WO2005083887A1 - Pll回路 - Google Patents
Pll回路 Download PDFInfo
- Publication number
- WO2005083887A1 WO2005083887A1 PCT/JP2005/002156 JP2005002156W WO2005083887A1 WO 2005083887 A1 WO2005083887 A1 WO 2005083887A1 JP 2005002156 W JP2005002156 W JP 2005002156W WO 2005083887 A1 WO2005083887 A1 WO 2005083887A1
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- Prior art keywords
- signal
- phase difference
- oscillation
- frequency
- difference signal
- Prior art date
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- 230000010355 oscillation Effects 0.000 claims description 66
- 238000001228 spectrum Methods 0.000 claims description 50
- 239000013256 coordination polymer Substances 0.000 description 11
- 238000010586 diagram Methods 0.000 description 11
- 230000000694 effects Effects 0.000 description 8
- 238000001514 detection method Methods 0.000 description 7
- 230000010365 information processing Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 230000002238 attenuated effect Effects 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
-
- 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
- H03L7/18—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop
Definitions
- the present invention relates to a PLL circuit using a spread spectrum technique.
- EMI refers to electromagnetic interference that causes peripheral equipment to malfunction due to radiated noise generated by electronic equipment.
- EMI noise As a main cause of EMI noise, a system clock signal generated in a voltage controlled oscillator (VCO) of a PLL (Phase Locked Loop) circuit is known.
- VCO voltage controlled oscillator
- PLL Phase Locked Loop
- FIG. 6 is a diagram showing a configuration of a PLL circuit employing a conventional spread spectrum technique (for example, see Patent Document 1). ⁇
- the conventional PLL circuit includes a reference frequency divider 610, a voltage controlled oscillator (hereinafter, VCO) 620, a comparison frequency divider 630, 631, a selector 632, a phase comparator 640, a charge pump 650, a low-pass filter ( Hereinafter, LPF) 660.
- VCO voltage controlled oscillator
- LPF low-pass filter
- the reference frequency divider 610 is a frequency divider that divides the frequency of the oscillation clock signal generated in the predetermined oscillation circuit and supplies the phase comparator 640 with the reference signal fr.
- the VCO 620 controls the oscillation frequency according to the applied voltage.
- the oscillation output fo of VCO620 is Usually, it is used as a system clock signal of an electronic device incorporating a PLL circuit.
- the comparison frequency divider 630 is a frequency divider used during a normal operation, and divides the oscillation output ⁇ of the VCO 620 according to a predetermined frequency division number (1ZN1) and supplies it to the selector 632.
- the frequency division number (1 / N1) of the comparative frequency divider 630 is set according to the frequency required as the oscillation output fo of the VCO 620 (hereinafter, reference frequency fl).
- the comparison frequency divider 631 is a frequency divider used when performing frequency modulation of the oscillation output fo of the VCO 620, and divides the oscillation output fo of the VCO 620 according to a predetermined frequency division number (1 / N2).
- the signal is supplied to the selector 632 around the circuit.
- the frequency division number (1ZN2) of the comparison frequency divider 631 is set according to the frequency after oscillation frequency modulation of the oscillation output fo of the VC0620 (hereinafter, spread frequency f2).
- the selector 632 selects either the output of the comparison frequency divider 630 or the output of the comparison frequency divider 631 based on the switching signal SEL, and supplies the comparison signal fv to the phase comparator 640. It is.
- the phase comparator 640 compares the phase of the comparison signal fv supplied from the selector 632 with the phase of the reference signal fr.
- selector 632 selects the output of the comparison frequency divider 630.
- phase comparator 640 supplies phase difference signal ⁇ : corresponding to the phase difference to charge pump 650. Conversely, when the phase of the reference signal fr lags behind the phase of the comparison signal fv, a phase difference signal ⁇ V corresponding to the phase difference is supplied to the charge pump 650.
- the charge pump 650 supplies the LPF 660 with a voltage signal CP having a level corresponding to the phase difference signals ⁇ : and ⁇ .
- the LPF 660 removes the harmonic component from the voltage signal CP and supplies a DC voltage Vr obtained by converting the voltage signal CP into a DC to the VCO 620.
- the VCO 620 acts to increase the oscillation frequency and advance the phase of the comparison signal fv.
