WO2004088913A1 - 位相比較回路及びクロックリカバリ回路 - Google Patents
位相比較回路及びクロックリカバリ回路 Download PDFInfo
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- WO2004088913A1 WO2004088913A1 PCT/JP2003/004118 JP0304118W WO2004088913A1 WO 2004088913 A1 WO2004088913 A1 WO 2004088913A1 JP 0304118 W JP0304118 W JP 0304118W WO 2004088913 A1 WO2004088913 A1 WO 2004088913A1
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- 238000011084 recovery Methods 0.000 title claims description 42
- 238000001514 detection method Methods 0.000 claims abstract description 25
- 230000000630 rising effect Effects 0.000 claims description 13
- 230000010355 oscillation Effects 0.000 claims description 5
- 230000001360 synchronised effect Effects 0.000 claims description 4
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 description 27
- 238000010586 diagram Methods 0.000 description 15
- 238000004891 communication Methods 0.000 description 10
- 230000005540 biological transmission Effects 0.000 description 6
- 238000012937 correction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
-
- 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
- H03L7/087—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal using at least two phase detectors or a frequency and phase detector 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
- H03L7/08—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
- H03L7/091—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal the phase or frequency detector using a sampling device
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/06—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection
- H04L25/061—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection providing hard decisions only; arrangements for tracking or suppressing unwanted low frequency components, e.g. removal of dc offset
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/02—Speed or phase control by the received code signals, the signals containing no special synchronisation information
- H04L7/033—Speed or phase control by the received code signals, the signals containing no special synchronisation information using the transitions of the received signal to control the phase of the synchronising-signal-generating means, e.g. using a phase-locked loop
Definitions
- the present invention relates to a phase comparison circuit used in a clock recovery circuit and a clock recovery circuit, and more particularly, to a phase comparison circuit having a stable phase with respect to a data signal even when the SN ratio of an input data signal is poor.
- BACKGROUND OF THE INVENTION 1 Field of the Invention The present invention relates to a clock force variator circuit capable of extracting a click signal and a phase comparison circuit thereof. Background art
- a signal having a high SN ratio that does not cause a code error in transmitted data is input to an optical receiving circuit.
- high-speed optical communication systems using error-correcting codes have been developed with the aim of increasing the transmission distance and further improving the transmission speed.
- a signal having a poor SN ratio that may cause a code error may be input to the optical receiving circuit.
- the output signal from the optical receiving circuit is incorrect. In this case, the error is corrected by the code error correction circuit connected at the subsequent stage, and transmission with error free becomes possible.
- the clock recovery circuit extracts the clock signal from the input data signal, and the identification circuit identifies the data signal based on the extracted clock signal.
- this clock signal extraction there is no merit due to the use of the error correction code, and it is required to operate under more severe conditions such as a poor SN ratio of the input signal.
- Fig. 1 shows an example of the configuration of a conventional PLL-based clock recovery circuit 1 and identification circuit 2.
- the clock recovery circuit compares the phases of the data signal and the peak signal, and outputs a signal corresponding to the phase difference, and smoothes the signal corresponding to the phase difference.
- a control-type transmission circuit 5 VCO for generating a clock signal having a frequency corresponding to the output of the loop filter 4. I do.
- the clock recovery circuit 1 operates to advance the phase of the clock signal if the phase of the clock signal lags behind the phase of the data signal. It operates to delay the phase of the clock signal.
- the phase of the output signal of the clock recovery circuit 1 accurately follows the phase of the input data signal by the above operation. It is desirable.
- the phase difference between the data signal and the clock signal is normally detected by the phase comparison circuit 3 and the clock signal is adjusted so that the phase between the two coincides. Is controlled normally.
- phase comparison circuit 3 detects a component obtained by converting this noise into phase noise. As a result, the phase of the clock signal is excessively controlled, which may cause problems such as increased identification code errors, increased jitter of the clock signal, and loss of PLL synchronization.
- the conventional technology has a problem that not only the phase noise component of the data signal but also the noise component in the amplitude direction is detected as phase noise.
