Design' started by jp, Mar 15, 2006.

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  1. Rich Grise

    Rich Grise Guest

    Hm. According to this, there is no such tning. No wonder you Brits are
    such squares. ;-P

    Cheers!
    Rich
     
  2. Jim Thompson

    Jim Thompson Guest

    pi are round, cakes are square ;-)

    ...Jim Thompson
     
  3. Ken Smith

    Ken Smith Guest


    Y = sin(0t)

    Shifted version

    Y = sin(0t + PI/2)

    1V does sound like enough.
     
  4. Keith

    Keith Guest

    He let 'em eat cake!
     
  5. Guest

    Well your question is nonsence, try again, someone might help you out.
     
  6. John_H

    John_H Guest

    Your response is nonsense, try again, there's already been a lot of help
    from people who have a clue.
     
  7. John Fields

    John Fields Guest

     
  8. Guest

    Lets see now, a 0hz sinewave? now lets try and phaseshift it.
     
  9. John Fields

    John Fields Guest

    ---
    OK, here's the way I suggested:


    COUNT SIN ROM SIN DAC
    +------+ +-------+ +-------+
    HFCK>--+--|> Qn|--+--------|An Dn|---|Dn OUT|--[R]--+-->SIN
    | . . | . . . . |
    | . . | . . . . [C]
    | . . | . . . . |
    | | Q0|--|-----+--|A0 D0|---|D0 | GND
    | +------+ | | +-------+ |__ |
    +------------|-----|-------------O|LE |
    | | | +-------+
    | | |
    | | |
    | | | COS ROM COS DAC
    | | | +-------+ +-------+
    | +-----|--|An Dn|---|Dn OUT|--[R]--+-->COS
    | | . . . . |
    | | . . . . [C]
    | | . . . . |
    | +--|A0 D0|---|DO | GND
    | +-------+ |__ |
    +--------------------------------O|LE |
    +-------+

    Note that if HFCK is stopped the frequency of SIN and COS will be
    0Hz, but there will still be a 90° amplitude difference between
    them.
     
  10. Guest

    This seems to come down to the problem of how you resolve a DC voltage
    into its phase and magnitude.

    If you know or can safely presume a representation of the form A sin (
    Bt + c ) then you can easily phase shift it.

    If you don't know, can't request more information, and can't get away
    with making an arbitrary decision, then yes you have an undefined
    problem.
     
  11. Mathematically speaking, it's perfectly acceptable. In fact, I would
    be more worried about a model that treated 0 as a special case.

    And since it is hard to describe a range whose lower bound is 0 without
    using 0 as the lower bound...

    -Le Chaud Lapin-
     
  12. Rich Grise

    Rich Grise Guest

    You may send your check to:
    Richard Grise
    c/o ABI Engineering
    12143 Rivera Rd.
    Whittier, CA 90606

    Please pay to the order of Richard M. Grise.

    Thanks!
    ;-)
    Rich
     
  13. Huh?

    X >= 0 is a lot different from X > 0, in a lot of ways - ask any
    programmer! :)

    Cheers!
    Rich
    --
    Elect Me President in 2008! I will:
    A. Fire the IRS, and abolish the income tax
    B. Legalize drugs
    C. Stand down all military actions by the US that don't involve actual
    military aggression against US territory
    D. Declare World Peace I.
     
  14. John Fields

    John Fields Guest

     
  15. John Larkin

    John Larkin Guest

    With a big army, I assume.

    John
     
  16. Declarations require little more than a piece of paper or a
    microphone. Reality is something else.

    Kal
     
  17. That's kind of an oxymoron, as you know. As Commander-in-Chief of
    all of the US Military, I would simply declare it unilaterally,
    and simply lead by example.

    What's the only country on Earth that's currently engaged in aggression
    against one or more foreign countries?

    Thank you very much.

    Cheers!
    Rich
    --
    Elect Me President in 2008! I will:
    A. Fire the IRS, and abolish the income tax
    B. Legalize drugs
    C. Stand down all military actions by the US that don't involve actual
    military aggression against US territory
    D. Declare World Peace I.
     
  18. By making armies unnecessary. :)

    Cheers!
    Rich
    --
    Elect Me President in 2008! I will:
    A. Fire the IRS, and abolish the income tax
    B. Legalize drugs
    C. Stand down all military actions by the US that don't involve actual
    military aggression against US territory
    D. Declare World Peace I.
     
  19. And don't forget, this follows A, B, and C - get them done,
    and nobody will feel like fighting. ;-)

    Cheers!
    Rich
    --
    Elect Me President in 2008! I will:
    A. Fire the IRS, and abolish the income tax
    B. Legalize drugs
    C. Stand down all military actions by the US that don't involve actual
    military aggression against US territory
    D. Declare World Peace I.
     
  20. John Larkin

    John Larkin Guest

    Your A, B, and C conditions were true for most of human history. And
    human history is overwhelmingly the history of war.

    John
     
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