CN102082549A - Voltage control crystal oscillator - Google Patents
Voltage control crystal oscillator Download PDFInfo
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- CN102082549A CN102082549A CN2010105999061A CN201010599906A CN102082549A CN 102082549 A CN102082549 A CN 102082549A CN 2010105999061 A CN2010105999061 A CN 2010105999061A CN 201010599906 A CN201010599906 A CN 201010599906A CN 102082549 A CN102082549 A CN 102082549A
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- crystal oscillator
- filter circuit
- voltage controlled
- electrically connected
- controlled crystal
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Abstract
The invention discloses and provides a voltage control crystal oscillator with a filter circuit; the voltage control crystal oscillator comprises a crystal oscillator, a filter circuit and a control voltage generating circuit; the filter circuit comprises a resistor and a capacitor; the control voltage generating circuit is electrically connected with one end of the resistor, and the other end of the resistor is electrically connected with one end of the capacitor and the crystal oscillator; and the other end of the capacitor is grounded. The voltage control crystal oscillator is capable of improving the phase noise ratio, improving the quality of output signals of the voltage control crystal oscillator, and simultaneously reducing the production cost.
Description
Technical field
The present invention relates to the crystal oscillator field, relate more specifically to a kind of voltage controlled crystal oscillator.
Background technology
Phase noise is meant the random fluctuation of the phase of output signal that causes under the various noise contributions in system, be the important indicator of weighing frequency standard sources VCXO signal stabilization quality.Along with the clock speed in the communication system marches toward the GHz level, phase noise is very crucial in board design, occupies crucial important position in the performance of digit chip and circuit board.In High Speed System, the time of clock or oscillator wave can limit the maximum rate of a digital I/O interface, increases the error rate of communication link, even the dynamic range of restriction A/D converter.Phase noise affects the final signal to noise ratio of frequency modulation, phase modulating system, worsen the performance of some amplitude-modulation detector, influence the maximum noise power of frequency division multiple access receiving system etc., in a lot of advanced electronic system and equipment, require to have the frequency source of a low phase noise.In modern communication systems, because its state presents variation, channel is very intensive again, and conversion in real time constantly if making an uproar mutually of local oscillation signal is relatively poor, can increase the error rate in the communication in certain working hour, influence the carrier frequency tracking accuracy, so also more and more high to the requirement of making an uproar mutually.
The application of quartz oscillator has the history of decades, because of it has high these characteristics of frequency stability, so occupy an important position in electronic technology field always.Especially the high speed development of IT industry more makes this crystal oscillator shine vitality.Quartz oscillator is in telecommunication, satellite communication, mobile telephone system, global positioning system, navigation, remote control, Aero-Space, high-speed computer, accurate measuring instrument and consumer consumer electronic product, as standard frequency source or pulse signal source, frequency reference is provided, and is that the oscillator of other type at present is irreplaceable.Quartz oscillator divides non-temp. compensation type crystal oscillator, temperature compensating crystal oscillator, voltage controlled crystal oscillator, constant-temperature crystal oscillator and digitlization/several types such as the compensation crystal oscillator of μ p.Wherein, voltage controlled crystal oscillator has comparatively stable operating frequency, and higher accuracy, and it is all very good in the performance of aspects such as ageing rate, temperature stability, long-term stability and short-term stability, so the accurate time frequency signal of Chang Zuowei source is widely used in the every field.Voltage controlled crystal oscillator is paid close attention to the phase noise influence in the contemporary electronic systems as the core component of clockwork, more needs to consider how to reduce phase noise.Traditional voltage-controlled crystal is whole to be swung device and comprises voltage controller, crystal oscillation element, single-chip microcomputer and temperature sensor, temperature sensor collecting temperature information is also imported single-chip microcomputer, single-chip microcomputer is handled this temperature information at the voltage-controlled end of back input crystal oscillating element, simultaneously, the output of voltage controller is connected the voltage-controlled end of crystal oscillator.It does not comprise filter circuit, and crystal oscillator output services frequency plot noise is relatively large, and more assorted thorn is arranged on the curve of making an uproar mutually.
Therefore, demand a kind of voltage controlled crystal oscillator that has filter circuit urgently, improve the quality of voltage controlled crystal oscillator output signal, and overcome above-mentioned defective.
Summary of the invention
The object of the present invention is to provide a kind of voltage controlled crystal oscillator that has filter circuit, described voltage controlled crystal oscillator can improve the ratio of making an uproar mutually, and improves the quality of voltage controlled crystal oscillator output signal, has reduced its production cost simultaneously.
