I&Q Modulator questions....

Discussion in 'Wireless & RF Design' started by Fovakis, May 22, 2013.

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  1. Fovakis

    Thread Starter New Member

    May 14, 2013
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    Hi. I cannot understand the I&Q Modulator...

    I am reading this one of mini circuits..http://217.34.103.131/pdfs/ZFMIQ-10M.pdf

    It has I and Q inputs...and it write (DC to 2MHz) freq for the input..

    1)is the I and Q analog signals or bit stream ?If is a bit stream how can it has 2MHz frequency?

    2)The I&Q Modulators as i understand make QPSK/8QAM/16QAM etc modulation..so the message I and Q must be bit streams (symbols basic) and carrier analog signal..right?

    3)The output of a I&Q Modulator is exactly like the output of a AM-Modulator (?)...USB, LSB , carrier...what is going on here?

    George
     
  2. w2aew

    Member

    Jan 3, 2012
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  3. Fovakis

    Thread Starter New Member

    May 14, 2013
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  4. Motanache

    Member

    Mar 2, 2015
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    The discussion is older. If someone are interested in this discussion I can explain.

    Two sinusoidal modulated in amplitude and with 90grd phase difference are sums.
    We obtain a complex wave modulated in both in amplitude and angular.

    At the reception Costa's loop must keep in phase........
     
  5. bertus

    Administrator

    Apr 5, 2008
    15,647
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    Hello,

    Did you notice the warning?
    This is an VERY old thread.

    Bertus
     
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