CN106559070A - A kind of constant-temperature crystal oscillator - Google Patents
A kind of constant-temperature crystal oscillator Download PDFInfo
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- CN106559070A CN106559070A CN201610906047.3A CN201610906047A CN106559070A CN 106559070 A CN106559070 A CN 106559070A CN 201610906047 A CN201610906047 A CN 201610906047A CN 106559070 A CN106559070 A CN 106559070A
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- 239000013078 crystal Substances 0.000 title claims abstract description 96
- 230000010355 oscillation Effects 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 description 18
- 230000008859 change Effects 0.000 description 10
- 238000010586 diagram Methods 0.000 description 8
- 230000005611 electricity Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 239000010453 quartz Substances 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 241001499448 Heliodoxa imperatrix Species 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000005619 thermoelectricity Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L1/00—Stabilisation of generator output against variations of physical values, e.g. power supply
- H03L1/02—Stabilisation of generator output against variations of physical values, e.g. power supply against variations of temperature only
- H03L1/04—Constructional details for maintaining temperature constant
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Abstract
This application discloses a kind of constant-temperature crystal oscillator, solve the problems, such as that constant-temperature crystal oscillator temperature control precision is high, temperature-adjusting circuit is complicated.Constant-temperature crystal oscillator includes crystal oscillating circuit, temperature-adjusting circuit, heater circuit, biasing resistor, thermosensitive circuit, biasing resistor and thermosensitive circuit bleeder circuit in series, bleeder circuit one end is grounded, another termination supply voltage, TEMP voltage is drawn between thermistor and biasing circuit, temperature-adjusting circuit controls heater circuit according to the difference of TEMP voltage and reference voltage, crystal oscillating circuit is heated, thermosensitive circuit includes the first thermistor, for detecting the temperature of crystal oscillating circuit；And second thermistor, for detecting ambient temperature.First thermistor is connected in series with the second thermistor.The present invention can accurately guarantee the working temperature constant of crystal oscillator；The simple structure of the constant-temperature crystal oscillator of the present invention, not only easily debugs, and being capable of reduces cost.
Description
Technical field
The application is related to technical field of electronic equipment, more particularly to a kind of constant-temperature crystal oscillator.
Background technology
The characteristics of quartz oscillator has small volume, frequency stability is high, thus it is extensive as reference frequency source
It is applied to the skills such as communication, mobile telephone system, global positioning system, navigation, remote control, Aero-Space and accurate measuring instrument
Art field.
Changed due to characteristic (such as frequency etc.) the meeting variation with temperature of quartz oscillator, therefore to make quartz
Crystal oscillator steady operation, needs to make quartz oscillator work at a constant temperature.Using thermostat or temperature-constant plate
Keep constant temperature carrying out precise temperature control inside crystal oscillator, it is possible to achieve constant-temperature crystal oscillator.
Usually, temperature-detecting device is set in the thermostat or temperature-constant plate, changes for sense temperature, produce control
Warm voltage, heats to the crystal oscillator.But, with the change of ambient temperature, its actual work temperature
Can change.The constant-temperature crystal oscillator of prior art has that temperature-controlled precision is not high.To solve the above problems, some schemes
Propose multistage temperature-adjusting circuit or integrating circuit added on the basis of single-stage temperature-adjusting circuit, although temperature-controlled precision can be improved,
But, due to the increase and the complication of circuit of component quantity, not only cost can be improved, the difficulty for designing and debugging also with
Increase.
The content of the invention
The present invention proposes a kind of constant-temperature crystal oscillator, and solution constant-temperature crystal oscillator temperature control precision is not high, temperature control
The complicated problem of circuit.
The embodiment of the present application provides a kind of constant-temperature crystal oscillator, comprising crystal oscillating circuit, temperature-adjusting circuit, heating electricity
Road, biasing resistor, thermosensitive circuit, the biasing resistor and thermosensitive circuit bleeder circuit in series, the bleeder circuit
One end is grounded, another termination supply voltage；TEMP voltage, institute are drawn between the thermosensitive circuit and the biasing resistor
State temperature-adjusting circuit and the heater circuit is controlled according to the difference of the TEMP voltage and reference voltage, to the crystal oscillation
Circuit is heated；The thermosensitive circuit includes the first thermistor, the second thermistor；First thermistor is used to detect institute
State the temperature of crystal oscillating circuit；Second thermistor, for detecting ambient temperature；First thermistor with
Second thermistor is connected in series.
