Ring modulation, not understanding the choice of part...

Discussion in 'Wireless & RF Design' started by BlackCow, Jun 4, 2011.

  1. BlackCow

    Thread Starter Active Member

    May 11, 2009
    65
    1
    The basic schematic of a ring modulator on the wikipedia page...
    http://en.wikipedia.org/wiki/Ring_modulation

    I noticed the signal inputs / outputs go into transformers. I understand what a transformer does in respect to increasing/decreasing voltage and I understand how inductors work but I don't understand why it is being used for this circuit in this way.

    Couldn't the signals go into the circuit through capacitors? Or perhaps I'm missing a concept here? Could anyone clarify this for me?

    Thanks.
     
  2. KL7AJ

    AAC Fanatic!

    Nov 4, 2008
    2,040
    287
    The ring modulator is actually a form of bridge, not too different from a Wheatstone bridge except for the diodes. When it is balance, there is no output, the signal from one side of the transformer is perfectly canceled out by the signal from the other side. The third port (I.F. port) allows a second signal to unbalance the bridge.


    Eric
     
  3. BlackCow

    Thread Starter Active Member

    May 11, 2009
    65
    1
    So basically the transformers don't set up or down an AC voltage but just couple the signal? Not sure where to find this part... do you think I could wind my own?
     
  4. t_n_k

    AAC Fanatic!

    Mar 6, 2009
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