CN108063617A - The clock frequency calibration method and system of a kind of low frequency RC oscillators - Google Patents
The clock frequency calibration method and system of a kind of low frequency RC oscillators Download PDFInfo
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- CN108063617A CN108063617A CN201711154750.4A CN201711154750A CN108063617A CN 108063617 A CN108063617 A CN 108063617A CN 201711154750 A CN201711154750 A CN 201711154750A CN 108063617 A CN108063617 A CN 108063617A
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- 238000000034 method Methods 0.000 title claims abstract description 40
- 239000013078 crystal Substances 0.000 claims abstract description 90
- 230000002045 lasting effect Effects 0.000 claims description 3
- 230000002459 sustained effect Effects 0.000 claims description 3
- 230000003044 adaptive effect Effects 0.000 claims description 2
- 239000013079 quasicrystal Substances 0.000 claims 2
- 239000000126 substance Substances 0.000 claims 1
- 238000013507 mapping Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Classifications
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- 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
- H03L7/099—Details of the phase-locked loop concerning mainly the controlled oscillator of the loop
- H03L7/0991—Details of the phase-locked loop concerning mainly the controlled oscillator of the loop the oscillator being a digital oscillator, e.g. composed of a fixed oscillator followed by a variable frequency divider
- H03L7/0992—Details of the phase-locked loop concerning mainly the controlled oscillator of the loop the oscillator being a digital oscillator, e.g. composed of a fixed oscillator followed by a variable frequency divider comprising a counter or a frequency divider
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
- H03L7/18—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop
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Abstract
The invention discloses a kind of clock frequency calibration system of low frequency RC oscillators, including low frequency RC oscillators, calibration control module, crystal oscillator control module and calibration module；Low frequency RC oscillators are low-frequency clock source to be calibrated, for providing low frequency RC standard time clocks for calibration module；Calibration control module enables crystal oscillator control module and calibration module for receiving externally input calibration enable signal, according to calibration enable signal；Crystal oscillator control module is used to external high frequency crystal oscillator being converted to high-frequency standard crystal oscillator clock, and high-frequency standard crystal oscillator clock is sent to calibration module；Calibration module calibrates low frequency RC standard time clocks using high-frequency standard crystal oscillator clock, obtains calibration frequency value；The invention also discloses a kind of clock frequency calibration methods of low frequency RC oscillators.Compared with traditional technology, the present invention can real-time ground calibrating clock frequency, for SOC provide real-time low-power consumption clock alignment output.
Description
Technical field
The present invention relates to technical field of integrated circuits, especially a kind of clock frequency calibration method of low frequency RC oscillators and
System.
Background technology
Low-frequency clock plays an important roll for digital display circuit, particularly in SOC, therefore generate one meet frequency and
The low frequency of required precision, the normally opened clock source of low-power consumption are the key that SOC normal works.
It is typically portion's design vibration in the chip in integrated circuits at present to substitute plug-in low frequency crystal oscillator
Device provides low frequency normally opened clock for digital display circuit, commonly referred to as on piece RC oscillators, abbreviation RC oscillators；On piece RC oscillators
Frequency and precision be to be determined by parameters such as internal resistance and capacitances, and these parameters are easily subject to semiconductor fabrication process
It influences, during the realization of technique, there may be larger process deviations for resistance and capacitance；In addition, with chip operation
The variation of temperature, the frequency of on piece RC oscillators can also change, so that digital display circuit cannot be correctly obtained on piece RC oscillators
Current clock frequency, influence chip and normally work.
In the Chinese patent for being 201610446124.1 in number of patent application, a kind of clock of low frequency RC oscillators is disclosed
Transmitting frequency calibration method, the technical solution are counted using oscillator output clock, obtain after result again with it is expected count value into
Row compares, if inconsistent with desired value, the rate-adaptive pacemaker of oscillator can be adjusted by calibrating circuit, after re-starting clock count
Count value comparison is carried out again；This process needs to cycle always until frequency is correct, since the clock of low frequency RC oscillators is defeated
Go out that the cycle is long, the time of each clock cycle is substantially in microsecond rank, therefore the technical solution is when for low frequency RC oscillators
During clock frequency calibration, it will take a long time, it is difficult to realize the output calibration frequency of real-time low-power consumption.
