CN204721314U - A kind of high-frequency constant temperature crystal oscillator - Google Patents
A kind of high-frequency constant temperature crystal oscillator Download PDFInfo
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- CN204721314U CN204721314U CN201520406931.1U CN201520406931U CN204721314U CN 204721314 U CN204721314 U CN 204721314U CN 201520406931 U CN201520406931 U CN 201520406931U CN 204721314 U CN204721314 U CN 204721314U
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Abstract
The utility model relates to crystal oscillator technologies field, disclose a kind of high-frequency constant temperature crystal oscillator, it is mainly used in solving in prior art, and the parallel connection type Pi Lesi of employing transistor or Kolpitts oscillating circuit are designing the limitation and shortcoming problem of producing and bring in use for the quartz oscillation crystal used five times in high frequency oscillation device or higher overtone is secondary.High-frequency constant temperature crystal oscillator of the present utility model comprises crystal oscillating circuit, and described crystal oscillating circuit comprises chip, oscillating crystal, variable capacitance diode, first to fourth inductance, the first to the 8th electric capacity, the first to the 5th resistance.The utility model is in main vibration circuit, by the integrated chip of function admirable, higher overtone oscillating crystal and other auxiliary element are connected, form the reliable high-frequency oscillating circuits of high stable, it has, and control is sensitive, component number is few, production technology is simple, high reliability.
Description
Technical field
The utility model relates to crystal oscillator technologies field, particularly relates to a kind of high-frequency constant temperature crystal oscillator.
Background technology
At present, the constant-temperature crystal oscillator in industry is all generally the parallel connection type Pi Lesi or the Kolpitts oscillating circuit that adopt transistor, and this oscillating circuit affects less when low frequency, the scope of application is wider, can meet most of instructions for use.For under the high request of current environment for use and high performance prerequisite, it is important height that high-frequency constant-temperature crystal oscillator just seems excellent.And what shake that device adopts at current most high frequency constant temperature crystal is that the mode of frequency multiplication realizes, realize the performance index relative mistake of high-frequency generator like this, reliability is low.Oscillator performance index thus degradation when mating this oscillating circuit when using the overtone of high overtone time quartz oscillation crystal to reach five times, 7 times, reliability and stability is very unstable, even can not meet the starting condition for oscillation requirement of high frequency oscillation device completely.Cause very large difficulty to design production and use, and theoretic high frequency performance index request is also difficult to reach.
Utility model content
The utility model mainly solves technical problem existing in prior art, thus provides a kind of control sensitive, and component number is few, and production technology is simple, the high-frequency constant temperature crystal oscillator that reliability is high.
Above-mentioned technical problem of the present utility model is mainly solved by following technical proposals: the high-frequency constant temperature crystal oscillator that the utility model provides, comprise crystal oscillating circuit, described crystal oscillating circuit comprises chip, oscillating crystal, variable capacitance diode, first to fourth inductance, first to the 8th electric capacity, first to the 5th resistance, the crus secunda of described chip and one end of the 4th electric capacity, one end of 6th electric capacity is connected, its the 5th pin is connected with power supply through the 5th resistance, its the 6th pin respectively with one end of described 7th electric capacity, one end of 8th electric capacity, one end of 3rd resistance is connected, its the 7th pin is through the 4th grounding through resistance, its octal ground connection, wherein, the other end of described 4th electric capacity is successively through variable capacitance diode, 4th inductance is connected with one end of described oscillating crystal, the other end of described oscillating crystal is respectively with described first, one end of second electric capacity is connected, the other end of described first electric capacity is through the first inductance ground connection, the other end of described second electric capacity is through the second inductance ground connection, and the 3rd Capacitance parallel connection at the two ends of described variable capacitance diode, described first resistance and the 5th electric capacity parallel with one another, and between the anode being connected to described variable capacitance diode and ground, the other end ground connection of described 6th electric capacity, the other end of described 7th electric capacity is connected with the other end of oscillating crystal through the 3rd inductance, the second resistance successively, another termination input of the 8th electric capacity, the other end ground connection of described 3rd resistance.
