CN102545778B - Closed-loop temperature compensation method and device for clock crystal oscillator - Google Patents
Closed-loop temperature compensation method and device for clock crystal oscillator Download PDFInfo
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Abstract
The invention provides a closed-loop temperature compensation method and a closed-loop temperature compensation device for a clock crystal oscillator. A second pulse of a 32768Hz quartz crystal is continuously corrected by using an accurate high-frequency quartz crystal until the number of high-frequency pulses of a high-frequency pulse signal which is read in a time gate generated by the 32768Hz quartz crystal is equal to that of the high-frequency pulses which are theoretically accurate. Because the 32768Hz quartz crystal can be calibrated at any temperature, the frequency offset of the 32768Hz quartz crystal caused by temperature difference is compensated. In a closed-loop temperature compensation mode which is provided by the embodiment of the invention, the frequency temperature characteristic curve shape of a clock crystal is unrelated, and consistency is not required. Therefore, by adoption of a temperature soft compensation method provided by the invention, accurate temperature compensation can be realized. The cost of the temperature soft compensation method is low, and the size of a corresponding system is small.
Description
Technical field
The present invention relates to clock accuracy technique for temperature compensation field, particularly a kind of closed-loop temperature compensation of clock crystal oscillator method and apparatus.
Background technology
At present, except requiring extra high standard source, the high precision clock frequency of using in industry and daily life is mainly from quartz oscillator.The frequency of the quartz oscillator that at present, clock is used is both at home and abroad 32768Hz.
Referring to accompanying drawing 1, this figure is the frequency-temperature characteristic curve chart of 32768Hz quartz oscillator.The frequency departure of 32768Hz quartz oscillator within the scope of-30 to+60 ℃ is about (+40) ppm to (150) ppm (ppm represent 1,000,000/) than Δ F/F, and the clocking error producing every day like this can reach more than 15 seconds.
Therefore, if reach higher clock accuracy, need to carry out temperature-compensating to the frequency departure of quartz oscillator, current temperature-compensating comprises two kinds of hard benefit and soft benefits.
Hard benefit is mainly that the hard cost of mending is higher, and whole volume is larger from the enterprising trip temperature compensation of hardware, is not suitable for the little and low occasion of cost of clock volume.
The method of soft benefit is mainly to have MCU chip to come across the occasion of identical product simultaneously, utilize the good 32768Hz quartz crystal of frequency-temperature characteristic curve conformity of quartz oscillator as the independent real-time clock (RTC hanging in MCU chip, Real-Time Clock) the outer crystal of circuit, utilize MCU inside/outside portion sensor for measuring temperature detected temperatures value, the frequency temperature deviate that show that by searching frequency-temperature characteristic curve table this temperature value is corresponding, MCU realizes compensation correction by revising pulse per second (PPS) frequency division value (32768 ± N, N is real-time correction value).
This soft compensating method cost is lower at present, but because it is open-loop compensation, any one goes wrong the consistency of the consistency of the reference voltage that the consistency of frequency-temperature characteristic curve conformity, temperature sensor, A/D gather, the manufacture of the inner A/D Acquisition Circuit of MCU etc., all cannot guarantee final compensation result.If have any one or multinomial going wrong, will cause compensation result inaccurate.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of closed-loop temperature compensation of clock crystal oscillator method and apparatus, and cost is low, and volume is little, and compensation result is accurate.
The invention provides a kind of closed-loop temperature compensation of clock crystal oscillator method, comprise the following steps:
Obtaining default high-frequency signal expression formula of the temperature T in the unit interval and high-frequency impulse number Pt in every section of broken line is: Pt=(a*T+b); Wherein, a, b are constant; The frequency-temperature characteristic curve of described default high-frequency signal is sectional broken line, in every section of broken line, is straight line;
When temperature T, read the high-frequency impulse number Pt1 of the described default high-frequency signal in the scheduled time gate that 32768Hz quartz crystal produces;
When temperature T, by Pt=(a*T+b), calculate the theoretical high-frequency impulse number Pt2 of described default high-frequency signal in described scheduled time gate;
The high-frequency impulse number Pt1 relatively reading and corresponding theoretical high-frequency impulse number Pt2;
When the high-frequency impulse number Pt1 reading is greater than theoretical high-frequency impulse number Pt2, regulate the narrowed width of the pulse per second (PPS) of quartzy 32768Hz crystal generation; Otherwise regulate the width of the pulse per second (PPS) of 32768Hz quartz crystal generation to broaden; Until the high-frequency impulse number Pt1 reading equates with theoretical high-frequency impulse number Pt2.
