Connect with us

FRONT END WITH PLL

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

Scroll to continue with content
  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 ?

    Thanks
    EC
     
  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?

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

    Jamie Guest

    look up "RF mixer.."


    http://webpages.charter.net/jamie_5"
     
  7. RealInfo

    RealInfo Guest

Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-