CN103607198A - 100MHz high-frequency constant temperature crystal oscillator for spaceflight - Google Patents
100MHz high-frequency constant temperature crystal oscillator for spaceflight Download PDFInfo
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- CN103607198A CN103607198A CN201310614087.7A CN201310614087A CN103607198A CN 103607198 A CN103607198 A CN 103607198A CN 201310614087 A CN201310614087 A CN 201310614087A CN 103607198 A CN103607198 A CN 103607198A
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Abstract
The invention relates to the field of crystal oscillators, in particular to a 100MHz high-frequency constant temperature crystal oscillator for spaceflight. The 100MHz high-frequency constant temperature crystal oscillator comprises a power source module, a main oscillation module, a temperature control module and an amplifying output module. After the voltage of the power source module is stabilized through a voltage stabilizer, the power source module is used for supplying electricity to the main oscillation module, the temperature control module and the amplifying output module. The temperature control module is used for controlling the environment temperature of the main oscillation module. The output end of the main oscillation module is connected with the input end of the amplifying output module. A constant temperature groove is heated through a customized copper sheet in a heat transmission mode, the size of the constant temperature groove can be reduced, the utilization rate of heat of a high-power heating pipe can be higher, the power consumption of the crystal oscillator is reduced, the crystal can be heated more evenly, and the frequency-temperature stability index is improved.
Description
Technical field
The present invention relates to crystal oscillator field, particularly relate to 100MHz high-frequency constant-temperature crystal oscillator for a kind of space flight.
Background technology
Inner crystal, transistor and the variable capacitance diodes etc. that use of crystal oscillator all belong to responsive to temperature components and parts.In crystal oscillator, the control temperature of constant temperature system and the inflection temperature of crystal are matched, and (crystal is worked near inflection temperature, its frequency-temperature coefficient is minimum), crystal is operated in a constant inflection temperature environment, crystal oscillator work is the most stable.The feature of constant-temperature crystal oscillator is when ambient temperature changes, the inner temperature-adjusting circuit of constant-temperature crystal oscillator carries out work, make the variations in temperature of the inner thermostat of crystal oscillator minimum, thereby guarantee that the electrical performance indexes of crystal oscillator is subject to externally temperature influence minimum.
Space flight is forbidden process stipulation with constant-temperature crystal oscillator, lead-in wire components and parts can not be installed by pasting board, lead-in wire root need be at 0.75mm_-3.5mm to solder side, and the inner crystal resonator using of constant-temperature crystal oscillator, transistor and variable capacitance diode etc. all belong to responsive to temperature components and parts, wherein crystal resonator and transistor are all again lead-in wire components and parts, if these two kinds of key componentses not pasting board are installed, the heat of high-power heating pipe can not be quick, pass to uniformly them, the power consumption of crystal oscillator not only increases, temperature field is inhomogeneous, and can only reach ± 0.5ppm of crystal oscillator frequency temperature stability index, therefore, early stage space flight is all placed in thermostat with constant-temperature crystal oscillator equitemperature sensitive components, again by thermostat outside around electric-heating-wire-heating, this design constant-temperature crystal oscillator volume is bigger than normal, do not reach space flight and by crystal oscillator overall dimension, be less than the requirement of (50 * 50 * 70) mm, now space flight with constant-temperature crystal oscillator to small product size, weight has strict demand, traditional structure is used non-plastic packaging components and parts volume to be difficult to greatly satisfy the demands the volume requirement of constant-temperature crystal oscillator for space flight.And constant-temperature crystal oscillator requires the indexs such as frequency stability of temperature, existing constant-temperature crystal oscillator can not meet the requirement that volume is little, can not meet again the requirement of frequency stability of temperature.
Summary of the invention
The object of the invention is in order to overcome above-mentioned defect, the 100MHz high-frequency constant-temperature crystal oscillator for space flight that a kind of frequency stabilization temperature stability is good, volume is little is provided.
