Coded data generation or conversion – Digital code to digital code converters – To or from code based on probability
Reexamination Certificate
2011-05-17
2011-05-17
Mai, Lam T (Department: 2819)
Coded data generation or conversion
Digital code to digital code converters
To or from code based on probability
C327S157000
Reexamination Certificate
active
07944376
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: 6114888 (2000-09-01), Walley
patent: 7027780 (2006-04-01), Jensen
patent: 7349677 (2008-03-01), Jensen
patent: 7570187 (2009-08-01), Jensen
Broadcom Corporation
Garlick & Harrison & Markison
Mai Lam T
Rudnick Holly L.
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