- the DC voltage Vr corresponding to the phase difference signal ⁇ acts to lower the oscillation frequency and delay the phase of the comparison signal fv.
- the oscillation frequency of the oscillation output fo of the VCO 620 is locked (locked) to the reference frequency fl.
- the power spectrum associated with the oscillation frequency of the output fo of the VCO 620 usually has a peak at the reference frequency fl in the phase locked state. Therefore, the PLL circuit modulates the oscillation frequency of the oscillation output fo of the VCO 620 to spread the power spectrum at the reference frequency fl.
- the output of the comparison frequency divider 631 is selected by the selector 632, and the phase lock state is temporarily released. Then, the PLL circuit performs similar PLL control so that the phase of the reference signal fr and the phase of the output of the comparison frequency divider 631 are locked. As a result, the oscillation frequency of the oscillation output fo of the VCO 620 is temporarily shifted from the reference frequency fl to an unstable state (unlocked state), but is eventually locked to the spread frequency f2. State.
- the power spectrum of the oscillation output fo of the VCO 620 becomes the bandwidth (spectrum width) between the reference frequency fl and the spread frequency f2 that is not concentrated on the reference frequency fl. Since the state is spread, the peak level of the power vector at the reference frequency fl is attenuated. Therefore, EMI noise based on the oscillation output fo of VCO620 is reduced.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2001-7700
- a main aspect of the present invention for solving the above-mentioned problem is to provide an oscillation circuit for generating an oscillation signal having an oscillation frequency based on a supply voltage, and for generating the oscillation signal based on a predetermined frequency division number.
- a frequency divider for generating a comparison signal obtained by dividing the frequency of the reference signal, a phase comparator for generating a phase difference signal between the generated comparison signal and the reference signal, and a voltage signal obtained by converting the generated phase difference signal into a direct current.
- a control for switching at a predetermined timing the validity Z invalidity of the phase difference signal supplied to the low-pass filter from the phase comparator card and supplied to the low-pass filter.
- the predetermined potential is supplied to the low-pass filter via the resistance element, and the voltage signal generated in accordance with the supplied predetermined potential is applied to the voltage signal. Then, the oscillation circuit is caused to oscillate.
- FIG. 1 is a schematic configuration diagram of a system equipped with a PLL circuit according to an embodiment of the present invention.
- FIG. 2 is a configuration diagram of a PLL circuit according to an embodiment of the present invention.
- FIG. 3 is a timing chart illustrating an operation of a PLL circuit according to one embodiment of the present invention.
- FIG. 4 is a diagram showing a power spectrum waveform according to a resistance value according to one embodiment of the present invention.
- FIG. 5 is a diagram showing a power spectrum waveform according to a reset period according to an embodiment of the present invention.
- FIG. 6 is a configuration diagram of a conventional PLL circuit.
- FIG. 7 is a diagram showing a conventional power spectrum waveform.
- FIG. 1 is a system configuration diagram of an information processing apparatus equipped with a PLL circuit according to an embodiment of the present invention.
- the information processing device is an electronic device equipped with the PLL circuit according to the present invention, such as a television receiver, an FM receiver, and a mobile communication device.
- the information processing apparatus is equipped with a CPU 300 for controlling the entire system and a DSP (Digital Signal Processor) 400 for performing predetermined digital signal processing.
- the PLL circuit 100 is provided for synchronizing the CPU 300 and the DSP 400, and supplies a system clock signal SCLK, which is an oscillation output of a voltage controlled oscillator (hereinafter, VCO) 20, to the CPU 300 and the DSP 400. Supply.
- SCLK is an oscillation output of a voltage controlled oscillator (hereinafter, VCO) 20, to the CPU 300 and the DSP 400. Supply.
- the information processing apparatus is designed to reduce the EMI noise generated in the PLL circuit 100, such as the switching noise of circuit elements based on the system clock signal SCLK output from the VCO 20.
- EMI noise generated in the PLL circuit 100 such as the switching noise of circuit elements based on the system clock signal SCLK output from the VCO 20.
- a lock detection unit 200 and a counter 210 are provided.
- the lock detector 200 generates a phase difference signal (a phase difference signal) indicating the result of the phase comparison in the phase comparator 40. Based on ⁇ , ⁇ ), it is detected whether or not the PLL circuit 100 is in a phase locked state. When a phase lock state is detected, a lock detection signal is supplied to the counter 210.
