CN104467673A - Stable voltage-controlled crystal oscillator circuit - Google Patents
Stable voltage-controlled crystal oscillator circuit Download PDFInfo
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- CN104467673A CN104467673A CN201410677937.2A CN201410677937A CN104467673A CN 104467673 A CN104467673 A CN 104467673A CN 201410677937 A CN201410677937 A CN 201410677937A CN 104467673 A CN104467673 A CN 104467673A
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Abstract
The invention relates to the field of development of circuit boards and discloses a stable voltage-controlled crystal oscillator circuit. According to the stable voltage-controlled crystal oscillator circuit, the two ends of an adjustable resistor RX1 are connected with the first end and the second end of a voltage stabilization unit respectively, and the voltage stabilization unit provides a stable voltage and provides a stable controllable voltage for a voltage-controlled crystal oscillator chip through the adjustable resistor RX1; consequently, the frequency of a clock signal is not prone to fluctuation in the adjusting process, and the stable voltage-controlled crystal oscillator circuit is convenient to use and practical.
Description
Technical field
The present invention relates to circuit board development field, particularly, relate to a kind of stable VCXO circuit.
Background technology
Circuit board has another name called printed substrate, is a kind of by the circuit board of multiple chip or combination of devices realize target function together.Available circuit plate mostly is digital circuit board, therefore needs crystal oscillating circuit to provide clock signal, to make the digit chip deal with data at a high speed on circuit board.In side circuit plate development process, sometimes need the clock signal frequency regulating crystal oscillating circuit.For this situation, the mode of usual employing VCXO, namely by the crystal oscillator frequency (be generally that additional controllable voltage is added on the variable capacitance diode of VCXO chip internal, reached the effect changing frequency by the capacitance changing variable capacitance diode) of additional controllable voltage adjustment VCXO chip.
In the crystal oscillating circuit that above-mentioned clock signal frequency is adjustable, general structure is the adjustable side of the external adjustable resistance of voltage controling end of VCXO chip, the first end of adjustable resistance connects direct voltage source (such as 5V supply power voltage), second end ground connection of adjustable resistance, by the adjustable side of mobile adjustable resistance, change the dividing potential drop situation of variable voltage, thus additional controllable voltage is provided.In side circuit plate, due to the problem of circuit crosstalk, the voltage possibility that direct voltage source provides is also unstable, and make the frequency of clock signal in adjustment process easily occur fluctuation, not easily quick adjustment is to target frequency.
For regulating unstable problem in above-mentioned current crystal oscillating circuit, needing to provide a kind of stable VCXO circuit, can provide stable controllable voltage, not easily there is fluctuation in the frequency of clock signal in adjustment process, convenient and practical.
Summary of the invention
For regulating unstable problem in above-mentioned current crystal oscillating circuit, the invention provides a kind of stable VCXO circuit, can provide stable controllable voltage, not easily there is fluctuation in the frequency of clock signal in adjustment process, convenient and practical.
The technical solution used in the present invention, provides a kind of stable VCXO circuit, it is characterized in that, comprising: voltage regulation unit, VCXO chip, by-pass unit, adjustable resistance RX1, resistance R1, resistance R2 and resistance R3; The first end of voltage regulation unit connects the first end of adjustable resistance RX1 and the first end of resistance R1, second end of voltage regulation unit connects second end of adjustable resistance RX1, second end of resistance R1 connects the sliding end of adjustable resistance RX1 and the first end of resistance R2, the second end ground connection of resistance R2, the sliding end of adjustable resistance RX1 connects the voltage controling end of VCXO chip; The first end of by-pass unit connects the first direct voltage source VCC1, second end of by-pass unit connects the power input of VCXO chip, the earth terminal ground connection of VCXO chip, the first end of the output contact resistance R3 of VCXO chip, the second end clock signal of resistance R3.
Concrete, described voltage regulation unit comprises: low difference voltage regulator, electric capacity C1, electric capacity C2, electric capacity C3, polar capacitor PC1, polar capacitor PC2 and polar capacitor PC3, the input of low difference voltage regulator connects the second direct voltage source VCC2, low difference voltage regulator connects the first end of electric capacity C1 simultaneously, the second end ground connection of electric capacity C1, the anode of polar capacitor PC1 connects the first end of electric capacity C1, the minus earth of polar capacitor PC1, the anode of polar capacitor PC2 connects the first end of electric capacity C1, the minus earth of polar capacitor PC2, the earth terminal ground connection of low difference voltage regulator, the output of low difference voltage regulator connects the first end of voltage regulation unit, shunt capacitance C2 and electric capacity C3 between the first end of voltage regulation unit and the second end, the anode of polar capacitor PC3 connects the first end of voltage regulation unit, the negative electrode of polar capacitor PC3 connects the second end of voltage regulation unit.
