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How do I make an output go high at exactly 0V?

Discussion in 'Electronic Design' started by Boris, Jul 13, 2006.

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  1. Boris

    Boris Guest

    Hello!
    When I´m using a comparator, the output goes to +Vcc when V+>0 (V-
    grounded) and it goes to -Vcc when V+ is less then V-(V- Grounded). Is
    there a configuration that makes an output goes high at exactly 0V? I
    know EXACTLY 0V doesnt exists, so, maybe output go high between 0,03V
    and -0,03V. For Vi > 0 or Vi <0, the output should be zero.
    Regards
    Boris
     
  2. Jim Thompson

    Jim Thompson Guest

    Think about it. Surf for window comparator. Use two comparators and
    wire-OR the result.

    ...Jim Thompson
     
  3. PeteS

    PeteS Guest

    <<Think about it. Surf for window comparator. Use two comparators and
    wire-OR the result. >>

    And if it's a jittery or slow signal make sure you use some positive
    feedback for hysteresis (which can reduce your comparator requirements
    to 1).

    Cheers

    PeteS
     
  4. Guest

    Search for "zero-crossing detector".
     
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