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WO2009098603A1 - Modulateur d'horloge à étalement du spectre - Google Patents

Modulateur d'horloge à étalement du spectre Download PDF

Info

Publication number
WO2009098603A1
WO2009098603A1 PCT/IB2009/050174 IB2009050174W WO2009098603A1 WO 2009098603 A1 WO2009098603 A1 WO 2009098603A1 IB 2009050174 W IB2009050174 W IB 2009050174W WO 2009098603 A1 WO2009098603 A1 WO 2009098603A1
Authority
WO
WIPO (PCT)
Prior art keywords
spread spectrum
control signals
frequency
signals
frequencies
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/IB2009/050174
Other languages
English (en)
Inventor
Okyay Demiryurekli
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Arcelik AS
Grundig Elektronik AS
Original Assignee
Arcelik AS
Grundig Elektronik AS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Arcelik AS, Grundig Elektronik AS filed Critical Arcelik AS
Publication of WO2009098603A1 publication Critical patent/WO2009098603A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • H04B15/04—Reducing interference from electric apparatus by means located at or near the interfering apparatus the interference being caused by substantially sinusoidal oscillations, e.g. in a receiver or in a tape-recorder
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K7/00—Modulating pulses with a continuously-variable modulating signal
    • H03K7/04—Position modulation, i.e. PPM
    • 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

Definitions

  • the present invention relates to an electronic device comprising a controller which controls circuits that apply spread spectrum to the signals for reducing electromagnetic interference (EMI).
  • EMI electromagnetic interference
  • the United States patent document No. US2003118080 discloses a method for reducing electromagnetic interference. According to the method, spread spectrum is applied to the master clock signal and a plurality of slave clock signals are obtained from this signal. Phases of the slave clock signals that will be used in driving different circuits within the system are changed. Electromagnetic interference is reduced by applying slave clock signals, having the same frequency value but different phases, to the circuits.
  • modulation frequency In the current applications, electromagnetic interference is reduced by performing spread spectrum through making changes in the phase of the modulation frequency. However all the circuits that are driven with different signals use a single modulation frequency. In the said applications, due to the reason that modulation frequency is not intervened, the reduction in the amount of electromagnetic interference remains limited and a more effective solution can not be provided.
  • the objective of the present invention is to realize an electronic device comprising a controller that enables the peak value of the electromagnetic energy, which is emitted by the device or circuits to which it is connected to during operation thereof, to be lower.
  • Another objective of the invention is to realize an electronic device comprising a controller that reduces the electromagnetic interference to which the other devices in the same environment or the circuits therein are exposed.
  • a further objective of the invention is to realize an electronic device wherein a plurality of spread spectrum circuits located therein is controlled by a single controller.
  • the electronic device which is realized to fulfill the objective of the present invention and defined in Claim 1 and in its dependent claims, comprises a controller which generates separate control signals for each of the oscillators located at the input of a plurality of spread spectrum circuits.
  • spread spectrum control of all circuits is performed by a single controller. Since the control signals sent to the spread spectrum circuits are signals different from each other which are obtained by changing the amplitude and/or frequency of the spread spectrum signal, the electromagnetic interference and associated undesirable results observed in devices or circuits are minimized.
  • Figure 1 is the schematic view of the inventive electronic device.
  • Figure 2 is the frequency-time graphics of spread spectrum control signals having the same frequency but different phases (prior art).
  • Figure 3 is the frequency-time graphics of spread spectrum control signals having the same amplitude but different frequencies.
  • Figure 4 is the frequency-time graphics of spread spectrum control signals having different amplitudes, frequencies and phases.
  • the inventive electronic device (1) comprises at least two circuits (2) where spread spectrum is applied, an oscillator (3) at the input of each circuit (2) which provides the signal that drives the circuit (2), and a controller (4) which controls the signals being input to the oscillators (3) so as to reduce the electromagnetic interference ( Figure 1).
  • the controller (4) produces different control signals (Sl, S2) for each oscillator (3) by making changes in the modulation frequency, amplitude and/or phase of the master clock signal.
  • the control signals (Sl, S2) are obtained by changing the frequency, amplitude and/or phase values of the master clock signal within the maximum and minimum values range determined during production or use. Since it is aimed to prevent concentration of electromagnetic energy in certain frequencies, the control signals (Sl, S2) transmitted to the oscillators (3) should be set such that they will overlap in a plurality of different frequencies.
  • the controller (4) is generating different control signals (Sl, S2), it makes changes not only in the phase but also in the amplitude and modulation frequency of the master clock signal. This way, concentration of the overlapping between the control signals (Sl, S2) in a limited number of frequencies is prevented and the number of overlapping frequencies is increased. Thus, a more effective spread spectrum is applied in the device (1) and the problem of electromagnetic interference is minimized.
  • control signals are obtained by only applying the master signal in different phases without changing the frequency of the frequency change (modulation frequency).
  • modulation frequency and/or amplitude values of the master signal are also changed by the controller (4) between the upper and lower limits.
  • the number of frequencies where the control signals (Sl, S2), which are obtained by also changing the frequency and/or amplitude values, overlap with each other increases.
  • concentration of electro- magnetic energy is distributed to more frequencies and negative electromagnetic impacts (interference) are reduced.
  • Increase of the number of frequencies where the control signals (Sl, S2), which are obtained by changing the modulation frequency, phase and/or amplitude of the master signal, overlap is illustrated below by means of three examples:
  • the controller (4) obtains different control signals (Sl, S2) by making changes in the modulation frequency, amplitude and/or phase of the master signal, and it uses these signals in driving the oscillators (3) located at the input of the circuits (2) within the device (1).
  • Sl, S2 different control signals