Concrete, described by-pass unit comprises: electric capacity C4, electric capacity C5, electric capacity C6 and inductance L 1;
The first end of by-pass unit connects the first end of electric capacity C4 and the first end of inductance L 1, the second end ground connection of electric capacity C4, second end of inductance L 1 connects the second end of by-pass unit and the first end of electric capacity C5, the second end ground connection of electric capacity C5, the two ends shunt capacitance C6 of electric capacity C5.
To sum up, the stable VCXO circuit provided of the present invention is provided, the two ends of adjustable resistance RX1 connect first end and second end of voltage regulation unit respectively, voltage regulation unit provides burning voltage, and by adjustable resistance RX1 for VCXO chip provides stable controllable voltage, thus fluctuation not easily appears in the frequency of clock signal in adjustment process, convenient and practical.
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 some embodiments of the present 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 these accompanying drawings.
Fig. 1 is the stable VCXO circuit diagram that the embodiment of the present invention provides.
Embodiment
Hereinafter with reference to accompanying drawing, describe a kind of stable VCXO circuit provided by the invention in detail by way of example.It should be noted that at this, the explanation for these way of example understands the present invention for helping, but does not form limitation of the invention.
Various technology described herein may be used for but is not limited to circuit board development field, can also be used for other similar field.
Term "and/or" herein, it is only a kind of incidence relation describing affiliated partner, three kinds of relations can be there are in expression, such as, A and/or B, can represent: individualism A, individualism B, there are A and B tri-kinds of situations simultaneously, herein term " or/and " be describe another kind of affiliated partner relation, can there are two kinds of relations in expression, such as, A is or/and B, can represent: individualism A, individualism A and B two kinds of situations, in addition, character "/" herein, general expression forward-backward correlation is to liking a kind of "or" relation.
Embodiment one, Fig. 1 shows the stable VCXO circuit diagram that the present embodiment provides.Described stable VCXO circuit, is characterized in that, comprising: voltage regulation unit, VCXO chip, by-pass unit, adjustable resistance RX1, resistance R1, resistance R2 and resistance R3; The first end of voltage regulation unit connects the first end of adjustable resistance RX1 and the first end of resistance R1, second end of voltage regulation unit connects second end of adjustable resistance RX1, second end of resistance R1 connects the sliding end of adjustable resistance RX1 and the first end of resistance R2, the second end ground connection of resistance R2, the sliding end of adjustable resistance RX1 connects the voltage controling end of VCXO chip; The first end of by-pass unit connects the first direct voltage source VCC1, second end of by-pass unit connects the power input of VCXO chip, the earth terminal ground connection of VCXO chip, the first end of the output contact resistance R3 of VCXO chip, the second end clock signal of resistance R3.In described crystal oscillating circuit structure, the two ends of adjustable resistance RX1 connect first end and second end of voltage regulation unit respectively, voltage regulation unit provides burning voltage, and by adjustable resistance RX1 for VCXO chip provides stable controllable voltage, thus fluctuation not easily appears in the frequency of clock signal in adjustment process, convenient and practical.As what optimize, in the present embodiment, described VCXO chip is OC14-VAAEGA-50MHz, and power input is VCC end, and voltage controling end is VC end, and earth terminal is GND end, and output is OSC end; The supply power voltage of the first direct voltage source VCC1 is 3.3V.The maximum value of adjustable resistance RX1 is 10K ohm, and the resistance of resistance R1 is 4.7K ohm, and the resistance of resistance R2 is 4.7K ohm, and the resistance of resistance R3 is 10K ohm.
