CN103457564A - Quartz crystal equivalent circuit - Google Patents
Quartz crystal equivalent circuit Download PDFInfo
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- CN103457564A CN103457564A CN2012101698562A CN201210169856A CN103457564A CN 103457564 A CN103457564 A CN 103457564A CN 2012101698562 A CN2012101698562 A CN 2012101698562A CN 201210169856 A CN201210169856 A CN 201210169856A CN 103457564 A CN103457564 A CN 103457564A
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Abstract
The invention provides a quartz crystal equivalent circuit which comprises a plurality of equivalent branch circuits. The equivalent branch circuits are connected with one another in parallel and include a first equivalent branch circuit, a second equivalent branch circuit,..., and an n<th> equivalent branch circuit, and the n is an integer larger than 1; each equivalent branch circuit comprises a first capacitor, a second capacitor, a first inductor and a first resistor, and each first capacitor, the corresponding first inductor and the corresponding first resistor are serially connected with one another and then are connected with the corresponding second capacitor in parallel. The quartz crystal equivalent circuit in an embodiment of the invention has the advantage that characteristics of quartz crystals can be accurately embodied by the quartz crystal equivalent circuit.
Description
Technical field
The present invention relates to the circuit engineering field, relate in particular a kind of quartz crystal equivalent electric circuit.
Background technology
Quartz crystal is called again quartz-crystal resonator, and it is to utilize the piezoelectric effect of crystal and the resonant element made, and it uses together with Resistor-Capacitor Unit with semiconductor device, can form quartz oscillator.
To quartz crystal utilization and analysis the time, normally quartz crystal is equivalent to circuit model, the processing of then equivalent electric circuit being carried out.Existing quartz crystal equivalent electric circuit usually as shown in Figure 1.C in equivalent electric circuit
0mean the electrostatic capacitance that crystal cut and metallic plate form, its size, electrode area with crystal is relevant.L and C be quality and the elasticity of analogue crystals respectively.Frictional dissipation resistance when R means the wafer vibration.The concrete numerical value of parameter L, C, R, wish what the nominal frequency value of generation was determined according to crystal.
But existing this quartz crystal equivalent electric circuit can only be judged roughly whether starting of oscillation of quartz crystal, and period of oscillation, can not accurately embody the quartz crystal actual characteristic.And along with the application of quartz crystal is more and more extensive, wireless communication frequency is more and more higher, modulation system becomes increasingly complex, frequency accuracy to the quartz crystal equivalent electric circuit proposes requirements at the higher level, therefore, a kind of quartz crystal equivalent electric circuit of Innovation proposition, to improve the accuracy of quartz crystal equivalent electric circuit, become those skilled in the art's technical problem in the urgent need to address.
Summary of the invention
In view of this, the invention provides a kind of quartz crystal equivalent electric circuit, solved the coarse technical problem of existing quartz crystal equivalent electric circuit.
For achieving the above object, the invention provides following technical scheme:
A kind of quartz crystal equivalent electric circuit comprises a plurality of equivalent branch roads that are connected in parallel: the first equivalent branch road, the second equivalent branch road ... n equivalence branch road, n is greater than 1 integer;
Described each equivalent branch road comprises the first electric capacity, the second electric capacity, the first inductance and the first resistance, after described the first electric capacity, the first inductance and the first resistance are connected in series, with described the second Capacitance parallel connection, is connected.
Preferably, described a plurality of equivalent branch road produces the different vibration frequencies of quartz crystal for equivalence.
Preferably, described different vibration frequency comprises fundamental frequency, harmonic frequency, overtone frequency, approximate harmonic frequency and/or approximate overtone frequency, described approximate harmonic frequency is the frequency of described harmonic frequency in the first error range, and described approximate overtone frequency is the frequency of described overtone frequency in the second error range.
Preferably, the described equivalent branch road number number that described quartz crystal produces different vibration frequencies is as required determined.
Preferably, the parameter value of the first electric capacity of described each equivalent branch road, the second electric capacity, the first inductance and the first resistance is according to described quartz crystal equivalent electric circuit is carried out to emulation, the test parameter value while producing waveform corresponding to different vibration frequencies and definite.
Preferably, specifically comprise the first equivalent branch road and the second equivalent branch road, produce fundamental frequency and three overtone frequencies, three approximate harmonic frequencies or three approximate overtone frequencies of quartz crystal for equivalence.
