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Phase comparator

Discussion in 'Electronic Components' started by [email protected], Nov 5, 2008.

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  1. Guest

    Hi,
    I would like to compare the phase of two 40 MHz signals and get an
    output voltage proportional to their phase shift. Although I found
    some phase comparator ICs like MM54C932,MM74C932 , TC5081BP and
    CD4046BC,Its not clear to me that they work properly with 40Mhz Input
    and 3.3 output voltage.
    Regards,
    Rajeev
     
  2. They probably won't work up there.

    They are also intended for use in phase locked loops, where conditions
    define the design. I don't know whether that would affect use in
    your application.

    The good news is that you are talking about two signals of the same
    frequency, rather than trying to lock one signal to another. In that
    case, any mixer will do, since non of the complications of a wide
    frequency difference are in effect.

    So a double balanced mixer of some sort will do. If the signals
    are already digital, an exclusive-or gate will do.

    Sort of long before there were IC phase locked loops, all phase
    comparators were analog. And they all pretty much amounted to a double
    balanced mixer of some sort. Maybe not today, but it used to be
    that any introduction to PLLs would start with a description of a basic
    PLL and it would be using an analog phase comparator.

    Michael
     
  3. neon

    neon

    1,325
    0
    Oct 21, 2006
    if you want cheap phase comparitor just put two gate cross couple them and feed the input trougha cap resistor pull up and sample and hold.
     
  4. kilowatt

    kilowatt Guest

    Hi

    Is the application only for phase detection or a complete synthesizer
    module. 40MHz you say.?

    How about other ics such as the NE564N @50MHz by signetics..
    Then there is the compare only ecl version MC12040P that should cover
    anything up to 80MHz.

    KW
     
  5. FK

    FK Guest

    sorry for iintruding in but i have a similar problem only my sine
    waves are 125 hz does the same solution apply to my problem and arent
    there any Ic's available that i could use
     
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