The content of the invention
To solve the above-mentioned problems, the clock frequency the object of the present invention is to provide a kind of low frequency RC oscillators calibrates system
System can provide the clock alignment output of real-time low-power consumption for SOC.
It is a further object to provide a kind of clock frequency calibration methods of low frequency RC oscillators, utilize this method
It being capable of real-time ground calibrating clock frequency.
Technical solution is used by the present invention solves the problems, such as it：
A kind of clock frequency calibration system of low frequency RC oscillators, including low frequency RC oscillators, calibration control module, crystal oscillator
Control module and calibration module；
Low frequency RC oscillators are low-frequency clock source to be calibrated, for providing low frequency RC standard time clocks for calibration module；
Control module is calibrated, for receiving externally input calibration enable signal, crystal oscillator is enabled according to calibration enable signal
Control module and calibration module；
Crystal oscillator control module, for external high frequency crystal oscillator to be converted to high-frequency standard crystal oscillator clock, and high-frequency standard is brilliant
The clock that shakes is sent to calibration module；
Calibration module calibrates low frequency RC standard time clocks using high-frequency standard crystal oscillator clock, obtains calibration frequency value.
Further, calibration module includes counting module and dividing module；Counting module utilizes high-frequency standard crystal oscillator clock pair
Low frequency RC standard time clocks are calibrated, and export the count value of calibration frequency to dividing module；Dividing module is used for count value
Be converted to calibration frequency value.
Further, counting module calibrates low frequency RC standard time clocks using high-frequency standard crystal oscillator clock, including：
The steady and sustained level signal sampled for high-frequency standard crystal oscillator clock, level are generated according to low frequency RC standard time clocks
The high level signal duration in signal corresponds to the specific periodicity of low frequency RC standard time clocks；
High-frequency standard crystal oscillator clock samples level signal, often samples the complete cycle of a low frequency RC standard time clock
Interior high level, count value add one, until low level occurs in level signal, obtain the count value of calibration frequency.
Further, dividing module is used to count value being converted to calibration frequency value, including：With low frequency RC standard clock cycles
Particular number value and high-frequency standard crystal oscillator clock frequency values product as dividend, using count value as divisor, be divided by
To calibration frequency value.
Further, control module is calibrated, for receiving externally input calibration enable signal, is made according to calibration enable signal
Energy crystal oscillator control module and calibration module, including：Crystal oscillator enable signal and calibration control signal are generated according to calibration enable signal,
Crystal oscillator control module is enabled using crystal oscillator enable signal, calculating task is issued to counting module using control signal is calibrated.
Further, calibration control module is additionally operable to control the time interval of adjacent calibration process twice, including：It is separated by one
Or the more than one low frequency RC clock cycle, calibration is once；Or according to the adjacent obtained count value of counting module twice it
The variation tendency of difference adaptively adjusts the time interval of adjacent calibration process twice.
Further, control module is calibrated, according to the variation tendency of the difference of the adjacent obtained count value of counting module twice,
The time interval of adjacent calibration process twice is adaptively adjusted, including：If the adjacent obtained count value of counting module twice it
Difference becomes smaller, and increases the time interval of adjacent calibration process twice；If the difference of the adjacent obtained count value of counting module twice becomes
Greatly, the time interval of adjacent calibration process twice is reduced.
A kind of clock frequency calibration method of low frequency RC oscillators, comprises the following steps：
A, external high frequency crystal oscillator is converted into high-frequency standard crystal oscillator clock, using high-frequency standard crystal oscillator clock as the mark of calibration
Quasi- clock source；
B, low frequency RC standard time clocks to be calibrated are inputted, the low of specific periodicity is selected by high-frequency standard crystal oscillator clock
Frequency RC standard time clocks.
C. lasting level signal is generated according to the low frequency RC standard time clocks of specific periodicity, by high-frequency standard crystal oscillator clock
Sample count is carried out to level signal, obtains the count value of calibration frequency.
D. count value is converted into calibration frequency value.
Further, in step C, sample count is carried out to level signal by high-frequency standard crystal oscillator clock, including：Often sample one
High level in the complete cycle of a low frequency RC standard time clocks, count value add one, until trailing edge occurs in level signal, become low
Until level.
