CN101206236A - Device and method for detecting phase difference - Google Patents
Device and method for detecting phase difference Download PDFInfo
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- CN101206236A CN101206236A CNA2006101720005A CN200610172000A CN101206236A CN 101206236 A CN101206236 A CN 101206236A CN A2006101720005 A CNA2006101720005 A CN A2006101720005A CN 200610172000 A CN200610172000 A CN 200610172000A CN 101206236 A CN101206236 A CN 101206236A
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Abstract
A phase difference detection method is used to detect the phase difference of a first signal and a second signal, and has virtually equal frequency. The method includes the following steps that: firstly, a detection signal is generated; secondly, according to the first signal and the second signal, sampling of the detection signal is respectively carried out to obtain a first sampling value and a second sampling value; thirdly, whether the judgment condition that the first sampling value is equal to the previous first sampling value and the second sampling value is equal to the previous second sampling value exists is judged; when the judgment condition does not exist for the first time, the delay time of the detection signal at this moment is stored as a first time; when the judgment condition does not exist for the second time, the delay time of the detection signal at this moment is stored as a second time; finally, according to the first time and the second time, the phase difference of the first signal and the second signal can be obtained.
Description
Technical field
The relevant a kind of phase difference detection device of the present invention, and particularly relevant a kind of via carrying out the phase difference detection device that phase delay detects the phase differential between a plurality of target signals to detecting signal.
Background technology
Please refer to Figure 1B Figure 1A and 1B, Figure 1A is the calcspar of traditional phase difference detection device, and Figure 1B is the related signal sequential chart of the phase difference detection dress of Figure 1A.When wishing to get when knowing with the sequential signal CK1 of out-phase frequently and the phase differential between CK2, import it to XOR (Exclusive OR, XOR) door 110 is to obtain mutual exclusion signal XS, and, come with sample signal SS mutual exclusion signal XS sampling to obtain sampling result SO with the sample signal SS input trigger (Flip-flop) 120 that itself and signal generator 130 produces.The time of calculating sampling result SO afterwards and be high signal level comprise the cycle of what sample signal SS obtain with sequential signal CK2 and CK1 between corresponding Td time delay of phase differential, and according to time delay Td and sequential signal CK1 cycle obtain phase differential between sequential signal CK1 and CK2.Yet conventional phase device for detecting difference 100 has some shortcomings.
Accurately detect phase differential between sequential signal CK1 and CK2 if desire via conventional phase device for detecting difference 100, the frequency of sample signal SS must be far above the frequency of sequential signal CK1 and CK2, for example be its more than 20 times, begin to measure accurately the phase differential between sequential signal CK1 and CK2.Yet in general electronic installation, the sequential signal is many near the admissible highest frequency of the hardware condition of its circuit.So,, only measure mostly, make that the accurate degree of measurement result of phase differential is lower between sequential signal CK1 and CK2 with the measurement signal SS of frequency a little more than the sequential signal general real the work in the situation.In addition, desire to produce the measurement signal SS that frequency is higher than the frequency of sequential signal CK1 and CK2 and need adopt expensive sequence number generator 130 to produce, so, make that the cost of phase difference detection device is higher.
Summary of the invention
In view of this, the purpose of this invention is to provide a kind of phase difference detection device and phase difference detection method thereof, it can overcome the low and higher shortcoming of cost of the accurate degree of measurement of conventional phase device for detecting difference phase differential effectively.
According to purpose of the present invention, a kind of phase difference detection device is proposed, in order to detect the phase differential between first signal and second signal, it has the frequency that equates in fact.Phase difference detection device comprises sampling unit, signal generator and comparer.Sampling unit is in order to take a sample to detecting signal according to first and second signal respectively, to produce first sampling value and second sampling value respectively.Signal generator is in order to postpone to detect the signal delay time.Comparer is in order to comparison first sampling value and previous first sampling value, and comparison second sampling value and previous second sampling value.When first and previous first sampling value equates in fact and second and previous second sampling value when equating in fact, the comparator drives signal generator postpones to detect the signal delay time.Wherein, when first and previous first sampling value when unequal, it is the very first time that processing unit stores the time delay of detecting signal at present, and when second and previous second sampling value when unequal, and processing unit stores at present that be second time time delay of detection signal.And phase difference detection device and obtain the phase differential of first and second signal according to the difference of first and second time.
