CN103457564B - A kind of quartz crystal equivalent circuit - Google Patents
A kind of quartz crystal equivalent circuit Download PDFInfo
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- CN103457564B CN103457564B CN201210169856.2A CN201210169856A CN103457564B CN 103457564 B CN103457564 B CN 103457564B CN 201210169856 A CN201210169856 A CN 201210169856A CN 103457564 B CN103457564 B CN 103457564B
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Abstract
The invention provides a kind of quartz crystal equivalent circuit, described quartz crystal equivalent circuit comprises multiple equivalent branch road be connected in parallel: the first equivalent branch road, the second equivalent branch road ... n-th equivalent branch road, n be greater than 1 integer; Each equivalent branch road described comprises the first electric capacity, the second electric capacity, the first inductance and the first resistance, after described first electric capacity, the first inductance are connected with the first resistant series, is connected with described second Capacitance parallel connection.Quartz crystal equivalent circuit described in the embodiment of the present invention more accurately can embody the characteristic of quartz crystal.
Description
Technical field
The present invention relates to circuit engineering field, relate to a kind of quartz crystal equivalent circuit in particular.
Background technology
Quartz crystal is also called quartz-crystal resonator, and it is the resonant element utilizing the piezoelectric effect of crystal and make, and itself and semiconductor device use together with Resistor-Capacitor Unit, can form quartz oscillator.
When utilizing quartz crystal and analyzing, normally quartz crystal is equivalent to circuit model, then to the process that equivalent electric circuit carries out.Existing quartz crystal equivalent circuit usually as shown in Figure 1.C in equivalent electric circuit
0represent the electrostatic capacitance that crystal cut and metallic plate are formed, its size with crystal, electrode area are relevant.The quality of L and C difference analogue crystals and elasticity.Frictional dissipation resistance when R represents that wafer vibrates.The concrete numerical value of parameter L, C, R, wishes what the nominal frequency value produced was determined according to crystal.
But existing this quartz crystal equivalent circuit can only judge roughly quartz crystal whether starting of oscillation, and period of oscillation, can not accurately embody quartz crystal actual characteristic.And along with the application of quartz crystal more and more extensive, wireless communication frequency is more and more higher, modulation system becomes increasingly complex, requirements at the higher level are proposed to the frequency accuracy of quartz crystal equivalent circuit, therefore, how novelty proposes a kind of quartz crystal equivalent circuit, to improve the accuracy of quartz crystal equivalent circuit, becomes the technical problem that those skilled in the art are in the urgent need to address.
Summary of the invention
In view of this, the invention provides a kind of quartz crystal equivalent circuit, solve the coarse technical problem of existing quartz crystal equivalent circuit.
For achieving the above object, the invention provides following technical scheme:
A kind of quartz crystal equivalent circuit, comprises multiple equivalent branch road be connected in parallel: the first equivalent branch road, the second equivalent branch road ... n-th equivalent branch road, n be greater than 1 integer;
Each equivalent branch road described comprises the first electric capacity, the second electric capacity, the first inductance and the first resistance, after described first electric capacity, the first inductance are connected with the first resistant series, is connected with described second Capacitance parallel connection.
Preferably, described multiple equivalent branch road is used for the different vibration frequencies that equivalence produces quartz crystal.
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 frequency is as required determined.
Preferably, the parameter value of the first electric capacity of each equivalent branch road described, the second electric capacity, the first inductance and the first resistance emulates according to by described quartz crystal equivalent circuit, and test parameter value when producing waveform corresponding to different vibration frequency is determined.
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 circuit, described quartz crystal equivalent circuit comprises multiple equivalent branch road be connected in parallel: the first equivalent branch road, the second equivalent branch road ... n-th equivalent branch road, n be greater than 1 integer; Each equivalent branch road described comprises the first electric capacity, the second electric capacity, the first inductance and the first resistance, after described first electric capacity, the first inductance are connected with the first resistant series, is connected with described second Capacitance parallel connection.Quartz crystal equivalent circuit described in the embodiment of the present invention, can not only produce different vibration frequencies, makes it possible to the actual resonance characteristic accurately embodying quartz crystal.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
Fig. 1 is the quartz crystal equivalent circuit structural representation of prior art;
Fig. 2 is the structural representation of a kind of quartz crystal equivalent circuit of the present invention embodiment;
Fig. 3 is the structural representation of a kind of quartz crystal equivalent circuit of the present invention embodiment;
Fig. 4 is the structural representation of a kind of another embodiment of quartz crystal equivalent circuit of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The embodiment of the invention discloses a kind of quartz crystal equivalent circuit, described quartz crystal equivalent circuit comprises multiple equivalent branch road be connected in parallel: the first equivalent branch road, the second equivalent branch road ... n-th equivalent branch road, n be greater than 1 integer; Each equivalent branch road described comprises the first electric capacity, the second electric capacity, the first inductance and the first resistance, after described first electric capacity, the first inductance are connected with the first resistant series, is connected with described second Capacitance parallel connection.Quartz crystal equivalent circuit described in the embodiment of the present invention, can produce different vibration frequencies, makes it possible to the actual resonance characteristic accurately embodying quartz crystal.