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

La présente invention porte sur un dispositif électronique (1) comprenant un dispositif de commande (4) qui produit différents signaux de commande (S1, S2) en apportant des changements dans un signal maître et commande les circuits (2) auxquels un étalement du spectre est appliqué au moyen de ces signaux (S1, S2).
PCT/IB2009/050174 2008-02-05 2009-01-19 Modulateur d'horloge à étalement du spectre Ceased WO2009098603A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR200800724 2008-02-05
TR2008/00724 2008-02-05

Publications (1)

Publication Number Publication Date
WO2009098603A1 true WO2009098603A1 (fr) 2009-08-13

Family

ID=40636569

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2009/050174 Ceased WO2009098603A1 (fr) 2008-02-05 2009-01-19 Modulateur d'horloge à étalement du spectre

Country Status (1)

Country Link
WO (1) WO2009098603A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114422709A (zh) * 2022-03-28 2022-04-29 深圳市爱图仕影像器材有限公司 时间码生成电路、时码器及时码器的信号生成方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6240123B1 (en) * 1998-07-20 2001-05-29 Intel Corporation Asynchronous spread spectrum clocking
US20020171457A1 (en) * 2001-05-15 2002-11-21 Rohm Co., Ltd. Method of generating a clock, a clock generation device, and electronic apparatuses having a clock generation device
WO2003039045A2 (fr) * 2001-10-26 2003-05-08 Lexmark International, Inc. Procede et appareil permettant de doter de multiples circuits generateurs d'horloge a spectre etale de frequences de sortie a recouvrement
US20030118080A1 (en) * 2001-12-26 2003-06-26 Hailey Jeffery Charles Advanced spread spectrum clock generation technique for EMI reduction of multiple clock sources
WO2003079562A2 (fr) * 2002-03-14 2003-09-25 Genesis Microchip, Inc. Procede et dispositif faisant intervenir des techniques de synthese numerique directe et de spectre etale afin de reduire les interferences electromagnetiques dans des appareils d'affichage numerique
US20060076997A1 (en) * 2004-08-12 2006-04-13 Nec Electronics Corporation Spread spectrum clock generating apparatus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6240123B1 (en) * 1998-07-20 2001-05-29 Intel Corporation Asynchronous spread spectrum clocking
US20020171457A1 (en) * 2001-05-15 2002-11-21 Rohm Co., Ltd. Method of generating a clock, a clock generation device, and electronic apparatuses having a clock generation device
WO2003039045A2 (fr) * 2001-10-26 2003-05-08 Lexmark International, Inc. Procede et appareil permettant de doter de multiples circuits generateurs d'horloge a spectre etale de frequences de sortie a recouvrement
US20030118080A1 (en) * 2001-12-26 2003-06-26 Hailey Jeffery Charles Advanced spread spectrum clock generation technique for EMI reduction of multiple clock sources
WO2003079562A2 (fr) * 2002-03-14 2003-09-25 Genesis Microchip, Inc. Procede et dispositif faisant intervenir des techniques de synthese numerique directe et de spectre etale afin de reduire les interferences electromagnetiques dans des appareils d'affichage numerique
US20060076997A1 (en) * 2004-08-12 2006-04-13 Nec Electronics Corporation Spread spectrum clock generating apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114422709A (zh) * 2022-03-28 2022-04-29 深圳市爱图仕影像器材有限公司 时间码生成电路、时码器及时码器的信号生成方法

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