Known via above-mentioned technical scheme, compared with prior art, the invention provides a kind of quartz crystal equivalent electric circuit, described quartz crystal equivalent electric circuit comprises a plurality of equivalent branch roads that are connected in parallel: the first equivalent branch road, the second equivalent branch road ... n equivalence branch road, and n is greater than 1 integer; Described each equivalent branch road comprises the first electric capacity, the second electric capacity, the first inductance and the first resistance, after described the first electric capacity, the first inductance and the first resistance are connected in series, with described the second Capacitance parallel connection, is connected.The described quartz crystal equivalent electric circuit of the embodiment of the present invention, not only can produce different vibration frequencies, makes it possible to accurately embody the actual resonance characteristic of quartz crystal.
The accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below will the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to the accompanying drawing provided other accompanying drawing.
The quartz crystal equivalent circuit structure schematic diagram that Fig. 1 is prior art;
The structural representation that Fig. 2 is an embodiment of a kind of quartz crystal equivalent electric circuit of the present invention;
The structural representation that Fig. 3 is an embodiment of a kind of quartz crystal equivalent electric circuit of the present invention;
The structural representation that Fig. 4 is another embodiment of a kind of quartz crystal equivalent electric circuit of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making under the creative work prerequisite the every other embodiment obtained, belong to the scope of protection of the invention.
The embodiment of the invention discloses a kind of quartz crystal equivalent electric circuit, described quartz crystal equivalent electric circuit comprises a plurality of equivalent branch roads that are connected in parallel: the first equivalent branch road, the second equivalent branch road ... n equivalence branch road, n is greater than 1 integer; Described each equivalent branch road comprises the first electric capacity, the second electric capacity, the first inductance and the first resistance, after described the first electric capacity, the first inductance and the first resistance are connected in series, with described the second Capacitance parallel connection, is connected.The described quartz crystal equivalent electric circuit of the embodiment of the present invention, can produce different vibration frequencies, makes it possible to accurately embody the actual resonance characteristic of quartz crystal.
Referring to Fig. 1, structural representation for a kind of quartz crystal equivalent electric circuit of the present invention embodiment 1, described quartz crystal equivalent electric circuit can comprise 100: the first equivalent branch roads of a plurality of equivalent branch roads that are connected in parallel, the second equivalent branch road ... n equivalence branch road, wherein, n is greater than 1 integer.
Wherein, the included components and parts of each equivalent branch road are identical, can comprise the first electric capacity, the second electric capacity, the first inductance and the first resistance in each equivalent branch road, after described the first electric capacity, the first inductance and the first resistance are connected in series, be connected with described the second Capacitance parallel connection.
For example known in Fig. 1, the first equivalent branch road comprises the first capacitor C 1
0, the second capacitor C 1, the first inductance L 1 and the equivalent branch road of the first resistance R 1, the second comprise the first capacitor C 2
0, the second capacitor C 2, the second inductance L 2 and the second resistance R 2 ... n equivalence branch road comprises the first capacitor C n
0, the second capacitor C n, the second inductance L n and the second resistance R n, wherein n is greater than 1 integer.
Described a plurality of equivalent branch road produces the different vibration frequencies of quartz crystal for equivalence.
Because existing quartz crystal equivalent electric circuit can only produce fundamental frequency or the harmonic frequency of quartz crystal, and, in the side circuit application and analyzing, affecting having more than of circuit output signal quality is fundamental frequency or harmonic frequency.Therefore the equivalent electric circuit in this enforcement comprises a plurality of equivalent branch roads, can equivalence produce the different vibration frequencies that incessantly comprise fundamental frequency and harmonic frequency.
Described different vibration frequency can comprise fundamental frequency, harmonic frequency, overtone frequency, approximate harmonic frequency and/or approximate overtone frequency.Described approximate harmonic frequency is the frequency of described harmonic frequency in the first error range, and described approximate overtone frequency is the frequency of described overtone frequency in the second error range.
Because quartz crystal is a kind of resonant element, can produce mechanical oscillation in the used time of doing that is subject to applied alternating field, therefore quartz crystal can be equivalent to the electromagnetic resonance loop, and the mechanical oscillation of quartz crystal are a kind of periodic swingings of complexity, vibration mode comprises first-harmonic and harmonic wave.
Harmonic wave refers to that frequency equals the component sine waves of the integral multiple of fundamental frequency.For example the frequency of triple-frequency harmonics is fundamental frequency three times, the frequency of quintuple harmonics is fundamental frequency five times, the frequency of the seventh harmonic are fundamental frequency seven times, the frequency of nine subharmonic are fundamental frequency nine times, the like.
Overtone refers to that frequency equals the component sine waves of the approximate integral multiple of fundamental frequency (not being integral multiple).For example third harmonic frequencies is fundamental frequency 3 times, and three overtone frequencies can be 2.5 times (allowing to exist within the specific limits error) of fundamental frequency.Overtone vibration has three overtones, fifth overtone, seven overtones etc. usually.