According to another object of the present invention, a kind of phase difference detection method is proposed, in order to detect the phase differential of first signal and second signal, first and second signal has the frequency that equates in fact.This phase difference detection method comprises following step.At first, produce the detection signal.Then, come to take a sample to detecting signal respectively according to first and second signal, to obtain first sampling value and second sampling value.Then, judge that first sampling value and previous first sampling value are for equating in fact and whether second sampling value and previous second sampling value are set up for the Rule of judgment that equates in fact.When Rule of judgment was false for the first time, storing the time delay of detecting signal this moment was the very first time.Non-when being false for the first time when Rule of judgment, storing the time delay of detecting signal this moment was second time.Afterwards, obtain the phase differential of first and second signal according to first and second time.
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, below will be especially exemplified by a preferred embodiment, and conjunction with figs. is elaborated.
Description of drawings
Figure 1A is the calcspar of traditional phase difference detection device.
Figure 1B is the related signal sequential chart of the phase difference detection dress of Figure 1A.
Fig. 2 is the calcspar of the phase difference detection device of preferred embodiment of the present invention.
Fig. 3 is the related signal sequential chart of the phase difference detection device 200 of Fig. 2.
Fig. 4 is a detailed circuit diagram of signal generator 210 among Fig. 2.
Fig. 5 is the process flow diagram according to the method for detecting phases of preferred embodiment of the present invention.
Embodiment
Phase difference detection device of the present invention and method thereof are to take a sample to detecting signal respectively with two sequential signals.Phase difference detection device of the present invention and method thereof are also by carrying out phase delay to detecting signal, come to find out mistiming between the sample trigger edge (Edge) of two sequential signals, and obtain the phase differential of two sequential signals according to this mistiming via the sampling value of two sequential signals.
Please refer to Fig. 2, it is the calcspar of the phase difference detection device of preferred embodiment of the present invention.Phase difference detection device 200 comprises signal generator 210, sampling unit 220 and comparer 230.Signal generator 210 detects signal SD in order to produce, and postpones to detect one period set time of signal SD in response to controlling signal SC.
Comparer 230 is in order to comparison sampling value S1 (n) and previous sampling value S1 (n-1), and comparison sampling value S2 (n) and previous sampling value S2 (n-1).When sampling value S1 (n) and previous sampling value S1 (n-1) for equate in fact and sampling value S2 (n) and previous sampling value S2 (n-1) when equal in fact, comparer 230 is in order to produce controlling signal SC, postpone to detect the signal SD set time to drive signal generator 210, and sampling unit 220 repeatedly comes detecting signal SD sampling according to sequential signal CLK1 and CLK2.
As sampling value S1 (n) and previous sampling value S1 (n-1) when being unequal, phase difference detection device 200 records detect the phase differential time corresponding data T1 of signal SD with respect to its start-phase this moment.Phase difference detection device 200 also judges whether to have recorded two time datas, when phase difference detection device 200 does not record two time datas as yet, comparer 230 continues to produce controlling signal SC and drives the 210 delay detection signal SD set times of signal generator, so that sampling unit 220 is repeatedly taken a sample to detecting signal SD according to sequential signal CLK1 and CLK2.
As sampling value S2 (n) and previous sampling value S2 (n-1) when being unequal again, phase difference detection device 200 records detect the phase differential time corresponding data T2 of signal SD with respect to its start-phase this moment.At this moment, phase difference detection device is to record two time datas, and its to be difference according to time data T2 and T1 obtain with sequential signal CLK1 and CLK2 between corresponding time delay of phase differential.For example time data T2 deducts the difference representative that time data T1 obtains and postpones with respect to the phase differential time corresponding of sequential signal CLK1 with sequential signal CLK2, is to obtain the phase differential of sequential signal CLK2 with respect to sequential signal CLK1 and time data T2 is deducted difference that T1 obtains divided by cycle of sequential signal CLK1.So, the phase difference detection device 200 of present embodiment can be taken a sample to detecting signal SD respectively by coming according to sequential signal CLK1 and CLK2, and obtains phase differential between sequential signal CLK1 and CLK2 to detecting method that signal SD carries out phase delay.
