Technique for improving modulation performance of...

Details Technique for improving modulation performance of... Technique for improving modulation performance of...

2006-04-11

2006-04-11

Nguyen, John B (Department: 2819)

Telecommunications

Transmitter

C375S259000, C375S295000, C455S180300, C455S260000

Reexamination Certificate

active

07027780

ABSTRACT:
A transmit signal generated by the baseband processor in a translational loop type RF transmitter is “pre-distorted” so as to counter act magnitude distortion and group delay variation imposed by a narrow PLL signal filter. The pre-distortion occurs in two steps: a magnitude equalizer in the baseband processor pre-distorts the amplitude of the transmit signal according to the inverse of the PLL signal filter magnitude response, and a group delay equalizer linearizes the phase response of the entire transmitter chain, i.e., pre-distorts the transmit signal such that the combined phase response of magnitude equalizer, group delay equalizer, and PLL signal filter is linear. With such pre-distortion, a loop filter is provided for with component values that define a relatively small bandwidth for the loop filter to filter spurious tones that result from an IF reference feedthrough to a voltage controlled oscillator of the translational loop.

REFERENCES:
patent: 5948046 (1999-09-01), Hagberg
patent: 6032028 (2000-02-01), Dickey et al.
patent: 6347121 (2002-02-01), Sointula
patent: 6415001 (2002-07-01), Li et al.
patent: 6614837 (2003-09-01), Abdelgany et al.
patent: 6671500 (2003-12-01), Damgaard et al.
patent: 2002/0183030 (2002-12-01), Damgaard et al.
patent: 2003/0176173 (2003-09-01), Klemmer
patent: 2003/0224736 (2003-12-01), Lin

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