Described the first error range refers to and is greater than described harmonic frequency the first predetermined value, and the frequency range that is less than described harmonic frequency the second predetermined value.Described the first predetermined value and the second predetermined value are according to the applicable cases of quartz crystal is determined, for example a certain quartz-like crystal can produce the 26MHz(megahertz) fundamental frequency, its third harmonic frequencies is 78MHz, this first predetermined value and the second predetermined value are 5MHz, and described approximate harmonic frequency can be the frequency in 73MHz ~ 83MHz scope.Concrete described approximate harmonic frequency can be the frequency that is greater than the frequency of harmonic frequency the first predetermined value or is less than harmonic frequency the second predetermined value.The first predetermined value and the second predetermined value can be determined according to different practical situations.
Described the second error range refers to and refers to be greater than described overtone frequency the 3rd predetermined value, is less than the frequency range of described overtone frequency the 4th predetermined value.Described the 3rd predetermined value and the 4th tentation data are according to the applicable cases of quartz crystal is determined, for example a certain quartz-like crystal can produce the 26MHz(megahertz) fundamental frequency, its three overtone frequencies are 76.5MHz, the 3rd predetermined value is 0.5MHz, the 4th predetermined value is 0.8MHz, and three approximate overtone frequencies can be the frequencies in 76MHz ~ 77.3MHz scope.Concrete described approximate overtone frequency can be the frequency that is greater than the frequency of harmonic frequency the 3rd predetermined value or is less than harmonic frequency the 4th predetermined value.The 3rd predetermined value and the 4th predetermined value can be determined according to different practical situations.
In the quartz crystal equivalent electric circuit, the number of equivalent branch road is that the number of the different vibration frequencies that described quartz crystal produces is as required determined.Wherein, the first equivalent branch road can be identical with existing equivalent circuit structure, and it can equivalence produce fundamental frequency or harmonic frequency, but can not produce overtone frequency, approximate harmonic frequency or approximate overtone frequency.Therefore other each equivalent branch roads that do not comprise described the first equivalent branch road in the present embodiment are with after the described first equivalent branch road is connected, can equivalence generate overtone frequency, approximate harmonic frequency, approximate overtone frequency, wherein overtone frequency can comprise three overtone frequencies, fifth overtone frequency etc.; Approximate harmonic frequency can comprise first approximation harmonic frequency, second approximation harmonic frequency etc.; Approximate overtone frequency can comprise three approximate overtone frequencies, five approximate overtone frequencies, seven approximate overtone frequencies etc.
For example, if need three overtone frequencies of quartz crystal, three approximate harmonic frequencies or three approximate overtone frequencies, described equivalent branch road can specifically comprise the first equivalent branch road and the second equivalent branch road.The second equivalent branch road with can produce three overtone frequencies, three approximate harmonic frequencies or three approximate overtone frequencies after the first equivalent branch road is connected.
If need three overtone frequencies, fifth overtone frequency, the first harmonic frequency of quartz crystal, described equivalent branch road can specifically comprise the first equivalent branch road, the second equivalent branch road, C grade effect branch road and fourth class effect branch road.The second equivalent branch road, C grade effect branch road and fourth class effect branch road can be respectively used to produce overtone frequency, fifth overtone frequency and first harmonic frequency three times.
Concrete referring to Fig. 3, another example structure schematic diagram for quartz crystal equivalent electric circuit of the present invention, comprise two equivalent branch roads, and the structural representation that Fig. 4 is another embodiment of quartz crystal equivalent electric circuit of the present invention comprises three equivalent branch roads.
Wherein, the parameter value of each components and parts of the first electric capacity of each equivalent branch road, the second electric capacity, the first inductance and the first resistance is according to described quartz crystal equivalent electric circuit is carried out to emulation, the test parameter value while producing waveform corresponding to different vibration frequencies and definite.
Be about to described quartz crystal equivalent electric circuit and carry out the circuit simulation test, in simulation process, by adjusting the parameter value of each components and parts, make the quartz crystal equivalent electric circuit can produce first-harmonic vibration, harmonic vibration, overtone vibration, approximate harmonic vibration or the vibration of approximate overtone.Approximate harmonic vibration refers to that being similar to harmonic frequency puts corresponding vibration, and approximate overtone vibration refers to that being similar to overtone frequency puts corresponding vibration.