Preferably, described temperature T is obtained by temperature sensor, the AD collection value N that temperature sensor obtains
aDbecome piecewise linear relationship with temperature T, expression formula is: T=Kn*N
aD; Wherein, Kn is the proportionality coefficient of n section.
Preferably, the expression formula of the default high-frequency signal of described the acquisition temperature T in the unit interval and high-frequency impulse number Pt in every section of broken line, is specially:
When the first temperature T 1, the high-frequency impulse number that obtains described high-frequency signal in M standard second burst length is P1; When the second temperature T 2, the high-frequency impulse number that obtains described high-frequency signal in M standard second burst length is P2;
The temperature T of this default high-frequency signal in the unit interval and the expression formula of high-frequency impulse number Pt are: Pt=(a*T+b); Wherein, a=(P1-P2)/[M* (T1-T2)]; B=(P1T1-P2T2)/[M (T1-T2)].
Preferably, the narrowed width of the pulse per second (PPS) that described adjusting 32768Hz quartz crystal produces or broaden, is specially: by regulating the clock division coefficient of 32768Hz quartz crystal regulate the narrowed width of pulse per second (PPS) or broaden.
Preferably, the frequency of described default high-frequency signal is more than or equal to 1MHz.
The present invention also provides a kind of closed-loop temperature compensation of clock crystal oscillator device, comprises with lower unit:
The expression formula acquiring unit of default high-frequency signal, for obtaining default high-frequency signal expression formula of the temperature T in the unit interval and high-frequency impulse number Pt in every section of broken line is: Pt=(a*T+b); Wherein, a, b are constant; The frequency-temperature characteristic curve of described default high-frequency signal is sectional broken line, in every section of broken line, is straight line;
High-frequency impulse number reading unit, for when the temperature T, reads the high-frequency impulse number Pt1 of the described default high-frequency signal in the scheduled time gate that 32768Hz quartz crystal produces;
Computing unit, for when the temperature T, calculates the theoretical high-frequency impulse number Pt2 of described default high-frequency signal in described scheduled time gate by Pt=(a*T+b);
Comparing unit, for the high-frequency impulse number Pt1 that relatively reads and corresponding theoretical high-frequency impulse number Pt2;
Pulse per second (PPS) regulon, when the comparative result of comparing unit is the high-frequency impulse number Pt1 that reads while being greater than theoretical high-frequency impulse number Pt2, for regulating the narrowed width of the pulse per second (PPS) that 32768Hz quartz crystal produces; Otherwise for regulating the width of the pulse per second (PPS) of 32768Hz quartz crystal generation to broaden; Until be adjusted to the high-frequency impulse number Pt1 reading, equate with theoretical high-frequency impulse number Pt2.
Preferably, also comprise temperature collecting cell, the AD collection value N of temperature collecting cell
aDbecome piecewise linear relationship with temperature T, expression formula is: T=Kn*N
aD; Wherein, Kn is the proportionality coefficient of n section.
Preferably, the expression formula acquiring unit of described default high-frequency signal, for obtaining the expression formula of the default high-frequency signal temperature T in the unit interval and high-frequency impulse number Pt in every section of broken line, is specially:
When the first temperature T 1, the high-frequency impulse number that obtains described high-frequency signal in M standard second burst length is P1; When the second temperature T 2, the high-frequency impulse number that obtains described high-frequency signal in M standard second burst length is P2;
The temperature T of this default high-frequency signal in the unit interval and the expression formula of high-frequency impulse number Pt are: Pt=(a*T+b); Wherein, a=(P1-P2)/[M* (T1-T2)]; B=(P1T1-P2T2)/[M (T1-T2)].
