WO2005117267A1 - システムクロック発生回路 - Google Patents
システムクロック発生回路 Download PDFInfo
- Publication number
- WO2005117267A1 WO2005117267A1 PCT/JP2004/007196 JP2004007196W WO2005117267A1 WO 2005117267 A1 WO2005117267 A1 WO 2005117267A1 JP 2004007196 W JP2004007196 W JP 2004007196W WO 2005117267 A1 WO2005117267 A1 WO 2005117267A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- signal
- circuit
- frequency
- system clock
- output signal
- 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
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/14—Digital recording or reproducing using self-clocking codes
- G11B20/1403—Digital recording or reproducing using self-clocking codes characterised by the use of two levels
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10009—Improvement or modification of read or write signals
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10009—Improvement or modification of read or write signals
- G11B20/10046—Improvement or modification of read or write signals filtering or equalising, e.g. setting the tap weights of an FIR filter
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10009—Improvement or modification of read or write signals
- G11B20/10222—Improvement or modification of read or write signals clock-related aspects, e.g. phase or frequency adjustment or bit synchronisation
- G11B20/1024—Improvement or modification of read or write signals clock-related aspects, e.g. phase or frequency adjustment or bit synchronisation wherein a phase-locked loop [PLL] is used
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10009—Improvement or modification of read or write signals
- G11B20/10305—Improvement or modification of read or write signals signal quality assessment
- G11B20/10398—Improvement or modification of read or write signals signal quality assessment jitter, timing deviations or phase and frequency errors
- G11B20/10425—Improvement or modification of read or write signals signal quality assessment jitter, timing deviations or phase and frequency errors by counting out-of-lock events of a PLL
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10009—Improvement or modification of read or write signals
- G11B20/10305—Improvement or modification of read or write signals signal quality assessment
- G11B20/10398—Improvement or modification of read or write signals signal quality assessment jitter, timing deviations or phase and frequency errors
- G11B20/10435—Improvement or modification of read or write signals signal quality assessment jitter, timing deviations or phase and frequency errors by verifying the timing of predetermined signal patterns, e.g. sync patterns
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/08—Details of the phase-locked loop
- H03L7/085—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
- H03L7/093—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal using special filtering or amplification characteristics in the loop
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
- H03L7/22—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using more than one loop
- H03L7/23—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using more than one loop with pulse counters or frequency dividers
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
- G11B2020/1264—Formatting, e.g. arrangement of data block or words on the record carriers wherein the formatting concerns a specific kind of data
- G11B2020/1265—Control data, system data or management information, i.e. data used to access or process user data
- G11B2020/1267—Address data
- G11B2020/1269—Absolute time in pregroove [ATIP] information
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B2220/00—Record carriers by type
- G11B2220/20—Disc-shaped record carriers
- G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
- G11B2220/2537—Optical discs
Definitions
- the present invention relates to a system clock generation circuit, and in particular, can reproduce data of a double signal at a CAV (—constant rotation speed), and the obtained system clock signal has little jitter and lacks a double signal.
- the present invention relates to a digitized system clock generation circuit capable of generating a stable system clock signal for the system.
- the write data is EFM-modulated, and a laser beam controlled for writing by a laser controller is used. Data is written by irradiating the track.
- a synchronization signal for controlling rotation and address information are recorded as a wobble signal.
- the wobble signal is a signal that is FSK-modulated with a bi-phase code modulation signal (BIDATA), and the wobble frequency fWBL is 22.05 ⁇ lkHz when the disk rotation is at a specified linear velocity (at 1x speed playback). )become.
- BIDATA bi-phase code modulation signal
- An ATIP (absolute 'time' in 'pregroup) signal containing absolute time information reproduced from a wobble signal is composed of a sync signal, address data (absolute time data), and an error detection code CRC as BIDATA.
- the unit is 42 bits.
- the repetition frequency of the synchronization signal is 75 Hz.
- a demodulation circuit for demodulating the data of the wobble signal is required.
- Patent Document 1 A circuit described in Patent Document 1 is known as this type of system clock generation circuit.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2001-143404
- FIG. 5 is a diagram showing a schematic configuration of a system clock generation circuit synchronized with a wobble signal introduced in Patent Document 1 and the like.
- the system clock generation circuit shown in FIG. 5 is configured as a PLL circuit, and operates so that the detected wobble signal WBL is locked to the system clock signal WPCLK.