- the counter 210 When a lock detection signal is supplied from the lock detection unit 200, the counter 210 resets the count value and starts a counter operation based on a predetermined clock signal. At this time, the counter 210 supplies a reset signal CX for invalidating the phase difference signal to the phase comparator 40.
- the reset signal CX is valid until the counter 210 counts a predetermined number, and the reset signal CX is released when the counter 210 counts.
- the time from when the reset signal CX is supplied to the phase comparator 40 until the reset signal CX is released is referred to as “reset time”.
- the PLL circuit 100 When the reset signal CX is supplied to the phase comparator 40, the PLL circuit 100 performs the frequency modulation described below according to the present invention, and the oscillation frequency of the VCO 20 fluctuates. Then, after the reset signal CX is released, the phase lock state is established again, and the lock detection unit 200 supplies the counter 210 with a lock detection signal for resetting the count value in the counter 210 and restarting the count operation. You do it.
- the PLL circuit 100 includes a reference frequency divider 10, a voltage controlled oscillator (hereinafter, VCO) 20, a comparison frequency divider 30, a phase comparator 40, a charge pump 50, a low-pass filter (hereinafter, LPF) 60, , A pull-up resistor 70. Note that the PLL circuit 100 is usually integrated except for the LPF 60, and the LPF 60 is externally attached.
- VCO voltage controlled oscillator
- LPF low-pass filter
- the reference frequency divider 10 is a frequency divider for dividing an oscillation clock signal (hereinafter, oscillation CLK) according to a predetermined frequency division number and supplying a reference signal fr to the phase comparator 40.
- the oscillation CLK may be supplied by self-excited oscillation in an oscillation circuit such as a crystal oscillator, or may be supplied externally. It may be supplied by another excitation from the unit! ⁇ .
- the VCO 20 controls the oscillation frequency in accordance with the level of the applied voltage and the application time. Usually, a variable capacitance diode whose capacitance changes according to a bias voltage is employed.
- the oscillation output fo of the VCO 20 is used as the system clock signal SCLK of the information processing device.
- the comparison frequency divider 30 is a frequency divider for dividing the oscillation output fo of the VCO 20 according to a predetermined frequency division number (1ZN1) and supplying the phase comparator 40 with a comparison signal fv.
- the frequency division number (1ZN1) of the comparison frequency divider 30 is set according to the oscillation frequency (hereinafter, reference frequency f1) required as the oscillation output fo of the VCO 20.
- reference frequency f1 the oscillation frequency required as the oscillation output fo of the VCO 20.
- comparison frequency divider 30 may be a fixed frequency divider that fixes the frequency division number, or may be a programmable frequency divider that can arbitrarily set the frequency division number.
- phase comparator 40 compares the phase of the reference signal fr with the phase of the comparison signal fv.
- phase comparator 40 When the phase of the reference signal fr leads the phase of the comparison signal fv (see the period Ta in FIGS. 3A and 3B), the phase comparator 40 outputs a phase difference signal ⁇ according to the phase difference. : (See period Ta in FIG. 3 (c)) to the charge pump 50. Conversely, when the phase of the reference signal fr lags behind the phase of the comparison signal fv (see the period Tb in FIGS. 3A and 3B), the phase difference signal ⁇ (FIG. d) (see period Tb) to the charge pump 50. That is, during normal operation, the phase difference signals ⁇ :, ⁇ are effective.
- the charge pump 50 is configured by, for example, connecting a PMOSFET and an NMOSFET in series between a power supply voltage VCC and a ground GND.
- the inverted signal of the phase difference signal ⁇ is supplied to the gate electrode of the PMOSFET, and the phase difference signal ⁇ is supplied to the gate electrode of the NMOSFET.
- the voltage signal CP generated at the connection point between the PMOSFET and the NMOSFET is supplied to the LPF 60.
- the charge pump 50 turns off both the PMOSFET and the NMOSFET, and the output (the connection point between the PMOSFET and the NMOS SFET) shows high impedance.
- phase difference signal ⁇ When the phase difference signal ⁇ is at the H level and the phase difference signal ⁇ is at the L level, the PMOSF ON is turned on and the NMOSFET is turned off, and the voltage signal CP corresponding to the power supply voltage VCC is output. Output (see period Ta in Fig. 3 (e)).
