CN109450378A - A kind of crystal oscillating circuit and clock signal generation method - Google Patents
A kind of crystal oscillating circuit and clock signal generation method Download PDFInfo
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- CN109450378A CN109450378A CN201811295233.3A CN201811295233A CN109450378A CN 109450378 A CN109450378 A CN 109450378A CN 201811295233 A CN201811295233 A CN 201811295233A CN 109450378 A CN109450378 A CN 109450378A
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- 239000013078 crystal Substances 0.000 title claims abstract description 83
- 238000000034 method Methods 0.000 title claims description 21
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 title claims description 8
- 239000003990 capacitor Substances 0.000 claims abstract description 97
- 230000004913 activation Effects 0.000 claims description 39
- 238000013461 design Methods 0.000 abstract description 7
- 238000005516 engineering process Methods 0.000 abstract description 6
- 230000006870 function Effects 0.000 description 10
- 238000004590 computer program Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 230000003213 activating effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 239000013307 optical fiber Substances 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 238000003491 array Methods 0.000 description 1
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- 230000002708 enhancing effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 230000003287 optical effect Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
- H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
- H03B5/1237—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device comprising means for varying the frequency of the generator
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- Oscillators With Electromechanical Resonators (AREA)
Abstract
The invention discloses a kind of crystal oscillating circuits, including crystal oscillator and capacitor array module, capacitor array module includes capacitor array, capacitor array and crystal oscillator are electrically connected, wherein, capacitor array includes multiple capacitor cells, and each of multiple capacitor cells, which can be activated selectively, adjusts the output frequency of crystal oscillator to generate different total capacitance values.Crystal oscillating circuit of the invention can be widely used in the electronic circuits such as server, sender unit, greatly increase the flexibility and reliability of design；It is not required to replace capacitor manually, only need to be the frequency of changeable crystal oscillator according to different control commands, convenient for debugging verifying；Based on existing crystal oscillator technology, it is easy to apply.
Description
Technical field
The present invention relates to crystal oscillator design fields, more specifically, particularly relating to a kind of crystal oscillating circuit and clock signal generation side
Method.
Background technique
Crystal oscillator abbreviation crystal oscillator, is widely used in various electronic circuits, generates frequency of oscillation.In the server,
The work of the chips such as CPU, PCH (Platform Controller Hub, platform management center south bridge) requires crystal oscillator generation
Reference clock carrys out work, and the frequency of crystal oscillator slightly deviation, which this may result in system, can not work normally, it can be seen that the weight of crystal oscillator
The property wanted.In existing crystal oscillator, mostly it is fixed frequency crystal oscillator, is not easy to debug, this strongly limits the applications of crystal oscillator.
In view of the above-mentioned defects in the prior art, this field urgently needs a kind of adjustable frequency crystal oscillating circuit.
Summary of the invention
In view of this, the purpose of the embodiment of the present invention is to propose a kind of crystal oscillating circuit and clock signal generation method, energy
Enough solve the problems, such as that existing fixed frequency crystal oscillator is not easy to debug.
Based on above-mentioned purpose, the one side of the embodiment of the present invention provides a kind of crystal oscillating circuit, comprising:
Crystal oscillator；With
Capacitor array module, capacitor array module include capacitor array, and capacitor array and crystal oscillator are electrically connected,
Wherein, capacitor array includes multiple capacitor cells, and each of multiple capacitor cells can be selective
Ground activation adjusts the output frequency of crystal oscillator to generate different total capacitance values.
In some embodiments, capacitor array module further includes decoder, and decoder is for receiving activation signal and right
Activation signal executes decoded operation to obtain activation command, and the capacitor cell in capacitor array has choosing according to corresponding activation command
Activate to selecting property.
In some embodiments, decoder includes line decoder and column decoder,
Wherein, line decoder is for receiving row active signal and executing decoded operation to row active signal to obtain line activating
The capacitor cell to activate corresponding line is ordered,
Column decoder is for receiving column activation signal and executing decoded operation to column activation signal to obtain column activation command
To activate the capacitor cell of respective column.