Preferably, described pulse per second (PPS) regulon for by regulate 32768Hz quartz crystal the pulse per second (PPS) of clock division coefficient adjustment narrowed width or broaden.
Preferably, the frequency of described default high-frequency signal is more than or equal to 1MHz.
Compared with prior art, the present invention has the following advantages:
The closed-loop temperature compensation of clock crystal oscillator method and apparatus that the embodiment of the present invention provides, by the pulse per second (PPS) that high frequency quartz crystal is constantly proofreaied and correct 32768Hz quartz crystal accurately, until the high-frequency impulse number of the high-frequency pulse signal reading in the time gate producing at 32768Hz quartz crystal is with high-frequency impulse number is identical accurately in theory, owing to can all 32768Hz quartz crystal being calibrated, therefore compensated 32768Hz quartz crystal due to the different frequency departures that produce of temperature under arbitrary temp.Due to the closed loop thermal compensation way that the embodiment of the present invention adopts, therefore irrelevant with the frequency-temperature characteristic curve shape of clock crystal, more do not require consistency.Therefore the soft compensating method of temperature that, the present embodiment provides can be realized accurate temperature-compensating.And the cost of soft compensating method itself is lower, corresponding system bulk is less.
Accompanying drawing explanation
Fig. 1 is the frequency-temperature characteristic curve chart of 32768Hz quartz oscillator;
Fig. 2 is closed-loop temperature compensation of clock crystal oscillator embodiment of the method one flow chart provided by the invention;
Fig. 3 is closed-loop temperature compensation of clock crystal oscillator device embodiment provided by the invention mono-structure chart;
Fig. 4 is closed-loop temperature compensation of clock crystal oscillator device embodiment provided by the invention bis-structure charts.
Embodiment
For those skilled in the art being understood better and implementing technical scheme of the present invention, introduce several technical terms related to the present invention below.
Quartz oscillator: be a kind of resonating device that utilizes the piezoelectric effect of quartz crystal (crystalline solid of silicon dioxide) to make, its basic comprising is roughly: from a quartz crystal, by certain azimuth, cut thin slice (referred to as wafer, it can be square, rectangle or circle etc.), on its two corresponding surfaces, apply silver layer as electrode, on each electrode, respectively welding a lead-in wire receives on pin, add package casing and just formed quartz-crystal resonator, referred to as quartz crystal or crystal oscillator.
32768Hz quartz crystal Chang Zuowei clock crystal.
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
Referring to Fig. 2, this figure is closed-loop temperature compensation of clock crystal oscillator embodiment of the method one flow chart provided by the invention.
The closed-loop temperature compensation of clock crystal oscillator method that the embodiment of the present invention provides, comprises the following steps:
S201: obtaining default high-frequency signal expression formula of the temperature T in the unit interval and high-frequency impulse number Pt in every section of broken line is:
Pt＝(a*T+b) (1)
Wherein, a, b are constant; The frequency-temperature characteristic curve of described default high-frequency signal is sectional broken line, in every section of broken line, is straight line;
The frequency-temperature characteristic curve of the default high-frequency signal that the present embodiment is selected is sectional broken line, and every section of broken line is straight line, and T and Pt are linear relationship like this.
Default high-frequency signal in the present embodiment can be produced by any high frequency quartz oscillator, and optimized frequency is quartz oscillator more than 1MHz, and what the present invention selected is the quartz oscillator of 16MHz.
S202: when temperature T, read the high-frequency impulse number Pt1 of the described default high-frequency signal in the scheduled time gate that 32768Hz quartz crystal produces;
For example, scheduled time gate is N second, and the N producing at 32768Hz quartz crystal reads the high-frequency impulse number Pt1 of default high-frequency signal in second;
It should be noted that, Pt1 is that the N producing at 32768Hz quartz crystal read in second, and this N second is coarse.