Concrete, described voltage regulation unit comprises: low difference voltage regulator, electric capacity C1, electric capacity C2, electric capacity C3, polar capacitor PC1, polar capacitor PC2 and polar capacitor PC3, the input of low difference voltage regulator connects the second direct voltage source VCC2, low difference voltage regulator connects the first end of electric capacity C1 simultaneously, the second end ground connection of electric capacity C1, the anode of polar capacitor PC1 connects the first end of electric capacity C1, the minus earth of polar capacitor PC1, the anode of polar capacitor PC2 connects the first end of electric capacity C1, the minus earth of polar capacitor PC2, the earth terminal ground connection of low difference voltage regulator, the output of low difference voltage regulator connects the first end of voltage regulation unit, shunt capacitance C2 and electric capacity C3 between the first end of voltage regulation unit and the second end, the anode of polar capacitor PC3 connects the first end of voltage regulation unit, the negative electrode of polar capacitor PC3 connects the second end of voltage regulation unit.It is stable output voltage that described low difference voltage regulator is used for the voltage transitions of different range, be connected to the electric capacity C1 of low difference voltage regulator first end, polar capacitor PC1 and polar capacitor PC2 as shunt capacitance, for the spuious high-frequency signal of filtering low difference voltage regulator input, and being connected to the electric capacity C1 of low voltage voltage prescription dosage regulating device second end, electric capacity C3 and polar capacitor are used for the spuious high-frequency signal that filtering is produced by adjustable resistance RX1 in adjustment process.By voltage regulation unit, the voltage at adjustable resistance RX1 two ends is made to be in stable state all the time.As what optimize, in the present embodiment, described low difference voltage regulator is LM1111_3.3, and input is INPUT end, and output is OUTPUT end, and earth terminal is GND end; The supply power voltage of the second direct voltage source VCC2 is 5V.The capacitance of electric capacity C1 is 0.1 microfarad, and the capacitance of electric capacity C2 is 0.1 microfarad, and the capacitance of electric capacity C3 is 22 microfarads, and the capacitance of polar capacitor PC1 is 10 microfarads, and the capacitance of polar capacitor PC2 is 10 microfarads, and the capacitance of polar capacitor PC3 is 10 microfarads.
Concrete, described by-pass unit comprises: electric capacity C4, electric capacity C5, electric capacity C6 and inductance L 1; The first end of by-pass unit connects the first end of electric capacity C4 and the first end of inductance L 1, the second end ground connection of electric capacity C4, second end of inductance L 1 connects the second end of by-pass unit and the first end of electric capacity C5, the second end ground connection of electric capacity C5, the two ends shunt capacitance C6 of electric capacity C5.Described by-pass unit is used for the spuious high-frequency signal in filtering first direct voltage source VCC1.As what optimize, in the present embodiment, the capacitance of described electric capacity C4 is 1 microfarad, and the capacitance of electric capacity C5 is 10 microfarads, and the capacitance of electric capacity C6 is 0.1 microfarad, and the inductance value of inductance L 1 is 330 microhenrys.
The stable VCXO circuit that the present embodiment provides, the two ends of adjustable resistance RX1 connect first end and second end of voltage regulation unit respectively, voltage regulation unit provides burning voltage, and by adjustable resistance RX1 for VCXO chip provides stable controllable voltage, thus fluctuation not easily appears in the frequency of clock signal in adjustment process, convenient and practical.
As mentioned above, the present invention can be realized preferably.For a person skilled in the art, according to instruction of the present invention, designing multi-form stable VCXO circuit does not need performing creative labour.Without departing from the principles and spirit of the present invention these embodiments changed, revise, replace, integrate and modification still falls within the scope of protection of the present invention.
Claims (5)
1. a stable VCXO circuit, is characterized in that, comprising: voltage regulation unit, VCXO chip, by-pass unit, adjustable resistance RX1, resistance R1, resistance R2 and resistance R3;
The first end of voltage regulation unit connects the first end of adjustable resistance RX1 and the first end of resistance R1, second end of voltage regulation unit connects second end of adjustable resistance RX1, second end of resistance R1 connects the sliding end of adjustable resistance RX1 and the first end of resistance R2, the second end ground connection of resistance R2, the sliding end of adjustable resistance RX1 connects the voltage controling end of VCXO chip;
The first end of by-pass unit connects the first direct voltage source VCC1, second end of by-pass unit connects the power input of VCXO chip, the earth terminal ground connection of VCXO chip, the first end of the output contact resistance R3 of VCXO chip, the second end clock signal of resistance R3.
2. a kind of stable VCXO circuit as claimed in claim 1, it is characterized in that, described voltage regulation unit comprises: low difference voltage regulator, electric capacity C1, electric capacity C2, electric capacity C3, polar capacitor PC1, polar capacitor PC2 and polar capacitor PC3;
The input of low difference voltage regulator connects the second direct voltage source VCC2, low difference voltage regulator connects the first end of electric capacity C1 simultaneously, the second end ground connection of electric capacity C1, the anode of polar capacitor PC1 connects the first end of electric capacity C1, the minus earth of polar capacitor PC1, the anode of polar capacitor PC2 connects the first end of electric capacity C1, the minus earth of polar capacitor PC2, the earth terminal ground connection of low difference voltage regulator, the output of low difference voltage regulator connects the first end of voltage regulation unit, shunt capacitance C2 and electric capacity C3 between the first end of voltage regulation unit and the second end, the anode of polar capacitor PC3 connects the first end of voltage regulation unit, the negative electrode of polar capacitor PC3 connects the second end of voltage regulation unit.