Please refer to Fig. 3, it is the related signal sequential chart of the phase difference detection device 200 of Fig. 2.In the present embodiment, the cycle of detecting signal SD for example equals three times of cycle of sequential signal CLK1 and CLK2.In the present embodiment, be to represent to detect the signal waveform of signal SD in different time points with signal waveform SD1, SD2 and SD3.
The zero-time of signal waveform SD1 is time point t0, and its start-phase equals 0 degree in fact.At this moment, sampling value S1 (n)=1,1,0}, and S2 (n)=1,1,0}.Afterwards, 210 pairs of signal generators detect signal SD and carry out phase delay, when the start-phase time point that detects signal SD equaled time point t1 in fact, sampling value S1 (n) changed and is not equal to previous sampling value S 1 (n-1), shown in signal waveform SD2.Equal time data T1 the time delay between time point t1 and t0 in fact, and the sampling value S1 (n) of this moment=0,1, and 0}, S2 (n)=1,1,0}.
Then, signal generator 210 continues to carry out phase delay to detecting signal SD, when the start-phase time point that detects signal SD equaled time point t2 in fact, sampling value S2 (n) changed and is not equal to previous sampling value S2 (n-1), shown in the signal waveform SD3 among Fig. 3.Equal time T 2 time delay between time point t2 and t0 in fact, and sampling value S2 (n)=0,1, and 0}, S1 (n)=0,1,0}.
Wherein, sampling value S1 (n) and S2 (n) for example change when overlapping in fact respectively at the positive edge sampling time point of sequential signal CLK1 and CLK2 and the level transition time point that detects signal SD.In the present embodiment, time point t1 and t2 for the low level that detects signal SD to high level transition time point respectively with the time point of the positive coincident of sequential signal CLK1 and CLK2.So, the phase difference detection device 200 of present embodiment can be according to the mistiming between the mistiming between time point t0 and t1 and time point t0 and t2, it is to be respectively time data T1 and T2, obtain the mistiming between the positive edge sampling time point of sequential signal CLK1 and CLK2, and then obtain the phase differential between sequential signal CLK1 and CLK2.
Phase difference detection device 200 also comprises deposit unit 240, in order to temporary transient storage sampling value S1 (n), S2 (n) and previous sampling value S1 (n-1) and S2 (n-1).In the present embodiment, deposit unit 240 for example comprises: impact damper (Buffer) B1 and B2.Impact damper B1 receives the sampling value S1 (n) and the S2 (n) of sampling unit 220 outputs, and exports impact damper B2 to after it is delayed one period set time.Comparer 230 comes as previous sampling value S1 (n-1) and S2 (n-1) with the sampling value that is stored among the impact damper B2, and is sampling value S1 (n) and S2 (n) with the sampling value that is stored among the impact damper B1.
Please refer to Fig. 4, it is a detailed circuit diagram of signal generator 210 among Fig. 2.Signal generator 210 comprises N impact damper B (1)～B (N) and multiplexer 112 that is connected in series, and N is a natural number.Impact damper B (1) is in order to reception start signal SI, and to exporting after its delay set time, impact damper B (2)～B (N) exports after the set time in order to postpone previous stage impact damper B (1)～B (N-1) respectively.
Multiplexer 212 comprises N input end, receive the output signal of start signal SI and impact damper B (1)～B (N) respectively, and multiplexer 112 is in response to selecting signal SCT to come that one of them comes to export sampling unit 220 to as detecting signal SD with the output signal of start signal SI and impact damper B (1)～B (N).In the present embodiment, multiplexer 212 is for example to export as detecting signal SD with start signal SI when selection signal SCT equals 0, and multiplexer 212 is for example exported as detecting signal SD with the output signal of impact damper B (1)～B (N) respectively when selecting signal SCT to be 1～N.
Phase difference detection device 200 also comprises counter 250, interrogates SC in order to the control that receives comparer 230 outputs, and according to this selection signal SCT is added up, and counter 250 selects signal to signal generator 210 in order to output.Wherein, select the initial numerical value of signal SCT to equal 0 in fact.And counter 250 is also for example in order to decide present detection signal SD to postpone what period set times with respect to its start-phase, to converse time data T1 and T2 according to the numeral that it added up.
