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Multiply 1Hz timebase

Discussion in 'Electronic Design' started by Al Klein, May 21, 2007.

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  1. Al Klein

    Al Klein Guest

    Is it possible to selectivley multiply a 1Hz timebase by whole
    integers, ie. 2,3,4,5 ... Hz? If so, what would be the simplest way,
    without using a microprocessor, PIC, etc.

    Al Kein
     
  2. If you have time to wait for a control loop to settle, you
    divide a voltage dependent oscillator by those integers and
    phase lock the divided clock to the 1 Hz reference.

    A CD4046 chip would do the phase lock:
    http://xtronics.com/kits/ccode.htm
     
  3. Phil Hobbs

    Phil Hobbs Guest


    How evenly spaced do you need the pulses to be, and how long a startup
    time is acceptable? Direct phase locking will work just great if you
    can wait a long time (a minute or thereabouts) for the loop to settle
    down, or if you can stand very unequally spaced pulses, in which case
    you can acquire lock in one cycle.

    Cheers,

    Phil Hobbs
     
  4. Al Klein

    Al Klein Guest

    I would prefer even spaced pulses, even if it takes a minute. Can you
    point me to a suitable circuit?

    I am a bit short on resource materials here, and could find nothing
    sufficiently explicit online.

    Starting with 1Hz, what is the highest practical frequency that can be
    obtained without a range selector?

    Many thanks,

    Al Klein
     
  5. rebel

    rebel Guest

    There is no practical limit - some people phase lock a 10MHz oscillator to a 1Hz
    referecne - but jitter/phase_noise will increase as the multiplier.
     
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