question for the oscillator~

Discussion in 'Homework Help' started by paul1234, Mar 13, 2007.

  1. paul1234

    Thread Starter New Member

    Mar 13, 2007
    in my homework~
    i need to make a oscillator for 2.4GHz

    where can i find the website and the circuit diagram?

    and then~

    i know that the simple oscillator have 3 type of it~
    "wien-bridge oscillator", "colpitts oscillator" and "A coplitts crystal-controlled oscillator"

    which type of it can make 2.4GHz or need the other??
    and which one can easy to make by myself??

  2. antseezee

    Active Member

    Sep 16, 2006
    The Crystal Oscillator would probably fit best for reaching the high frequency requirements, but they're expensive and very small (component size) at frequencies greater than 100MHz. They do have awesome accuracy though, but price may be the biggest concern here.

    The Colpitt's Oscillator would probably be most conventional (PNP transistor, few C's, few R's, few L's), however, I am unsure on the range of frequency it can acquire. It is all based off of the R & C values. It would definitely be the cheaper choice over the Crystal Oscillator.

    I have never built one personally, but I'm sure you can find data pertaining to the matter by searching on:
  3. thingmaker3

    Retired Moderator

    May 16, 2005
    Try the search terms "ghz oscillator" when on Google and you should find a lot to helpful material.
  4. beenthere

    Retired Moderator

    Apr 20, 2004
    I'm not real sure you can get a crystal up to that frequency. You may need a Gunn diode (hot carrier diode) to get up to 2.4 GHz.
  5. Papabravo


    Feb 24, 2006
    A casual construction of a 2.4GHz oscillator is probably beyond the skills of the average electronics hobbyist. Aside from an understanding of imedance matching and proper RF layout techniques, there is the matter of instumentation and measurement equipment for that frequency range.

    The technique is to start with a lower frequency oscillator and use a cascade of frequency doubler and tripler circuits. The final output is divided back down and compared to the reference oscillator to make samll frequency adjustments. In order to construct the waveguides and other components, access to a machince shop wouldn't hurt. You also need a CAD program to compute the dimensions of microstriplines. This is not for the faint of heart.

    Good Luck
  6. RAH1379

    Well-Known Member

    Dec 13, 2005
    look no further than your kitchen, the common microwave oven contains a 2.4 GHz oscillator that uses a magnetron as the active element.