- the phase difference between the data signal and the clock signal is equal to the earth ⁇ ( ⁇ / 2 in time, ⁇ is one time slot.
- the information unit transmitted in the time of ⁇ is 1 Within this range, the phase of the clock signal is controlled to the optimum phase at which the phase difference becomes zero, and the PLL circuit is kept synchronized.
- the prior art relating to the clock recovery circuit includes the technology described in the following document.
- Patent Document 1 Japanese Patent Laid-Open No. 5-198081
- Patent Document 2
- the present invention provides a phase comparison circuit capable of removing noise in the amplitude direction, which is a problem of the related art, and also provides a clock recovery that is unlikely to lose synchronization even when excessive phase noise is detected.
- An object of the present invention is to provide an optical receiver circuit that can stably extract a peak signal even under conditions where the SN ratio of an input data signal is poor by providing a Paris circuit.
- An object of the present invention is to provide a phase comparison circuit that outputs a phase difference signal indicating a phase difference between a data signal and a clock signal by detecting a phase of a data signal using a plurality of different m3 ⁇ 4u levels and responding to the plurality of identification levels.
- a detection unit that outputs a plurality of signals indicating the detected phases
- a phase comparison unit that outputs a plurality of phase difference signals indicating a phase difference between each of the plurality of signals output from the detection unit and the clock signal
- a control unit that controls whether to output or not output one of the plurality of phase difference signals by using all or a part of the plurality of phase difference signals output from the phase comparison unit. This can be achieved by configuring as follows.
- the rising or falling shape of the data signal can be determined by using all or a part of the plurality of phase difference signals output from the phase comparison unit. By outputting one phase difference signal when the rise or fall is steep, the influence of noise in the amplitude direction can be removed.
- an object of the present invention is to provide a clock recovery circuit having a PLL circuit having a phase comparison circuit, a filter, and a voltage-controlled oscillation circuit, by using a pattern included in an input data signal, A signal generation circuit that detects a phase difference exceeding ⁇ ⁇ from a clock signal output from the controlled oscillation circuit and generates a signal corresponding to the phase difference, and converts the signal into an output signal from the phase comparison circuit.
- a signal generation circuit that detects a phase difference exceeding ⁇ ⁇ from a clock signal output from the controlled oscillation circuit and generates a signal corresponding to the phase difference, and converts the signal into an output signal from the phase comparison circuit.
- the phase of the clock signal can be controlled so as to correct the phase difference without causing a cycle slip.
- FIG. 1 is a configuration diagram of a conventional clock recovery circuit and an identification circuit using a PLL circuit.
- FIG. 2 is a configuration diagram for explaining the principle of the phase comparison circuit in the first to fourth embodiments.
- FIG. 3 is a diagram for explaining how noise in the amplitude direction affects the detection phase of an input data signal.
- FIG. 4 is a diagram for explaining a method of detecting a rising edge shape (when a data signal has a steep rising edge).
- FIG. 5 is a diagram for explaining a method of detecting the rising shape of the edge (when the rising of the data signal is gentle).
- FIG. 6 is a configuration diagram of the phase comparison circuit in the first embodiment.
- FIG. 7 is a configuration diagram of the phase comparison circuit in the second embodiment.
- FIG. 8 is a configuration diagram of the phase comparison circuit in the third embodiment.
- FIG. 9 is a configuration diagram of the phase comparison circuit in the fourth embodiment.
- FIG. 10 is a diagram illustrating characteristics of the Hogge type phase comparator.
- FIG. 11 is a timing chart for explaining the operation of the phase comparison circuit in the fourth embodiment.
- FIG. 12 is a configuration diagram of the clock recovery circuit in the fifth embodiment.
- FIG. 13 is a timing chart for explaining the operation of the clock recovery circuit in the fourth embodiment.
- FIG. 14 is a diagram showing characteristics of each signal.
- FIG. 15 is an example of a clock recovery circuit to which the phase comparison circuit according to the embodiment of the present invention is applied.
