Compensated digital frequency synthesizer

Oscillators – Automatic frequency stabilization using a phase or frequency... – Afc with logic elements

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

331 16, 331177R, 331179, 332123, 375118, 455 76, 455119, 455258, H03L 700, H04B 140

Patent

active

053312937

ABSTRACT:
A digital frequency synthesizer circuit with spur compensation includes a demodulator circuit (118) for demodulating the output signal (116) of the synthesizer's accumulator (108). Demodulator (118) also inverts the signal, and provides an inverted demodulated output signal (142) which is then coupled to the synthesizer clock (124) after passing through a gain stage (122) in order to modulate the synthesizer clock (124) with a compensation signal (146). The compensated clock signal (140) is then sent to accumulator (108) in order to substantially cancel out any jitter in the accumulator's output signal (116). The modulation signal (MOD IN) which is digitally applied to accumulator (108) is applied in analog fashion to the gain stage (122) in order to prevent the desired modulation signal (MOD IN) from being canceled in the output signal (116).

REFERENCES:
patent: 4816774 (1989-03-01), Martin
patent: 4901265 (1990-02-01), Kerr et al.
patent: 4905177 (1990-02-01), Weaver, Jr. et al.
patent: 5021754 (1991-06-01), Shepherd et al.
patent: 5111162 (1992-05-01), Hietala et al.
patent: 5130671 (1992-07-01), Shahriary et al.
patent: 5162763 (1992-11-01), Morris
patent: 5184092 (1993-02-01), Shahriary et al.
"Communication Circuits: Analysis and Design" by Kenneth K. Clarke and Donald T. Hess, Sep. 198, pp. 615-618. Addison-Wesley.
"Q2334 Dual Direct Digital Synthesizer Technical Data Sheet" Jun. 1991, pp. 1-35 by Qualcomm, Inc. (no author).

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Compensated digital frequency synthesizer does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Compensated digital frequency synthesizer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Compensated digital frequency synthesizer will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-522870

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.