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Designing a VCO

Discussion in 'Electronic Design' started by Mounir, Oct 24, 2005.

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  1. Mounir

    Mounir Guest

    Hello everyone!!

    Well, Im doing a project which requires a VCO in my circuits, the proble
    is im not able to design the one i need (the VCO should oscillate betwee
    85MHz and up to 125MHz only, since these are the allowed free channels)
    can anyone suggest me a design? ty

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  2. Jim Thompson

    Jim Thompson Guest

    Buy either an MC1648 VCO (sine wave) or MC1658 VCM (square wave), both
    designed by yours truly.

    ...Jim Thompson
  3. Guest

    Higher then 109 MHZ is international air navigation band ANYWHERE in
    the world.
    109-138 is the air band range. Sorry if your using high side

    Steve Roberts
  4. Joerg

    Joerg Guest

    Hello Jim,
    Arrow doesn't carry those anymore and ON Semi draws a blank, too.

    But the 1648 now comes with a Porsche engine, MC100EL1648. It's a rocket
    at 1.1GHz and a surprisingly low supply current under 25mA. Did you
    design that one as well?

    Regards, Joerg
  5. DaveM

    DaveM Guest

    MiniCircuits ( makes a line of VCO modules; their model
    POS-150 would fit exactly within your range.

    Freq Range 75-150 MHz
    Output level +9.5 dbm
    Tuning voltage 1-16 VDC

    Dave M
    MasonDG44 at comcast dot net (Just substitute the appropriate characters in
    the address)

    Never take a laxative and a sleeping pill at the same time!!
  6. Jim Thompson

    Jim Thompson Guest

    It's my MC1648 schematic with a bias modification to match 100K TC,
    and processed on 100K.

    ...Jim Thompson
  7. 108-117.975 - Navigation
    118-136.975 - Communications

    So what if he is using high side? The device is still required to meet part
    15 spurious which should limit the range safely.

  8. Joerg

    Joerg Guest

    Hello Jim,
    I guess legally you'd still be the father then because your DNA is in there.

    Regards, Joerg
  9. Jim Thompson

    Jim Thompson Guest

    Yes, I've spread a bit of it around ;-)

    ...Jim Thompson
  10. Is the original plain-jane variety still being produced?

  11. Jim Thompson

    Jim Thompson Guest makes it. They still make quite a few of my
    '60's designs.

    ...Jim Thompson
  12. Mark

    Mark Guest

    look at Mini Circuits..

  13. For these frequencies why not using a DDS and not a VCO/PLL ?

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