In some embodiments, row active signal is n-bit binary signal, and capacitor array includes 2nRow capacitor
Unit, wherein n is positive integer, and every a line capacitor cell is controlled activation by corresponding row active signal.
In some embodiments, column activation signal is m bit binary signal, and capacitor array includes 2mColumn capacitance
Unit, wherein m is positive integer, and each column capacitance unit is controlled activation by corresponding column activation signal.
In some embodiments, multiple capacitor cells are connected using parallel way.
In some embodiments, the capacitance of multiple capacitor cells successively linear increment.
In some embodiments, the crystal oscillator is that have source crystal oscillator, and capacitor array is in parallel with the capacitor of crystal oscillator.
In some embodiments, crystal oscillator is to have source crystal oscillator or without source crystal oscillator.
The another aspect of the embodiment of the present invention additionally provides a kind of clock signal generation method, comprising:
The capacitor array of above-mentioned crystal oscillating circuit is controlled, according to control signal to generate the clock signal of different frequency.
The present invention has following advantageous effects: crystal oscillating circuit provided in an embodiment of the present invention can be widely used in clothes
It is engaged in the electronic circuits such as device, sender unit, greatly increases the flexibility and reliability of circuit design；It is not required to replace electricity manually
Hold, only need to be the frequency of changeable crystal oscillator according to different control commands, convenient for debugging verifying；Based on existing crystal oscillator technology,
It is easy to apply.When clock signal generation method provided in an embodiment of the present invention provides accurate using above-mentioned crystal oscillating circuit for chip
Clock signal, to keep chip operation more stable accurate.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Other embodiments are obtained according to these attached drawings.
Fig. 1 is the schematic diagram according to the crystal oscillating circuit of one embodiment of the invention；
Fig. 2 is the schematic diagram according to the capacitor array module of one embodiment of the invention；And
Fig. 3 is the schematic diagram according to the crystal oscillating circuit of the capacitor array module comprising Fig. 2 of one embodiment of the invention.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with specific embodiment, and reference
The embodiment of the present invention is further described in attached drawing.
Based on above-mentioned purpose, the first aspect of the embodiment of the present invention proposes a kind of one embodiment of crystal oscillating circuit,
Shown in fig. 1 is the schematic diagram of the crystal oscillating circuit.As shown in fig. 1, which may include crystal oscillator 10 and capacitor array
Module 20, capacitor array module 20 may include capacitor array 201, and capacitor array 201 and crystal oscillator 10 are electrically connected, wherein electricity
Holding array 201 may include multiple capacitor cell (not shown), and each of multiple capacitor cells can be selective
Ground activation adjusts the output frequency of crystal oscillator 10 (clock signal frequency) to generate different total capacitance values.
The output frequency of electronics crystal oscillator is usually determined by its inductance and capacitance, and existing crystal oscillator inductance and capacitance are logical
It is often fixed, therefore existing crystal oscillator is mostly the crystal oscillator of fixed frequency, is not easy to be debugged.In view of this, the present invention mentions
A kind of digital control crystal oscillating circuit comprising capacitor array 201 is gone out, the capacitor cell in capacitor array 201 is able to respond number
Control command is activated to select or is not activated, to change total capacitance, crystal oscillator is made to generate different output frequencies.Example
Such as, the crystal oscillator 10 in Fig. 1 has a fixed capacitor CfixWith fixed inductance L, itself can generate the clock of fixed frequency
Signal, and be provided with after capacitor array, then it is codetermined by the activation capacitor in fixed capacity, inductance and capacitor array 201
The output signal frequency of crystal oscillator.
Therefore, crystal oscillating circuit of the invention can be widely used in server, sender unit etc. compared to the prior art
In electronic circuit, the flexibility and reliability of circuit design are greatly increased；It is not required to replace capacitor manually, it only need to be according to different controls
The frequency of the i.e. changeable crystal oscillator of system order, convenient for debugging verifying；Based on existing crystal oscillator technology, it is easy to apply.
In a preferred embodiment, capacitor array module 20 can also include decoder (also known as thermometer decoder,
Binary decoder or address decoder), decoder can receive activation signal and execute decoded operation to activation signal to obtain
Activation command is obtained, the capacitor cell in capacitor array 201 is activated according to corresponding activation command.
