RE: [SI-LIST] : Ignorance in I & Q - Thanks

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From: Grossman, Brett (brett.grossman@intel.com)
Date: Mon Feb 26 2001 - 17:59:02 PST


Thanks to all, thought I would pass around a handy little thing I found
based on all the information provided.

http://www.educatorscorner.com/experiments/spectral/SpecAn10.shtml

Best regards,

-Brett

-----Original Message-----
From: Ron Kane [mailto:rkane@inviso.com]
Sent: Monday, February 26, 2001 4:51 PM
To: si-list@silab.eng.sun.com
Subject: RE: [SI-LIST] : Ignorance in I & Q

I and Q refer to "In-phase" and "Quadrature-phase" components of a signal.
Think of a vector in the X-Y plane at an angle off the X-axis. The
projection onto the X-axis is the I and the projection onto the Y-axis is Q.

In the RF world when a signal is downconverted using a mixing
(multiplication) process you'll end up with only a sine-part or cosine-part
result. Sometimes complex downconverters are used so that both components
are available for later processing / demodulation.

Ron
inViso

-----Original Message-----
From: Grossman, Brett [mailto:brett.grossman@intel.com]
Sent: Monday, February 26, 2001 4:24 PM
To: si-list@silab.eng.sun.com
Subject: [SI-LIST] : Ignorance in I & Q

Can any of you RF folks out there lend me a hand and tell me what I & Q are,
and why they are called I & Q?

I know this is a simple question, but none of my old RF books seem to
explain (though a few do use these terms).

Thanks,

-Brett

Brett Grossman
Intel Test Tooling Operations

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