CN109714050A - The method for needing frequency accuracy is obtained in decimal frequency divider - Google Patents
The method for needing frequency accuracy is obtained in decimal frequency divider Download PDFInfo
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- CN109714050A CN109714050A CN201811599912.XA CN201811599912A CN109714050A CN 109714050 A CN109714050 A CN 109714050A CN 201811599912 A CN201811599912 A CN 201811599912A CN 109714050 A CN109714050 A CN 109714050A
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000004590 computer program Methods 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 claims 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
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- 238000003786 synthesis reaction Methods 0.000 description 1
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Abstract
The invention discloses the method for needing frequency accuracy is obtained in a kind of decimal frequency divider.The method for needing frequency accuracy is obtained in a kind of decimal frequency divider of the present invention, comprising: the output of decimal frequency divider VCO is expressed as follows formula:Wherein, N: decimal frequency divider integer part；Fnum: decimal frequency divider molecular moiety；Fden: decimal frequency divider denominator part；Fpd: phase demodulation frequency；Reach required frequency accuracy, as long as making
Description
Technical field
The present invention relates to digital fields, and in particular to the method for needing frequency accuracy is obtained in a kind of decimal frequency divider.
Background technique
Frequency divider is a kind of using very extensive circuit, and function is the signal frequency split to upper frequency, to obtain
The low frequency signal needed.In practical application, required frequency division coefficient may be integer or decimal.The realization of integral frequency divisioil is compared
Simply, counter chip can be used or use Design for Programmable Logic
In modern electronic system design, ratio shared by digital electronic system is increasing, contemporary electronic systems development
Trend be digitlization and it is integrated.And in digital display circuit, clock is the basic guarantee of each module cooperative work, especially timing
Digital display circuit, no clock are had no way of work at all.In Design of Digital System, it is frequently necessary to carry out different multiples to reference clock
Frequency dividing and clock frequency needed for obtaining each module, frequency divider is one of most common basic circuit in Design of Digital System.
Digital frequency divider generally has two classes: one kind is the equally distributed frequency divider of impulse waveform, i.e. Conventional frequency dividers；Another kind of is pulse
The frequency divider of waveform uneven distribution.Conventional frequency dividers can only generally carry out integral multiple frequency dividing, and dividing multiple must be even number.But
In certain occasions, clock source and required frequency just need the non-uniform frequency divider of waveform not at even multiples relationship at this time, this
Kind frequency divider is in addition to it can carry out integral multiple frequency dividing, moreover it is possible to small several times frequency dividing is carried out, it is defeated so as to obtain relatively continuous frequency
Out, it can be applied in many digital display circuits, such as the frequency control of output waveform and stepper motor in direct digital synthesis technique
The control etc. of middle revolving speed.
There are following technical problems for traditional technology:
Many manufacturers, which provide, at present is integrated with the commercial IC of the low noise wideband radio frequency PLL of VCO, supports integer and decimal
Frequency dividing.
Summary of the invention
The technical problem to be solved in the present invention is to provide obtain to need frequency accuracy in a kind of simple decimal frequency divider
Method.
In order to solve the above-mentioned technical problems, the present invention provides the side for needing frequency accuracy is obtained in a kind of decimal frequency divider
Method, comprising: the output of decimal frequency divider VCO is expressed as follows formula:
Wherein,
N: decimal frequency divider integer part；
Fnum: decimal frequency divider molecular moiety；
Fden: decimal frequency divider denominator part；
Fpd: phase demodulation frequency；
Reach required frequency accuracy, as long as making
A kind of computer equipment can be run on a memory and on a processor including memory, processor and storage
The step of computer program, the processor realizes any one the method when executing described program.
A kind of computer readable storage medium, is stored thereon with computer program, realization when which is executed by processor
The step of any one the method.
A kind of processor, the processor is for running program, wherein described program executes described in any item when running
Method.
Beneficial effects of the present invention:
Decimal point can be determined in conjunction with phase demodulation frequency according to the frequency stepping accuracy of system requirements by providing a kind of straightforward procedure
Frequency division mother setting value meets system requirements.
Specific embodiment
The present invention is further explained in the light of specific embodiments, so that those skilled in the art can be preferably
Understand the present invention and can be practiced, but illustrated embodiment is not as a limitation of the invention.
The output of VCO can be expressed as follows formula 1:
Wherein
N: decimal frequency divider integer part；
Fnum: decimal frequency divider molecular moiety；
Fden: decimal frequency divider denominator part；
Fpd: phase demodulation frequency；
Reach required frequency accuracy, as long as making
Such as it is required to meet 0.1Hz precision, if Fpd=100MHz (108), then Fden=109?；
Such as it is required to meet 0.05Hz precision, if Fpd=100MHz (108), then Fden=2*109?.