S203: when temperature T, calculate the theoretical high-frequency impulse number Pt2 of described default high-frequency signal in described scheduled time gate by Pt=(a*T+b);
It should be noted that, scheduled time gate is N second, and corresponding standard time gate is also N second, and just Pt2 is obtained by formula (1), and formula (1) is to obtain under the standard time, and therefore corresponding time gate is also standard.
Owing to having been obtained high-frequency impulse number corresponding to any temperature in the unit interval by S201, therefore, by formula (1), can calculate theoretical high-frequency impulse number in any temperature, any time section.While varying with temperature due to this high-frequency signal, frequency shift (FS) is very little, and therefore, corresponding pulse per second (PPS) is very accurate.
It should be noted that S202 and the S203 sequencing that has no time.
S204: the high-frequency impulse number Pt1 relatively reading and corresponding theoretical high-frequency impulse number Pt2;
Because the pulse per second (PPS) of high-frequency signal is very accurate, therefore with this high-frequency signal, as benchmark, proofread and correct 32768Hz quartz crystal.If 32768Hz quartz crystal is also very accurate, the high-frequency impulse number Pt1 reading so and corresponding theoretical high-frequency impulse number Pt2 should equate.
S205: when the high-frequency impulse number Pt1 reading is greater than theoretical high-frequency impulse number Pt2, regulate the narrowed width of the pulse per second (PPS) of quartzy 32768Hz crystal generation; Otherwise regulate the width of the pulse per second (PPS) of 32768Hz quartz crystal generation to broaden; Until the high-frequency impulse number Pt1 reading equates with theoretical high-frequency impulse number Pt2.
The closed-loop temperature compensation of clock crystal oscillator method that the embodiment of the present invention provides, by the pulse per second (PPS) that high frequency quartz crystal is constantly proofreaied and correct 32768Hz quartz crystal accurately, until the high-frequency impulse number of the high-frequency pulse signal reading in the time gate producing at 32768Hz quartz crystal is with high-frequency impulse number is identical accurately in theory, owing to can all 32768Hz quartz crystal being calibrated, therefore compensated 32768Hz quartz crystal due to the different frequency departures that produce of temperature under arbitrary temp.Due to the closed loop thermal compensation way that the embodiment of the present invention adopts, therefore irrelevant with the frequency-temperature characteristic curve shape of clock crystal, more do not require consistency.Therefore the soft compensating method of temperature that, the present embodiment provides can be realized accurate temperature-compensating.And the cost of soft compensating method itself is lower, corresponding system bulk is less.
Introduce and how to obtain the temperature T of this default high-frequency signal in the unit interval and the expression formula of high-frequency impulse number Pt below.
Owing to presetting the frequency-temperature characteristic curve of high-frequency signal, it is sectional broken line, every section of broken line is straight line, therefore can obtain by the straight line expression formula of two point form the temperature T of this default high-frequency signal in the unit interval and the expression formula of high-frequency impulse number Pt, be specially:
When the first temperature T 1, the high-frequency impulse number that obtains described high-frequency signal in M standard second burst length is P1; When the second temperature T 2, the high-frequency impulse number that obtains described high-frequency signal in M standard second burst length is P2;
The temperature T of this default high-frequency signal in the unit interval and the expression formula of high-frequency impulse number Pt are: Pt=(a*T+b); Wherein, a=(P1-P2)/[M* (T1-T2)]; B=(P1T1-P2T2)/[M (T1-T2)].
It should be noted that, because the slope of straight line corresponding to every section of broken line is different, therefore, can search corresponding broken line by temperature T, then obtain the expression formula of corresponding temperature T and high-frequency impulse number Pt.
Be understandable that, by the high-frequency impulse number in M standard second pulse, can obtain the high-frequency impulse number in the unit interval.When M numerical value is larger, the high-frequency impulse number in the unit interval of acquisition is more accurate.