- the phase difference signal ⁇ : is at L level and the phase difference signal ⁇ is at ⁇ level, the PMOSFET is turned off and the NMOSFET is turned on, and the voltage signal CP corresponding to the ground GND is output (period Tb in FIG. 3 (e)). See).
- the LPF 60 When the phase difference signals ⁇ and ⁇ are valid, the LPF 60 is supplied with a voltage signal CP based on the phase difference signals ⁇ and ⁇ from the charge pump 50. Then, the LPF 60 removes harmonic components from the supplied voltage signal CP, and supplies a DC voltage Vc obtained by converting the voltage signal CP into a DC to the VCO 20.
- the VCO 20 acts to increase the oscillation frequency to advance the phase of the comparison signal fv. Conversely, when the DC voltage Vcp according to the phase difference signal ⁇ is supplied, the oscillation frequency lowers to delay the phase of the comparison signal fv. As a result, finally, no phase difference occurs between the reference signal fr and the comparison signal fv, and the oscillation frequency of the VCO 20 is locked to the reference frequency fl (phase locked state).
- the phase comparator 40 has a reset processing section 41 (“control section”).
- the reset processing unit 41 validates the phase difference signals ⁇ and ⁇ during normal operation, and invalidates the phase difference signals ⁇ and ⁇ when the reset signal CX is supplied to the phase comparator 40. is there.
- the invalidity of the phase difference signals ⁇ and ⁇ means that the levels of the phase difference signals ⁇ and ⁇ are forcibly converted to a level (L level) for making the output of the charge pump 50 a noisy impedance.
- the reset processing unit 41 may be provided outside the phase comparator 40.
- the pull-up resistor 70 provided between the signal line for supplying the voltage signal CP from the charge pump 50 to the LPF 60 and the pull-up voltage VCC causes the pull-up to occur.
- the up voltage VCC (when the voltage drop of the pull-up resistor 70 is ignored) is supplied to the LPF60.
- the LPF 60 similarly removes harmonic components from the pull-up voltage VCC and supplies a DC voltage Vpu obtained by converting the pull-up voltage VCC into a DC to the VCO 20.
- the VCO 20 waits for the supply of the DC voltage Vpu until the reset signal CX is released based on the counter 210, that is, the lapse of the reset time. Acts to increase the oscillating frequency according to. Thereafter, when the reset signal CX is released, the phase difference signals ⁇ ⁇ and ⁇ are again enabled by the reset processing unit 41, and the VCO 20 receives a DC signal corresponding to the phase difference signal ⁇ r or the phase difference signal ⁇ V. The voltage Vcp is supplied. Then, the above-described ordinary PLL operation for locking the oscillation frequency of the VCO 20 to the reference frequency fl is performed.
- the power spectrum of the oscillation output fo of the VCO 20 becomes higher than the reference frequency fl which is not concentrated in the reference frequency fl. Since the state is spread in the direction, the peak level of the power spectrum at the reference frequency fl is attenuated. Therefore, EMI noise based on the oscillation output of VCO20 is reduced.
- the oscillation frequency of the output fo of the VCO 20 keeps increasing as the reset time elapses. Therefore, unlike the conventional case, the power spectrum does not concentrate on a specific frequency (spread frequency) after frequency modulation. Therefore,
- FIG. 4 is a diagram for explaining a change in the power spectrum waveform according to the resistance value of the pull-up resistor 70 when the reset time is constant.
- the power spectrum is the degree to which each frequency component of a signal appears on the time axis (power) expressed by the frequency axis versus the power axis.
- the power spectrum level is obtained by expanding the Fourier series based on the sampling data of the signal level on the time axis and obtaining the magnitude of the Fourier coefficients (coefficients of Si n and Cos) at that time.
- the power spectrum waveform shown by the solid line in FIG. 4 is a case where the PLL circuit 100 performs a normal PLL operation. Oscillation frequency of VCO20 becomes reference frequency fl by PLL operation Because of the concentration, the power spectrum has a peak level at the reference frequency fl.
- the power spectrum waveforms indicated by the dashed line, the dashed-dotted line, and the dashed-dotted line change the oscillation frequency (reference frequency f1) of the VCO 20 when the phase is locked based on the reset signal CX. Is the case. It is to be noted that the resistance value of the pull-up resistor 70 decreases under the condition that the reset time is constant and V in the order of the broken line, the one-dot chain line, and the two-dot chain line.
