DBM: Ring Diode Topology

  1. Hi all. I started a thread a while back about RF mixer design. I didn't know what to do or what design to choose. You guys laid some options for me and after some research and time I have finally decided that I will go for a double balanced, ring diode topology. Here is a schematic from google:
    [​IMG]

    So I think I get the general idea of the circuit and I am ready to simulate it and build it. I am wondering about one thing though, the two balun transformers... Is it possible to buy them already made? If so, how do I choose what I need? I would hate having to wind them myself as my hands do not allow me to undertake such delicate work.

    Thank you PF.
     
  2. jcsd
  3. sophiecentaur

    sophiecentaur 14,127
    Science Advisor
    Gold Member

    It depends on the frequency you are working at (for the cost) but I think they are available at all popular frequencies and would probably work better than a home made version (coil winding is pretty skilled and balance is important).
    See these links
    1, 2, and many others.
     
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  4. davenn

    davenn 3,974
    Science Advisor
    Gold Member
    2014 Award

    I agree with sophiecentaur

    These things are built in a tiny metal box 1" x .5" x .5" and cost peanuts. You would never be able to achieve anywhere near the performance that a commercial one would give you.
    You would be better off putting your efforts to other parts of the RF circuits
    The SBL- 1 ( and SBL-1X) is a wideband mixer I have used often over the years
    Have also used a variety of others that cover other frequency ranges

    cheers
    Dave
     
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  5. Last edited: Aug 13, 2014
  6. sophiecentaur

    sophiecentaur 14,127
    Science Advisor
    Gold Member

    I have played with audio frequency baluns and mixers. Good fun: Ex terrrrrminate!!! (Dr Who / Dalek, quote, for people not in the UK)
     
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