Temperature T in the embodiment of the present invention can be obtained by temperature sensor, the temperature AD collection value N that temperature sensor obtains
aDbecome piecewise linear relationship with temperature T, expression formula is: T=Kn*N
aD; Wherein, Kn is the proportionality coefficient of n section.
That in the present embodiment, adopt is AD collection value N
aD, the reference voltage therefore gathering with temperature absolute value and AD is, the manufacture of AD Acquisition Circuit itself is irrelevant, thereby do not need the consistency of temperature sensor, the consistency of the inner A/D Acquisition Circuit manufacture of the consistency of the reference voltage that A/D gathers and MCU.
The narrowed width of the pulse per second (PPS) that described adjusting 32768Hz quartz crystal produces or broaden, is specially: can be by regulating the clock division coefficient of 32768Hz quartz crystal regulate the narrowed width of pulse per second (PPS) or broaden.When divide ratio is larger, the width of pulse per second (PPS) is wider, otherwise narrower.
It should be noted that, the closed loop thermal compensation method that the embodiment of the present invention provides is by the pulse per second (PPS) output after adjusting, and the while is as the benchmark of new scheduled time gate.For example, the M value of scheduled time gate is 5 seconds, and 5 pulse per second (PPS)s after adjusting are as the time gate of counting high-frequency impulse.
Closed loop thermal compensation method provided by the invention is simple in structure, and it is convenient to control, and without special processes requirement, is applicable to the occasion of using in enormous quantities, and cost is low.
Method based on above-mentioned closed-loop temperature compensation of clock crystal oscillator, the present invention also provides the device of closed-loop temperature compensation of clock crystal oscillator, below in conjunction with specific embodiment, describes its part in detail.
Referring to Fig. 3, this figure is closed-loop temperature compensation of clock crystal oscillator device embodiment provided by the invention mono-structure chart.
The closed-loop temperature compensation of clock crystal oscillator device that the embodiment of the present invention provides, comprises with lower unit:
The expression formula acquiring unit 401 of default high-frequency signal, for obtaining default high-frequency signal expression formula of the temperature T in the unit interval and high-frequency impulse number Pt in every section of broken line is: Pt=(a*T+b); Wherein, a, b are constant; The frequency-temperature characteristic curve of described default high-frequency signal is sectional broken line, in every section of broken line, is straight line;
High-frequency impulse number reading unit 402, for when the temperature T, reads the high-frequency impulse number Pt1 of the described default high-frequency signal in the scheduled time gate that 32768Hz quartz crystal produces;
Computing unit 403, for when the temperature T, calculates the theoretical high-frequency impulse number Pt2 of described default high-frequency signal in described scheduled time gate by Pt=(a*T+b);
Comparing unit 404, for the high-frequency impulse number Pt1 that relatively reads and corresponding theoretical high-frequency impulse number Pt2;
Pulse per second (PPS) regulon 405, when the comparative result of comparing unit 404 is the high-frequency impulse number Pt1 that reads while being greater than theoretical high-frequency impulse number Pt2, for regulating the narrowed width of the pulse per second (PPS) that 32768Hz quartz crystal produces; Otherwise for regulating the width of the pulse per second (PPS) of 32768Hz quartz crystal generation to broaden; Until be adjusted to the high-frequency impulse number Pt1 reading, equate with theoretical high-frequency impulse number Pt2.
The closed-loop temperature compensation of clock crystal oscillator device that the embodiment of the present invention provides, by the pulse per second (PPS) that high frequency quartz crystal is constantly proofreaied and correct 32768Hz quartz crystal accurately, until the high-frequency impulse number of the high-frequency pulse signal reading in the time gate producing at 32768Hz quartz crystal is with high-frequency impulse number is identical accurately in theory, owing to can all 32768Hz quartz crystal being calibrated, therefore compensated 32768Hz quartz crystal due to the different frequency departures that produce of temperature under arbitrary temp.What adopt due to the embodiment of the present invention is closed loop thermal compensation way, therefore irrelevant with the frequency-temperature characteristic curve shape of clock crystal, does not more require consistency.Therefore the soft compensating method of closed loop thermal that, the present embodiment provides can be realized accurate temperature-compensating.And the cost of soft compensating method itself is lower, corresponding system bulk is less.
