CN102437817A - SMD miniature constant temperature crystal oscillator - Google Patents
SMD miniature constant temperature crystal oscillator Download PDFInfo
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- CN102437817A CN102437817A CN2011103789716A CN201110378971A CN102437817A CN 102437817 A CN102437817 A CN 102437817A CN 2011103789716 A CN2011103789716 A CN 2011103789716A CN 201110378971 A CN201110378971 A CN 201110378971A CN 102437817 A CN102437817 A CN 102437817A
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Abstract
The invention discloses an SMD micro constant temperature crystal oscillator, which comprises a temperature control circuit and an SMD temperature compensation crystal oscillator connected with the temperature control circuit, and is characterized in that: the temperature control circuit comprises a temperature control chip, a thermistor, an MOS (metal oxide semiconductor) tube and a current limiting resistor, wherein the thermistor, the MOS tube and the current limiting resistor are respectively connected with the temperature control chip; and the thermistor and the MOS tube are respectively connected with the SMD temperature compensation crystal oscillator. The crystal oscillator realizes high-precision temperature control of the constant-temperature crystal oscillator in a small volume, better consistency and stability of the crystal oscillator, high integration degree and automatic debugging of a temperature control circuit, higher digitization degree of the crystal oscillator, easy batch production of the constant-temperature crystal oscillator, small volume, low power consumption and low manufacturing cost.
Description
Technical field
The present invention relates to a kind of crystal oscillator, more particularly, relate to a kind of micro constant-temperature crystal oscillator of high steady time reference with high stability.
Background technology
In the crystal oscillator design; In order to obtain higher frequency-temperature characterisitic; We usually adopt the mode that crystal and oscillating circuit thereof are carried out temperature control to improve the frequency stability of crystal oscillator; Be usually said high accuracy temperature control technology, use the crystal oscillator of temperature control technique to be referred to as constant-temperature crystal oscillator.The general mode that adopts the crystal resonator heating of constant-temperature crystal oscillator; Promptly in crystal oscillator, crystal resonator is heated through a heating temperature-adjusting circuit; The temperature of crystal resonator is controlled on the stationary temperature value (to be generally about 85 ℃); Through the crystal oscillator after the temperature control heating, its frequency-temperature stability can be greatly improved.
Along with the continuous development of crystal oscillator technology, the kind of constant-temperature crystal oscillator is also more and more abundanter.Mode according to temperature-adjusting circuit can be divided into digital temperature control and simulation temperature control, and the former produces the heating of temperature control signal controlling power tube based on the single-chip microcomputer digital circuit, and the latter then adopts the heating of analog circuit power controlling pipe.In addition; Form according to temperature control tank; Can constant-temperature crystal oscillator be divided into single groove constant-temperature crystal oscillator and double flute constant-temperature crystal oscillator; The former uses a temperature control tank that crystal resonator is heated temperature control, and the latter uses two temperature control tank and two temperature-adjusting circuits that crystal resonator and crystal oscillator internal circuit are heated temperature control.
Use traditional approach to carry out temperature control, though temperature-controlled precision is higher, the frequency stability of crystal oscillator is higher, and circuit is complicated, and the integrated level of circuit is also lower, and the volume of crystal oscillator and power consumption are all bigger.
Summary of the invention
The object of the present invention is to provide a kind of SMD micro constant-temperature crystal oscillator; Solve complicated circuit, integrated low in the existing crystal oscillator temperature control technique; And defectives such as volume and power consumption are all big reach that volume is little, low in energy consumption, high-frequency-temperature stability, purpose that integrated level is high.
To achieve these goals, the technical scheme of the present invention's employing is following:
A kind of SMD micro constant-temperature crystal oscillator comprises temperature-adjusting circuit, connected SMD temperature compensating crystal oscillator, and wherein said temperature-adjusting circuit comprises the temperature control chip, the thermistor, metal-oxide-semiconductor and the current-limiting resistance that are connected with the temperature control chip respectively; And said thermistor, metal-oxide-semiconductor also are connected with the SMD temperature compensating crystal oscillator respectively.
