Technique for improving modulation performance of...

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

2006-01-03

2009-08-04

Mai, Lam T (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

C455S118000, C375S297000, C330S053000

Reexamination Certificate

active

07570187

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: 5579342 (1996-11-01), Crozier
patent: 5638404 (1997-06-01), Crozier
patent: 7027780 (2006-04-01), Jensen
patent: 7378902 (2008-05-01), Sorrells et al.
patent: 7414469 (2008-08-01), Sorrells et al.

Affiliated with

Also associated with

Rating

Technique for improving modulation performance of... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Technique for improving modulation performance of..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Technique for improving modulation performance of... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4060345