- Phase comparison circuit 10 speed (frequency) comparison circuit 20
- charge pump circuit 30 charge pump circuit 30
- LPF low-pass filter
- VCO voltage controlled oscillator
- N N is an integer
- a spindle motor for driving the optical disk is driven to rotate at a constant speed.
- the wobble frequency fWBL becomes 22.05 ⁇ lkHz in the inner circumference of the track of the optical disc.
- the wobble frequency fWBL is higher than 22.05 ⁇ 1kHz.
- the frequency change range of the cobble frequency fWBL is, for example, about 22 kHz to 53 kHz.
- the wobble signal WBL is input to one input terminal A of the phase comparator 10 and the speed (frequency) comparator 20.
- the output of the VCO 60 is divided by N by the frequency divider 70 and input.
- the phase comparison circuit 10 outputs a charge-up signal that is high during a period corresponding to the phase difference from the rise of the input signal at the input terminal A to the rise of the input pulse at the input terminal B, and the inversion buffer amplifier It is sent to the charge pump circuit 30 via 31.
- phase comparison circuit 10 sends to the charge pump circuit 30 a charge-down signal that is high during a period corresponding to the phase difference from the rise of the input pulse at the input terminal B to the rise of the input noise at the input terminal A. .
- the speed comparison circuit 40 also generates a signal based on the difference in speed (frequency), supplies the charge-up signal to the p-channel transistor 43 via the inversion buffer amplifier 41, and converts the charge-down signal to n. Supply to channel transistor 44.
- the charge pump circuit 30 It comprises an inverted buffer amplifier 31, a constant current source 32, a p-channel transistor 33, an n-channel transistor 34, and a constant current source 35.
- the charge pump circuit 40 includes an inversion buffer circuit 41, a constant current source 42, a p-channel transistor 43, an n-channel transistor 44, and a constant current source 45.
- the constant current 10 is supplied to the low-pass filter 50 based on the charge-up signal from the phase comparator 10, and the constant current 10 is extracted from the low-pass filter 50 as a sink current to the charge pump circuit 30 based on the charge-down signal. It is.
- the constant current II is supplied to the low-pass filter 50 by the charge-up signal from the speed comparison circuit 20, and the constant current II is drawn out to the charge pump circuit 40 as a sink current based on the charge-down signal.
- the low-pass filter (LPF) 50 is composed of a resistor R and capacitors Cl and C2. The potential of the signal line 51 changes due to the inflow of the charge-up current and the outflow of the charge-down current, and the smoothed voltage controls the VCO 60.
- the VCO 60 outputs an oscillation output signal having a frequency that can follow the wobble signal WBL according to the control voltage.
- the 1 / N frequency-divided signal is fed back and supplied to the phase comparison circuit 10 and the speed comparison circuit 20, whereby a PLL loop control state is set.
- the wobble signal WBL and the system clock signal WPCLK are locked.
- a phase comparison circuit 10 for performing phase comparison and a speed comparison circuit 20 for performing speed (frequency) comparison, are required.
- a phase comparison circuit 10 for performing phase comparison and a speed comparison circuit 20 for performing speed (frequency) comparison, are required.
- a phase comparison circuit 10 for performing phase comparison and a speed comparison circuit 20 for performing speed (frequency) comparison.
- a speed comparison circuit 20 for performing speed (frequency) comparison are required.
- To operate the system clock WPCLK in a wide range from 1 ⁇ to 56 ⁇ it is necessary to change the value of the constant current 10, II or the resistance R.
- the single-pass filter circuit 50 requires two external capacitors C1 and C2.
- the system clock generation circuit used in the conventional data demodulation circuit has a large analog circuit mounting area. There is a problem that the top area becomes large. In addition, there is also a problem that adjustment is complicated because two external capacitors are used.
- the present invention has been made to solve the above-described problems, and it is an object of the present invention to reduce the number of external capacitors, to provide a low-pass filter having a simple configuration, and to stop using a charge pump circuit to reduce the circuit scale. It is an object of the present invention to provide a data demodulation circuit for a wobble signal.
- a system clock generating circuit rotates an optical disc at a constant rotational speed (CAV) and locks the optical disc based on the extracted pebble signal to the pebble signal for performing CAV recording on the optical disc.
- CAV constant rotational speed
- a system clock generating circuit for generating a clock signal a first PLL circuit for frequency and phase clocking the wobble signal and a first reference clock signal, and a first output signal from the first PLL circuit And the system clock signal, and outputs a second output signal based on the difference between the frequency and the phase, a frequency'phase comparator (FPC), and a predetermined cutoff to the second output signal.