In actual applications, it is lower and phase delay can be adjusted and each phase-delay quantity is to realize easily more than producing the sample signal SS of the required frequency of conventional phase device for detecting difference 100 far above sequential signal CK1 less than the detection signal SD of 2 pi/2s 0 in fact all to produce frequency.For example, 0.18 micron (Micron) technology, the frequency of sequential signal equals in fact will realize out frequency in fact near 20 times of 200MHz in the hardware condition for 200MHz that the sample signal SS of about 4GHz is very difficult.And be less than or equal to 200MHz in fact if produce frequency down in identical hardware condition, and but the detection signal SD of time lag of first order set time can utilize the structure of the signal generator 210 of Fig. 4, in the 0.18 micron technology of arranging in pairs or groups time delay be about 0.2 how the impact damper of second (Nanosecond) realize easily.
So, the detection signal SD that the phase difference detection device 200 of present embodiment can utilize and be easy to generate, frequency is lower and can postpone the set time detects the phase differential between sequential signal CLK1 and CLK2, needs to use and realizes difficulties and the sample signal SS of very high frequency measures the problem of the phase differential between sequential signal CK1 and CK2 accurately to solve conventional phase device for detecting difference 100.
Please refer to Fig. 5, it is the process flow diagram according to the method for detecting phases of preferred embodiment of the present invention.At first, as step 502, signal generator 210 produces and detects signal SD, and its cycle is essentially sequential signal CLK1 and CLK2 three times.Then, as step 504, come to take a sample to detecting signal SD respectively according to sequential signal CLK1 and CLK2, to obtain sampling value S1 (n) and S2 (n).Then,, judge sampling value S1 (n) and previous sampling value S1 (n-1), and whether sampling value S2 (n) and previous sampling value S2 (n) set up for equal in fact Rule of judgment for equal in fact as step 506.
As step 508, when above-mentioned Rule of judgment is false, judge whether it is to be false for the first time.If, execution in step 510, counter 250 records detect phase differential and the time corresponding data T1 of signal SD with respect to its start-phase this moment.Wherein, counter 250 is to judge that according to its numeral that adds up what period set times detect signal SD equals in fact with respect to the phase differential of its start-phase this moment, obtains time corresponding data T1 with conversion.Afterwards, execution in step 512, signal generator 210 postpones to detect one period set time of signal SD, and then execution in step 504 takes a sample to detecting signal SD according to sequential signal CLK1 and CLK2 again.
In step 508, judge whether it is to be false for the first time, if not, and execution in step 514, counter 250 records detect phase differential and the time corresponding data T2 of signal SD with respect to its start-phase this moment.Afterwards, as step 516, obtain the phase differential of sequential signal CLK1 and CLK2 according to cycle of time data T1, T2 and sequential signal CLK1.Wherein, step 516 is with the difference of this time data T1 and the T2 cycle divided by sequential signal CLK1, obtains the phase differential of sequential signal CLK1 and CLK2.And in step 506, judge whether above-mentioned Rule of judgment is set up, if, execution in step 512.
In the present embodiment, though only three times of cycle that equal sequential signal CLK1 and CLK2 in fact with the cycle of detecting signal SD are that example explains, yet, the cycle of the detection signal SD of present embodiment is not limited to three times of cycle of sequential signal CLK1 and CLK2, and can be the signal of any cycle more than or equal to the cycle of sequential signal CLK1 and CLK2.The cycle of detecting signal SD is preferably to be the integral multiple in the cycle of sequential signal CLK1 and CLK2.
In the present embodiment, though only the twentieth situation with cycle that equals sequential signal CLK1 and CLK2 time delay in fact of detecting signal SD is that example explains, yet, the time delay of detecting signal SD be not limited to equal sequential signal CLK1 and CLK2 cycle 1/20th, and also can be in fact less than 1/20th of sequential signal CLK1 and CLK2.For example detect signal SD the cycle that equals sequential signal CLK1 and CLK time delay in fact 1/50th so that phase difference detection device 200 detected phase differential are accurate more.