In order to achieve the above object, the invention provides a kind of voltage controlled crystal oscillator, described voltage controlled crystal oscillator comprises crystal oscillator, filter circuit and control voltage generation circuit, described filter circuit comprises resistance and electric capacity, described control voltage generation circuit is electrically connected an end of described resistance, the other end of described resistance is electrically connected an end and the described crystal oscillator of described electric capacity, and the other end ground connection of described electric capacity is provided with.
Preferably, described voltage controlled crystal oscillator also comprises temperature-compensation circuit, and described temperature-compensation circuit is electrically connected the described resistance of described filter circuit, and adder is electrically connected between described filter circuit and the described crystal oscillator.
Preferably, described voltage controlled crystal oscillator also comprises temperature sensor, Temperature Treatment device and adder, described temperature sensor is electrically connected the input of described Temperature Treatment device, the output of described Temperature Treatment device is electrically connected the described resistance of described filter circuit, and adder is electrically connected between described filter circuit and the described crystal oscillator.Described temperature sensor detects the ambient temperature of described voltage controlled crystal oscillator, and described temperature signal is transferred to described Temperature Treatment device, and the Temperature Treatment device is input to the temperature feedback signal that disposes in the crystal oscillator.
Preferably, the described Temperature Treatment device in the described voltage controlled crystal oscillator is a single-chip microcomputer, and the digital-to-analog end of convert of single-chip microcomputer is electrically connected with filter circuit.
Preferably, the described resistance value in the described filter circuit in the described voltage controlled crystal oscillator is 10 kilohms-200 kilohms, and the capacitance in the described filter circuit is 0.01 microfarad-0.1 microfarad.
Preferably, in described voltage controlled crystal oscillator, the described resistance value of described filter circuit is 100 kilohms, and the described capacitance in the described filter circuit is 0.1 microfarad.
Preferably, described voltage controlled crystal oscillator also comprises frequency divider, and described frequency divider is electrically connected the output of described crystal oscillator.
Compared with prior art, owing to increased filter circuit, voltage controlled crystal oscillator filtering of the present invention assorted thorn on the curve of making an uproar mutually of its output, make the curve of making an uproar mutually more level and smooth, increase the ratio of making an uproar mutually, improved the quality of voltage controlled crystal oscillator output signal.Even traditional voltage controlled crystal oscillator has filter circuit, its filter circuit is to adopt triode or realize that through frequency-selective network its built-up circuit complexity does not meet the trend requirement of present miniaturization of electronic products.Filter circuit in the voltage controlled crystal oscillator of the present invention is only formed realization by resistance and electric capacity, is reaching outside the same filter effect, has reduced the production cost of voltage controlled crystal oscillator.
By following description also in conjunction with the accompanying drawings, it is more clear that the present invention will become, and these accompanying drawings are used to explain embodiments of the invention.
Description of drawings
Fig. 1 is the components and parts connection diagram of voltage controlled crystal oscillator first embodiment of the present invention.
Fig. 2 is the components and parts connection diagram of voltage controlled crystal oscillator second embodiment of the present invention.
Fig. 3 is the components and parts connection diagram of voltage controlled crystal oscillator the 3rd embodiment of the present invention.
Embodiment
With reference now to accompanying drawing, describe embodiments of the invention, the similar elements label is represented similar elements in the accompanying drawing.The invention provides a kind of voltage controlled crystal oscillator that has filter circuit, described voltage controlled crystal oscillator can improve the ratio of making an uproar mutually, and improves the quality of voltage controlled crystal oscillator output signal, has reduced its production cost simultaneously.
