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Re: [Discuss-gnuradio] direct conversion compensation


From: Peter Monta
Subject: Re: [Discuss-gnuradio] direct conversion compensation
Date: Sun, 09 Dec 2007 19:47:37 -0800
User-agent: Thunderbird 2.0.0.9 (X11/20071115)

> [ I/Q compensation ]

There's some discussion in Razavi's "RF Microelectronics", section 5.2.2,
and Kenington's "Software Defined Radio", section 5.3.1.1.  The distinction
you mention between DC and AC might come from this LO self-mixing
business, a nonlinear effect, and indeed only at DC since it involves
the LO mixing with itself at some random amplitude and phase.  AC
coupling would eliminate this artifact, but it would do nothing for the
linear I/Q mismatch errors.

Maybe future versions of the dbsrx could have I/Q compensation parameters
in the EEPROM.  Or is something there already?

Cheers,
Peter





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