Further, in step D, count value is converted into calibration frequency value, including：With the tool of low frequency RC standard clock cycles
The product of the frequency values of body quantitative value and high-frequency standard crystal oscillator clock, using count value as divisor, is divided by obtain school as dividend
Quasi- frequency values.
The beneficial effects of the invention are as follows：A kind of clock frequency calibration system of low frequency RC oscillators provided by the invention, profit
Low frequency RC standard time clocks are calibrated with high-frequency standard crystal oscillator clock, it need not be again using low frequency RC standard time clocks as during standard
Zhong Yuan on the basis of calibration accuracy is ensured, greatly reduces the time of entire calibration flow, and reduces further system
Power consumption；The clock frequency calibration method of a kind of low frequency RC oscillators provided by the invention, using high-frequency standard crystal oscillator clock as mark
Quasi- clock source accelerates calibration flow.Therefore, calibration system of the invention can provide the clock school of real-time low-power consumption for SOC
Quasi- output；It being capable of real-time ground calibrating clock frequency using the calibration method of the present invention.
Description of the drawings
Present pre-ferred embodiments are provided below in conjunction with the accompanying drawings, with the embodiment that the present invention will be described in detail.
Fig. 1 is the structure diagram of the calibration system of the present invention；
Fig. 2 is the counting principle figure of the counting module of the calibration system of the present invention；
Fig. 3 is the calibration Starting mode figure of the calibration control module of the calibration system of the present invention.
Specific embodiment
In the present specification, SOC refers to System On Chip, i.e. on-chip system chip；RC oscillators, that is, Resistance
Capacitance Oscillator, are also resistance-capacitance oscillator.
With reference to Fig. 1, a kind of clock frequency calibration system of low frequency RC oscillators of the invention, it is characterised in that：Including low
Frequency RC oscillators, calibration control module, crystal oscillator control module and calibration module；Low frequency RC oscillators are low-frequency clock to be calibrated
Source, for providing low frequency RC standard time clocks for calibration module；Control module is calibrated, for receiving the enabled letter of externally input calibration
Number, crystal oscillator control module and calibration module are enabled according to calibration enable signal；Crystal oscillator control module, for by external high frequency crystal oscillator
High-frequency standard crystal oscillator clock is converted to, and high-frequency standard crystal oscillator clock is sent to calibration module；Calibration module utilizes high-frequency standard
Crystal oscillator clock calibrates low frequency RC standard time clocks, obtains calibration frequency value.
Specifically, calibrate control module to be connected with external digital display circuit, digital display circuit reaches school by enable signal is calibrated
Quasi- control module, normally opened clock source of the low frequency RC oscillators as digital display circuit；Crystal oscillator control module by external high frequency crystal oscillator into
Line level is converted, and to be converted to available high-frequency standard crystal oscillator clock inside digital display circuit, crystal oscillator control module has switchable
Characteristic, can close when not in use.The calibration system of the present invention is not increasing the basis of low frequency RC pierce circuit scales
On with regard to the calibration of clock frequency can be completed, and entire calibration system is made of digital circuit, reduces the design of RC oscillators
Difficulty is implemented convenient for technical staff；Low frequency RC standard time clocks are calibrated with high-frequency standard crystal oscillator clock, are marked without using low frequency RC
Punctual clock greatly accelerates calibration flow, the clock alignment output of real-time low-power consumption can be provided for SOC as clock source.
Wherein, calibration module includes counting module and dividing module；Counting module, using high-frequency standard crystal oscillator clock to low
Frequency RC standard time clocks are calibrated, and export the count value of calibration frequency to dividing module；Dividing module is used to turn count value
It is changed to calibration frequency value.
Wherein, with reference to Fig. 2, counting module calibrates low frequency RC standard time clocks using high-frequency standard crystal oscillator clock, wraps
It includes：
The steady and sustained level signal sampled for high-frequency standard crystal oscillator clock, level are generated according to low frequency RC standard time clocks
The high level signal duration in signal corresponds to the specific periodicity of low frequency RC standard time clocks；
High-frequency standard crystal oscillator clock samples level signal, often samples the complete cycle of a low frequency RC standard time clock
Interior high level, count value add one, until low level occurs in level signal, obtain the count value of calibration frequency.