For achieving the above object, 100MHz high-frequency constant-temperature crystal oscillator for a kind of space flight of the present invention's design, comprise power module and the main module of shaking, its special feature is: also comprise temperature control modules and amplify output module, the output of described power module is connected with pressurizer, the output of pressurizer connects respectively main shake module, temperature control modules and amplification output module, and power module is undertaken to main shake module, temperature control modules and amplification output module, powering after voltage stabilizing by pressurizer; The output of described temperature control modules is connected with the input of the main module of shaking, and described temperature control modules is controlled the ambient temperature of the main module of shaking, and the shake output of module of described master is connected with the input of amplification output module;
Described crystal oscillator oscillation module is comprised of master-oscillator circuit and tuning network, and the output of described master-oscillator circuit connects the input of described tuning network;
Described temperature control modules is comprised of heater circuit and temperature control circuit, the output of described temperature control circuit is connected with the input of described heater circuit, for controlling the temperature spot of heater circuit output, be connected with described master-oscillator circuit, tuning network respectively, for to the heating of described master-oscillator circuit, tuning network, for giving master-oscillator circuit, tuning network heats and remain under stationary temperature and work;
Described amplification output module comprises cascode transistor, LC tuning network, isolation filter network, and the collector electrode of described cascode transistor is connected with LC tuning network, and the output of described cascode transistor connects isolation filter network.
In technique scheme, the heater circuit heating surface of described temperature control modules is welded on copper plate; The cascode transistor pin of the module of described amplification output module is through copper plate, interval 0.2mm between cascode transistor bottom enclosure and copper plate; The shell of crystal oscillator oscillation module is close to copper plate and is installed.
In technique scheme, described heater circuit comprises high-power heating pipe and thermistor, the pin of high-power heating pipe, crystal oscillator oscillation module and cascode transistor is all welded on pcb board and is electrically connected to, the surrounding of described cascode transistor is coated with silica gel, the silica gel scope of described coating shell bottom sides long 3/4 within, thermistor is arranged between crystal resonator and heating power pipe.
In technique scheme, the pressurizer that described power module outlet connects is three terminal regulator.
The constant-temperature crystal oscillator operating frequency of the present invention's design is that 100MHz, supply voltage are 12V, be better than ± 0.05ppm of frequency stability of temperature, be better than-155dBc/Hz of phase noise@1kHz, volume is (40 * 40 * 16) mm, thermostat adopts the copper plate heat transfer pattern heating of customization, more than comparing traditional thermostat volume-diminished twice.
Thermostat by this invention after this constant-temperature crystal oscillator frequency stability of temperature index obtain fine improvement, adopt 100MHz constant-temperature crystal oscillator frequency-temperature stability test data of different installation to see the following form 1:
Table 1 100MHz constant-temperature crystal oscillator frequency-temperature stability test data
On the basis through many-sided theory analysis and practical experience for many years, in the circuit that the present invention sets, component parameter is made as finished product crystal oscillator after by suitable adjustment, and this crystal oscillator can meet small size, high-frequency-temperature stability, low making an uproar mutually and the requirement such as high reliability on the whole.
The present invention in design process, has taken into full account the processing of product, the reliability of use, requirement that volume is little, and stability, low making an uproar mutually require the relation of restriction mutually, through COMPREHENSIVE CALCULATING checking, has guaranteed that electrical parameter level is stable, has stronger practicality.
The present invention has the following advantages:
1, thermostat adopts the heating of customization copper plate heat transfer pattern, can not only reduce the volume of thermostat, also can make the heat utilization ratio of high-power heating pipe higher, reduces the power consumption of crystal oscillator; The heating of crystal is simultaneously more even, has improved frequency-temperature stability index.
2, circuit design of the present invention, has not only reduced the usage quantity of components and parts, has reduced on the whole the volume of crystal oscillator, has also reduced the noise that components and parts are introduced.
3, adopt the low transistor of making an uproar mutually to do oscillator stage oscillating tube, and add reasonable debugging, improved the index of making an uproar mutually of crystal oscillator.