- FPC frequency'phase comparator
- a PLL filter for outputting a third output signal; and a pulse wave having a carrier frequency of a second reference clock signal is generated.
- the pulse wave is generated by the third output signal.
- a pulse width modulation circuit that outputs a fourth output signal having a modulated pulse width, a low-pass filter that applies a predetermined cutoff to the fourth output signal, smoothes the output signal, and outputs a fifth output signal,
- a VC ⁇ circuit for generating a sixth output signal having an oscillation frequency in a predetermined frequency range using the fifth output signal as a control voltage, and dividing the sixth output signal by N (N is an integer) to obtain A first frequency divider that outputs a system clock signal; and a second frequency divider that divides the system clock signal by M (M is an integer) and feeds it back to the frequency / phase comparator (FPC). It is characterized by doing.
- the present invention provides a system clock generation circuit which detects a phase difference between a sub-synchronization signal (SUBsync) output from an encoder output of CAV recording information and an ATIP synchronization signal (ATIPsync) obtained from the above-mentioned wobble signal.
- the sub-synchronizing signal and the ATIP synchronizing signal are locked by changing the frequency dividing ratio M of the second frequency dividing circuit.
- the present invention provides the system clock generating circuit, wherein the first PLL circuit includes A selection circuit is provided for selectively inputting any one of a pebble signal and a third reference clock signal.
- the invention is characterized in that in the system clock generation circuit, the first PLL circuit is configured as a PI type digital filter.
- the third output signal is divided and supplied to the pulse width modulation circuit so that the fluctuation of the carrier frequency of the pulse width modulation circuit within one cycle is minimized. It is characterized by doing.
- the present invention provides a system clock generation circuit that selects a reference clock signal near 203 MHz and divides the reference clock signal to obtain the first, second, and third reference clock signals.
- FIG. 1 is a diagram illustrating a data demodulation circuit for a wobble signal according to an embodiment of the present invention.
- a pulse width modulation (PWM) circuit 111 is employed without using a charge pump circuit, a phase error is obtained by the FPC 109, and a PWM circuit is obtained based on the phase error signal.
- PWM pulse width modulation
- the wobble signal WBL302 rotates at a constant rotation speed. Is supplied to the terminal.
- a reference signal 304 is input to the other terminal of the multiplexer 105, and the reference signal 304 in the range of 22 kHz to 53 kHz in which the range of the fob frequency fWBL in CAV driving at 1 ⁇ speed changes is input to the multiplexer 105. Supplied.
- the crystal oscillator 101 oscillates 33.8688 MHz, multiplies this by 6 in hexadecimal, oscillates a reference signal having a frequency of 203.2128 MHz (about 203 MHz), and divides 33.8688 MHz.
- the frequency is divided by the circuit 103 and used as a reference signal 304.
- the reference signal 304 and the wobble signal (WBL) 302 can be selectively switched by a selection signal 310 until the wobble signal WBL having a predetermined frequency is obtained from the optical disc.
- the reference signal 304 is selected, the system clock WPCLK is generated, and the multiplexer 105 is switched by the selection signal 310 at the stage when the cobble signal WBL is obtained, and the cobble signal WBL is selected.
- the output from the multiplexer 105 is input to the PLL circuit 107 and is locked in phase and frequency with the reference signal 306 obtained from the PLL circuit 107.
- the reference signal 306 can be supplied by dividing the above-mentioned signal of about 34 MHz.
- the output of the PLL 107 is supplied to one input of a frequency phase comparator (FPC) 109.
- FPC frequency phase comparator
- the PLL filter 200 can be configured as a PI digital filter. That is, it is composed of multipliers 201 and 203 having coefficients K0 and K1, power calculators 202 and 205, and a delay circuit 204.
- the PLL filter 200 gives a predetermined cutoff to the output from the FPC 109, and the cutoff frequency can be easily changed by changing the cases K0 and K1 of the multipliers 201 and 203.
- An output signal from the PLL filter 200 is input to the PWM circuit 111.
- the PWM circuit 111 generates a pulse wave having the reference clock signal 308 as a carrier frequency, and the pulse width of the noise wave is modulated by the signal from the PLL filter 200.
- a reference signal having a frequency of 25.4 MHz obtained by dividing the above-described approximately 203 MHz by 1/8 is used as reference signal 308.
- the output of the PWM circuit 111 is supplied to a low-pass filter 113 composed of R and C forces.
- the low-pass filter 113 applies a predetermined cutoff to the output of the PWM circuit 111, smoothes the output, and supplies a control voltage for the subsequent VCO 15.
