how to generate a signal of 500 MHZ signal?

Discussion in 'Wireless & RF Design' started by yasaswini, Feb 16, 2016.

  1. yasaswini

    Thread Starter New Member

    Feb 15, 2016
    3
    0
    how to generate any signal which is of atleast 500MHZ using transistors ?
    please help me..
     
  2. bertus

    Administrator

    Apr 5, 2008
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  3. Papabravo

    Expert

    Feb 24, 2006
    10,140
    1,790
    What kind 500 MHz. signal? I'd consider Mini-Circuits if I were you.
     
  4. yasaswini

    Thread Starter New Member

    Feb 15, 2016
    3
    0
    If it is not possible only with transistor is it possible by using IC's too?
     
  5. yasaswini

    Thread Starter New Member

    Feb 15, 2016
    3
    0
    what will happen if....
    I use a normal signal generator circuit by simply changing the values of tank circuit by using F=1/(2*pi*(SQR RT (L*C)))
    does this work..
    EX:
    L=22nH
    c=1pF
    then im getting F more than 500MHZ
     
  6. kyka

    New Member

    Jun 7, 2015
    22
    1
    It's not so simple for such high frequencies. You are almost on the boundary between RF and Microwave. These signals are usually the output of a voltage multiplier fed from a stable source (e.g. PLL). So before we say anything else, you should tell us if you want to actually implement this signal generator or construct it in a simulator.
     
  7. DickCappels

    Moderator

    Aug 21, 2008
    2,651
    632
    I think the circuit below would meet the most liberal interpretation of "how to generate any signal which is of atleast 500MHZ using transistors ?" Note that you would need some inductance and capacitance at the very least. The circuit below has been in daily use out-of-doors as an RF remote control transmitter for the last 7 years and has not had the oscillation frequency adjusted since the initial adjustment. The receiver is regenerative.

    I've pushed this circuit to past 500 MHz (the limit of my ability to determine frequency) by reducing the inductance of the loop and reducing the tuning capacitance.


    [​IMG]

    And it can be crudely made and still work as in the photo below, where the resonant loop was cut with a drill equipped with a router bit.
    [​IMG]



    [​IMG]
     
    Willen and Kermit2 like this.
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