Wherein, dividing module is used to count value being converted to calibration frequency value, including：With low frequency RC standard clock cycles
The product of the frequency values of particular number value and high-frequency standard crystal oscillator clock, using count value as divisor, is divided by obtain as dividend
Calibration frequency value, and calibration frequency values are output to digital display circuit.Preferably, in the present embodiment, the meter that counting module obtains
Numerical value bit wide is 35, so dividing module should be designed to 35 division circuits, complete that a division arithmetic spent when
Between for 35 high-frequency standard crystal oscillator clocks cycle.
Wherein, control module is calibrated, for receiving externally input calibration enable signal, is enabled according to calibration enable signal
Crystal oscillator control module and calibration module, including：Crystal oscillator enable signal and calibration control signal, profit are generated according to calibration enable signal
Crystal oscillator control module is enabled with crystal oscillator enable signal, calculating task is issued to counting module using control signal is calibrated.
Wherein, with reference to Fig. 3, calibration control module is additionally operable to control the time interval of adjacent calibration process twice, including：Phase
Every the one or more low frequency RC clock cycle, calibration is once；Or according to the adjacent obtained meter of counting module twice
The variation tendency of the difference of numerical value adaptively adjusts the time interval of adjacent calibration process twice.
Control module is calibrated, according to the variation tendency of the difference of the adjacent obtained count value of counting module twice, adaptively
The time interval of adjacent calibration process twice is adjusted, including：If the difference of the adjacent obtained count value of counting module twice becomes smaller,
Increase the time interval of adjacent calibration process twice；If the difference of the adjacent obtained count value of counting module twice becomes larger, reduce
The time interval of adjacent calibration process twice.
Specifically, calibrate control module can the input based on digital display circuit, control time of adjacent calibration process twice.If
The difference of the adjacent obtained count value of counting module twice becomes smaller, then illustrates that the clock frequency that low frequency RC oscillators export at this time becomes
Change smaller, that is, the clock frequency exported is relatively stablized, it is possible to reduce calibration number, to reduce the whole power consumption power consumption of SOC, then school
The changing rule of the quasi- adaptive clock frequency of control module meeting increases the time interval of adjacent calibration process twice；If conversely,
The difference of the adjacent obtained count value of counting module twice becomes larger, then illustrates that the clock frequency that low frequency RC oscillators export at this time becomes
Change larger, that is, the clock frequency exported is unstable, in order to reduce error, it is necessary to increase calibration number, that is, reduces adjacent school twice
The time interval of quasi- process.Preferably, in the present embodiment, calibration control module can store adjacent calibration process twice
The difference and time interval of count value, and the mapping both established, controlled according to mapping relations adjacent calibration process twice when
Between be spaced.Therefore, calibrate control module can adaptively low frequency RC oscillators output clock frequency amplitude of variation, allow calibration system
Distribution of the power consumption power consumption of system in entire time-domain is more reasonable.
In the present embodiment, calibrating control module controls entire calibration system to complete primary calibration flow, including：
Step 1 after starting calibration flow, judges the operating mode residing for SOC.If SOC is in shutdown or standby mode, into
Enter step 2；If SOC is in operating mode, step 4 is directly entered；
Step 2, enabled crystal oscillator working power, it is therefore an objective to be ready for step 3；
Step 3, enabled crystal oscillator control module, generate high-frequency standard crystal oscillator clock；
Step 4, using high-frequency standard crystal oscillator clock as with reference to clock, sample count is carried out to low frequency RC standard time clocks, is obtained
To count value；
Count value obtained by sample count is made divide operations by step 5, and obtained business is calibration frequency value；
Step 6, after the completion of frequency calibration calculating, judge the operating mode of SOC.If SOC is in shutdown or standby mode,
Then enter step 7；If SOC is in operating mode, step 9 is directly entered.
Step 7 closes crystal oscillator control module, and high-frequency standard crystal oscillator clock is made to fail；
Step 8, when high-frequency standard crystal oscillator clock failure after, close crystal oscillator working power；
Step 9, this time calibration terminates, and completes calibration.
