Telecommunications – Transmitter – Noise or interference elimination
Reexamination Certificate
2008-03-06
2011-11-22
Trinh, Sonny (Department: 2618)
Telecommunications
Transmitter
Noise or interference elimination
C455S115100, C455S114200
Reexamination Certificate
active
08064851
ABSTRACT:
An RF transmitter (60) generates non-DC bias signals (104, 106) configured to improved power-added efficiency (PAE) in the operation of an RF amplifier (94). The RF amplifier (94) generates an amplified RF signal (126) which, due to the addition of the bias signals (104, 106), includes bias-signal-induced RF distortion (48, 50). The bias signals (104, 106) drive a bias-induced distortion cancellation circuit (152) that adjusts the bias signals to compensate for the influence of impedances experienced by the bias signals (104, 106) before being applied to the RF amplifier (94). After mixing with a baseband communication signal (64), adjusted bias signals (186, 188) are combined into a composite baseband signal (76), upconverted to RF in an upconversion section84, and applied to the RF amplifier (94) where they cancel at least a portion of the bias-signal-induced RF distortion (48, 50).
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Crestcom, Inc.
Meschkow & Gresham P.L.C.
Trinh Sonny
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