Further, the equivalent electric circuit of described crystal oscillating circuit comprises the 9th to the 11 electric capacity, variable capacitance, oscillating crystal, amplifier and the 5th inductance, first pin of described amplifier is connected with described one end of 9th electric capacity, one end of oscillating crystal, the other end ground connection of described 9th electric capacity, the other end of described oscillating crystal is connected with one end of described variable capacitance; The crus secunda of described amplifier is connected with one end of the tenth electric capacity, the other end of described tenth electric capacity is connected with the other end of described variable capacitance, one end of the 11 electric capacity, the other end ground connection of described 11 electric capacity, wherein, the harmonic suppression network equivalent that forms with first, second electric capacity described and first, second inductance of described 9th electric capacity or the 11 electric capacity.
Further, the concussion frequency of described crystal oscillating circuit is 125MHz.
The beneficial effects of the utility model are: in main vibration circuit, by the integrated chip of function admirable, higher overtone oscillating crystal and other auxiliary element are connected, form the reliable high-frequency oscillating circuits of high stable, it is sensitive that it has control, component number is few, production technology is simple, high reliability.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment 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 more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the crystal oscillating circuit schematic diagram of high-frequency constant temperature crystal oscillator of the present utility model;
Fig. 2 is the equivalent circuit diagram of the crystal oscillating circuit of high-frequency constant temperature crystal oscillator of the present utility model;
Fig. 3 is the constant voltage equivalent circuit figure of the crystal oscillating circuit of high-frequency constant temperature crystal oscillator of the present utility model;
Fig. 4 is the constant-current source equivalent circuit diagram of the crystal oscillating circuit of high-frequency constant temperature crystal oscillator of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment of the present utility model is described in detail, to make advantage of the present utility model and feature can be easier to be readily appreciated by one skilled in the art, thus more explicit defining is made to protection range of the present utility model.
Consult shown in Fig. 1, high-frequency constant temperature crystal oscillator of the present utility model, comprise crystal oscillating circuit, the concussion frequency of crystal oscillating circuit is 125MHz, crystal oscillating circuit comprises chip IC 1 (integrated chip, can buy), oscillating crystal X1, variable capacitance diode D1, first to fourth inductance L 1-L4, first to the 8th electric capacity C1-C8, first to the 5th resistance R1-R5, the crus secunda of chip IC 1 and one end of the 4th electric capacity C4, one end of 6th electric capacity C6 is connected, its the 5th pin is connected with power supply through the 5th resistance R5, its the 6th pin respectively with one end of the 7th electric capacity C7, one end of 8th electric capacity C8, one end of 3rd resistance R3 is connected, its the 7th pin is through the 4th resistance R4 ground connection, its octal ground connection, wherein, the other end of the 4th electric capacity C4 is successively through variable capacitance diode D1, 4th inductance L 4 is connected with one end of oscillating crystal X1, the other end of oscillating crystal X1 is respectively with first, second electric capacity (C1, C2) one end is connected, the other end of the first electric capacity C1 is through the first inductance L 1 ground connection, the other end of the second electric capacity C2 is through the second inductance L 2 ground connection, and the 3rd electric capacity C3 be connected in parallel on the two ends of variable capacitance diode D1, first resistance R1 and the 5th electric capacity C5 is parallel with one another, and between the anode being connected to variable capacitance diode D1 and ground, the other end ground connection of the 6th electric capacity C6, the other end of the 7th electric capacity C7 is connected with the other end of oscillating crystal X1 through the 3rd inductance L 3, second resistance R2 successively, another termination input of the 8th electric capacity C8, the other end ground connection of the 3rd resistance R3.