- FIG. 16 shows a case where the phase comparison circuit or the clock recovery circuit according to the embodiment of the present invention is used.
- 1 is an overall configuration diagram of an optical communication system having an optical receiving circuit to be used.
- the first to fourth embodiments relate to a phase comparison circuit in a clock recovery circuit capable of removing noise in the amplitude direction.
- the fifth embodiment relates to a cycle comparator even when a large phase difference occurs.
- This is an embodiment of a clock recovery circuit capable of controlling the phase without causing a lip.
- the sixth embodiment is an embodiment of an optical communication system using the above-described phase comparison circuit and clock recovery circuit.
- FIG. 2 is a configuration diagram of a phase comparison circuit for explaining the principle.
- This phase comparison circuit is used, for example, as the phase comparison circuit 3 in a clock recovery circuit as shown in FIG.
- Phase comparison circuit shown in FIG. 2 a plurality of amplifiers 1 ( ⁇ ⁇ ! ⁇ O n and compares the phases of the signal and the clock signal from the amplifier, the phase comparison circuit 1 1 for outputting a signal indicating a phase difference and I ⁇ ll n, the control circuit 1 2 for determining the effect of the amplitude direction of the noise, holds the signal from the phase ratio ⁇ path 1 0 i, which have a sample and hold circuit 1 3 to be output.
- the operation of the phase comparator will be described below.
- Input data signal is branched, the amplifier 1 ( ⁇ ⁇ 1 o n is input to.
- Amplifier 1 0 i ⁇ 1 0 n have different discrimination level 1 !! respectively, are amplified by respective identification level identified data signal can be considered as having a phase information at the time the data signal crosses the discrimination level.
- each amplifier 1 ( ⁇ ⁇ o n outputs a signal corresponding to the phase.
- these one of the output signal by a phase difference of the signals output from the amplifier is detected by the phase comparison circuit 1 1 ⁇ 1 1 n, the rising and falling edges of the shape of the data signal (or a large inclination smaller That is, the time during which the voltage of the data signal changes by the width between the predetermined identification levels is detected as short or long.
- phase difference signal from the phase comparison circuit 11 input to the sample and hold circuit 13 is not output at that time. If the influence of noise in the direction is small, the phase ⁇ (sign from the phase comparator 1 input to the sample and hold circuit 13 is output.
- FIGS. These figures explain the case of three amplifiers as an example.
- FIG. 3 is a diagram for explaining how noise in the amplitude direction affects the detection phase of an input data signal.
- (A) shows a case where the rising of the edge of the data signal is steep, and (b) shows a case where the rising of the edge of the data signal is gentle.
- the phase of the data signal is set at a certain discrimination level, and is detected as the phase when the level of the data signal crosses the discrimination level.
- the phase of the data signal does not actually change, but when there is noise in the amplitude direction, the phase when no noise is present Is changed. And, it seems that the phase gradually changes due to the noise in the amplitude direction as the rise becomes gentler.
- the phase comparison circuit shown in FIG. 2 is configured.
- phase comparison circuit shown in FIG. 2 detects whether the rising edge of the data signal is slow or strong.
- Fig. 4 shows an example where the rise of the data signal is steep
- Fig. 5 shows an example where the rise of the data signal is gradual
- the phase when the data signal crosses the discrimination level 1 is A
- the phase when the data signal crosses the discrimination level 2 is B
- the data signal is the discrimination level.
- the phase difference between A and the clock signal at the discrimination level 1 is phase difference 1
- the phase difference between B and the clock signal at the discrimination level 2 is phase difference 2
- the discrimination level 3 The phase between C and the clock signal The difference is phase difference 3.
- phase difference 3 and phase difference 2 are larger in FIG. 5 than in FIG. This is because the edge of the data signal rises more slowly in the case of FIG.
- a signal with phase difference 2 and phase difference 3 is input to the control circuit 12 and a reference value having a difference between phase difference 2 and phase difference 3 If it is larger, the signal of phase difference 1 is not output from the sample and hold circuit 13, and if it is smaller than a certain reference value, it is output.