Accompanying drawing explanation
Fig. 1 is the overall structure schematic diagram of 100MHz high-frequency temperature stability constant-temperature crystal oscillator for a kind of space flight;
Fig. 2 is the circuit theory diagrams that in Fig. 1,100MHz high-frequency temperature stability constant-temperature crystal oscillator is used in space flight;
In figure: 1-power module; 2-master's module of shaking; 3-temperature control modules; 4-amplifies output module; 5-copper plate; 6-PCB plate; 7-thermistor; 8-crystal resonator; 9-heating power pipe.
Embodiment
Below in conjunction with accompanying drawing and instantiation, the present invention is described in further detail:
100MHz high-frequency temperature stability constant-temperature crystal oscillator for space flight as shown in Figure 1 and Figure 2, comprises power module 1, the main module 2 of shaking, temperature control modules 3 and amplifies output module 4.
The output of power module 1 is connected with pressurizer, the output of pressurizer connects respectively the main module 2 of shaking, temperature control modules 3 and amplifies output module 4, and power module 1 is undertaken to the main module 2 of shaking, temperature control modules 3 and amplification output module 4, powering after voltage stabilizing by three terminal regulator; Make the stable operating voltage of main shake module 2 and temperature control modules 3, reduce the impact of mains voltage variations on oscillating circuit, the shake ambient temperature of module 2 of 3 couples of masters of temperature control modules is controlled, and the output of the main module 2 of shaking is connected with the input of amplification output module 4; Crystal oscillator oscillation module 2 is comprised of master-oscillator circuit and tuning network, and the output of master-oscillator circuit connects the input of tuning network; Master-oscillator circuit adopt Ke Er hereby overtone circuit as first order master-oscillator circuit, crystal is arranged in feedback network, an inductance element as oscillation circuit, participate in vibration together with other elements in loop, form capacitance three-point type circuit, adopt one-level vibration one-level to amplify output, reduce component number, reduced volume.Crystal selects SC to cut 100MHz5 overtone HC-35/U cold welding encapsulation crystal, due to the frequency spectrum more complicated that SC cuts crystal, has A, B, tri-kinds of vibration modes of C, and we need to use, is C mould 100MHz overtone oscillation frequency.A mould vibration ratio C mould is high by 87%, can not make troubles to circuit design, and B mould vibration frequency is only high by 9.4% than C mould, and its equivalent series resistance is suitable with C mould, sometimes even less, so the easier starting of oscillation of B mould, LC tuning network by collector electrode forms B mould Suppression network, make C mould overtone when vibration network be capacitive, and network is perception during B mode oscillation, thereby suppresses B mode oscillation.The equivalent series resistance of C mould fundamental frequency is very little, and therefore easily starting of oscillation adopts fundamental frequency Suppression network resonance FREQUENCY CONTROL out between fundamental frequency and three overtones, thereby make C mould fundamental frequency be perception, suppresses its base frequency oscillation.
Temperature control modules 3 is comprised of heater circuit and temperature control circuit, the output of temperature control circuit is connected with the input of heater circuit, for controlling the temperature spot of heater circuit output, heater circuit is used for to master-oscillator circuit, tuning network heats and remains under stationary temperature works, heater circuit passes through master-oscillator circuit, tuning network heats, make this partial circuit energy steady operation in steady temperature, this steady temperature point is controlled by temperature control circuit, temperature control circuit is high-accuracy direct current bridge-type temperature-adjusting circuit, (crystal is worked near inflection temperature to make thermostat temperature substantially remain on the inflection temperature of crystal, its frequency-temperature coefficient is minimum), allow crystal be operated in a constant inflection temperature environment.In described direct-current bridge, comprise thermistor, thermistor 7 is arranged between crystal resonator 8 and heating power pipe 9 and carries out quick temperature-sensitive, crystal resonator and heating power pipe are arranged in special conducting copper plate, after described temperature-adjusting circuit is the heating of heating power pipe, by thermistor, carry out temperature-sensitive, after resistance changes, operational amplifier is controlled amplidyne by computing output signal.