- VC # 115 is configured to output an oscillation frequency with a frequency change of about 200MHz when the control voltage changes by 1 volt.
- the output from VC # 115 is frequency-divided by N (N is an integer) by frequency divider 117, further frequency-divided by M (M is an integer) by frequency divider 119, and fed back to FPC 109 for supply.
- FPC 109 compares the frequency and phase of the output signal of PLL 107 with the output signal of frequency divider 119, and outputs a signal based on the difference.
- the system clock signal WPCLK is output as a signal whose frequency and phase are locked with the enable signal WBL.
- the frequency division ratio N of the frequency divider 117 is selected from 1, 2, and 4 according to the rotation speed of the optical disk.
- the frequency division ratio M of frequency divider 119 is normally set to 686.
- Fig. 2 shows the sub-synchronization signal SUBsync output from the encoder of the CAV recording information and the ATIP synchronization signal ATIPsync obtained from the wobble signal WBL.
- the sub-synchronization signal rotates at 1x speed. Output a 75Hz synchronization signal when
- the ATIP synchronization signal is a signal read from the optical disk by the data demodulation circuit, and it is necessary to lock the leading edge within ⁇ 2 frames of the synchronization signal.
- the phase difference between the sub-synchronization signal 310 and the ATIP synchronization signal 312 is detected by the phase difference comparison circuit 121, and the frequency division ratio M of the frequency divider 119 is changed based on the detected value. By doing so, the sub synchronization signal is made to coincide with the ATIP synchronization signal.
- the system clock WPCLK thus created is used as a channel clock for CAV recording, but can also be used as a channel clock for constant linear velocity (CLV) recording.
- CLV constant linear velocity
- coefficient K0 of the multiplier 201 of the PLL filter 200 the trap gain of CAVPLL can be easily adjusted.
- coefficient K1 of multiplier 203 determines the cutoff frequency of PLL filter 200. Therefore, by properly selecting the coefficients K0 and K1, the stabilization of the PLL noise can be easily measured.
- the data for changing the pulse width of the carrier frequency of the PWM circuit 111 based on the output from the PLL filter 200 can be divided and supplied so as to minimize the fluctuation within one cycle of the carrier frequency. desirable. In this way, the division is made so that the fluctuation within one cycle is minimized. This is because, by supplying the power in this manner, the oscillation can be stably obtained without a large fluctuation of the control voltage applied to VC # 115.
- FIG. 3 is a diagram showing an example of a case where the output voltage of the PLL filter power is divided and applied to the PWM circuit 111.
- a PWM carrier decay rate of _60dB was obtained.
- the reference signal 308 be set as high as possible within the range of the driving frequency of the element.
- Fig. 4 shows the output waveform of the VCO 60, and it can be seen that the state has shifted to a stable state in a very short time (150 a s).
- the present invention has been described in detail based on the embodiment.
- the digital FPC in which the phase comparison circuit and the speed comparison circuit are integrated is adopted, the frequency control and the phase control are not performed. Can be performed simultaneously.
- the digital FPC can be easily configured with two JK flip-flops and a gate, and thus has an advantage that the circuit configuration is simplified.
- the PLL filter is configured by a digital PI filter, the cutoff frequency can be easily changed.
- the PWM circuit used in place of the charge pump circuit can be configured as a counter, and thus has an advantage that the circuit can be simplified.
- FIG. 1 A data demodulation circuit for a wobble signal according to an embodiment of the present invention.
- FIG. 3 is a diagram showing an example of a signal supplied to a PWM circuit.
- Garden 5 is a diagram showing a schematic configuration of a system clock generation circuit used for a data demodulation circuit of a wobble signal introduced in Patent Document 1 and the like.
