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RF frequency divider

Discussion in 'Electronic Design' started by [email protected], Jul 26, 2006.

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  1. Guest

    Hi,

    I need to take a 66Mhz square wave off a 50 ohm feed and divide its
    frequency down to somwhere below 20Mhz, so say by a factor of 4. Does
    anyone have any idea where I might be able to purchase a frequency
    divider (say one 4, or two 2's) that will operate in this setting.
    Ideally it would be great to find a boxed up component that has SMA
    connectors, given my time constraints. I can't use a mixer in my
    setting given that I won't have a reference signal, so a divider is a
    must. I've tried mini-circuits and googled to the max so any ideas
    would be greatly appreciated. Thanks,

    Kevin
     
  2. Kevin,

    A 74HC74 will do the trick. Two D-type flip-flops with a maximum clock
    frequency of 76MHz. (According to Philips datasheet.)

    petrus bitbyter
     
  3. Guest

    What amplitude signals are you working with? Do you need 50 ohms out as
    well?
     
  4. A little spendy, but ready to go:

    http://tinyurl.com/mqj5d


    What voltage level is the signal? If it's less than a few volts p-p,
    you'll need a little amplifier to get it up to logic levels, and that
    can get tricky.
     
  5. Phil Allison

    Phil Allison Guest

    <


    ** You need an " ECL prescaler".

    http://www.google.com.au/search?hl=en&q=ecl+prescaler+&btnG=Google+Search&meta=


    Beware - these may or may not produce a square wave output.





    ........ Phil
     
  6. Guest

    This would be perfect if it was more around the $100 range. So in
    response to all the input again is 66Mhz 50 ohms, but for the output I
    just need to meet TTL specs for the high and low voltages, so an SMA
    box that has 50 ohm output like the above suggestion, but more
    streamlined and cheaper would be the best. But this may be too
    optimistic of a hope.......
     
  7. Phil Allison

    Phil Allison Guest

    ** BEWARE: Major Groper Alert !!!!!!!

    Waaaaaaaaaaarrrrrrrrrhhhhhhhhheeeeeerrrrrrrhhhhhhhh .......



    ** Hey, Big Kev the FUCKWIT !!!!!!!!!!!!

    Do you EVEN have the slightest DAMN clue what VOLTAGE is ?????



    ** See my post re: "ECL prescaler" at all - Kev ????????

    Or too damn busy WANKING yourself blind in public ????




    ** There is a very important distinction between "optimism" and a rabid
    case of "narcissism".

    Shame you have no clue about that either - Big Kev.



    ....... Phil
     
  8. Guest

    My friend as I stated before I don't want a chip. I was hoping someone
    might know of a vendor that sells sma boxed 50 ohm dividers that are in
    the $100 range that meet my 66Mhz spec. I'm sorry you haven't been
    layed of recent. Enjoy your time on the web today.
     
  9. Phil Allison

    Phil Allison Guest

    ** BEWARE: Major Groper Alert !!!!!!!

    Waaaaaaaaaaarrrrrrrrrhhhhhhhhheeeeeerrrrrrrhhhhhhhh .......



    ** Shame you are not up to eating fish either.



    ** Shame you never supplied us any FUCKING spec - you posturing ****.


    GO TO HELL !!!!




    ........... Phil
     
  10. Especially if you have a 10mVpp level. Even the PRL-255CN requires 2V.
    Apparently you're either a newbie or sleepy as you don't seem to realize
    that 66MHz 50 Ohms says nothing about this signal level.

    As an aside, this group is about *design*. So most members think in that
    direction when you ask a question. Eventually it's the way you'll have to go
    if you really need it and it's nowhere for sale.

    petrus bitbyter
     
  11. Guest

    The 66Mhz 50Ohm signal is sufficiently large, ~5vpp (no dc bias), if i
    need to I can add an amp no problem. With that said I appreciate any
    ideas for where I might be able to find the frequency divider that I
    spoke of earlier. thanks again.
     
  12. Guest

    The 66Mhz 50Ohm signal is sufficiently large, ~5vpp (no dc bias), if i
    need to I can add an amp no problem. With that said I appreciate any
    ideas for where I might be able to find the frequency divider that I
    spoke of earlier. thanks again.
     
  13. bg

    bg Guest

    wrote in message
    Try searching for a frequency counter prescaler. These used to be fairly
    common accessories for test equipment.
    bg
     
  14. jasen

    jasen Guest

    what power level can we expect on the line then?
    Bye.
    Jasen
     
  15. jasen

    jasen Guest

    with a signal like that, there's a bunch of people here could build you one
    for $100

    it seems to me that all that's needed is to terminate the coax (unless this
    is intended as a tap) scale the voltage to something compatible with your
    favourite IC family and divide it by 4 with a <$1 chip.
     
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