In a preferred embodiment, decoder may include line decoder and column decoder, wherein line decoder is used for
It receives row active signal and capacitor list of the decoded operation to obtain line activating order to activate corresponding line is executed to row active signal
Member, and column decoder is for receiving column activation signal and executing decoded operation to column activation signal to obtain column activation command
Activate the capacitor cell of respective column.
For example, row active signal can be n-bit binary signal, and capacitor array includes 2nRow capacitor cell,
Middle n is positive integer, and every a line capacitor cell is controlled activation by corresponding row active signal.Column activation signal can be m bit
Binary signal, and the capacitor array includes 2mColumn capacitance unit, wherein m is positive integer, and each column capacitance unit is by phase
The column activation signal answered activates to control.It should be noted that n and m can be equal here, can not also wait.
Fig. 2 is the schematic diagram of one embodiment of capacitor array module.Fig. 3 is the crystalline substance of the capacitor array module comprising Fig. 2
The schematic diagram of vibration circuit.As shown in Figures 2 and 3, capacitor array module 20 may include capacitor array 201, line decoder 202
And column decoder 203.In this embodiment, the row active signal of input and column activation signal are 5 bit binary signals
(that is, n=5, m=5), therefore can control 32 × 32 capacitor arrays (25=32).For example, row active signal can be passed through
Any a line or multirow capacitor cell are controlled, any one or more columns per page capacitor cell can be controlled by column activation signal.It can also
To control some capacitor cell by row active signal and column activation signal, for example, if selection activation capacitor cell C1,
It can be activated by C1 row active signal of the row and the column activation signal of C1 column.It is emphasized that the present invention is not
It is restricted to the described embodiments, also that is, n and m can take any positive integer in zone of reasonableness.
In a preferred embodiment, multiple capacitor cells are connected using parallel way, can play capacitor appearance in this way
It is worth the effect being added.
In a preferred embodiment, the capacitance of multiple capacitor cells in capacitor array is different, for example, multiple electricity
The capacitance successively linear increment for holding unit, in other words, from first capacitor cell to a last capacitor cell, capacitance
Increment be it is linear, so can guarantee digital control crystal oscillator output frequency with control command linear change.Alternatively, in capacitor array
The capacitance of capacitor cell can also be identical.
In a preferred embodiment, capacitor array can be connected in parallel with crystal oscillator.
In a preferred embodiment, crystal oscillator of the invention can be for active crystal oscillator or without source crystal oscillator.
Based on above-mentioned purpose, the second aspect of the embodiment of the present invention proposes the one of a kind of clock signal generation method
A embodiment.This method comprises: controlling the capacitor array of above-mentioned crystal oscillating circuit, according to control signal to generate different frequency
Clock signal.It is given chip (for example, CPU, PCH) specifically, crystal oscillator provides clock signal, chip is believed according to the clock received
Number generating control signal (activation signal) feeds back to the decoder of capacitor array, and decoder executes decoded operation to the control signal
To obtain control command, the capacitor of capacitor array is selectively activated according to the control command to adjust the clock signal frequency of crystal oscillator
Rate.
Crystal oscillating circuit of the invention can also be applied in phase-locked loop circuit, can be realized the load of signal in WiFi design
The functions such as wave modulation.
It should be noted that those of ordinary skill in the art will appreciate that realizing the whole in above-described embodiment method or portion
Split flow can instruct related hardware to complete by computer program, and it is computer-readable that the program can be stored in one
It takes in storage medium, the program is when being executed, it may include such as the process of the embodiment of the above method.Wherein, the storage is situated between
Matter can be magnetic disk, CD, read-only memory (Read-Only Memory, ROM) or random access memory (Random
Access Memory, RAM) etc..The computer program can achieve that corresponding preceding method embodiment is identical or phase
Similar effect.
In addition, disclosed method is also implemented as the computer program executed by CPU according to embodiments of the present invention, it should
Computer program may be stored in a computer readable storage medium.When the computer program is executed by CPU, the present invention is executed
The above-mentioned function of being limited in method disclosed in embodiment.