See Fig. 2, for the structural representation of a kind of quartz crystal equivalent circuit embodiment 1 of the present invention, described quartz crystal equivalent circuit can comprise the multiple equivalent branch road of equivalent branch road 100: the first, the second equivalent branch road that are connected in parallel ... n-th equivalent branch road, wherein, n be greater than 1 integer.
Wherein, each components and parts included by equivalent branch road is identical, the first electric capacity, the second electric capacity, the first inductance and the first resistance can be comprised in each equivalent branch road, after described first electric capacity, the first inductance are connected with the first resistant series, be connected with described second Capacitance parallel connection.
Such as from Fig. 2, the first equivalent branch road comprises the first electric capacity C1
0, the second electric capacity C1, the first inductance L 1 and the first resistance R1, the second equivalent branch road comprises the first electric capacity C2
0, the second electric capacity C2, the second inductance L 2 and the second resistance R2 ... n-th equivalent branch road comprises the first electric capacity Cn
0, the second electric capacity Cn, the second inductance L n and the second resistance Rn, wherein n be greater than 1 integer.
Described multiple equivalent branch road is used for the different vibration frequencies that equivalence produces quartz crystal.
Because existing quartz crystal equivalent circuit can only produce fundamental frequency or the harmonic frequency of quartz crystal, and in side circuit application and in 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 multiple equivalent branch road, equivalence can produce the different vibration frequencies incessantly comprising 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, mechanical oscillation can be produced when the effect being subject to applied alternating field, therefore quartz crystal can be equivalent to 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.The frequency of such as triple-frequency harmonics is three times of fundamental frequency, nine times that the frequency of quintuple harmonics is five times of fundamental frequency, the frequency of the seventh harmonic is seven times of fundamental frequency, the frequency of nine subharmonic is fundamental frequency, the like.
Overtone refers to that frequency equals the component sine waves of the approximate integral multiple (not being integral multiple) of fundamental frequency.Such as third harmonic frequencies is 3 times of fundamental frequency, then three overtone frequencies can be 2.5 times (allowing to there is error within the specific limits) of fundamental frequency.Overtone vibration has three overtones, fifth overtone, seven overtones etc. usually.
Described first error range refers to and is greater than described harmonic frequency first predetermined value, and is less than the frequency range of described harmonic frequency second predetermined value.Described first predetermined value and the second predetermined value are determined according to the applicable cases to quartz crystal, such as a certain quartz-like crystal can produce the fundamental frequency of 26MHz (megahertz), its third harmonic frequencies is 78MHz, this first predetermined value and the second predetermined value are 5MHz, then described approximate harmonic frequency can be the frequency within the scope of 73MHz ~ 83MHz.Concrete described approximate harmonic frequency can be greater than the frequency of harmonic frequency first predetermined value or be less than the frequency of harmonic frequency second predetermined value.First predetermined value and the second predetermined value can be determined according to different practical situations.
Described second error range refers to that finger is greater than described overtone frequency the 3rd predetermined value, is less than the frequency range of described overtone frequency the 4th predetermined value.Described 3rd predetermined value and the 4th tentation data are determined according to the applicable cases to quartz crystal, such as a certain quartz-like crystal can produce the fundamental frequency of 26MHz (megahertz), its three overtone frequencies are 76.5MHz, 3rd predetermined value is 0.5MHz, 4th predetermined value is 0.8MHz, then three approximate overtone frequencies can be the frequencies within the scope of 76MHz ~ 77.3MHz.Concrete described approximate overtone frequency can be greater than the frequency of harmonic frequency the 3rd predetermined value or be less than the frequency of harmonic frequency the 4th predetermined value.3rd predetermined value and the 4th predetermined value can be determined according to different practical situations.
In quartz crystal equivalent circuit, the number of equivalent branch road is that the number of different vibration frequencies that described quartz crystal produces as required is determined.Wherein, the first equivalent branch road can be identical with existing equivalent circuit structure, and it equivalence can produce fundamental frequency or harmonic frequency, but can not produce overtone frequency, approximate harmonic frequency or approximate overtone frequency.Therefore after other each the equivalent branch roads not comprising described first equivalent branch road in the present embodiment are connected with described first equivalent branch road, equivalence can generate overtone frequency, approximate harmonic frequency, approximate overtone frequency, wherein overtone frequency can comprise three overtone frequencies, fifth overtone frequencies 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.