How the expression formula acquiring unit 401 of introducing default high-frequency signal below obtains the temperature T of this default high-frequency signal in the unit interval and the expression formula of high-frequency impulse number Pt.
Owing to presetting the frequency-temperature characteristic curve of high-frequency signal, it is sectional broken line, every section of broken line is straight line, therefore can by the straight line expression formula of two point form, obtain the temperature T of this default high-frequency signal in the unit interval and the expression formula of high-frequency impulse number Pt in every section of broken line, be specially:
When the first temperature T 1, the high-frequency impulse number that obtains described high-frequency signal in M standard second burst length is P1; When the second temperature T 2, the high-frequency impulse number that obtains described high-frequency signal in M standard second burst length is P2;
The temperature T of this default high-frequency signal in the unit interval and the expression formula of high-frequency impulse number Pt are: Pt=(a*T+b); Wherein, a=(P1-P2)/[M* (T1-T2)]; B=(P1T1-P2T2)/[M (T1-T2)].
It should be noted that, because the slope of straight line corresponding to every section of broken line is different, therefore, can search corresponding broken line by temperature T, then obtain the expression formula of corresponding temperature T and high-frequency impulse number Pt.
Be understandable that, by the high-frequency impulse number in M standard second pulse, can obtain the high-frequency impulse number in the unit interval.When M numerical value is larger, the high-frequency impulse number in the unit interval of acquisition is more accurate.
Temperature T in the embodiment of the present invention can be obtained by temperature sensor, the temperature AD collection value N that temperature sensor obtains
aDbecome piecewise linear relationship with temperature T, expression formula is: T=Kn*N
aD; Wherein, Kn is the proportionality coefficient of n section.
That in the present embodiment, adopt is AD collection value N
aD, the reference voltage therefore gathering with temperature absolute value and AD is, the manufacture of AD Acquisition Circuit itself is irrelevant, thereby do not need the consistency of temperature sensor, the consistency of the inner A/D Acquisition Circuit manufacture of the consistency of the reference voltage that A/D gathers and MCU.
Pulse per second (PPS) regulon 405 regulates the narrowed width of the pulse per second (PPS) that 32768Hz quartz crystals produce or broadens, and is specially: can be by regulating the clock division coefficient of 32768Hz quartz crystal regulate the narrowed width of pulse per second (PPS) or broaden.
It should be noted that, the closed loop thermal compensation method that the embodiment of the present invention provides is by the pulse per second (PPS) output after adjusting, and the while is as the benchmark of new scheduled time gate.For example, the M value of scheduled time gate is 5 seconds, and 5 pulse per second (PPS)s after adjusting are as the time gate of counting high-frequency impulse.
Referring to Fig. 4, this figure is device embodiment bis-structure charts provided by the invention.
It should be noted that, the closed loop thermal compensation arrangement that the embodiment of the present invention provides can be realized by MCU, supposes that MCU has obtained the temperature T of default high-frequency signal in the unit interval in advance and the expression formula of high-frequency impulse number Pt is: Pt=(a*T+b).
Temperature sensor 501 measures ambient temperature, pass to AD by the temperature signal of measurement and adopt unit 502;
The AD that AD adopts unit 502 to obtain temperature gathers N
aDthereby the linear relationship by AD collection value and temperature T, obtains temperature T;
Computing unit 503, the high-frequency impulse number Pt2 while calculating the Current Temperatures T in scheduled time gate;
The plug-in high-frequency crystal 509 of MCU is used for producing default high-frequency signal;
The clock signal that 32768Hz quartz crystal 510 produces produces pulse per second (PPS) by frequency divider 507;
The pulse per second (PPS) that scheduled time gate 506 is produced by frequency divider 507 obtains scheduled time gate;
High-frequency impulse number reading unit 505 can have the counter of MCU inside to realize, for read the number Pt1 of the high-frequency impulse of high-frequency crystal generation in scheduled time gate.