A kind of clock frequency calibration method of low frequency RC oscillators of the present invention, including：
A, external high frequency crystal oscillator is converted into high-frequency standard crystal oscillator clock, using high-frequency standard crystal oscillator clock as the mark of calibration
Quasi- clock source；
B, low frequency RC standard time clocks to be calibrated are inputted, the low of specific periodicity is selected by high-frequency standard crystal oscillator clock
Frequency RC standard time clocks.
C. lasting level signal is generated according to the low frequency RC standard time clocks of specific periodicity, by high-frequency standard crystal oscillator clock
Sample count is carried out to level signal, obtains the count value of calibration frequency.
D. count value is converted into calibration frequency value.
Wherein, in step C, sample count is carried out to level signal by high-frequency standard crystal oscillator clock, including：Often sample one
High level in the complete cycle of low frequency RC standard time clocks, count value add one, until trailing edge occurs in level signal, become low electricity
Until flat.
Wherein, in step D, count value is converted into calibration frequency value, including：With the specific of low frequency RC standard clock cycles
The product of the frequency values of quantitative value and high-frequency standard crystal oscillator clock, using count value as divisor, is divided by and is calibrated as dividend
Frequency values.
The calibration method of the present invention can be realized more rapidly by the use of high-frequency standard crystal oscillator clock as standard clock source
Calibration, and reduce the power consumption of SOC.
Presently preferred embodiments of the present invention and basic principle is discussed in detail in more than content, but the invention is not limited in
The above embodiment, those skilled in the art should be recognized that also had on the premise of without prejudice to spirit of the invention it is various
Equivalent variations and replacement, these equivalent variations and replacement all fall within the protetion scope of the claimed invention.
Claims (10)
1. a kind of clock frequency calibration system of low frequency RC oscillators, it is characterised in that：Including low frequency RC oscillators, calibration control
Module, crystal oscillator control module and calibration module；
The low frequency RC oscillators are low-frequency clock source to be calibrated, during for providing low frequency RC standards for the calibration module
Clock；
For receiving externally input calibration enable signal, crystal oscillator is enabled according to calibration enable signal for the calibration control module
Control module and calibration module；
The crystal oscillator control module, for external high frequency crystal oscillator to be converted to high-frequency standard crystal oscillator clock, and by the high frequency marking
Quasi- crystal oscillator clock is sent to calibration module；
The calibration module calibrates low frequency RC standard time clocks using the high-frequency standard crystal oscillator clock, obtains calibration frequency
Rate value.
2. a kind of clock frequency calibration system of low frequency RC oscillators according to claim 1, it is characterised in that：The school
Quasi-mode block includes counting module and dividing module；
The counting module calibrates low frequency RC standard time clocks using the high-frequency standard crystal oscillator clock, and exports calibration
The count value of frequency is to dividing module；
The dividing module is used to count value being converted to calibration frequency value.
A kind of 3. clock frequency calibration system of low frequency RC oscillators according to claim 2, which is characterized in that the meter
Digital-to-analogue block calibrates low frequency RC standard time clocks using the high-frequency standard crystal oscillator clock, including：
The steady and sustained level signal sampled for high-frequency standard crystal oscillator clock is generated according to the low frequency RC standard time clocks, it is described
The high level signal duration in level signal corresponds to the specific periodicity of low frequency RC standard time clocks；
The high-frequency standard crystal oscillator clock samples level signal, often samples the complete cycle of a low frequency RC standard time clock
Interior high level, count value add one, until low level occurs in level signal, obtain the count value of calibration frequency.
4. the clock frequency calibration system of a kind of low frequency RC oscillators according to claim 2, which is characterized in that described to remove
Method module is used to count value being converted to calibration frequency value, including：With the particular number value and height of low frequency RC standard clock cycles
The product of the frequency values of the quasi- crystal oscillator clock of frequency marking, using count value as divisor, is divided by obtain calibration frequency value as dividend.
A kind of 5. clock frequency calibration system of low frequency RC oscillators according to claim 2, which is characterized in that the school
Quasi- control module, for receiving externally input calibration enable signal, according to calibration enable signal enable crystal oscillator control module and
Calibration module, including：
Crystal oscillator enable signal and calibration control signal are generated according to the calibration enable signal, crystalline substance is enabled using crystal oscillator enable signal
It shakes control module, calculating task is issued to counting module using control signal is calibrated.
