maximum hop frequency vs. channel spacing

Discussion in 'Cadence' started by Kuan Zhou, May 21, 2006.

  1. Kuan Zhou

    Kuan Zhou Guest

    Hi,

    I have a question regarding the design of PLLs. A PLL could have a
    channel spacing of 200kHz. And it could have a maximum frequency hop of
    60MHz. What is the difference between these two concepts? Does it mean
    that the maximum frequency hop has to be integer multiple times of the
    channel spacing?

    Is this maximum frequency hop a random number? How is it defined?

    Any info is appreciated!!

    Kuan
     
    Kuan Zhou, May 21, 2006
    #1
  2. Kuan Zhou

    Andrew Beckett Guest

    A better place to ask design-related questions is on
    http://www.designers-guide.org/Forum

    I'm not certain I understand your question, but perhaps that's just a matter of
    knowing what the terms mean in the context of a PLL. I suspect they are talking
    about the fact that you can tune the frequency synthesizer to produce output
    frequencies in a 60MHz range, in steps of 200MHz - presumably by controlling the
    divide ratios in the PLL.

    Regards,

    Andrew.
     
    Andrew Beckett, May 23, 2006
    #2
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