Comparing unit 504, for comparing Pt1 and Pt2, sends to pulse per second (PPS) regulon 508 by comparative result;
Pulse per second (PPS) regulon 508, for regulating the divide ratio of frequency divider 507, and then adjusts the pulse per second (PPS) width that 32768Hz produces; Until Pt1 and Pt2 equate.
It should be noted that, the pulse per second (PPS) that frequency divider 507 the produces pulse per second (PPS) after by way of compensation is simultaneously for output.
Closed loop thermal compensation method provided by the invention can utilize the resource of MCU self to complete temperature-compensating, does not need to add in addition hardware, therefore simple in structure, and it is convenient to control, and without special processes requirement, is applicable to the occasion of using in enormous quantities, and cost is low.
The above, be only preferred embodiment of the present invention, not the present invention done to any pro forma restriction.Although the present invention discloses as above with preferred embodiment, yet not in order to limit the present invention.Any those of ordinary skill in the art, do not departing from technical solution of the present invention scope situation, all can utilize method and the technology contents of above-mentioned announcement to make many possible changes and modification to technical solution of the present invention, or be revised as the equivalent embodiment of equivalent variations.Therefore, every content that does not depart from technical solution of the present invention,, all still belongs in the scope of technical solution of the present invention protection any simple modification made for any of the above embodiments, equivalent variations and modification according to technical spirit of the present invention.
Claims (8)
1. a closed-loop temperature compensation of clock crystal oscillator method, is characterized in that, comprises the following steps:
Obtaining default high-frequency signal expression formula of the temperature T in the unit interval and high-frequency impulse number Pt in every section of broken line is: Pt=(a*T+b); Be specially: when the first temperature T 1, the high-frequency impulse number that obtains described high-frequency signal in M standard second burst length is P1; When the second temperature T 2, the high-frequency impulse number that obtains described high-frequency signal in M standard second burst length is P2; The temperature T of this default high-frequency signal in the unit interval and the expression formula of high-frequency impulse number Pt are: Pt=(a*T+b); Wherein, a=(P1-P2)/[M* (T1-T2)]; B=(P1T1-P2T2)/[M (T1-T2)]; Wherein, a, b are constant; The frequency-temperature characteristic curve of described default high-frequency signal is sectional broken line, in every section of broken line, is straight line;
When temperature T, read the high-frequency impulse number Pt1 of the described default high-frequency signal in the scheduled time gate that 32768Hz quartz crystal produces;
When temperature T, by Pt=(a*T+b), calculate the theoretical high-frequency impulse number Pt2 of described default high-frequency signal in described scheduled time gate;
The high-frequency impulse number Pt1 relatively reading and corresponding theoretical high-frequency impulse number Pt2;
When the high-frequency impulse number Pt1 reading is greater than theoretical high-frequency impulse number Pt2, regulate the narrowed width of the pulse per second (PPS) of 32768Hz quartz crystal generation; Otherwise regulate the width of the pulse per second (PPS) of 32768Hz quartz crystal generation to broaden; Until the high-frequency impulse number Pt1 reading equates with theoretical high-frequency impulse number Pt2.
2. method according to claim 1, is characterized in that, described temperature T is obtained by temperature sensor, the AD collection value N that temperature sensor obtains
aDbecome piecewise linear relationship with temperature T, expression formula is: T=Kn*N
aD; Wherein, Kn is the proportionality coefficient of n section.
3. method according to claim 1, it is characterized in that, the narrowed width of the pulse per second (PPS) that described adjusting 32768Hz quartz crystal produces or broaden, is specially: by regulating the clock division coefficient of 32768Hz quartz crystal regulate the narrowed width of pulse per second (PPS) or broaden.
4. method according to claim 1, is characterized in that, the frequency of described default high-frequency signal is more than or equal to 1MHz.
