WO2007056722A3 - Non-linear feedback control loops as spread spectrum clock generator - Google Patents
Non-linear feedback control loops as spread spectrum clock generator Download PDFInfo
- Publication number
- WO2007056722A3 WO2007056722A3 PCT/US2006/060599 US2006060599W WO2007056722A3 WO 2007056722 A3 WO2007056722 A3 WO 2007056722A3 US 2006060599 W US2006060599 W US 2006060599W WO 2007056722 A3 WO2007056722 A3 WO 2007056722A3
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- clock signal
- feedback control
- spread spectrum
- linear feedback
- clock generator
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B15/00—Suppression or limitation of noise or interference
- H04B15/02—Reducing interference from electric apparatus by means located at or near the interfering apparatus
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2215/00—Reducing interference at the transmission system level
- H04B2215/064—Reduction of clock or synthesizer reference frequency harmonics
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2215/00—Reducing interference at the transmission system level
- H04B2215/064—Reduction of clock or synthesizer reference frequency harmonics
- H04B2215/067—Reduction of clock or synthesizer reference frequency harmonics by modulation dispersion
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
- Manipulation Of Pulses (AREA)
Abstract
This patent disclosure presents circuits, systems and methods to spread a clock signal to produce a random spreading for the clock signal that offers the maximum possible power density reduction for the spurious radiations generated from the clock signal and its harmonics. These new inventions utilize a non-linear feedback control loop to assist in generation of the spread spectrum clock and result in electronic products that can pass the FCC requirements for spurious radiations generated by the clock signal and its harmonics without utilizing expensive shielding and other EMI suppression methods.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2008540320A JP2009515488A (en) | 2005-11-07 | 2006-11-07 | Nonlinear feedback control loop as a spread spectrum clock generator. |
US12/092,742 US20090135885A1 (en) | 2005-11-07 | 2006-11-07 | Non-linear feedback control loops as spread spectrum clock generator |
EP06846240A EP1958336A2 (en) | 2005-11-07 | 2006-11-07 | Non-linear feedback control loops as spread spectrum clock generator |
Applications Claiming Priority (18)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US73422205P | 2005-11-07 | 2005-11-07 | |
US60/734,222 | 2005-11-07 | ||
US73759205P | 2005-11-17 | 2005-11-17 | |
US60/737,592 | 2005-11-17 | ||
US74276405P | 2005-12-06 | 2005-12-06 | |
US60/742,764 | 2005-12-06 | ||
US75604006P | 2006-01-04 | 2006-01-04 | |
US60/756,040 | 2006-01-04 | ||
US75764506P | 2006-01-10 | 2006-01-10 | |
US60/757,645 | 2006-01-10 | ||
US80590006P | 2006-06-27 | 2006-06-27 | |
US60/805,900 | 2006-06-27 | ||
US80663906P | 2006-07-06 | 2006-07-06 | |
US60/806,639 | 2006-07-06 | ||
US82333906P | 2006-08-23 | 2006-08-23 | |
US60/823,339 | 2006-08-23 | ||
US82728806P | 2006-09-28 | 2006-09-28 | |
US60/827,288 | 2006-09-28 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2007056722A2 WO2007056722A2 (en) | 2007-05-18 |
WO2007056722A3 true WO2007056722A3 (en) | 2008-07-31 |
Family
ID=38024065
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2006/060599 WO2007056722A2 (en) | 2005-11-07 | 2006-11-07 | Non-linear feedback control loops as spread spectrum clock generator |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1958336A2 (en) |
JP (1) | JP2009515488A (en) |
WO (1) | WO2007056722A2 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9274149B2 (en) | 2012-04-16 | 2016-03-01 | Hamilton Sundstrand Corporation | Frequency phase detection three phase system |
JP6202867B2 (en) * | 2013-04-12 | 2017-09-27 | 三菱電機株式会社 | Spread spectrum clock generator |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5506545A (en) * | 1993-11-09 | 1996-04-09 | Gte Government Systems Corporation | Electronic apparatus having low radio frequency interference from controlled excursion noise-modulated system clock signal |
US5610955A (en) * | 1995-11-28 | 1997-03-11 | Microclock, Inc. | Circuit for generating a spread spectrum clock |
US6294936B1 (en) * | 1998-09-28 | 2001-09-25 | American Microsystems, Inc. | Spread-spectrum modulation methods and circuit for clock generator phase-locked loop |
US6377646B1 (en) * | 1997-07-21 | 2002-04-23 | Cypress Semiconductor Corp. | Spread spectrum at phase lock loop (PLL) feedback path |
US20040160280A1 (en) * | 2003-02-19 | 2004-08-19 | Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | Oscillator |
US6850554B1 (en) * | 1999-11-09 | 2005-02-01 | Cypress Semiconductor Corp. | Circuit and method for controlling a spread spectrum transition |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61253922A (en) * | 1985-05-02 | 1986-11-11 | Japan Radio Co Ltd | Digital phase comparator |
JPH04365223A (en) * | 1991-06-13 | 1992-12-17 | Nec Corp | Phase locked loop circuit |
JPH1174787A (en) * | 1997-08-27 | 1999-03-16 | Sony Corp | Phase locked loop circuit |
JP4283664B2 (en) * | 2001-05-31 | 2009-06-24 | エヌエックスピー ビー ヴィ | Frequency lock loop circuit, clock recovery circuit, and receiver |
JP2005198120A (en) * | 2004-01-09 | 2005-07-21 | Yokogawa Electric Corp | Jitter generator |
US7167059B2 (en) * | 2004-04-08 | 2007-01-23 | Avago Technologies General Ip (Singapore) Pte. Ltd. | Circuit for generating spread spectrum clock |
-
2006
- 2006-11-07 EP EP06846240A patent/EP1958336A2/en not_active Withdrawn
- 2006-11-07 WO PCT/US2006/060599 patent/WO2007056722A2/en active Application Filing
- 2006-11-07 JP JP2008540320A patent/JP2009515488A/en active Pending
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5506545A (en) * | 1993-11-09 | 1996-04-09 | Gte Government Systems Corporation | Electronic apparatus having low radio frequency interference from controlled excursion noise-modulated system clock signal |
US5610955A (en) * | 1995-11-28 | 1997-03-11 | Microclock, Inc. | Circuit for generating a spread spectrum clock |
US6377646B1 (en) * | 1997-07-21 | 2002-04-23 | Cypress Semiconductor Corp. | Spread spectrum at phase lock loop (PLL) feedback path |
US6294936B1 (en) * | 1998-09-28 | 2001-09-25 | American Microsystems, Inc. | Spread-spectrum modulation methods and circuit for clock generator phase-locked loop |
US6850554B1 (en) * | 1999-11-09 | 2005-02-01 | Cypress Semiconductor Corp. | Circuit and method for controlling a spread spectrum transition |
US20040160280A1 (en) * | 2003-02-19 | 2004-08-19 | Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | Oscillator |
Also Published As
Publication number | Publication date |
---|---|
JP2009515488A (en) | 2009-04-09 |
EP1958336A2 (en) | 2008-08-20 |
WO2007056722A2 (en) | 2007-05-18 |
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