Amplify output module 4 and comprise the low cascode transistor of making an uproar mutually, LC tuning network, isolation filter network, the collector electrode of cascode transistor is connected with LC tuning network, the output of cascode transistor connects isolation filter network, and main feature is that selectivity is amplified required output frequency f
0, increase f
0power output suppresses f
0harmonic wave (containing subharmonic) reach to improve and optimize output signal object.Select the low transistor of making an uproar mutually to do oscillator stage oscillating tube, rationally debug transistor quiescent operation dotted state, the excitation of control crystal oscillation, make the low phase noise cancellation signal of crystal oscillator stable output, output circuit comprises LC network and isolation filter network, when further suppressing harmonic wave, reach the buffer action of oscillator signal output and load, improve load characteristic.
Copper coin is welded on to pcb board 6 relevant positions, high-power heating pipe heating surface is welded on copper plate 5, relevant position punching on copper plate 5, allows crystal resonator and transistor lead-in wire component's feet through copper coin, and crystal resonator shell is close to copper coin and is installed; Due to transistor shell and pin conducting, when being installed, transistor need make interval 0.2mm between triode bottom enclosure and copper coin.The heater circuit heating surface of temperature control modules 3 is welded on the thick copper plate 5 of 1.0mm, and copper plate is made 5 materials for thermostat heat transfer; Amplify the cascode transistor of output module 4, the pin of LC tuning network passes respectively copper plate 5, interval 0.2mm between cascode transistor bottom enclosure and copper plate; The shell of crystal oscillator oscillation module 2 is close to copper plate 5 and is installed, copper coin is welded on to pcb board 6 relevant positions, high-power heating pipe heating surface is welded on copper plate 5, relevant position punching on copper plate 5, allow crystal resonator and transistor lead-in wire component's feet through copper coin, crystal resonator shell is close to copper coin and is installed; Due to transistor shell and pin conducting, when being installed, transistor need make interval 0.2mm between triode bottom enclosure and copper coin.
Heater circuit comprises high-power heating pipe 9 and thermistor 7, high-power heating pipe 9, the pin of crystal resonator 8 and cascode transistor is all welded on pcb board 6 and is electrically connected to, the surrounding of cascode transistor is coated with silica gel, the silica gel scope applying shell bottom sides long 3/4 within, met like this installation provision of < < aerospace electron electric product components and parts through hole mount technology requirement > >, can make again the heat on copper plate 5 be delivered to fast on transistor, thereby the frequency stability of temperature index that guarantees crystal oscillator meets the demands.
The content not being described in detail in this specification belongs to the known prior art of professional and technical personnel in the field.
Claims (4)
1. a 100MHz high-frequency constant-temperature crystal oscillator for space flight, comprises power module (1) and the main module (2) of shaking, and it is characterized in that: also comprise temperature control modules (3) and amplify output module (4),
The output of described power module (1) is connected with pressurizer, the output of pressurizer connects respectively the main module (2) of shaking, temperature control modules (3) and amplifies output module (4), and power module (1) is undertaken to the main module (2) of shaking, temperature control modules (3) and amplification output module (4), powering after voltage stabilizing by pressurizer; The output of described temperature control modules (3) is connected with the input of the main module (2) of shaking, and the shake output of module (2) of described master is connected with the input of amplification output module (4);
Described crystal oscillator oscillation module (2) is comprised of master-oscillator circuit and tuning network, and the output of described master-oscillator circuit connects the input of described tuning network;
Described temperature control modules (3) is comprised of heater circuit and temperature control circuit, the output of described temperature control circuit is connected with the input of described heater circuit, for controlling the temperature spot of heater circuit output, the output of described heater circuit is connected with described master-oscillator circuit, tuning network respectively, for giving master-oscillator circuit, tuning network heats and remain under stationary temperature and work;
Described amplification output module (4) comprises cascode transistor, LC tuning network, isolation filter network, and the collector electrode of described cascode transistor is connected with LC tuning network, and the output of described cascode transistor connects isolation filter network.
2. 100MHz high-frequency constant-temperature crystal oscillator for space flight according to claim 1, is characterized in that: the heater circuit heating surface of described temperature control modules (3) is welded on copper plate (5); The cascode transistor of described amplification output module (4), the pin of LC tuning network pass respectively copper plate (5), interval 0.2mm between cascode transistor bottom enclosure and copper plate; The shell of crystal oscillator oscillation module (2) is close to copper plate (5) and is installed.