Further, temperature-adjusting circuit also comprises current-limiting resistance, and this current-limiting resistance is connected with metal-oxide-semiconductor with the temperature control chip respectively.
Above-mentioned temperature control chip comprises the current controller that is connected with said current-limiting resistance, the gate controller that is connected with this current controller, the gain controller that is connected with gate controller, and the temperature monitor that is connected with this gain controller; And gate controller also is connected with said metal-oxide-semiconductor, and temperature monitor also is connected with said thermistor.
Above-mentioned temperature control chip also comprises program storage EEPROM and the I that is connected with this program storage EEPROM
2C interface.
Above-mentioned temperature control chip also comprises the DAC transducer, and the output of said DAC transducer is connected with the voltage-controlled tip of SMD temperature compensating crystal oscillator.
Like this, the temperature control chip has been realized the high integration of temperature-adjusting circuit.
Further, metal-oxide-semiconductor is a P channel MOS power tube.
The operating temperature range of above-mentioned SMD temperature compensating crystal oscillator is-40 ℃～+ 85 ℃.
The temperature-controlled precision of above-mentioned temperature control chip is ± 0.1 ℃, and the temperature control scope is 40 ℃～110 ℃, and operating temperature range is-40 ℃～125 ℃.
Further, the operating temperature range of SMD temperature compensating crystal oscillator is-40 ℃～+ 85 ℃.
Like this, the stability index that makes the SMD temperature compensating crystal oscillator is by original 10
-6Magnitude rises to 10
-8Magnitude.
The temperature-controlled precision of above-mentioned temperature control chip is ± 0.1 ℃, and the temperature control scope is 40 ℃～110 ℃, and operating temperature range is-40 ℃～125 ℃.
Operation principle of the present invention and process are: the temperature control chip heats the SMD temperature compensating crystal oscillator through P channel MOS power tube; And with heating and temperature control in the precise dose scope; Thermistor is as the temperature of the in good time perception SMD of temperature-sensitive components and parts temperature compensating crystal oscillator; Thermistor is connected with temperature-adjusting circuit, and temperature-adjusting circuit is analog voltage signal and the gate voltage of accurately controlling metal-oxide-semiconductor with the conversion of signals of the thermistor that receives, thereby changes the control temperature of metal-oxide-semiconductor; Control temperature is not changed with the variation of the ambient temperature in the external world, finally realize the high-frequency-temperature stability index of crystal oscillator.
Compared with prior art, beneficial effect of the present invention is:
(1), the present invention uses integrated-type high accuracy temperature control chip, through the control metal-oxide-semiconductor crystal oscillator accurately heated, temperature-controlled precision is ± 0.1 ℃, the stability index that makes the SMD temperature compensating crystal oscillator is by original 10
-6Magnitude rises to 10
-8Magnitude has realized the high accuracy temperature control of constant-temperature crystal oscillator in small size, has improved the consistency and the stability of crystal oscillator.
(2), high accuracy temperature control chip of the present invention is integrated current controller, gain controller, temperature monitor, D/A converting circuit (DAC), erasable program storage (EEPROM), support I
2The serial port circuit of C agreement has been realized the high integration of temperature-adjusting circuit.
(3), the temperature control chip of the present invention's use can carry out the parameter setting through serial ports; Content is set to be comprised: temperature controlling point temperature, operating current, system's loop gain, DAC output voltage etc.; Make crystal oscillator have higher digitized degree; Realized the automated debug of constant-temperature crystal oscillator, and the mass production of constant-temperature crystal oscillator.
(4), the present invention the SMD temperature compensating crystal oscillator and the comparison of high target crystal resonator that use, volume is littler, price is lower; And the volume of SMD micro constant-temperature crystal oscillator is 14.6mm * 9.7mm * 6.2mm, and has adopted the form of Surface Mount encapsulation, has not only guaranteed the minimum volume of constant-temperature crystal oscillator, and has greatly reduced power consumption and cost.
Description of drawings
Fig. 1 is the schematic block circuit diagram of the present invention-embodiment.
Fig. 2 is the theory diagram of the present invention-embodiment temperature-adjusting circuit.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described further.Execution mode of the present invention includes but not limited to the following example.