In addition, above method step also can use controller and for storing so that controller realizes above-mentioned steps function
The computer readable storage medium of the computer program of energy is realized.
In addition, it should be appreciated that realizing computer readable storage medium used by method of the invention (for example, depositing
Reservoir) it can be volatile memory or nonvolatile memory, or may include volatile memory and non-volatile deposit
Both reservoirs.As an example and not restrictive, nonvolatile memory may include read-only memory (ROM), programming ROM
(PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory.Volatile memory
It may include random access memory (RAM), which can serve as external cache.As an example rather than limit
Property, RAM can be obtained in a variety of forms, such as synchronous random access memory (DRAM), dynamic ram (DRAM), synchronous dram (SDRAM), double
Data rate SDRAM (DDR SDRAM), enhancing SDRAM (ESDRAM), synchronization link DRAM (SLDRAM) and direct Rambus
RAM(DRRAM).The storage equipment of disclosed aspect is intended to the memory of including but not limited to these and other suitable type.
Those skilled in the art will also understand is that, various illustrative logical blocks, mould in conjunction with described in disclosure herein
Block, circuit and algorithm steps may be implemented as the combination of electronic hardware, computer software or both.It is hard in order to clearly demonstrate
This interchangeability of part and software, with regard to various exemplary components, square, module, circuit and step function to its into
General description is gone.This function is implemented as software and is also implemented as hardware depending on concrete application and application
To the design constraint of whole system.Those skilled in the art can realize described in various ways for every kind of concrete application
Function, but this realization decision should not be interpreted as causing a departure from range disclosed by the embodiments of the present invention.
Various illustrative logical blocks, module and circuit, which can use, in conjunction with described in disclosure herein is designed to
The following component of function described here is executed to realize or execute: general processor, digital signal processor (DSP), dedicated collection
At circuit (ASIC), field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, divide
Any combination of vertical hardware component or these components.General processor can be microprocessor, but alternatively, processing
Device can be any conventional processors, controller, microcontroller or state machine.Processor also may be implemented as calculating equipment
Combination, for example, the combination of DSP and microprocessor, multi-microprocessor, one or more microprocessors combination DSP and/or any
Other this configurations.
The step of method in conjunction with described in disclosure herein or algorithm, can be directly contained in hardware, be held by processor
In capable software module or in combination of the two.Software module may reside within RAM memory, flash memory, ROM storage
Device, eprom memory, eeprom memory, register, hard disk, removable disk, CD-ROM or known in the art it is any its
In the storage medium of its form.Illustrative storage medium is coupled to processor, enables a processor to from the storage medium
Information is written to the storage medium in middle reading information.In an alternative, the storage medium can be with processor collection
At together.Pocessor and storage media may reside in ASIC.ASIC may reside in user terminal.It is replaced at one
In scheme, it is resident in the user terminal that pocessor and storage media can be used as discrete assembly.
In one or more exemplary designs, the function can be real in hardware, software, firmware or any combination thereof
It is existing.If realized in software, can be stored in using the function as one or more instruction or code computer-readable
It is transmitted on medium or by computer-readable medium.Computer-readable medium includes computer storage media and communication media,
The communication media includes any medium for helping for computer program to be transmitted to another position from a position.Storage medium
It can be any usable medium that can be accessed by a general purpose or special purpose computer.As an example and not restrictive, the computer
Readable medium may include RAM, ROM, EEPROM, CD-ROM or other optical disc memory apparatus, disk storage equipment or other magnetic
Property storage equipment, or can be used for carry or storage form be instruct or data structure required program code and can
Any other medium accessed by general or specialized computer or general or specialized processor.In addition, any connection is ok
It is properly termed as computer-readable medium.For example, if using coaxial cable, optical fiber cable, twisted pair, digital subscriber line
(DSL) or such as wireless technology of infrared ray, radio and microwave to send software from website, server or other remote sources,
Then above-mentioned coaxial cable, optical fiber cable, twisted pair, DSL or such as wireless technology of infrared ray, radio and microwave are included in
The definition of medium.As used herein, disk and CD include compact disk (CD), laser disk, CD, digital versatile disc
(DVD), floppy disk, Blu-ray disc, wherein disk usually magnetically reproduce data, and CD using laser optics reproduce data.On
The combination for stating content should also be as being included in the range of computer-readable medium.