- FIGS. 4 and 5 correspond to the case where three amplifiers and three phase comparators are used in the phase comparator of FIG. 2 respectively.
- the edge shape can be detected more accurately.
- FIG. 6 shows the configuration of the phase comparison circuit in the first embodiment.
- Phase comparing circuit in the first embodiment the amplifier 2 0 i to 2 0 3, the phase comparator 2 12 1 3 for comparing the phase of the signal and the click-locking signal from the amplifier, a phase comparator
- the circuit 22 for calculating the difference between the phase difference ⁇ 2 from the circuit 2 12 and the phase difference ⁇ 3 from the phase comparison circuit 2 13, and the reference value ⁇ ⁇ and the output value from the circuit 22 It has a comparator 23 for comparison and a sample-and-hold circuit 24 for holding and outputting a signal from the phase comparison circuit 21. Note that the circuit 22 and the comparator 23 correspond to the control circuit 12 shown in FIG.
- the discrimination level Vth is given to the amplifier 200
- the level Vth + dy is given to the amplifier 202
- the decision level Vth—dV is given to the amplifier 203.
- Tatsusho comparison circuit and the phase of the detected data signal by using each decision level, compares the phases of the clock signal, the phase comparator 2 1 2 of the output [Phi 2 and the phase comparator circuit 2 1 3
- Output Comparator 23 compares the difference from ⁇ 3 with ⁇ . If the difference is ⁇ min or less, the phase ratio is added to sample and hold circuit 24. Instruct to output the output ⁇ ⁇ of the comparison circuit 2! L ⁇ , and instruct it to keep ⁇ ⁇ ⁇ if it is more than ⁇ . Thereby, the influence of noise in the amplitude direction can be reduced.
- FIG. 7 shows the configuration of the phase comparison circuit in the second embodiment.
- Phase comparison circuit in the second embodiment the amplifier 3 C ⁇ S 0 2, a phase comparator 3 1-3 1 2 for comparing the phase of the signal and the click-locking signal from the amplifier, a phase comparator circuit 3 Compare the circuit 32 that calculates the difference between the phase difference ⁇ 1 from i and the phase difference circuit 2 from the phase comparison circuit 3 1 2 with the reference value ⁇ ⁇ and the output value from the circuit 3 2 And a sample-and-hold circuit 34 for holding and outputting a signal from the phase comparison circuit 31.
- the circuit 32 and the comparator 33 correspond to the control circuit 12 shown in FIG.
- the amplifier 3 is given discrimination level V th
- the amplifier 3 0 2 are given discrimination level V th + d V.
- Each phase comparator compares the phase of the data signal detected using each discrimination level with the phase of the clock signal, and compares the output ⁇ 1 of the phase comparator 31 with the output ⁇ 2 of the phase comparator 3 1 2. Is compared with ⁇ , and when the difference is equal to or smaller than ⁇ , the sample and hold circuit 34 is instructed to output the output ⁇ 1 of the phase comparison circuit 31i. , ⁇ ⁇ ⁇ is instructed to keep ⁇ 1.
- FIG. 8 shows the configuration of the phase comparison circuit in the third embodiment.
- Phase comparing circuit in the third embodiment a signal indicating an amplifier AO i O s, an oscillator 4 2 for changing the discrimination level of the amplifier 4 0 2 periodically, the oscillator 4 2 signals and identification level an adder 4 3 for adding the door, a phase comparator circuit 4 4-4 4 2 for comparing the phase of the signal and the clock signal from each amplifier, the phase comparing circuit 4 4 2 A circuit 45 for calculating the difference between the maximum value and the minimum value of the output ⁇ 2, a comparator 46 for comparing the reference value ⁇ with the output value from the circuit 45, and a signal from the phase comparison circuit 44 i. And a sample and hold circuit 47 for holding and outputting the signal. Note that the circuit 45 and the comparator 46 correspond to the control circuit 12 shown in FIG.