Embodiment
Fig. 1, Fig. 2 illustrate; A kind of SMD micro constant-temperature crystal oscillator of the present invention; Comprise temperature-adjusting circuit, connected SMD temperature compensating crystal oscillator, wherein said temperature-adjusting circuit comprises the temperature control chip, the thermistor, metal-oxide-semiconductor and the current-limiting resistance that are connected with the temperature control chip respectively; And said thermistor, metal-oxide-semiconductor are connected with the SMD temperature compensating crystal oscillator respectively, and said thermistor, metal-oxide-semiconductor carry out NE BY ENERGY TRANSFER with the SMD temperature compensating crystal oscillator through the mode of thermal coupling respectively.
And temperature-adjusting circuit also comprises current-limiting resistance, and this current-limiting resistance is connected with metal-oxide-semiconductor with the temperature control chip respectively.
This routine temperature control chip comprises the current controller that is connected with said current-limiting resistance, the gate controller that is connected with this current controller, the gain controller that is connected with gate controller, and the temperature monitor that is connected with this gain controller; And gate controller is connected with said metal-oxide-semiconductor, and temperature monitor also is connected with said thermistor.
In addition, the temperature control chip also comprises program storage EEPROM and the I that is connected with this program storage EEPROM
2C interface; And the temperature control chip also comprises the DAC transducer, and the output of said DAC transducer is connected with the voltage-controlled tip of SMD temperature compensating crystal oscillator.Erasable program storage is in order to the parameter information of storage chip, and chip parameter comprises temperature controlling point temperature, operating current, system's loop gain, DAC output voltage etc.DAC transducer (digital to analog converter) output dc voltage, voltage is connected to the voltage-controlled tip of SMD temperature compensating crystal oscillator, carries out tuning to the frequency accuracy of temperature compensating crystal oscillator; And the digital to analog converter number of significant digit is 8bit, through I
2C interface can be provided with it, comprises that DAC enables and shutoff, DAC output voltage values, and the scope of DAC output voltage is 0V～2V.
This routine thermistor is that resistance is negative temperature coefficient (NTC) thermistor of 100k Ω, and the MOS power tube is the MOS power tube of the P raceway groove of Surface Mount encapsulation.
The temperature-controlled precision of the temperature control chip that this is routine is ± 0.1 ℃, and the temperature control scope is 40 ℃～110 ℃, and operating temperature range is-40 ℃～125 ℃, and initial temperature control accuracy is ± 3 ℃, and operating voltage is 3V～15V, and encapsulation volume is 2.1mm * 1.6mm * 0.55mm.
The volume of the SMD temperature compensating crystal oscillator that this is routine is 3.2mm * 2.5mm * 0.9mm, and packing forms is the surface mount form, and its frequency-temperature stability index is superior to ± 0.5ppm (0 ℃～85 ℃), and operating temperature range is-40 ℃～+ 85 ℃.
SMD micro constant-temperature crystal oscillator of the present invention; Its frequency-temperature stability index is superior to ± 50ppb (40 ℃～70 ℃); Operating voltage is 3.14V～3.46V; Maximum power dissipation is 500mW (40 ℃～70 ℃), and the normal temperature steady state power consumption is less than 250mW (be in ambient temperature 25 ℃ ± 3 ℃ condition under).
The volume of SMD micro constant-temperature crystal oscillator of the present invention is 14.6mm * 9.7mm * 6.2mm; Adopt surface-pasted encapsulating structure; 6 exits of crystal oscillator; Comprise 4 function pin and 2 debugging pin, 4 function pins be respectively supply voltage, frequency output, voltage-controlled,, 2 debugging pins are used for I
2The data terminal of C interface communication and clock end.
According to the foregoing description, just can realize the present invention well.
Claims (8)
1. a SMD micro constant-temperature crystal oscillator comprises temperature-adjusting circuit, connected SMD temperature compensating crystal oscillator, and it is characterized in that: said temperature-adjusting circuit comprises the temperature control chip, the thermistor, the metal-oxide-semiconductor that are connected with the temperature control chip respectively; And thermistor, metal-oxide-semiconductor also are connected with the SMD temperature compensating crystal oscillator respectively.
