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Basic Frequency SynthesizerQuestion

Discussion in 'Electronic Basics' started by Sommes, Oct 31, 2004.

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  1. Sommes

    Sommes Guest

    If I put a SN7490(divided by five) IC in a Frequency Synthesizer PLL
    cirucit. Is it equal to input frequency * 5?

  2. dB

    dB Guest

    The output of the chip, using just the divide by 5 section, will be
    one fifth of the input frequency, not 5 times.
    Your good health.
  3. Bob Masta

    Bob Masta Guest

    If you put it between the output of the VCO and the
    reference input of the phase comparator, then the
    VCO output frequency will be 5 times the frequency
    on the external input to the phase comparator, on
    average. The output of the divider will be 1/5 of the
    VCO output and will equal the external input.

    Bob Masta

    D A Q A R T A
    Data AcQuisition And Real-Time Analysis
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