BJT mixer design

Discussion in 'Wireless & RF Design' started by froten_140, Jan 7, 2011.

  1. froten_140

    Thread Starter Active Member

    Jun 4, 2006
    30
    4
    Hi all,

    I trying to design a simple BJT mixer for AM receiver. I tried many circuits found on the internet but I want to design my own circuit with the LO injected through the emitter and the IF out through tuned circuit on the collector, but I have quision:

    What is the non-linearity that should be used? is it V-I of the base-emitter junction, saturation regon or cutoff regon.

    this is just a simple circuit, so i'm worrying about IP3, strong stations ........

    any help is very appreciated. ​
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,638
    2,344
    Hello,

    Mixing of RF signals is done by the non-linearity of components like diodes.
    In the attached PDF you will find some information on it.

    The PDF was found on this page from the EDUCYPEDIA on radio circuits:
    http://www.educypedia.be/electronics/radiotuning.htm

    Bertus
     
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