In the utility model, oscillating crystal X1 is equivalent to inductance element.When the frequency of oscillator signal is in F
sand F
pbetween time, oscillating crystal X1 just can in sense, circuit just has the condition of carrying out resonance.When oscillating crystal X1 is equivalent to inductance element, this circuit is a typical Colpitts oscillation circuit, as long as meet the starting condition for oscillation of AF > 1, circuit just starting of oscillation also finally can reach balance.And, oscillating crystal X1 itself produce noise and the change of oscillating crystal X1 parameter in antihunt loop, produce a phase deviation, this phase deviation produces a phase error Δ θ at amplifier in, utilize the known phase error of the phase-frequency characteristic of resonant tank and corresponding frequency error contact for:
In formula (1), Δ v is frequency error, and Q is feedback loop quality factor.
Consult shown in Fig. 2-4, the equivalent electric circuit of crystal oscillating circuit comprises the 9th to the 11 electric capacity C9-C11, variable capacitance C12, oscillating crystal X1, amplifier U1 and the 5th inductance L 5, first pin of amplifier U1 is connected with one end of the 9th electric capacity C9, one end of oscillating crystal X1, the other end ground connection of the 9th electric capacity C9, the other end of oscillating crystal X1 is connected with one end of variable capacitance C12; The crus secunda of amplifier U1 is connected with one end of the tenth electric capacity C10, the other end of the tenth electric capacity C10 is connected with one end of the other end of variable capacitance C12, the 11 electric capacity C11, the other end ground connection of the 11 electric capacity C11, wherein, the harmonic suppression network equivalent that forms with first, second electric capacity (C1, C2) and first, second inductance (L1, L2) of the 9th electric capacity C9 or the 11 electric capacity C11.In the utility model, the impedance of the 5th inductance L 5 much larger than resonator impedance, should effectively can prevent the load effect caused because exchanging negative feedback.
Consult shown in figure tri-, in ac equivalent circuit:
A＝|A|e
jφ
φ＝-360°t
PRf
Wherein, g
mfor the mutual conductance of oscillating circuit, φ is the phase angle of mutual conductance, t
pRfor between delay of feedback.And the phase angle due to mutual conductance must cause the skew of frequency, by formula (1) then:
That is: when being used in 125MHz high-frequency, due to the phase angle of mutual conductance, the frequency of oscillator will lower than resonator nominal frequency, using the tenth electric capacity C10, variable capacitance C12 as mutual conductance phase angle compensation and the frequency offset compensation that causes because of mutual conductance phase angle.
To sum up, the utility model causes the frequency of oscillating crystal to offset to some extent due to mutual conductance phase angle, and it can make its frequency stabilization by the compensation of phase angle.Due to the stability had very of amplifier, its frequency drift using the oscillating circuit in this case to cause is very little, and parameter can be done accurately and stablize, so adopt this design frequency of oscillation very accurately and to stablize.
Above, be only embodiment of the present utility model, but protection range of the present utility model is not limited thereto, any change of expecting without creative work or replacement, all should be encompassed within protection range of the present utility model.Therefore, the protection range that protection range of the present utility model should limit with claims is as the criterion.