5. a closed-loop temperature compensation of clock crystal oscillator device, is characterized in that, comprises with lower unit:
The expression formula acquiring unit of default high-frequency signal, for obtaining default high-frequency signal expression formula of the temperature T in the unit interval and high-frequency impulse number Pt in every section of broken line is: Pt=(a*T+b); Be specially: when the first temperature T 1, the high-frequency impulse number that obtains described high-frequency signal in M standard second burst length is P1; When the second temperature T 2, the high-frequency impulse number that obtains described high-frequency signal in M standard second burst length is P2; The temperature T of this default high-frequency signal in the unit interval and the expression formula of high-frequency impulse number Pt are: Pt=(a*T+b); Wherein, a=(P1-P2)/[M* (T1-T2)]; B=(P1T1-P2T2)/[M (T1-T2)]; Wherein, a, b are constant; The frequency-temperature characteristic curve of described default high-frequency signal is sectional broken line, in every section of broken line, is straight line;
High-frequency impulse number reading unit, for when the temperature T, reads the high-frequency impulse number Pt1 of the described default high-frequency signal in the scheduled time gate that 32768Hz quartz crystal produces;
Computing unit, for when the temperature T, calculates the theoretical high-frequency impulse number Pt2 of described default high-frequency signal in described scheduled time gate by Pt=(a*T+b);
Comparing unit, for the high-frequency impulse number Pt1 that relatively reads and corresponding theoretical high-frequency impulse number Pt2;
Pulse per second (PPS) regulon, when the comparative result of comparing unit is the high-frequency impulse number Pt1 that reads while being greater than theoretical high-frequency impulse number Pt2, for regulating the narrowed width of the pulse per second (PPS) that 32768Hz quartz crystal produces; Otherwise for regulating the width of the pulse per second (PPS) of 32768Hz quartz crystal generation to broaden; Until be adjusted to the high-frequency impulse number Pt1 reading, equate with theoretical high-frequency impulse number Pt2.
6. device according to claim 5, is characterized in that, also comprises temperature collecting cell, the AD collection value N of temperature collecting cell
aDbecome piecewise linear relationship with temperature T, expression formula is: T=Kn*N
aD; Wherein, Kn is the proportionality coefficient of n section.
7. device according to claim 5, is characterized in that, described pulse per second (PPS) regulon is used for by the narrowed width of the clock division coefficient adjustment pulse per second (PPS) of adjusting 32768Hz quartz crystal or broadens.
8. device according to claim 5, is characterized in that, the frequency of described default high-frequency signal is more than or equal to 1MHz.
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| CN103970184B (en) * | 2013-02-06 | 2017-05-17 | 上海东软载波微电子有限公司 | Method and device for adjusting real time clock system |
| CN104065341B (en) * | 2013-03-18 | 2018-06-05 | 厦门歌乐电子企业有限公司 | Crystal oscillator clock compensation method and device |
| CN104218891A (en) * | 2013-06-05 | 2014-12-17 | 上海华虹集成电路有限责任公司 | Closed-loop temperature compensation device for clock crystal oscillator |
| CN114020069B (en) * | 2021-11-05 | 2022-12-09 | 北京北方华创微电子装备有限公司 | Temperature adjusting method, temperature adjusting device and semiconductor process equipment |
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| CN100471035C (en) * | 2004-06-03 | 2009-03-18 | 电子科技大学 | Temperature-compensating method for quartz crystal oscillator |
| CN101826850A (en) * | 2010-03-19 | 2010-09-08 | 北京天碁科技有限公司 | Method for controlling working frequency of quartz crystal and reference clock based on quartz crystal |
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| CN100471035C (en) * | 2004-06-03 | 2009-03-18 | 电子科技大学 | Temperature-compensating method for quartz crystal oscillator |
| CN101826850A (en) * | 2010-03-19 | 2010-09-08 | 北京天碁科技有限公司 | Method for controlling working frequency of quartz crystal and reference clock based on quartz crystal |
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