- the amplifier 4 0 1 given liglj level V th
- the amplifier 4 0 2 is given discrimination level periodically varies about the th. Therefore, the value of the phase difference output from the phase comparator circuit 4 4 2 changes in accordance with the discrimination level. This makes it possible to obtain a plurality of phase differences at different identification levels, so that the same effects as in the first and second embodiments can be obtained.
- the difference between the maximum value and the minimum value of the phase difference is calculated, and the difference is compared with ⁇ by the comparator 46.
- the sample-and-hold circuit 4 Instruct 7 to output the output ⁇ of the phase comparison circuit 44, and instruct it to keep ⁇ 1 when ⁇ ⁇ min or more.
- the circuit 45 may determine the difference between the maximum value and the minimum value of the phase difference, or may determine the difference between the phase differences obtained at two predetermined timings in the oscillator.
- FIG. 9 shows the configuration of the phase comparison circuit in the fourth embodiment.
- Phase comparing circuit in the fourth embodiment an amplifier 5 ( ⁇ 5 0 2, the Hogge type phase comparator circuit 5 1 5 1 2 for comparing the phase of the signal and the clock signal from the amplifier, Hogge type phase comparator circuit 5 1 i to 5 1 2
- An EXOR circuit 52 that performs an exclusive OR (EXOR) operation on the outputs ⁇ 1 and ⁇ 2 from ⁇ 1 and ⁇ 2, and a filter 53 that calculates the average of the output values of the EXOR circuit 52
- a comparator 54 for comparing an output value from the filter 53 with a reference value ⁇ , and a sample-and-hold circuit 55 for holding and outputting a signal from the phase comparison circuit 51.
- the EXOR circuit 52, the filter 53, and the comparator 54 correspond to the control circuit 12 shown in FIG.
- the amplifier 5 is given discrimination level V th, the amplifier 5 0 2 are given ⁇ 3 ⁇ 4 level V th + d V.
- the output of the Hogge type phase comparator After performing the EXOR operation on the pulse, the average value is calculated by the filter 53, and the average value is calculated. When the average value is equal to or smaller than ⁇ V, the output ⁇ 1 of the phase comparison circuit 51 is output. When the average value is equal to or larger than ⁇ V, the operation is performed so as to maintain ⁇ 1.
- the Hogge-type phase comparator is a phase comparator using two D-FFs (D-type flip-flop circuits) and two EXORs (IEEE Transactions on Electron Devices VOL. ED-32, No. .12 Dec.1985 "A Self Correcting Clock Recovery Circuit", Hogge, pp.2704-2706), Input data signal and clock signal to D-FF, output signal from D_FF and exclusive logic of the data signal This is a phase comparison circuit that outputs the summed signal.
- D-FFs D-type flip-flop circuits
- EXORs IEEE Transactions on Electron Devices VOL. ED-32, No. .12 Dec.1985 "A Self Correcting Clock Recovery Circuit", Hogge, pp.2704-2706
- this Hogge-type phase comparator outputs a pulse corresponding to the delay time from the rising or falling edge of the data signal to the rising edge of the subsequent cook signal as a phase ⁇ ⁇ sign.
- a phase ⁇ ⁇ sign Have the property to be.
- FIG. 11 (a) shows an example where the data signal rises steeply
- FIG. 11 (b) shows an example where the data signal rises slowly. Note that the signal level fluctuation at the points indicated by (1), (2), (3) ⁇ ⁇ ⁇ in Fig. 9
- the same reference numerals (1), (2), ( 3) ⁇ ⁇ ⁇ is indicated.
- the data signal and the mouth signal are input as shown in (1) and (2) in Fig. 11 (a) and (b).
- Amplifier 50 1 outputs a signal (3) obtained by identifying Ejji data signal identification level Vth
- the amplifier 50 2 obtained by identifying the edges of ft ⁇ level Vth + dth in the data signal the signal (4) is output.
- the Hogge type phase comparator 51i compares the signal (3) with the clock signal (2) and outputs the signal (5).