- PWM Pulse width modulation
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
Description
Claims
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2004800430432A CN1961482A (zh) | 2004-05-26 | 2004-05-26 | 系统时钟发生电路 |
| PCT/JP2004/007196 WO2005117267A1 (ja) | 2004-05-26 | 2004-05-26 | システムクロック発生回路 |
| US11/597,768 US20080290916A1 (en) | 2004-05-26 | 2004-05-26 | System Clock Generation Circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2004/007196 WO2005117267A1 (ja) | 2004-05-26 | 2004-05-26 | システムクロック発生回路 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2005117267A1 true WO2005117267A1 (ja) | 2005-12-08 |
Family
ID=35451212
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2004/007196 Ceased WO2005117267A1 (ja) | 2004-05-26 | 2004-05-26 | システムクロック発生回路 |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US20080290916A1 (ja) |
| CN (1) | CN1961482A (ja) |
| WO (1) | WO2005117267A1 (ja) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7894564B2 (en) | 2006-11-07 | 2011-02-22 | Via Technologies, Inc. | Phase modulation method for spread spectrum clock generator |
| EP2173028A3 (de) * | 2008-10-01 | 2014-12-24 | Robert Bosch GmbH | Verfahren zur Regelung einer Grundfrequenz eines spannungsgesteuerten Oszillators als eine Trägerfrequenz eines frequenzmodulierten Signals |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101217042B (zh) * | 2008-01-18 | 2010-06-02 | 中国科学院上海光学精密机械研究所 | 红光高清光盘的时钟信号提取电路 |
| CN101710784B (zh) * | 2009-12-24 | 2011-09-07 | 浙江大学 | 极低压工作的电荷泵电路 |
| CN101841329A (zh) * | 2010-06-12 | 2010-09-22 | 中兴通讯股份有限公司 | 锁相环、压控装置及方法 |
| KR101901321B1 (ko) * | 2012-06-01 | 2018-09-21 | 삼성전자주식회사 | 클럭 발생기 및 클럭 발생 방법 |
| CN104571254B (zh) * | 2013-10-14 | 2016-06-15 | 技嘉科技股份有限公司 | 应用于高速总线装置的功率输出级控制系统的装置与方法 |
| CN104135210B (zh) * | 2014-06-27 | 2016-10-05 | 正频企业股份有限公司 | 全对称同步式弦波脉冲宽度调变方法及其应用的马达驱动系统 |
| US9431973B2 (en) * | 2014-09-08 | 2016-08-30 | Qualcomm Technologies International, Ltd. | Pulse-width modulation generator |
| CN105187061B (zh) * | 2015-08-28 | 2018-11-27 | 京信通信系统(中国)有限公司 | 晶振控制方法及其装置 |
| CN112152612B (zh) * | 2020-09-23 | 2024-09-17 | 中国第一汽车股份有限公司 | 一种控制信号同步的方法、装置、系统、车辆及存储介质 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1188128A (ja) * | 1997-09-02 | 1999-03-30 | Nec Corp | 信号生成方法および装置、電圧生成方法および装置 |
| JP2002094375A (ja) * | 2000-09-19 | 2002-03-29 | Nec Yamagata Ltd | Pll装置および該pll装置を有する光ディスク装置 |
| JP2004152361A (ja) * | 2002-10-29 | 2004-05-27 | Rohm Co Ltd | システムクロック発生回路 |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001127627A (ja) * | 1999-10-27 | 2001-05-11 | Nec Miyagi Ltd | Pll回路 |
| JP2002230915A (ja) * | 2001-02-05 | 2002-08-16 | Sanyo Electric Co Ltd | Pll回路 |
| JP2004265569A (ja) * | 2003-02-12 | 2004-09-24 | Sanyo Electric Co Ltd | Pll回路 |
| EP1458099B1 (en) * | 2003-03-14 | 2005-12-21 | STMicroelectronics S.r.l. | A phase-locked loop circuit with switched-capacitor conditioning of the control current |
-
2004
- 2004-05-26 CN CNA2004800430432A patent/CN1961482A/zh active Pending
- 2004-05-26 WO PCT/JP2004/007196 patent/WO2005117267A1/ja not_active Ceased
- 2004-05-26 US US11/597,768 patent/US20080290916A1/en not_active Abandoned
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1188128A (ja) * | 1997-09-02 | 1999-03-30 | Nec Corp | 信号生成方法および装置、電圧生成方法および装置 |
| JP2002094375A (ja) * | 2000-09-19 | 2002-03-29 | Nec Yamagata Ltd | Pll装置および該pll装置を有する光ディスク装置 |
| JP2004152361A (ja) * | 2002-10-29 | 2004-05-27 | Rohm Co Ltd | システムクロック発生回路 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7894564B2 (en) | 2006-11-07 | 2011-02-22 | Via Technologies, Inc. | Phase modulation method for spread spectrum clock generator |
| EP2173028A3 (de) * | 2008-10-01 | 2014-12-24 | Robert Bosch GmbH | Verfahren zur Regelung einer Grundfrequenz eines spannungsgesteuerten Oszillators als eine Trägerfrequenz eines frequenzmodulierten Signals |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1961482A (zh) | 2007-05-09 |
| US20080290916A1 (en) | 2008-11-27 |
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