A kind of 6. clock frequency calibration system of low frequency RC oscillators according to claim 2, which is characterized in that the school
Quasi- control module is additionally operable to control the time interval of adjacent calibration process twice, including：It is separated by one or more low frequency
The RC clock cycle, calibration is once；Or the variation tendency of the difference according to the adjacent obtained count value of counting module twice, it is adaptive
The time interval of adjacent calibration process twice should be adjusted.
A kind of 7. clock frequency calibration system of low frequency RC oscillators according to claim 6, which is characterized in that the school
Quasi- control module according to the variation tendency of the difference of the adjacent obtained count value of counting module twice, adaptively adjusts adjacent two
The time interval of secondary calibration process, including：If the difference of the adjacent obtained count value of counting module twice becomes smaller, increase adjacent two
The time interval of secondary calibration process；If the difference of the adjacent obtained count value of counting module twice becomes larger, reduce adjacent school twice
The time interval of quasi- process.
8. a kind of clock frequency calibration method of low frequency RC oscillators, which is characterized in that comprise the following steps：
A, external high frequency crystal oscillator is converted into high-frequency standard crystal oscillator clock, during using standard of the high-frequency standard crystal oscillator clock as calibration
Zhong Yuan；
B, low frequency RC standard time clocks to be calibrated are inputted, the low frequency RC of specific periodicity is selected by high-frequency standard crystal oscillator clock
Standard time clock.
C. lasting level signal is generated according to the low frequency RC standard time clocks of specific periodicity, by high-frequency standard crystal oscillator clock to institute
It states level signal and carries out sample count, obtain the count value of calibration frequency.
D. count value is converted into calibration frequency value.
A kind of 9. clock frequency calibration method of low frequency RC oscillators according to claim 8, which is characterized in that the step
In rapid C, sample count is carried out to the level signal by high-frequency standard crystal oscillator clock, including：Often sample a low frequency RC standard
High level in the complete cycle of clock, count value add one, until trailing edge occurs in level signal, until becoming low level.
10. the clock frequency calibration method of a kind of low frequency RC oscillators according to claim 8, which is characterized in that described
In step D, count value is converted into calibration frequency value, including：With the particular number value and high frequency of low frequency RC standard clock cycles
The product of the frequency values of standard crystal oscillator clock, using count value as divisor, is divided by obtain calibration frequency value as dividend.
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Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4634288A (en) * | 1985-04-17 | 1987-01-06 | Clemar Manufacturing Corporation | Auxiliary timing source for ac-powered electronic clocks |
| US5594388A (en) * | 1995-06-07 | 1997-01-14 | American Microsystems, Inc. | Self-calibrating RC oscillator |
| US20040068383A1 (en) * | 2002-07-05 | 2004-04-08 | Stmicroelectronics S.A. | Method of operating a microcontroller chip having an internal RC oscillator and microcontroller chip embodying the method |
| US20040260500A1 (en) * | 2003-05-12 | 2004-12-23 | Manfred Punzenberger | Device and method for calibrating R/C filter circuits |
| CN101013934A (en) * | 2007-02-17 | 2007-08-08 | 北京航空航天大学 | Multi-path synchronous clock divider adapted for distributed simulation |
| US20090096924A1 (en) * | 2005-11-30 | 2009-04-16 | Fengshaun Zhou | Method and Apparatus for Providing a Stable Clock Signal |