The phase difference detection device of present embodiment and method thereof are to come respectively the ductile detection signal of phase place to be taken a sample with two sequential signals, and the sampling value that detects signal are found out mistiming and phase differential between the rising edge of two sequential signals according to two sequential signals.So, the phase difference detection device of present embodiment and method thereof can solve effectively the conventional phase device for detecting difference need frequency of utilization high, realize difficulty and realize the higher sample signal of cost detect two between the sequential signal phase differential and because of the sample signal underfrequency causes the bigger problem of phase difference detection resultant error, but and have frequency of utilization lower, realize realizing that detection signal with low cost detects two phase differential and phase difference detection precision advantage of higher between the sequential signal easily.
In sum, though the present invention with preferred embodiment announcement as above, yet it is not in order to limit the present invention.The persond having ordinary knowledge in the technical field of the present invention, without departing from the spirit and scope of the present invention, when doing various changes that are equal to and retouching.Therefore, protection scope of the present invention is when looking accompanying being as the criterion that the application's claim scope defined.
Claims (13)
1. phase difference detection device, in order to detecting the phase differential between one first signal and one second signal, this first and this second signal have the frequency that equates in fact, this phase difference detection device comprises:
One signal generator detects signal in order to produce one, and postpones one set time of this detection signal in response to a controlling signal;
One sampling unit, in order to respectively according to this first and this second signal come this detection signal is taken a sample, to produce one first sampling value and one second sampling value respectively; And
One comparer, in order to relatively this first sampling value and previous first sampling value, and relatively this second sampling value and previous second sampling value, when this first and previous first sampling value for equate in fact and this second and previous second sampling value when equal in fact, this comparer produce this controlling signal with drive this signal generator postpone this detection signal should the set time;
Wherein, when this first and previous first sampling value when being unequal, this phase difference detection unit record should detect signal this moment and detect very first time of phase differential correspondence of the start-phase of signal with respect to this;
Wherein, when this second and previous second sampling value when being unequal, this phase difference detection unit record should detect signal this moment and detect one second time of phase differential correspondence of the start-phase of signal with respect to this;
Wherein, this phase difference detection device and according to this first and the difference of this second time obtain this first and the phase differential of this second signal.
2. phase difference detection device as claimed in claim 1 is characterized in that also comprising a temporary storage location, comprising:
One first impact damper;
One second impact damper, in order to receive this first and this second sampling value, and export this first impact damper to after it is postponed this time delay;
Wherein, the sampling value in this first impact damper of this comparer access is come as previous first and second sampling value, and the sampling value in this second impact damper of access come as this first and this second sampling value.
3. phase difference detection device as claimed in claim 1 is characterized in that this sampling unit comprises:
One first trigger in order to receiving this detection signal and this first signal, and is taken a sample to this detection signal according to this first signal, to obtain this first sampling value; And
One second trigger in order to receiving this detection signal and this second signal, and is taken a sample to this detection signal according to this second signal, to obtain this second sampling value.
4. phase difference detection device as claimed in claim 1 is characterized in that also comprising:
One counter receives this controlling signal, and comes to select signal to add up to one in response to this controlling signal.
5. phase difference detection device as claimed in claim 4 is characterized in that this signal generator comprises:
Multi-stage buffer, the first order impact damper of these grades impact damper receives an initial signal, and postpones this start signal and should export after the set time, and these impact dampers should be exported after the set time in order to the output signal that postpones the previous stage impact damper respectively; And
One multiplexer, comprise a plurality of input ends, receive the output signal of this start signal and these grades impact damper respectively, this multiplexer is selected signal in response to this, and one of them detects signal output as this with the output signal of this start signal and these grades impact damper.
6. phase difference detection device as claimed in claim 4, it is characterized in that this counter and according to this selection signal judge and write down this first and this second time what equal in fact should the set time.
7. phase difference detection device as claimed in claim 1, it is characterized in that this first and the phase differential of this second signal equal in fact this first and the difference of this second time divided by cycle of this first signal.
8. phase difference detection device as claimed in claim 1, the frequency that it is characterized in that this detection signal are the frequencies that is less than or equal to this first signal.
9. phase difference detection device as claimed in claim 7 is characterized in that the integral multiple of the cycle of this detection signal for the cycle of this first signal.