The problem of decimal carry integer is needed to pay attention in use.
Embodiment described above is only to absolutely prove preferred embodiment that is of the invention and being lifted, protection model of the invention
It encloses without being limited thereto.Those skilled in the art's made equivalent substitute or transformation on the basis of the present invention, in the present invention
Protection scope within.Protection scope of the present invention is subject to claims.
Claims (4)
1. obtaining the method for needing frequency accuracy in a kind of decimal frequency divider characterized by comprising decimal frequency divider VCO's
Output is expressed as follows formula:
Wherein,
N: decimal frequency divider integer part；
Fnum: decimal frequency divider molecular moiety；
Fden: decimal frequency divider denominator part；
Fpd: phase demodulation frequency；
Reach required frequency accuracy, as long as making
2. a kind of computer equipment including memory, processor and stores the meter that can be run on a memory and on a processor
Calculation machine program, which is characterized in that the step of processor realizes claim 1 the method when executing described program.
3. a kind of computer readable storage medium, is stored thereon with computer program, which is characterized in that the program is held by processor
The step of claim 1 the method is realized when row.
4. a kind of processor, which is characterized in that the processor is for running program, wherein right of execution when described program is run
Benefit requires 1 described in any item methods.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811599912.XA CN109714050B (en) | 2018-12-26 | 2018-12-26 | Method for obtaining required frequency precision in fractional frequency divider |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811599912.XA CN109714050B (en) | 2018-12-26 | 2018-12-26 | Method for obtaining required frequency precision in fractional frequency divider |
Publications (2)
| Publication Number | Publication Date |
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| CN109714050A true CN109714050A (en) | 2019-05-03 |
| CN109714050B CN109714050B (en) | 2024-02-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811599912.XA Active CN109714050B (en) | 2018-12-26 | 2018-12-26 | Method for obtaining required frequency precision in fractional frequency divider |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1304804A2 (en) * | 2001-10-10 | 2003-04-23 | STMicroelectronics Pvt. Ltd | Fractional divider |
| JP2004236193A (en) * | 2003-01-31 | 2004-08-19 | Toshiba Corp | Fraction frequency divider, television receiver, integrated circuit for video signal, and fraction frequency divider method |
| CN101272142A (en) * | 2008-05-20 | 2008-09-24 | 曹秀娟 | Frequency synthesizer |
| CN104184461A (en) * | 2014-08-20 | 2014-12-03 | 上海交通大学 | Fractional frequency divider |
| CN105406864A (en) * | 2015-12-31 | 2016-03-16 | 陕西烽火电子股份有限公司 | Wide-band high-speed frequency hopping frequency synthesizer and working method thereof |
| CN105652660A (en) * | 2016-01-07 | 2016-06-08 | 北京北广科技股份有限公司 | Single-chip microcomputer-based method for acquiring crossover frequency control word |
-
2018
- 2018-12-26 CN CN201811599912.XA patent/CN109714050B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1304804A2 (en) * | 2001-10-10 | 2003-04-23 | STMicroelectronics Pvt. Ltd | Fractional divider |
| JP2004236193A (en) * | 2003-01-31 | 2004-08-19 | Toshiba Corp | Fraction frequency divider, television receiver, integrated circuit for video signal, and fraction frequency divider method |
| CN101272142A (en) * | 2008-05-20 | 2008-09-24 | 曹秀娟 | Frequency synthesizer |
| CN104184461A (en) * | 2014-08-20 | 2014-12-03 | 上海交通大学 | Fractional frequency divider |
| CN105406864A (en) * | 2015-12-31 | 2016-03-16 | 陕西烽火电子股份有限公司 | Wide-band high-speed frequency hopping frequency synthesizer and working method thereof |
| CN105652660A (en) * | 2016-01-07 | 2016-06-08 | 北京北广科技股份有限公司 | Single-chip microcomputer-based method for acquiring crossover frequency control word |
Non-Patent Citations (4)
| Title |
|---|
| 贾素梅等: "基于HMC983+HMC984套片的频率综合器的设计与实现", 《河北工业大学学报》 * |
| 贾素梅等: "基于HMC983+HMC984套片的频率综合器的设计与实现", 《河北工业大学学报》, no. 02, 30 April 2015 (2015-04-30), pages 18 * |
| 郭桂良等: "一种新型小数/整数分频器", 《微电子学》 * |
| 郭桂良等: "一种新型小数/整数分频器", 《微电子学》, no. 03, 20 June 2008 (2008-06-20) * |
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| CN109714050B (en) | 2024-02-20 |
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