Claims (3)
1. a high-frequency constant temperature crystal oscillator, comprise crystal oscillating circuit, it is characterized in that: described crystal oscillating circuit comprises chip (IC1), oscillating crystal (X1), variable capacitance diode (D1), first to fourth inductance (L1-L4), first to the 8th electric capacity (C1-C8), first to the 5th resistance (R1-R5), the crus secunda of described chip (IC1) and one end of the 4th electric capacity (C4), one end of 6th electric capacity (C6) is connected, its the 5th pin is connected with power supply through the 5th resistance (R5), its the 6th pin respectively with one end of described 7th electric capacity (C7), one end of 8th electric capacity (C8), one end of 3rd resistance (R3) is connected, its the 7th pin is through the 4th resistance (R4) ground connection, its octal ground connection, wherein, the other end of described 4th electric capacity (C4) is successively through variable capacitance diode (D1), 4th inductance (L4) is connected with one end of described oscillating crystal (X1), the other end of described oscillating crystal (X1) is respectively with described first, second electric capacity (C1, C2) one end is connected, the other end of described first electric capacity (C1) is through the first inductance (L1) ground connection, the other end of described second electric capacity (C2) is through the second inductance (L2) ground connection, and the 3rd electric capacity (C3) be connected in parallel on the two ends of described variable capacitance diode (D1), described first resistance (R1) and the 5th electric capacity (C5) parallel with one another, and between the anode being connected to described variable capacitance diode (D1) and ground, the other end ground connection of described 6th electric capacity (C6), the other end of described 7th electric capacity (C7) is connected with the other end of oscillating crystal (X1) through the 3rd inductance (L3), the second resistance (R2) successively, another termination input of 8th electric capacity (C8), the other end ground connection of described 3rd resistance (R3).
2. high-frequency constant temperature crystal oscillator as claimed in claim 1, it is characterized in that: the equivalent electric circuit of described crystal oscillating circuit comprises the 9th to the 11 electric capacity (C9-C11), variable capacitance (C12), oscillating crystal (X1), amplifier (U1) and the 5th inductance (L5), first pin of described amplifier (U1) and one end of described 9th electric capacity (C9), one end of oscillating crystal (X1) is connected, the other end ground connection of described 9th electric capacity (C9), the other end of described oscillating crystal (X1) is connected with one end of described variable capacitance (C12), the crus secunda of described amplifier (U1) is connected with one end of the tenth electric capacity (C10), the other end of described tenth electric capacity (C10) is connected with the other end of described variable capacitance (C12), one end of the 11 electric capacity (C11), the other end ground connection of described 11 electric capacity (C11), wherein, the harmonic suppression network equivalent that forms with described first, second electric capacity (C1, C2) and first, second inductance (L1, L2) of described 9th electric capacity (C9) or the 11 electric capacity (C11).
3. high-frequency constant temperature crystal oscillator as claimed in claim 1, is characterized in that: the concussion frequency of described crystal oscillating circuit is 125MHz.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520406931.1U CN204721314U (en) | 2015-06-13 | 2015-06-13 | A kind of high-frequency constant temperature crystal oscillator |
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| CN201520406931.1U CN204721314U (en) | 2015-06-13 | 2015-06-13 | A kind of high-frequency constant temperature crystal oscillator |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107666284A (en) * | 2017-11-10 | 2018-02-06 | 广东圣大电子有限公司 | A kind of high frequency crystal oscillator |
| CN111342804A (en) * | 2020-03-06 | 2020-06-26 | 西南交通大学 | Frequency modulation circuit of quartz crystal oscillator |
| CN114925643A (en) * | 2022-06-02 | 2022-08-19 | 贵州振华风光半导体股份有限公司 | Optimization method for high-frequency oscillation circuit algorithm model |
-
2015
- 2015-06-13 CN CN201520406931.1U patent/CN204721314U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107666284A (en) * | 2017-11-10 | 2018-02-06 | 广东圣大电子有限公司 | A kind of high frequency crystal oscillator |
| CN111342804A (en) * | 2020-03-06 | 2020-06-26 | 西南交通大学 | Frequency modulation circuit of quartz crystal oscillator |
| CN111342804B (en) * | 2020-03-06 | 2022-02-25 | 西南交通大学 | Frequency modulation circuit of quartz crystal oscillator |
| CN114925643A (en) * | 2022-06-02 | 2022-08-19 | 贵州振华风光半导体股份有限公司 | Optimization method for high-frequency oscillation circuit algorithm model |
| CN114925643B (en) * | 2022-06-02 | 2023-09-15 | 贵州振华风光半导体股份有限公司 | Optimization method for algorithm model of high-frequency oscillation circuit |
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Granted publication date: 20151021 Termination date: 20190613 |
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