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Discussion in 'Electronic Design' started by RealInfo, Feb 3, 2009.

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  1. RealInfo

    RealInfo Guest

    Hi all

    In a PLL contrlolled Rf amplifier front end how exactly the 1st RF stage
    frequency of the tuned circuit is contrlolled so it
    will be exactly the PLL freq+ IF frequncy ?

  2. One method that gets used is lots of switched caps with varicap
    fine tuning. But all-band radios are inevitably a compromise.

    The key thing is to be exceptionally linear and low-noise across
    a large dynamic range, so intermodulation doesn't become an
    issue before you hit those IF filters, or you get all kinds of
    spurious out-of-band response. The new DTV chipsets are amazing.
  3. MooseFET

    MooseFET Guest

    The tuned circuit has a wide enough band width that a simple circuit
    with varactor diodes will be close enough.

    The VCO tuning can also be a varactor diode. With care the voltage to
    frequency character of the two can be matched.
  4. TheM

    TheM Guest

    Sounds interesting
    What are the specs, model numbers?

  5. Anadigics is one maker, look at their AIT-1010 and AIT-1021.
  6. Jamie

    Jamie Guest

    look up "RF mixer..""
  7. RealInfo

    RealInfo Guest

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