- Hogge type phase comparator circuit 51 2 compares the signal (4) and the clock signal (2), and outputs a signal of (6).
- a signal (7) representing the difference between the signal of (5) and the signal of (6) is obtained.
- the difference between (5) and (6) is larger as the state of the high level is longer.
- an average is obtained by the filter 53, and the comparator 54 determines whether the average is equal to or larger than a predetermined reference value AV.
- the averaging means for example, calculating the average of the values over time with the high level state being 1 and the low level state being 0. That is.
- the phase comparator circuit shown in FIG. 9 is an amplifier and Hogge type phase comparator circuit is an example of two sets of cases, Hogge type phase comparator circuit each of the phase comparator 2 1 2 1 3 6 And a phase comparison circuit in which the circuit 22 is replaced by an EXOR circuit and a filter.
- the fifth embodiment is an embodiment of a clock recovery circuit capable of performing phase control without causing a cycle slip even when a large phase difference occurs.
- FIG. 12 shows a clock recovery circuit in the fifth embodiment. As shown in FIG. 12, this clock recovery circuit can be divided into a PLL circuit portion and a portion that performs pattern comparison and outputs a bit shift voltage.
- the PLL circuit portion includes an adder 63 that adds a bit shift (described later) to an output signal of the phase comparison circuit 60, the loop filter 61, the VC062, and the phase comparison circuit 60.
- the part that performs pattern comparison and outputs the bit shift voltage is a pattern generator 64 that generates a pattern in synchronization with the clock signal, a D-type flip-flop circuit (D_FF65) that outputs the pattern of the data signal, and compares the phases of both patterns.
- D_FF65 D-type flip-flop circuit
- a bit shift voltage generation circuit 67 that generates a bit shift voltage according to the phase difference.
- FIG. 13 shows the case where the phase difference ⁇ between the data signal and the clock signal is smaller than ⁇
- (b) shows the case where the phase difference ⁇ between the data signal and the clock signal is larger than ⁇ .
- the signal level fluctuations at the points indicated by (1), (2), (3), and (4) in Fig. 12 are the same as in Figs. 13 (a) and (b), with the same signs (1), (2) , (3), (4).
- FIG. 14 shows (5) the output characteristic of the phase comparison circuit 60, (6) the voltage generated by the bit shift voltage generation circuit 67 corresponding to the phase difference of (5), and (7)
- the figure shows a voltage obtained by adding the output of the phase comparison circuit 60 and the voltage generated by the bit shift generation circuit 67.
- the data signal (1) and the clock signal (2) are input to the phase comparison circuit 60, and the phase comparison circuit 60 outputs a signal of the voltage shown in (5) according to the phase difference ⁇ .
- the pattern generation circuit 64 outputs a pattern (3) synchronized with the clock signal (2) (in FIG. 13, the pattern is indicated by “1001” as an example).
- the D-FF 65 outputs a data signal pattern (4) synchronized with the mouth signal while allowing a bit shift in a unit of information to be transmitted. In the case of FIG. 13A, no bit shift occurs in the pattern of the data signal. .
- the bit shift voltage generation circuit 67 generates a voltage 2 V shown in (6) corresponding to the shift of one bit, and this is added to the phase difference signal (5) by the S adder 63, and the actual A signal (7) corresponding to the phase difference is generated. For example, if the phase difference is 1.5 ⁇ , as shown in Fig. 14, the TO of XV is added to the loop filter 61 as the phase tally (7). And the frequency of VCO 62 is controlled according to the phase quotation. The phase of the cook signal is controlled.
- the phase range controlled to the optimum phase can be expanded by adding the offset corresponding to the direction of the phase shift to the phase difficulty.
- FIG. 14 shows an example in which the phase can be controlled to the optimum phase within three time slots.
- phase comparison circuit 60 shown in FIG. 12 Although a conventional one can be used as the phase comparison circuit 60 shown in FIG. 12, the use of the phase comparison circuits described in the first to fourth embodiments makes it possible to reduce noise in the amplitude direction. It is possible to provide a clock recovery circuit with reduced influence and less likely to lose synchronization.