3. 100MHz high-frequency constant-temperature crystal oscillator for space flight according to claim 2, it is characterized in that: described heater circuit comprises high-power heating pipe and thermistor, the pin of high-power heating pipe, crystal oscillator oscillation module (2) and cascode transistor is all welded on pcb board and is electrically connected to, the surrounding of described cascode transistor is coated with silica gel, the silica gel scope of described coating shell bottom sides long 3/4 within, thermistor is arranged between crystal resonator and heating power pipe.
4. 100MHz high-frequency constant-temperature crystal oscillator for space flight according to claim 1 and 2, is characterized in that: the pressurizer that described power module (1) output connects is three terminal regulator.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106533363A (en) * | 2016-11-02 | 2017-03-22 | 河北鸿捷电子科技有限公司 | Multi-gate oscillation low-phase-noise constant-temperature crystal oscillator |
| CN109687865A (en) * | 2018-12-02 | 2019-04-26 | 南京中电熊猫晶体科技有限公司 | A kind of big pressure controlled constant tempeature crystal oscillator of small size |
| CN110581106A (en) * | 2018-06-07 | 2019-12-17 | 精工爱普生株式会社 | Oscillator, electronic apparatus, and moving object |
| CN113315472A (en) * | 2021-04-30 | 2021-08-27 | 武汉海创电子股份有限公司 | Special thick film circuit for space constant temperature crystal oscillator |
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| US6292066B1 (en) * | 1997-07-11 | 2001-09-18 | Matsushita Electric Industrial Co., Ltd. | Function generator, crystal oscillation device and method of adjusting crystal oscillation device |
| CN101860322A (en) * | 2010-05-10 | 2010-10-13 | 广东大普通信技术有限公司 | Automatic temperature controlled crystal oscillator |
| CN102522949A (en) * | 2011-12-20 | 2012-06-27 | 郑州原创电子科技有限公司 | Temperature compensation apparatus of constant temperature crystal oscillation circuit |
| CN203596811U (en) * | 2013-11-27 | 2014-05-14 | 武汉海创电子股份有限公司 | 100MHz high-frequency constant temperature crystal oscillator for spaceflight |
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2013
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Patent Citations (4)
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|---|---|---|---|---|
| US6292066B1 (en) * | 1997-07-11 | 2001-09-18 | Matsushita Electric Industrial Co., Ltd. | Function generator, crystal oscillation device and method of adjusting crystal oscillation device |
| CN101860322A (en) * | 2010-05-10 | 2010-10-13 | 广东大普通信技术有限公司 | Automatic temperature controlled crystal oscillator |
| CN102522949A (en) * | 2011-12-20 | 2012-06-27 | 郑州原创电子科技有限公司 | Temperature compensation apparatus of constant temperature crystal oscillation circuit |
| CN203596811U (en) * | 2013-11-27 | 2014-05-14 | 武汉海创电子股份有限公司 | 100MHz high-frequency constant temperature crystal oscillator for spaceflight |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106533363A (en) * | 2016-11-02 | 2017-03-22 | 河北鸿捷电子科技有限公司 | Multi-gate oscillation low-phase-noise constant-temperature crystal oscillator |
| CN110581106A (en) * | 2018-06-07 | 2019-12-17 | 精工爱普生株式会社 | Oscillator, electronic apparatus, and moving object |
| CN110581106B (en) * | 2018-06-07 | 2023-06-02 | 精工爱普生株式会社 | Oscillator, electronic apparatus, and moving object |
| CN109687865A (en) * | 2018-12-02 | 2019-04-26 | 南京中电熊猫晶体科技有限公司 | A kind of big pressure controlled constant tempeature crystal oscillator of small size |
| CN113315472A (en) * | 2021-04-30 | 2021-08-27 | 武汉海创电子股份有限公司 | Special thick film circuit for space constant temperature crystal oscillator |
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| CN103607198B (en) | 2017-02-15 |
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