Pulse or digital communications – Transmitters – Antinoise or distortion
Reexamination Certificate
2005-12-14
2009-08-04
Pathak, Sudhanshu C (Department: 2611)
Pulse or digital communications
Transmitters
Antinoise or distortion
C375S296000, C375S295000, C455S126000, C455S127300, C455S114200
Reexamination Certificate
active
07570710
ABSTRACT:
In-phase (I) and quadrature-phase (Q) signals are corrected for both amplitude and phase imbalances by passing the I and Q signals successively through a first amplitude correction stage, a sum-difference stage, and a second amplitude correction stage. The first amplitude correction stage balances the signal levels of the I and Q signals. The sum-difference stage produce a sum of the input I and Q signals, and a difference of the input I and Q signals, resulting in ideal quadrature in the outputs produced. The second amplitude correction stage corrects the amplitude differences from the sum-difference stage. Circuit configurations are used that minimize errors produced by the signal processing stages.
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Fortier Richard Jacques
Lau Wing Fat Andy
Shah Peter Jivan
Greenhaus Bruce W.
Landry Michael W.
Pathak Sudhanshu C
RF Magic Inc.
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