Preferably, first thermistor and second thermistor are negative tempperature coefficient thermistor；Or,
First thermistor and second thermistor are semistor.
Preferably, the TEMP voltage is more than the reference voltage, and raises with temperature and reduce；Or, institute
TEMP voltage is stated less than the reference voltage, and is raised with temperature and is increased.
Used as the embodiment that the present invention further optimizes, comprising temperature-constant plate, first thermistor and the crystal shake
Swing circuit to be set along on the temperature-constant plate；
As the present invention further optimization, and the embodiment that can select, comprising thermostat, first thermistor and
The crystal oscillating circuit is set along in the thermostat；Or
The crystal oscillating circuit is arranged in the thermostat, and first thermistor is arranged on the thermostat
On outer wall.
Preferably, second thermistor is away from the temperature-constant plate；Or, second thermistor is away from the perseverance
Warm groove.
Preferably, second thermistor is be serially connected multiple, is arranged on the surrounding of the crystal oscillator.Enter
Preferably, quantity 2-4 of second thermistor is individual for one step.
Above-mentioned at least one technical scheme that the embodiment of the present application is adopted can reach following beneficial effect：
The perseverance of a kind of simple structure of the embodiment of the present application offer, the accurately working temperature constant of holding crystal oscillator
Temperature crystal oscillator.According to the present invention, even if ambient temperature changes greatly, it is also possible to accurately guarantee crystal oscillator
Working temperature constant；The simple structure of the constant-temperature crystal oscillator of the present invention, not only easily debugs, and being capable of reduces cost.
Description of the drawings
Accompanying drawing described herein is used for providing further understanding of the present application, constitutes the part of the application, this Shen
Schematic description and description please does not constitute the improper restriction to the application for explaining the application.In the accompanying drawings：
Fig. 1 is the block diagram of the schematic structure of the constant-temperature crystal oscillator of prior art；
Fig. 2 is the embodiment block diagram of constant-temperature crystal oscillator of the present invention；
Fig. 3 is the partial block diagram of another embodiment that constant-temperature crystal oscillator of the present invention is related to；
Fig. 4 is embodiment block diagram of the constant-temperature crystal oscillator of the present invention comprising multiple second thermistors.
Specific embodiment
To make purpose, technical scheme and the advantage of the application clearer, below in conjunction with the application specific embodiment and
Corresponding accompanying drawing is clearly and completely described to technical scheme.Obviously, described embodiment is only the application one
Section Example, rather than the embodiment of whole.Based on the embodiment in the application, those of ordinary skill in the art are not doing
The every other embodiment obtained under the premise of going out creative work, belongs to the scope of the application protection.
Below in conjunction with accompanying drawing, the technical scheme that each embodiment of the application is provided is described in detail.In figure, 1：Constant temperature crystal vibrates
Device (prior art), 2-4：Constant-temperature crystal oscillator (present invention), 11,21：Crystal oscillating circuit, 12,22：Heater circuit, 13,
23：Temperature-adjusting circuit, R0：Biasing resistor, R1：First thermistor, R2, R21, R22：Second thermistor.
Fig. 1 is the block diagram of the schematic structure of the constant-temperature crystal oscillator of prior art.As prior art, it is known that as schemed
Constant-temperature crystal oscillator 1 shown in 1, the constant-temperature crystal oscillator include crystal oscillating circuit 11, heater circuit 12, temperature-adjusting circuit
13rd, and for detecting thermistor (temperature sensor) R1 of the temperature of crystal oscillating circuit.Wherein, generally by crystal oscillation
Circuit 11 (or wherein needing to keep the part of constant temperature) and the thermistor R1 as temperature sensor be arranged on temperature-constant plate or
In thermostat, thermistor is the thermistor with negative temperature coefficient.
The principle of control temperature of the constant-temperature crystal oscillator of prior art is as follows.By taking negative tempperature coefficient thermistor as an example, temperature-sensitive
One end ground connection of resistance R1, the other end are connected in series with biasing resistor R0, and the biasing resistor R0 is connected with supply voltage U.Heat
Quick resistance R1 and biasing resistor R0 constitute bleeder circuit, by the temperature of crystal oscillating circuit 11 with voltage (from thermistor R1 with
Between biasing resistor R0 draw) form be supplied to temperature-adjusting circuit 13.The resistance of biasing resistor R0 is according to crystal oscillating circuit 11
Actual work temperature requirement predefine, the resistance value of the biasing resistor is fixed value.Temperature-adjusting circuit 13 will be by partial pressure
The voltage that circuit is provided is compared with reference voltage U0, and controls heater circuit 12 to crystal oscillation electricity according to both differences
The heating power on road 11.
