Pulse or digital communications – Transmitters – Antinoise or distortion
Reexamination Certificate
2005-09-20
2008-12-30
Tse, Young T. (Department: 2611)
Pulse or digital communications
Transmitters
Antinoise or distortion
C375S296000, C330S149000, C332S162000, C455S114300
Reexamination Certificate
active
07471739
ABSTRACT:
The present invention is related to methods and apparatus that advantageously permit the more efficient use of an input range of an analog-to-digital converter used by an adaptive predistortion linearized RF transmitter. A main signal component of a down-converted output of an RF transmitter is removed prior to the analog-to-digital conversion of the down-converted output, thereby allowing more of the input range of the analog-to-digital converter to capture an error signal component of the down-converted output. Embodiments of the present invention can thus adaptively tune the predistortion stage to a higher degree of linearity or can use lower cost analog-to-digital converters with fewer quantization steps for the same performance.
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Knobbe Martens Olson & Bear LLP
PMC-Sierra Inc.
Tse Young T.
LandOfFree
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