10. the detection method of a phase differential, in order to detecting the phase differential of one first signal and one second signal, this first and this second signal have the frequency that equates in fact, this detection method comprises:
Produce one and detect signal;
According to this first and this second signal come respectively this detection signal to be taken a sample, to obtain one first sampling value and one second sampling value;
Judge that this first sampling value and previous first sampling value are for equating in fact and whether this second sampling value and previous second sampling value are set up for a Rule of judgment that equates in fact;
When this Rule of judgment is false, judge whether this Rule of judgment is to be false for the first time;
When this Rule of judgment is false and when being false for the first time, record should detect signal and detect the phase differential and a corresponding very first time of the start-phase of signal with respect to this this moment;
Be false and non-when being false for the first time when this Rule of judgment, record should detect signal this moment and detect the phase differential and the one second corresponding time of the start-phase of signal with respect to this; And
According to this first and this second time obtain this first and the phase differential of this second signal.
11. detection method as claimed in claim 10 is characterized in that the step that writes down this very first time also comprises afterwards:
Postpone one time delay of this detection signal, and repeat according to this first and this second signal come the step of respectively this detection signal being taken a sample.
12. detection method as claimed in claim 11 is characterized in that judging that the step whether this Rule of judgment is set up also comprises afterwards:
If carry out to postpone this and detect the step that signal should time delay.
13. detection method as claimed in claim 10, it is characterized in that according to this first, cycle of this second time and this first signal obtain this first and the step of the phase differential of this second signal be with this first and the difference of this second time divided by cycle of this first signal, obtain this first and the phase differential of this second signal.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101915875A (en) * | 2010-07-30 | 2010-12-15 | 西安电子科技大学 | Method for measuring phase difference of common-period signals based on delay unit dedicated for FPGA |
| CN102288821A (en) * | 2011-04-29 | 2011-12-21 | 北京合康亿盛变频科技股份有限公司 | Measuring method, measuring device, measuring procedure and carrier for phase difference of three-phase circuit |
| CN104569589A (en) * | 2014-12-24 | 2015-04-29 | 北京无线电测量研究所 | Device and method for automatically testing Ku waveband phase difference of multi-branch power amplifier |
| CN106814339A (en) * | 2015-11-27 | 2017-06-09 | 西门子(深圳)磁共振有限公司 | Phase information acquisition methods, system and magnetic resonance imaging system |
| CN108345554A (en) * | 2017-01-22 | 2018-07-31 | 晨星半导体股份有限公司 | Determine to sample the method for the sampling phase of clock signal and relevant electronic device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2335322B (en) * | 1998-03-13 | 2002-04-24 | Ericsson Telefon Ab L M | Phase detector |
| JP2003037486A (en) * | 2001-07-23 | 2003-02-07 | Mitsubishi Electric Corp | Phase difference detection circuit |
| TWI258137B (en) * | 2003-04-10 | 2006-07-11 | Via Optical Solution Inc | Method and related optical disk accessing apparatus for calibrating optical disk tilt servo system according to non-constant relation between locations and tilt angles of optical disk |
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- 2006-12-22 CN CN2006101720005A patent/CN101206236B/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101915875A (en) * | 2010-07-30 | 2010-12-15 | 西安电子科技大学 | Method for measuring phase difference of common-period signals based on delay unit dedicated for FPGA |
| CN102288821A (en) * | 2011-04-29 | 2011-12-21 | 北京合康亿盛变频科技股份有限公司 | Measuring method, measuring device, measuring procedure and carrier for phase difference of three-phase circuit |
| CN102288821B (en) * | 2011-04-29 | 2014-01-08 | 北京合康亿盛变频科技股份有限公司 | Measuring method, measuring device, measuring procedure and carrier for phase difference of three-phase circuit |
| CN104569589A (en) * | 2014-12-24 | 2015-04-29 | 北京无线电测量研究所 | Device and method for automatically testing Ku waveband phase difference of multi-branch power amplifier |
| CN104569589B (en) * | 2014-12-24 | 2017-03-15 | 北京无线电测量研究所 | A kind of Ku wave bands multiple branch circuit power amplifier phase contrast automatic test device and method |
| CN106814339A (en) * | 2015-11-27 | 2017-06-09 | 西门子(深圳)磁共振有限公司 | Phase information acquisition methods, system and magnetic resonance imaging system |
| CN108345554A (en) * | 2017-01-22 | 2018-07-31 | 晨星半导体股份有限公司 | Determine to sample the method for the sampling phase of clock signal and relevant electronic device |
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