Specifically, the characteristic that negative tempperature coefficient thermistor R1 has its resistance as temperature is raised and reduces.Work as the external world
When temperature is reduced and the temperature of crystal oscillating circuit 11 and thermistor R1 is also decreased, the resistance of thermistor R1 increases
Greatly, therefore bleeder circuit is supplied to the voltage of temperature-adjusting circuit 13 also to increase, and then the voltage is also increased with the difference of reference voltage,
Temperature-adjusting circuit 13 increases the heating power of heater circuit 12.Hereafter, as the temperature of crystal oscillating circuit 11 gradually rises, heat
The resistance of quick resistance R1 is gradually lowered, and is finally reached new thermal equilibrium state, hereafter, maintains the thermal equilibrium state, until outside
Environment temperature is changed again.
However, in the case of constant-temperature crystal oscillator 1 more than, being by the heating power of heater circuit and extraneous ring
The heat loss that border is caused reaches thermal balance to keep the temperature constant of crystal oscillating circuit 11.It is under thermal equilibrium state, different
The different heating power of ambient temperature correspondence, different heating powers are provided not to temperature-adjusting circuit 13 with bleeder circuit again
Same voltage correspondence.Because biasing resistor R0 is fixed resistance, the different voltage that bleeder circuit is provided again from it is different
Resistance (crystal oscillating circuit temperature) correspondence of thermistor R1.In other words, when new thermal equilibrium state is reached, crystal shakes
The temperature for swinging circuit 11 also there occurs change.Therefore, the constant-temperature crystal oscillator 1 of prior art has that temperature-controlled precision is not high to ask
Topic, with the change of ambient temperature, its actual work temperature can also change.
Fig. 2 is the embodiment block diagram of constant-temperature crystal oscillator of the present invention.For purposes of illustration only, eliminating known in some in Fig. 2
Structure, such as power supply circuits, feedback circuit etc..
The present embodiment provides a kind of constant-temperature crystal oscillator 2, comprising crystal oscillating circuit 21, temperature-adjusting circuit 23, heating electricity
Road 22, biasing resistor R0, the first thermistor R1, the second thermistor R2, the first thermistor R1 are used to detect described
The temperature of crystal oscillating circuit, the second thermistor R2 are used to detect ambient temperature；The first thermistor R1
Be connected in series with the second thermistor R2, constitute thermosensitive circuit, the thermosensitive circuit further with the biasing resistor R0
It is connected in series, constitutes bleeder circuit, the bleeder circuit is grounded, is terminated in the biasing resistor one in described thermosensitive circuit one end
Supply voltage U.
The temperature-adjusting circuit has two inputs, and an input is connected to the temperature-sensitive electricity in the bleeder circuit
Between road and the biasing resistor R0, the input voltage of generation is TEMP voltage；Another input input reference voltage
U0, the difference of the voltage that the temperature-adjusting circuit is input into according to described two inputs control the heating power of heater circuit.It is described
Heater circuit is for crystal oscillating circuit heating.
First thermistor and second thermistor are negative tempperature coefficient thermistor, the TEMP
Voltage is more than the reference voltage U0, and raises with temperature and reduce；
Or, first thermistor and second thermistor are semistor, the temperature
Degree sensing voltage is less than the reference voltage U0, and raises with temperature and increase.
Used as the specific embodiment of the present invention, the temperature-adjusting circuit is operational amplification circuit；The heater circuit is by thermoelectricity
The heating element heater of resistance structure is constituted；The heater circuit is made up of power tube.
As the embodiment that further optimizes of the present invention, first thermistor and the crystal oscillating circuit (or its
The middle part for needing to keep constant temperature) it is set along on temperature-constant plate, and first thermistor is made as close possible to described
Crystal oscillating circuit so that the first thermistor reflects the temperature of crystal oscillating circuit exactly.Now, although the second temperature-sensitive electricity
Resistance can also be arranged on temperature-constant plate, and away from crystal oscillating circuit, it is preferred that the second thermistor is arranged on constant temperature
Outside plate, temperature-controlled precision is improved.
