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double quadrature detection - RF Cafe Forums
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| jmariano |
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Post subject: double quadrature detection
Posted: Thu Feb 03, 2011 10:51 am
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Joined: Tue Nov 30, 2010 11:36 am
Posts: 1 |
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Dear All,
Does any one know her I can find a description/analysis of the so called double quadrature
detector? This is basically two IQ detectors acting on the RF signal and on a 180 shifted version of RF.
Then, you make 0-180 and 90-270, to get I and Q.
This is supposed to have better performance than
the simple IQ detector, but I don't know why.
Tanks
josé mariano
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| troy |
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Post subject: Re: double quadrature detection
Posted: Thu Apr 28, 2011 4:30 pm
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Joined: Mon Feb 25, 2008 4:53 pm
Posts: 4 |
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If I understand what you're talking about, a double quadrature converter is where basically where two
sets of I/Q mixing paths are used. The I signal is mixed with the 0deg and 90deg LO signal to create basically
an Ii and an Iq signal, and the Q path is mixed with the same 0deg and 90deg LO to create a Qi and a Qq
signal. Then the Iq and the Qi are mixed to generate the Q output, and the Ii and Qq are mixed to generate
the I output. What results is a cancelling of the image frequency in a way that is more broadband that
when done only with diodes and transformers. I tried to find a good picture of it for you online but couldn't
find anything.
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Posted 11/12/2012
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