- phase comparators described in the first to fourth embodiments in the PLL circuit having the normal configuration shown in FIG. 15 By using the phase comparators described in the first to fourth embodiments in the PLL circuit having the normal configuration shown in FIG. 15, a clock recovery circuit with reduced influence of noise in the amplitude direction can be realized.
- the configuration shown in FIG. 1 using the clock recovery circuit or the clock recovery circuit of the fifth embodiment and the identification circuit can be used as an optical receiving circuit in an optical receiving device of an optical communication system.
- FIG. 16 shows a configuration example of an optical communication system according to the sixth embodiment.
- This optical communication system includes an optical transmitting device 70 and an optical receiving device 80.
- the optical receiving device 80 includes the above-described optical receiving circuit 81, a frame processing circuit 82 for processing a frame in an optical signal, a separating circuit 83 for separating a wavelength of light, and a plurality of optical transmitting circuits.
- the circuit has 84i to 84 flick.
- the optical receiving circuit 81 has a clock recovery circuit and an liS (J circuit) of the present invention, so that a data signal that does not lose synchronization and does not excessively increase code errors can be output from a data signal having a poor SN ratio. Can be played.
- the present invention when the influence of noise in the amplitude direction is large, the phase signal at that time is not output, and the influence of noise in the amplitude direction is small.
- a phase comparison circuit that outputs only the phase difference signal can be realized.
- a clock recovery circuit that can remove the influence of noise in the amplitude direction can be realized.
- a clock recovery circuit that operates to recognize the phase difference and correct the phase difference can be realized.
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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EP03816546A EP1610488A4 (en) | 2003-03-31 | 2003-03-31 | PHASE COMPENSATION AND TACTIVE MANUFACTURING CIRCUIT |
JP2004570173A JP4077454B2 (ja) | 2003-03-31 | 2003-03-31 | 位相比較回路及びクロックリカバリ回路 |
PCT/JP2003/004118 WO2004088913A1 (ja) | 2003-03-31 | 2003-03-31 | 位相比較回路及びクロックリカバリ回路 |
US11/089,536 US7634035B2 (en) | 2003-03-31 | 2005-03-25 | Phase comparison circuit and clock recovery circuit |
Applications Claiming Priority (1)
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PCT/JP2003/004118 WO2004088913A1 (ja) | 2003-03-31 | 2003-03-31 | 位相比較回路及びクロックリカバリ回路 |
Related Child Applications (1)
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US11/089,536 Continuation US7634035B2 (en) | 2003-03-31 | 2005-03-25 | Phase comparison circuit and clock recovery circuit |
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US (1) | US7634035B2 (ja) |
EP (1) | EP1610488A4 (ja) |
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---|---|---|---|---|
JP2006165924A (ja) * | 2004-12-07 | 2006-06-22 | Nec Engineering Ltd | 遅延ロックループ |
WO2010067448A1 (ja) | 2008-12-11 | 2010-06-17 | 富士通株式会社 | 受信装置、伝送装置及び伝送方法 |
US8391436B2 (en) | 2008-12-11 | 2013-03-05 | Fujitsu Limited | Receiving apparatus, transmission apparatus, and transmission method |
JP2013229693A (ja) * | 2012-04-25 | 2013-11-07 | Nec Network & Sensor Systems Ltd | ビット位相同期回路及びこれを用いた受信装置 |
JP2014017807A (ja) * | 2012-06-11 | 2014-01-30 | Denso Corp | 半導体装置 |
Also Published As
Publication number | Publication date |
---|---|
US20050220182A1 (en) | 2005-10-06 |
JP4077454B2 (ja) | 2008-04-16 |
US7634035B2 (en) | 2009-12-15 |
JPWO2004088913A1 (ja) | 2006-07-06 |
EP1610488A1 (en) | 2005-12-28 |
EP1610488A4 (en) | 2007-08-01 |
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