3. a kind of stable VCXO circuit as claimed in claim 1, it is characterized in that, described by-pass unit comprises: electric capacity C4, electric capacity C5, electric capacity C6 and inductance L 1;
The first end of by-pass unit connects the first end of electric capacity C4 and the first end of inductance L 1, the second end ground connection of electric capacity C4, second end of inductance L 1 connects the second end of by-pass unit and the first end of electric capacity C5, the second end ground connection of electric capacity C5, the two ends shunt capacitance C6 of electric capacity C5.
4. a kind of stable VCXO circuit as claimed in claim 1, is characterized in that:
Described VCXO chip is OC14-VAAEGA-50MHz, and power input is VCC end, and voltage controling end is VC end, and earth terminal is GND end, and output is OSC end;
The supply power voltage of the first direct voltage source VCC1 is 3.3V.
5. a kind of stable VCXO circuit as claimed in claim 2, is characterized in that:
Described low difference voltage regulator is LM1111_3.3, and input is INPUT end, and output is OUTPUT end, and earth terminal is GND end;
The supply power voltage of the second direct voltage source VCC2 is 5V.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410677937.2A CN104467673A (en) | 2014-11-24 | 2014-11-24 | Stable voltage-controlled crystal oscillator circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410677937.2A CN104467673A (en) | 2014-11-24 | 2014-11-24 | Stable voltage-controlled crystal oscillator circuit |
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| CN104467673A true CN104467673A (en) | 2015-03-25 |
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| CN201410677937.2A Pending CN104467673A (en) | 2014-11-24 | 2014-11-24 | Stable voltage-controlled crystal oscillator circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114047796A (en) * | 2022-01-12 | 2022-02-15 | 北京晨晶精仪电子有限公司 | Temperature control circuit, constant temperature crystal oscillator circuit and constant temperature crystal oscillator |
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| US5708394A (en) * | 1996-07-01 | 1998-01-13 | Hewlett-Packard Company | Bridge-stabilized oscillator circuit and method |
| CN202841054U (en) * | 2012-10-29 | 2013-03-27 | 江苏瑞特电子设备有限公司 | High-stability crystal oscillator |
| CN103187924A (en) * | 2011-12-30 | 2013-07-03 | 无锡华润矽科微电子有限公司 | Oscillator circuit structure |
| CN103308191A (en) * | 2013-05-22 | 2013-09-18 | 杭州电子科技大学 | Low-power consumption wireless temperature acquisition circuit |
| CN103944512A (en) * | 2014-04-17 | 2014-07-23 | 重庆西南集成电路设计有限责任公司 | Oscillator circuit with high frequency stability and negative temperature coefficient current source circuit |
-
2014
- 2014-11-24 CN CN201410677937.2A patent/CN104467673A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5708394A (en) * | 1996-07-01 | 1998-01-13 | Hewlett-Packard Company | Bridge-stabilized oscillator circuit and method |
| CN103187924A (en) * | 2011-12-30 | 2013-07-03 | 无锡华润矽科微电子有限公司 | Oscillator circuit structure |
| CN202841054U (en) * | 2012-10-29 | 2013-03-27 | 江苏瑞特电子设备有限公司 | High-stability crystal oscillator |
| CN103308191A (en) * | 2013-05-22 | 2013-09-18 | 杭州电子科技大学 | Low-power consumption wireless temperature acquisition circuit |
| CN103944512A (en) * | 2014-04-17 | 2014-07-23 | 重庆西南集成电路设计有限责任公司 | Oscillator circuit with high frequency stability and negative temperature coefficient current source circuit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114047796A (en) * | 2022-01-12 | 2022-02-15 | 北京晨晶精仪电子有限公司 | Temperature control circuit, constant temperature crystal oscillator circuit and constant temperature crystal oscillator |
| CN114047796B (en) * | 2022-01-12 | 2022-04-05 | 北京晨晶精仪电子有限公司 | Temperature control circuit, constant temperature crystal oscillator circuit and constant temperature crystal oscillator |
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Application publication date: 20150325 |
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