Such as, if need three of quartz crystal overtone frequencies, three approximate harmonic frequencies or three approximate overtone frequencies, then described equivalent branch road specifically can comprise the first equivalent branch road and the second equivalent branch road.Second equivalent branch road can produce three overtone frequencies, three approximate harmonic frequencies or three approximate overtone frequencies after being connected with the first equivalent branch road.
If need three overtone frequencies, fifth overtone frequency, the first harmonic frequency of quartz crystal, then described equivalent branch road specifically can comprise the first equivalent branch road, the second equivalent branch road, the 3rd equivalent branch road and the 4th equivalent branch road.Second equivalent branch road, the 3rd equivalent branch road and the 4th equivalent branch road can be respectively used to generation three overtone frequencies, fifth overtone frequency and first harmonic frequency.
Concrete see Fig. 3, be another example structure schematic diagram of quartz crystal equivalent circuit of the present invention, comprise two equivalent branch roads, Fig. 4 is the structural representation of another embodiment of quartz crystal equivalent 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 emulates according to by described quartz crystal equivalent circuit, and test parameter value when producing waveform corresponding to different vibration frequency is determined.
Circuit simulation test is carried out by described quartz crystal equivalent circuit, in simulation process, by adjusting the parameter value of each components and parts, make quartz crystal equivalent circuit can produce first-harmonic vibration, harmonic vibration, overtone vibration, approximate harmonic vibration or the vibration of approximate overtone.Approximate harmonic vibration refers to the vibration that approximate harmonic frequency point is corresponding, and approximate overtone vibration refers to the vibration that approximate overtone frequency point is corresponding.
In actual applications, a special applications is in broadband character, and what affect signal output quality is not first-harmonic characteristic, but the characteristic near three overtones or three overtones, near triple-frequency harmonics.Therefore quartz crystal can be equivalent to equivalent electric circuit as shown in Figure 3, and then this equivalent electric circuit is emulated, determine component parameter value during waveform corresponding to generation three overtone frequencies, three approximate overtone frequencies or three approximate harmonic frequencies.This can be determined the equivalent electric circuit of equivalent electric circuit as quartz crystal of concrete device parameters value, accurately can embody the characteristic of quartz crystal.
By the quartz crystal equivalent circuit described in the embodiment of the present invention, fundamental frequency and harmonic frequency can not only be produced, other different vibration frequencies of quartz crystal can be produced simultaneously, thus accurately can embody the characteristic of quartz crystal.Share at quartz crystal and other components and parts, when forming quartz oscillator, when needing to produce larger frequency of oscillation, also can not affect the signal quality that oscillator exports, meeting 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 the difference with other embodiments, between each embodiment identical similar portion mutually see.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (5)
1. a quartz crystal equivalent circuit, is characterized in that, comprises multiple equivalent branch road be connected in parallel: the first equivalent branch road, the second equivalent branch road ... n-th equivalent branch road, n be greater than 1 integer;
Each equivalent branch road described comprises the first electric capacity, the second electric capacity, the first inductance and the first resistance, after described first electric capacity, the first inductance are connected with the first resistant series, is connected with described second Capacitance parallel connection;
Described multiple equivalent branch road is used for the different vibration frequencies that equivalence produces quartz crystal.
2. equivalent electric circuit according to claim 1, 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.
3. equivalent electric circuit according to claim 1, is characterized in that, the described equivalent branch road number number that described quartz crystal produces different vibration frequency is as required determined.
4. equivalent electric circuit according to claim 1, it is characterized in that, the parameter value of the first electric capacity of each equivalent branch road described, the second electric capacity, the first inductance and the first resistance emulates according to by described quartz crystal equivalent circuit, and test parameter value when producing waveform corresponding to different vibration frequency is determined.
5. 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, fundamental frequency and the harmonic frequency of quartz crystal is produced 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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| CN201210169856.2A CN103457564B (en) | 2012-05-28 | 2012-05-28 | A kind of quartz crystal equivalent circuit |
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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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| CN103457564B true 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 |
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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 |
|---|
| 并联型石英晶体正弦波振荡电路的频率探讨;包常明;《内蒙古民族大学学报( 自然科学版)》;20041231;全文 * |
| 石英晶体多路微天平等效电路和相关实验研究;吴卅建等;《实验力学》;20030930;第419-425页 * |
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