Figure 1 shows that the components and parts connection diagram of voltage controlled crystal oscillator first embodiment of the present invention.With reference to figure 1, voltage controlled crystal oscillator 10 comprises crystal oscillator 11, filter circuit 12 and control voltage generation circuit 13.Described filter circuit 12 comprises resistance 121 and electric capacity 122, the setting of connecting with described electric capacity 122 of described resistance 121.Described control voltage generation circuit 13 is sent by the client electronic product, and the voltage signal that the client electronic product sends is used to control the operating frequency of crystal oscillator output; Particularly, the voltage signal that control voltage generation circuit 13 is sent is directly proportional with the operating frequency of crystal oscillator output, and both are linear haply.The voltage signal output end of control voltage generation circuit 13 is electrically connected an end of described resistance 121, the other end of described resistance 121 is electrically connected an end of described electric capacity 122 and the voltage controling input end of described crystal oscillator 11, and the other end of described electric capacity 122 is electrically connected setting with the grounding pin of client electronic product.In the present embodiment, the resistance value of resistance 121 is 100 kilohms, and the capacitance of electric capacity 122 is 0.1 microfarads.Under this resistance value and capacitance, frequency signal the best of crystal oscillator 11 outputs.In other embodiments, the resistance value of described resistance 121 between desirable 10 kilohms-200 kilohms, described electric capacity 122 can be taken at the capacitance between 0.01 microfarad-0.1 microfarad.In the present embodiment owing to increased filter circuit 12, voltage controlled crystal oscillator 10 filterings the assorted thorn on the curve of making an uproar mutually of its output, make the curve of making an uproar mutually more level and smooth, increased the ratio of making an uproar mutually, improved the quality of voltage controlled crystal oscillator output signal.This filter circuit 12 only adopts resistance 121 and electric capacity 122 to be composed in series, avoid the filter circuit in the conventional voltage control crystal oscillator to adopt triode or frequency-selective network to form the situation of complicated filter circuit, met the trend requirement of modern electronic product miniaturization; Reaching outside the same filter effect, reducing the production cost of voltage controlled crystal oscillator.
Fig. 2 is the components and parts connection diagram of voltage controlled crystal oscillator second embodiment of the present invention.With reference to figure 2, voltage controlled crystal oscillator 20 comprises crystal oscillator 21, filter circuit 22, control voltage generation circuit 23, temperature sensor 24, Temperature Treatment device and adder 26.In the present embodiment, temperature-compensation circuit comprises temperature sensor 24 and Temperature Treatment device, and the Temperature Treatment device is a single-chip microcomputer 25, and in other embodiments, the Temperature Treatment device can be other microprocessor.In conjunction with Fig. 1-2, the circuit of the filter circuit 12 among filter circuit 22 and first embodiment form and connected mode identical, that is: filter circuit 22 is in series by resistance 221 and 222.Similarly, in the present embodiment, the resistance value of resistance 121 is 100 kilohms, and the capacitance of electric capacity 122 is 0.1 microfarads.Under this resistance value and capacitance, frequency signal the best of crystal oscillator 11 outputs.In other embodiments, the resistance value of described resistance 121 between desirable 10 kilohms-200 kilohms, described electric capacity 122 can be taken at the capacitance between 0.01 microfarad-0.1 microfarad.
With reference to figure 2, temperature sensor 24 is electrically connected the input of described single-chip microcomputer 25, the digital-to-analog end of convert of described single-chip microcomputer 25 is electrically connected the resistance 221 in the described filter circuit 22, and adder 26 is connected electrically between described filter circuit 22 and the described crystal oscillator 21.Particularly, described temperature sensor 24 detects the ambient temperature of described voltage controlled crystal oscillator 20, and described temperature signal transferred to described single-chip microcomputer 25, single-chip microcomputer 25 becomes corresponding digital feedback signal with this processes temperature signal, this digital feedback signal is a temperature compensation signal, and the frequency that is used to control crystal oscillator 21 outputs is not subjected to the influence of external temperature environment.Single-chip microcomputer 25 transfers to resistance 221 in the filter circuit 22 with this digital feedback signal; Simultaneously, identical with first embodiment, the voltage signal output end of control voltage generation circuit 23 is electrically connected resistance 221 in the filter circuit 22.The voltage signal of the digital feedback signal of single-chip microcomputer 25 and control voltage generation circuit 23 is input to resistance 221 in the filter circuit 22 together, above-mentioned digital feedback signal and voltage signal are after filtration behind the wave circuit 22, then be input in the adder 26 together, through after the signal mixed processing of adder 26, input to the voltage controling input end of crystal oscillator 21.Crystal oscillator 11 generals wave circuit 22 voltage control signal and digital feedback signals filtered and that pass through after adder 26 is handled after filtration input in the crystal oscillator 21, and crystal oscillator 21 is the output services frequency correspondingly.
Preferably, with reference to figure 3, among the 3rd embodiment of voltage controlled crystal oscillator of the present invention, it also comprises frequency divider 27, and frequency divider 27 is connected the output of crystal oscillator 21, and the output frequency of crystal oscillator 21 is carried out frequency division.
Above invention has been described in conjunction with most preferred embodiment, but the present invention is not limited to the embodiment of above announcement, and should contain various modification, equivalent combinations of carrying out according to essence of the present invention.