| CN101552606A (en) * | 2009-04-29 | 2009-10-07 | 西安理工大学 | Intelligent self-calibration chip based on chip internal clock crystal oscillator and self-calibration method |
| CN102195646A (en) * | 2010-03-18 | 2011-09-21 | 上海华虹Nec电子有限公司 | Automatic clock oscillator calibration method and circuit |
| CN102830748A (en) * | 2012-08-10 | 2012-12-19 | 深圳芯邦科技股份有限公司 | Method and system for calibrating clock skew inside chip |
| US8364433B1 (en) * | 2008-12-18 | 2013-01-29 | Integrated Device Technology, Inc. | Accurate resistance capacitance (RC) time constant calibration with metal-oxide-metal (MOM) capacitors for precision frequency response of integrated filters |
| CN102916679A (en) * | 2012-10-19 | 2013-02-06 | 钜泉光电科技(上海)股份有限公司 | Circuit for supplying precise low-frequency clock signal, and control method for circuit |
| CN104679098A (en) * | 2013-11-29 | 2015-06-03 | 上海华虹集成电路有限责任公司 | Automatic calibration circuit for clock frequency of microcontroller |
| CN104901687A (en) * | 2015-05-20 | 2015-09-09 | 珠海市杰理科技有限公司 | Method and system for calibrating clock frequency |
| CN106130547A (en) * | 2016-06-20 | 2016-11-16 | 大唐微电子技术有限公司 | A kind of clock frequency calibration steps and device |
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-
2017
- 2017-11-20 CN CN201711154750.4A patent/CN108063617A/en active Pending
Patent Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4634288A (en) * | 1985-04-17 | 1987-01-06 | Clemar Manufacturing Corporation | Auxiliary timing source for ac-powered electronic clocks |
| US5594388A (en) * | 1995-06-07 | 1997-01-14 | American Microsystems, Inc. | Self-calibrating RC oscillator |
| US20040068383A1 (en) * | 2002-07-05 | 2004-04-08 | Stmicroelectronics S.A. | Method of operating a microcontroller chip having an internal RC oscillator and microcontroller chip embodying the method |
| US20040260500A1 (en) * | 2003-05-12 | 2004-12-23 | Manfred Punzenberger | Device and method for calibrating R/C filter circuits |
| US20090096924A1 (en) * | 2005-11-30 | 2009-04-16 | Fengshaun Zhou | Method and Apparatus for Providing a Stable Clock Signal |
| CN101013934A (en) * | 2007-02-17 | 2007-08-08 | 北京航空航天大学 | Multi-path synchronous clock divider adapted for distributed simulation |
| US8364433B1 (en) * | 2008-12-18 | 2013-01-29 | Integrated Device Technology, Inc. | Accurate resistance capacitance (RC) time constant calibration with metal-oxide-metal (MOM) capacitors for precision frequency response of integrated filters |
| CN101552606A (en) * | 2009-04-29 | 2009-10-07 | 西安理工大学 | Intelligent self-calibration chip based on chip internal clock crystal oscillator and self-calibration method |
| CN102195646A (en) * | 2010-03-18 | 2011-09-21 | 上海华虹Nec电子有限公司 | Automatic clock oscillator calibration method and circuit |
| CN102830748A (en) * | 2012-08-10 | 2012-12-19 | 深圳芯邦科技股份有限公司 | Method and system for calibrating clock skew inside chip |
| CN102916679A (en) * | 2012-10-19 | 2013-02-06 | 钜泉光电科技(上海)股份有限公司 | Circuit for supplying precise low-frequency clock signal, and control method for circuit |
| CN104679098A (en) * | 2013-11-29 | 2015-06-03 | 上海华虹集成电路有限责任公司 | Automatic calibration circuit for clock frequency of microcontroller |
| CN104901687A (en) * | 2015-05-20 | 2015-09-09 | 珠海市杰理科技有限公司 | Method and system for calibrating clock frequency |
| CN106569544A (en) * | 2015-10-10 | 2017-04-19 | 上海东软载波微电子有限公司 | Real time clock chip, and clock calibration method and apparatus |
| CN106130547A (en) * | 2016-06-20 | 2016-11-16 | 大唐微电子技术有限公司 | A kind of clock frequency calibration steps and device |
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| CN114221659A (en) * | 2022-02-22 | 2022-03-22 | 成都凯天电子股份有限公司 | Method and system for improving conversion precision of low-frequency signal and electronic equipment |
| CN114221659B (en) * | 2022-02-22 | 2022-05-24 | 成都凯天电子股份有限公司 | Method and system for improving conversion precision of low-frequency signal and electronic equipment |
| CN116318120A (en) * | 2023-03-30 | 2023-06-23 | 归芯科技(深圳)有限公司 | Calibration circuit, calibration method, chip and electronic equipment of RC oscillation clock |
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