Oscillators – Automatic frequency stabilization using a phase or frequency... – Afc with logic elements
Reexamination Certificate
2007-07-24
2007-07-24
Nguyen, Linh (Department: 2819)
Oscillators
Automatic frequency stabilization using a phase or frequency...
Afc with logic elements
C331S017000
Reexamination Certificate
active
11226047
ABSTRACT:
A clock circuit for outputting serial data without using a PLL is described. The clock is a VCO designed to start at a frequency that is slightly higher than necessary to preserve the data. The frequency of the clock is measured and if the frequency is too high or too low the DC control voltage for the VCO is changed to bring the VCO frequency back to the start frequency. Clock counters, holding registers, comparators, and a D/A form a feed back path around a VCO. In addition, a word boundary generator is used to define individual data words. The word boundary is formed by the absence of a bit clock transition while there is a data bit transition. A high/low threshold may be used where the VCO frequency, as measured, must transcend a threshold before the DC control voltage to the VCO is changed.
REFERENCES:
patent: 4556850 (1985-12-01), McBrien
patent: 4561014 (1985-12-01), Douziech et al.
patent: 4680733 (1987-07-01), Duforestel et al.
patent: 4689740 (1987-08-01), Moelands et al.
patent: 4809166 (1989-02-01), Cooper
patent: 4841549 (1989-06-01), Knapp
patent: 5138634 (1992-08-01), Knapp
patent: 5168245 (1992-12-01), Koskowich
patent: 5559502 (1996-09-01), Schutte
patent: 5668830 (1997-09-01), Georgiou et al.
patent: 5889829 (1999-03-01), Chiao et al.
patent: 5907566 (1999-05-01), Benson et al.
patent: 6031473 (2000-02-01), Kubinec
patent: 6169501 (2001-01-01), Ryan
patent: 6181209 (2001-01-01), Tsai
patent: 6266710 (2001-07-01), Dittmer et al.
patent: 6377575 (2002-04-01), Mullaney et al.
patent: 6396888 (2002-05-01), Notani et al.
patent: 6397042 (2002-05-01), Prentice et al.
patent: 6496540 (2002-12-01), Widmer
patent: 6516952 (2003-02-01), Wang et al.
patent: 6542096 (2003-04-01), Chan et al.
patent: 6593863 (2003-07-01), Pitio
patent: 6653957 (2003-11-01), Patterson et al.
patent: 6664828 (2003-12-01), Gauthier et al.
patent: 6693918 (2004-02-01), Dallabetta et al.
patent: 6774732 (2004-08-01), Harnishfeger et al.
patent: 6799239 (2004-09-01), VanKrevelen
patent: 6864753 (2005-03-01), Lee et al.
patent: 6880056 (2005-04-01), Kootstra
patent: 6892337 (2005-05-01), Brophy et al.
patent: 6970046 (2005-11-01), Da Dalt et al.
patent: 6985546 (2006-01-01), Kumata
patent: 6998922 (2006-02-01), Jensen et al.
patent: 7023284 (2006-04-01), Sogawa et al.
patent: 7064690 (2006-06-01), Fowler et al.
patent: 2004/0236977 (2004-11-01), Kizer et al.
patent: 2521731 (1976-10-01), None
patent: 60107938 (1985-06-01), None
patent: 02260734 (1990-10-01), None
patent: 2004047345 (2004-06-01), None
Fowler, Michael L. et al., Bit Clock With Embedded Word Clock Boundary, Mar. 6, 2004, U.S. Appl. No. 10/802,436.
Fowler, Michael L. et al., Architecture For Bidirectional Serializer and De-Serializer, Mar. 6, 2004, U.S. Appl. No. 10/802,372.
International Search Report dated May 18, 2005 for Related Appliation No. PCT/US2005/007944.
International Search Report dated May 18, 2005 for Related Application No. PCT/US2005/007945.
International Search Report dated Dec. 6, 2005 for Related Application No. PCT/US2005/009311.
Cesari and McKenna LLP
Fairchild Semiconductor Corporation
Nguyen Linh
Paul, Esq. Edwin H.
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