Claims (7)
1. voltage controlled crystal oscillator, it is characterized in that, comprise crystal oscillator, filter circuit and control voltage generation circuit, described filter circuit comprises resistance and electric capacity, one end of the described resistance of electrical connection of described control voltage generation circuit, the other end of described resistance is electrically connected an end and the described crystal oscillator of described electric capacity, and the other end ground connection of described electric capacity is provided with.
2. voltage controlled crystal oscillator as claimed in claim 1, it is characterized in that, also comprise temperature-compensation circuit, described temperature-compensation circuit is electrically connected the described resistance of described filter circuit, and adder is electrically connected between described filter circuit and the described crystal oscillator.
3. voltage controlled crystal oscillator as claimed in claim 2, it is characterized in that, also comprise temperature sensor, Temperature Treatment device and adder, described temperature sensor is electrically connected the input of described Temperature Treatment device, the output of described Temperature Treatment device is electrically connected the described resistance of described filter circuit, and adder is electrically connected between described filter circuit and the described crystal oscillator.
4. voltage controlled crystal oscillator as claimed in claim 3 is characterized in that, described Temperature Treatment device is a single-chip microcomputer.
5. voltage controlled crystal oscillator as claimed in claim 1 is characterized in that, the described resistance value in the described filter circuit is 10 kilohms-200 kilohms, and the capacitance in the described filter circuit is 0.01 microfarad-0.1 microfarad.
6. voltage controlled crystal oscillator as claimed in claim 5 is characterized in that, the described resistance value in the described filter circuit is 100 kilohms, and the described capacitance in the described filter circuit is 0.1 microfarad.
7. voltage controlled crystal oscillator as claimed in claim 1 is characterized in that, also comprises frequency divider, and described frequency divider is electrically connected the output of described crystal oscillator.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105999061A CN102082549A (en) | 2010-12-22 | 2010-12-22 | Voltage control crystal oscillator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105999061A CN102082549A (en) | 2010-12-22 | 2010-12-22 | Voltage control crystal oscillator |
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| CN102082549A true CN102082549A (en) | 2011-06-01 |
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| CN2010105999061A Pending CN102082549A (en) | 2010-12-22 | 2010-12-22 | Voltage control crystal oscillator |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103166674A (en) * | 2011-12-14 | 2013-06-19 | 无锡国科微纳传感网科技有限公司 | Signal frequency correction method and signal frequency correction device |
| CN103684257A (en) * | 2012-09-21 | 2014-03-26 | 深圳市振华微电子有限公司 | Voltage-controlled oscillator voltage compensation circuit |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5107227A (en) * | 1988-02-08 | 1992-04-21 | Magellan Corporation (Australia) Pty. Ltd. | Integratable phase-locked loop |
| CN1299185A (en) * | 1999-12-06 | 2001-06-13 | 精工爱普生株式会社 | Temp. compensation type oscillator and its control method, and radio communication device |
| CN1705222A (en) * | 2004-06-03 | 2005-12-07 | 电子科技大学 | Temperature-compensating method for quartz crystal oscillator |
| CN201536361U (en) * | 2009-07-16 | 2010-07-28 | 广东大普通信技术有限公司 | Temperature compensated crystal oscillator |
-
2010
- 2010-12-22 CN CN2010105999061A patent/CN102082549A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5107227A (en) * | 1988-02-08 | 1992-04-21 | Magellan Corporation (Australia) Pty. Ltd. | Integratable phase-locked loop |
| CN1299185A (en) * | 1999-12-06 | 2001-06-13 | 精工爱普生株式会社 | Temp. compensation type oscillator and its control method, and radio communication device |
| CN1705222A (en) * | 2004-06-03 | 2005-12-07 | 电子科技大学 | Temperature-compensating method for quartz crystal oscillator |
| CN201536361U (en) * | 2009-07-16 | 2010-07-28 | 广东大普通信技术有限公司 | Temperature compensated crystal oscillator |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103166674A (en) * | 2011-12-14 | 2013-06-19 | 无锡国科微纳传感网科技有限公司 | Signal frequency correction method and signal frequency correction device |
| CN103684257A (en) * | 2012-09-21 | 2014-03-26 | 深圳市振华微电子有限公司 | Voltage-controlled oscillator voltage compensation circuit |
| CN103684257B (en) * | 2012-09-21 | 2016-09-14 | 深圳市振华微电子有限公司 | A kind of voltage-controlled oscillator voltage compensates circuit |
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Application publication date: 20110601 |