- the peak level of the power spectrum during frequency modulation is attenuated from the peak level of the power spectrum during normal operation of the PLL regardless of the resistance value of the pull-up resistor 70. Since the reset time is constant, the attenuation of the peak level of the power spectrum does not change due to the change in the resistance value of the pull-up resistor 70! ,.
- the resistance value of the pull-up resistor 70 when the resistance value of the pull-up resistor 70 is small, the voltage drop at the pull-up resistor 70 is reduced as compared with the case where the resistance value of the pull-up resistor 70 is large.
- the level of the DC voltage Vpu increases. Therefore, by changing the oscillation frequency of the VCO 20 toward the high frequency direction, the spectrum width is expanded, and the power spectrum is further spread.
- the effect of spreading the power spectrum can be further improved.
- FIG. 5 is a diagram illustrating a change in the power spectrum waveform according to the length of the reset time when the resistance value of the pull-up resistor 70 is constant.
- the power spectrum waveform shown by the solid line in FIG. 5 is a case where the PLL circuit 100 performs a normal PLL operation. Since the oscillation frequency of the VCO 20 is concentrated on the reference frequency fl by the PLL operation, the power spectrum has a peak level at the reference frequency fl.
- the power spectrum waveforms indicated by the dashed line, the dashed-dotted line, and the dashed-dotted line are obtained when the oscillation frequency (reference frequency f 1) of the VCO 20 during phase lock is modulated based on the reset signal CX. It is. Note that the reset time is extended under the condition that the resistance value of the pull-up resistor 70 is constant in the order of the broken line, the one-dot chain line, and the two-dot chain line. As shown in FIG. 5, the peak level of the power spectrum during frequency modulation is attenuated more than the peak level of the power spectrum during normal operation of the PLL.
- the reset time becomes longer, the time required to separate from the reference frequency fl becomes longer, and the attenuation of the peak level of the power spectrum becomes larger. Furthermore, as the reset time becomes longer, the oscillation frequency of the VCO 20 changes to a higher frequency, so that the spectrum width is expanded and the power spectrum is spread more.
- the length of the reset time is set in accordance with the degree of attenuating the peak level of the power spectrum and the degree of spreading of the power spectrum, thereby further improving the effect of spreading the power spectrum. be able to.
- the resistance value of the pull-up resistor 70 is set to an appropriate value in combination with the setting of the reset time length, it is needless to say that the effect of spreading the power vector is further improved.
- the charge pump 50 may not be provided due to the configuration of the PLL circuit.
- the output stage of the phase comparator 40 is provided with a series-connected PMOSFET and NMOSFET similar to the charge pump 50, and outputs a phase difference signal corresponding to the above-described voltage signal CP.
- the reset processing unit 41 turns off both the PMOSFET and the NMOS FET at the output stage of the phase comparator 40, and makes the output level of the phase comparator 40 high impedance. Control will be performed.
- a pull-down resistor provided between the signal line between the charge pump 50 and the LPF 60 and the ground GND, which is different from the pull-up resistor 70, may of course be employed.
- the oscillation frequency (reference frequency fl) of the VCO 20 during phase lock is frequency-modulated based on the reset signal CX, the level of the DC voltage Vpu supplied to the VCO 20 becomes L level. Therefore, the oscillation frequency of the VCO 20 changes in the direction of the low frequency, and the same effect of spreading the power spectrum as in the case of the pull-up resistor 70 can be obtained.