In actual applications, a special applications is in broadband character, and what affect the signal output quality is not the first-harmonic characteristic, but near three overtones or three overtones, near characteristic triple-frequency harmonics.Therefore quartz crystal can be equivalent to equivalent electric circuit as shown in Figure 3, and then this equivalence circuit is carried out to emulation, determine the component parameter value while producing three overtone frequencies, three approximate overtone frequencies or waveform corresponding to three approximate harmonic frequencies.This can be determined to the equivalent electric circuit of the equivalent electric circuit of concrete device parameters value as quartz crystal, can accurately embody the characteristic of quartz crystal.
By the described quartz crystal equivalent electric circuit of the embodiment of the present invention, not only can produce fundamental frequency and harmonic frequency, can produce other different vibration frequencies of quartz crystal, thereby can accurately embody the characteristic of quartz crystal simultaneously.Share at quartz crystal and other components and parts, while forming quartz oscillator, when needs produce larger frequency of oscillation, also can not affect the signal quality of oscillator output, met application demand, make circuit analysis more accurate.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is and the difference of other embodiment that between each embodiment, identical similar part is mutually referring to getting final product.
To the above-mentioned explanation of the disclosed embodiments, make professional and technical personnel in the field can realize or use the present invention.Multiple modification to these embodiment will be apparent for those skilled in the art, and General Principle as defined herein can be in the situation that do not break away from the spirit or scope of the present invention, realization in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (6)
1. a quartz crystal equivalent electric circuit, is characterized in that, comprises a plurality of equivalent branch roads that are connected in parallel: the first equivalent branch road, the second equivalent branch road ... n equivalence branch road, n is greater than 1 integer;
Described each equivalent branch road comprises the first electric capacity, the second electric capacity, the first inductance and the first resistance, after described the first electric capacity, the first inductance and the first resistance are connected in series, with described the second Capacitance parallel connection, is connected.
2. equivalent electric circuit according to claim 1, is characterized in that, described a plurality of equivalent branch roads produce the different vibration frequencies of quartz crystal for equivalence.
3. equivalent electric circuit according to claim 2, it is characterized in that, described different vibration frequency comprises fundamental frequency, harmonic frequency, overtone frequency, approximate harmonic frequency and/or approximate overtone frequency, described approximate harmonic frequency is the frequency of described harmonic frequency in the first error range, and described approximate overtone frequency is the frequency of described overtone frequency in the second error range.
4. equivalent electric circuit according to claim 2, is characterized in that, the described equivalent branch road number number that described quartz crystal produces different vibration frequencies is as required determined.
5. equivalent electric circuit according to claim 2, it is characterized in that, the parameter value of the first electric capacity of described each equivalent branch road, the second electric capacity, the first inductance and the first resistance is according to described quartz crystal equivalent electric circuit is carried out to emulation, the test parameter value while producing waveform corresponding to different vibration frequencies and definite.
6. equivalent electric circuit according to claim 1, it is characterized in that, specifically comprise the first equivalent branch road and the second equivalent branch road, produce fundamental frequency and the harmonic frequency of quartz crystal for equivalence, and three overtone frequencies, three approximate harmonic frequencies or three approximate overtone frequencies, described three approximate harmonic frequencies are the frequency of described third harmonic frequencies in the first error range, and described three approximate overtone frequencies are the frequencies of described three overtone frequencies in the second error range.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210169856.2A CN103457564B (en) | 2012-05-28 | 2012-05-28 | A kind of quartz crystal equivalent circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210169856.2A CN103457564B (en) | 2012-05-28 | 2012-05-28 | A kind of quartz crystal equivalent circuit |
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| CN103457564A true CN103457564A (en) | 2013-12-18 |
| CN103457564B CN103457564B (en) | 2016-04-27 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2692919Y (en) * | 2003-10-11 | 2005-04-13 | 淄博金里电子有限公司 | Vacuum type quartz crystal oscillating frequency micro-modulator |
| KR20080013579A (en) * | 2006-08-09 | 2008-02-13 | 삼성전자주식회사 | Band pass filter |
-
2012
- 2012-05-28 CN CN201210169856.2A patent/CN103457564B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2692919Y (en) * | 2003-10-11 | 2005-04-13 | 淄博金里电子有限公司 | Vacuum type quartz crystal oscillating frequency micro-modulator |
| KR20080013579A (en) * | 2006-08-09 | 2008-02-13 | 삼성전자주식회사 | Band pass filter |
Non-Patent Citations (2)
| Title |
|---|
| 包常明: "并联型石英晶体正弦波振荡电路的频率探讨", 《内蒙古民族大学学报( 自然科学版)》 * |
| 吴卅建等: "石英晶体多路微天平等效电路和相关实验研究", 《实验力学》 * |
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