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Balun

Discussion in 'Electronic Basics' started by sthim, Aug 14, 2003.

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  1. sthim

    sthim Guest

    Could anybody help with understanding baluns? So far I know they
    transform unbalanced input to balanced output and vice-versa. Say I
    have a receiver coil - one that looks like a loop and the ends are
    connected to a balun. The voltages on the ends are of the same
    magnitude but are 180 degrees out of phase. How do these two voltages
    get combined at the output? Or does this not happen? Please let me
    know...

    sthim
     
  2. no_one

    no_one Guest

    transformer
     
  3. John Dyson

    John Dyson Guest

    From a technologist viewpoint, alot of baluns are also based upon 1:1
    transformations (in differing configurations.) It seems like 1:1 transformers
    tend to have wider bandwidth than direct 4:1 (impedance) transformers.

    So, using a 4:1 balun configuration with a natural 1:1 impedance transformer
    as a constituent, it seems to tend to perform better than a 4:1 (impedance) or
    2:1 (voltage) transformer.

    John
     
  4. Boris Mohar

    Boris Mohar Guest

    I have a PDF on this. Just email me and I will send it.

    --

    Regards,

    Boris Mohar

    Got Knock? - see:
    Viatrack Printed Circuit Designs http://www3.sympatico.ca/borism/
    Aurora, Ontario
     
  5. There is always the Guanella 4:1 balun to consider that has a theoretically
    infinite cut off frequency.
     
  6. Mjolinor

    Mjolinor Guest

    The best reading I have found on these mystical items is by Jerry Sevick.
    There are a few papers by him, unfortunately they are IEEE and therefore
    cost an arm and a leg and a good book "Transmission Line Transformers"
    published by Noble. It's a bit hard to get but worth the effort.
     
  7. John Dyson

    John Dyson Guest

    I understand that... Before I 'studied' the subject, I was also confused
    (like the original poster) about the real difference between a 'transformer'
    and a special configuration called a 'balun.' When I was a kid, and didn't
    realize the almost subtile differences, I almost thought that the term
    was gratuitious (however incorrectly.) The whole area of transmission line
    transformers, traditional transformers and various configurations can be
    quite interesting and enlightening !!! :).

    John
     
  8. There is also a directional coupler that can be formed from two cleverly connected
    conventional transformers as shown in US Patent 3,426,298 Figure 10.
     
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