It is exemplary embodiment disclosed by the invention above, the disclosed sequence of the embodiments of the present invention is just to retouching
It states, does not represent the advantages or disadvantages of the embodiments.It should be noted that the discussion of any of the above embodiment is exemplary only, it is not intended that
Imply that range disclosed by the embodiments of the present invention (including claim) is limited to these examples, what is limited without departing substantially from claim
Under the premise of range, it may be many modifications and modify.According to the claim to a method of open embodiment described herein
Function, step and/or movement are not required to the execution of any particular order.In addition, although element disclosed by the embodiments of the present invention can be with
It is described or is required in the form of individual, but be unless explicitly limited odd number, it is understood that be multiple.
Claims (10)
1. a kind of crystal oscillating circuit characterized by comprising
Crystal oscillator；With
Capacitor array module, the capacitor array module include capacitor array, and the capacitor array and the crystal oscillator are electrically connected,
Wherein, the capacitor array includes multiple capacitor cells, and each of the multiple capacitor cell can be had choosing
It activates to selecting property and adjusts the output frequency of the crystal oscillator to generate different total capacitance values.
2. crystal oscillating circuit according to claim 1, which is characterized in that the capacitor array module further includes decoder, institute
Decoder is stated for receiving activation signal and executing decoded operation to the activation signal to obtain activation command, the capacitor battle array
Capacitor cell in column is selectively activated according to corresponding activation command.
3. crystal oscillating circuit according to claim 2, which is characterized in that the decoder includes line decoder and column decoding
Device,
Wherein, the line decoder is for receiving row active signal and executing decoded operation to the row active signal to obtain row
Activation command activates the capacitor cell of corresponding line,
The column decoder is for receiving column activation signal and executing decoded operation to the column activation signal to obtain column activation
Order the capacitor cell to activate respective column.
4. crystal oscillating circuit according to claim 3, which is characterized in that the row active signal is n-bit binary signal,
And the capacitor array includes 2nRow capacitor cell, wherein n is positive integer, and every a line capacitor cell is swashed by the corresponding row
Signal living activates to control.
5. crystal oscillating circuit according to claim 3, which is characterized in that the column activation signal is m bit binary signal,
And the capacitor array includes 2mColumn capacitance unit, wherein m is positive integer, and each column capacitance unit is swashed by the corresponding column
Signal living activates to control.
6. crystal oscillating circuit according to claim 1, which is characterized in that the multiple capacitor cell is connected using parallel way
It connects.
7. crystal oscillating circuit according to claim 1, which is characterized in that the capacitance of the multiple capacitor cell is successively linear
It is incremented by.
8. crystal oscillating circuit according to claim 1, which is characterized in that the crystal oscillator is that have source crystal oscillator, the capacitor array
It is in parallel with the capacitor of the crystal oscillator.
9. crystal oscillating circuit according to claim 1, which is characterized in that the crystal oscillator is to have source crystal oscillator or without source crystal oscillator.
10. a kind of clock signal generation method, which is characterized in that the described method includes:
The capacitor array of the crystal oscillating circuit of any of claims 1-9 is controlled, according to control signal to generate different frequencies
The clock signal of rate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811295233.3A CN109450378A (en) | 2018-11-01 | 2018-11-01 | A kind of crystal oscillating circuit and clock signal generation method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811295233.3A CN109450378A (en) | 2018-11-01 | 2018-11-01 | A kind of crystal oscillating circuit and clock signal generation method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112800714A (en) * | 2020-12-30 | 2021-05-14 | 科大讯飞股份有限公司 | Printed circuit board design method and related device |
| WO2024078230A1 (en) * | 2022-10-11 | 2024-04-18 | 深圳市中兴微电子技术有限公司 | Crystal oscillator, control method for crystal oscillator, device, and storage medium |
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Application publication date: 20190308 |