2. a kind of SMD micro constant-temperature crystal oscillator according to claim 1, it is characterized in that: said temperature-adjusting circuit also comprises current-limiting resistance, and this current-limiting resistance is connected with metal-oxide-semiconductor with the temperature control chip respectively.
3. a kind of SMD micro constant-temperature crystal oscillator according to claim 2; It is characterized in that: said temperature control chip comprises the current controller that is connected with said current-limiting resistance, the gate controller that is connected with this current controller, the gain controller that is connected with gate controller, and the temperature monitor that is connected with this gain controller; And gate controller also is connected with said metal-oxide-semiconductor, and temperature monitor also is connected with said thermistor.
4. according to claim 1 or 3 described a kind of SMD micro constant-temperature crystal oscillators, it is characterized in that: said temperature control chip also comprises program storage EEPROM and the I that is connected with this program storage EEPROM
2C interface.
5. a kind of SMD micro constant-temperature crystal oscillator according to claim 4, it is characterized in that: said temperature control chip also comprises the DAC transducer, and the output of said DAC transducer is connected with the voltage-controlled tip of SMD temperature compensating crystal oscillator.
6. a kind of SMD micro constant-temperature crystal oscillator according to claim 1 is characterized in that: said metal-oxide-semiconductor is a P channel MOS power tube.
7. a kind of SMD micro constant-temperature crystal oscillator according to claim 1, it is characterized in that: the operating temperature range of said SMD temperature compensating crystal oscillator is-40 ℃～+ 85 ℃.
8. a kind of SMD micro constant-temperature crystal oscillator according to claim 1, it is characterized in that: the temperature-controlled precision of said temperature control chip is ± 0.1 ℃, and the temperature control scope is 40 ℃～110 ℃, and operating temperature range is-40 ℃～125 ℃.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103789716A CN102437817A (en) | 2011-11-25 | 2011-11-25 | SMD miniature constant temperature crystal oscillator |
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|---|---|---|---|
| CN2011103789716A CN102437817A (en) | 2011-11-25 | 2011-11-25 | SMD miniature constant temperature crystal oscillator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106559070A (en) * | 2016-10-18 | 2017-04-05 | 北京无线电计量测试研究所 | A kind of constant-temperature crystal oscillator |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2664287Y (en) * | 2003-10-22 | 2004-12-15 | 华中科技大学 | A thermostatic crystal oscillator |
| US20060192626A1 (en) * | 2005-02-28 | 2006-08-31 | Bryan Milliren | High stability double oven crystal oscillator |
| CN101604970A (en) * | 2009-07-02 | 2009-12-16 | 广州市天马电讯科技有限公司 | Self-fitting digital temperature compensation crystal oscillistor and system thereof and implementation method |
| CN201674463U (en) * | 2010-06-13 | 2010-12-15 | 唐山晶源裕丰电子股份有限公司 | Low power consumption vacuum packaging precise constant-temperature compensated crystal oscillator |
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2011
- 2011-11-25 CN CN2011103789716A patent/CN102437817A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2664287Y (en) * | 2003-10-22 | 2004-12-15 | 华中科技大学 | A thermostatic crystal oscillator |
| US20060192626A1 (en) * | 2005-02-28 | 2006-08-31 | Bryan Milliren | High stability double oven crystal oscillator |
| CN101604970A (en) * | 2009-07-02 | 2009-12-16 | 广州市天马电讯科技有限公司 | Self-fitting digital temperature compensation crystal oscillistor and system thereof and implementation method |
| CN201674463U (en) * | 2010-06-13 | 2010-12-15 | 唐山晶源裕丰电子股份有限公司 | Low power consumption vacuum packaging precise constant-temperature compensated crystal oscillator |
Non-Patent Citations (1)
| Title |
|---|
| 高加林等: "一种高效率TEC温度控制器的设计", 《集成电路通讯》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106559070A (en) * | 2016-10-18 | 2017-04-05 | 北京无线电计量测试研究所 | A kind of constant-temperature crystal oscillator |
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Application publication date: 20120502 |