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- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/590,644 US8031015B2 (en) | 2004-02-27 | 2005-02-14 | Phase-locked loop circuit |
KR1020067017258A KR101110689B1 (ko) | 2004-02-27 | 2005-02-14 | Pll 회로 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2004055280A JP4063779B2 (ja) | 2004-02-27 | 2004-02-27 | Pll回路 |
JP2004-055280 | 2004-02-27 |
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WO2005083887A1 true WO2005083887A1 (ja) | 2005-09-09 |
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Family Applications (1)
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PCT/JP2005/002156 WO2005083887A1 (ja) | 2004-02-27 | 2005-02-14 | Pll回路 |
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US (1) | US8031015B2 (ja) |
JP (1) | JP4063779B2 (ja) |
KR (1) | KR101110689B1 (ja) |
CN (1) | CN100563109C (ja) |
WO (1) | WO2005083887A1 (ja) |
Families Citing this family (8)
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KR20100077548A (ko) * | 2008-12-29 | 2010-07-08 | 주식회사 동부하이텍 | 위상동기회로 |
KR101950320B1 (ko) * | 2012-06-29 | 2019-02-20 | 에스케이하이닉스 주식회사 | 위상 검출 회로 및 이를 이용한 동기 회로 |
KR102087235B1 (ko) * | 2013-09-24 | 2020-03-11 | 에스케이하이닉스 주식회사 | 위상 감지 장치 및 위상 감지 방법 |
KR101550530B1 (ko) * | 2014-03-14 | 2015-09-08 | 성균관대학교산학협력단 | 디지털 지연 고정 루프를 이용하여 전자기 간섭을 줄일 수 있는 동기식 직류-직류 벅 변환기 및 스위칭 신호들의 파형 제어 방법 |
CN104641578B (zh) * | 2014-11-25 | 2017-05-10 | 索尔思光电(成都)有限公司 | 直流电平检测电路,包含该电路的系统和制造、使用方法 |
KR101589514B1 (ko) * | 2015-06-16 | 2016-02-01 | 성균관대학교산학협력단 | 디지털 지연 고정 루프를 이용하여 전자기 간섭을 줄일 수 있는 동기식 직류-직류 벅 변환기 및 스위칭 신호들의 파형 제어 방법 |
CN105207669A (zh) * | 2015-08-19 | 2015-12-30 | 深圳市海能达通信有限公司 | 一种减小频率源锁定时间的方法及电路 |
US11152974B2 (en) * | 2018-10-31 | 2021-10-19 | Samsung Electronics Co., Ltd. | Wireless communication apparatus and method |
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JP2000101424A (ja) * | 1998-09-18 | 2000-04-07 | Sony Corp | クロック発生回路 |
JP2000252817A (ja) * | 1999-03-03 | 2000-09-14 | Kawasaki Steel Corp | Pll回路 |
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DE3471567D1 (en) * | 1984-11-02 | 1988-06-30 | Itt Ind Gmbh Deutsche | Colour television receiver comprising at least one integrated circuit for processing the composite digital colour signal |
US4937536A (en) | 1988-08-19 | 1990-06-26 | Hughes Aircraft Company | Fast settling phase lock loop |
JP2947192B2 (ja) * | 1996-12-05 | 1999-09-13 | 日本電気株式会社 | Pll回路 |
JP3313998B2 (ja) | 1997-03-17 | 2002-08-12 | 日本プレシジョン・サーキッツ株式会社 | 位相同期回路 |
US6157271A (en) * | 1998-11-23 | 2000-12-05 | Motorola, Inc. | Rapid tuning, low distortion digital direct modulation phase locked loop and method therefor |
JP3434734B2 (ja) | 1999-06-22 | 2003-08-11 | エヌイーシーマイクロシステム株式会社 | Pll回路 |
JP4551776B2 (ja) * | 2005-01-17 | 2010-09-29 | 日本圧着端子製造株式会社 | 両面fpc |
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- 2004-02-27 JP JP2004055280A patent/JP4063779B2/ja not_active Expired - Fee Related
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2005
- 2005-02-14 KR KR1020067017258A patent/KR101110689B1/ko not_active IP Right Cessation
- 2005-02-14 CN CNB2005800060389A patent/CN100563109C/zh not_active Expired - Fee Related
- 2005-02-14 WO PCT/JP2005/002156 patent/WO2005083887A1/ja active Application Filing
- 2005-02-14 US US10/590,644 patent/US8031015B2/en active Active
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JP2000101424A (ja) * | 1998-09-18 | 2000-04-07 | Sony Corp | クロック発生回路 |
JP2000252817A (ja) * | 1999-03-03 | 2000-09-14 | Kawasaki Steel Corp | Pll回路 |
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US8031015B2 (en) | 2011-10-04 |
KR20060131855A (ko) | 2006-12-20 |
US20080278248A1 (en) | 2008-11-13 |
CN1922787A (zh) | 2007-02-28 |
CN100563109C (zh) | 2009-11-25 |
JP2005244876A (ja) | 2005-09-08 |
KR101110689B1 (ko) | 2012-02-24 |
JP4063779B2 (ja) | 2008-03-19 |
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