In addition, in order that heating evenly, make the first thermistor R1 more accurately detect the temperature of crystal oscillating circuit 21
Crystal oscillating circuit 21 (or wherein can be needed to keep constant temperature by degree, and protect crystal oscillating circuit 21 by external damage
Part) be arranged in thermostat.Now, the first thermistor R1 can be set along in thermostat, it is also possible to be arranged on
On thermostat outer wall, it is preferred that being set along in thermostat with crystal oscillating circuit 21.As long as the second thermistor R2 sets
Put other the suitable positions beyond thermostat.
Hereinafter, the operation principle that the constant-temperature crystal oscillator 2 of present embodiment carries out temperature control is illustrated.
In the constant temperature oscillator 2 of the present embodiment, the first thermistor R1 and the second thermistor R2 constitutes thermosensitive circuit,
And then bleeder circuit is constituted with biasing resistor R0.Bleeder circuit is in one end of thermosensitive circuit (specifically, the second thermistor R2)
Ground connection, and be connected with supply voltage in one end of biasing resistor R0, the resistance of biasing resistor R0 can be according to crystal oscillation electricity
The required operating temperature on road 21 and the ambient temperature of setting are predefined.
Temperature-adjusting circuit 23 has two inputs, and an input is connected between thermosensitive circuit and biasing resistor R0 (tool
Body ground, between the first thermistor R1 and biasing resistor R0), another input input reference voltage.23 basis of temperature-adjusting circuit
The difference of the voltage of two input inputs controls the heating power of heater circuit 22.Temperature-adjusting circuit 23 can be operation amplifier electricity
Road.
So that first thermistor and the second thermistor are negative temperature coefficient as an example, when constant-temperature crystal oscillator 2
In required operating temperature steady operation, if ambient temperature is reduced, because the second thermistor R2 detections is
Ambient temperature, therefore the temperature of the second thermistor R2 quickly reduced than the temperature of the first thermistor R1, correspondingly,
The resistance of the second thermistor R2 increases therewith, so that bleeder circuit is supplied to the TEMP voltage liter of temperature-adjusting circuit 23
Height, which is increased with the difference of reference voltage, so as to temperature-adjusting circuit 23 increases the heating power of heater circuit 22.So, outside
When portion's environment temperature is reduced, the heating work(of heater circuit 22 can be finally improved by the resistance increase of the second thermistor R2
Rate, so as to reach new thermal equilibrium state with the ambient temperature after reduction.Due to the impact quilt of ambient temperature change
Second thermistor R2 is absorbed, therefore, the resistance of the first thermistor R1 can keep constant or change very little, i.e. brilliant
The temperature of oscillation body circuit 21 keeps constant or changes very little.
According to the present invention, by the second independent thermistor R2 (temperature sensor) for being provided with detection external temperature,
So as to the change of ambient temperature can not only be reflected rapidly, and external environment condition can be undertaken by the second thermistor R2
The impact of temperature change, makes the first thermistor R1 unaffected or the impacted very little of institute such that it is able to greatly improve constant temperature
The temperature-controlled precision of crystal oscillator.
In addition, as needed, the position of the first thermistor R1 and the second thermistor R2 in the thermosensitive circuit in Fig. 2
Can exchange.
Fig. 3 is the partial block diagram of another embodiment that constant-temperature crystal oscillator of the present invention is related to.In figure 3, the partial pressure
Circuit is grounded, terminates supply voltage U in the thermosensitive circuit one in described biasing resistor one end.
First thermistor and second thermistor are negative tempperature coefficient thermistor, the TEMP
Voltage is less than the reference voltage U0, and raises with temperature and increase；
Or, first thermistor and second thermistor are semistor, the temperature
Degree sensing voltage is more than the reference voltage U0, and raises with temperature and reduce.
In addition, other structures are identical with embodiment illustrated in fig. 2, therefore Fig. 3 only represents the constant temperature crystal vibration
A part for device.
As needed, the first thermistor R1 in thermosensitive circuit can also be exchanged with the position of the second thermistor R2.
Fig. 4 is embodiment block diagram of the constant-temperature crystal oscillator of the present invention comprising multiple second thermistors.Preferably, it is described
Second thermistor is be serially connected multiple, is arranged on the surrounding of the crystal oscillator.It is further preferred that described second
Quantity 2-4 of thermistor.
Difference of Fig. 4 illustrated embodiments from Fig. 1-2 is to be provided with two second thermistors R21, R22, remaining
Structure is identical with Fig. 2.Can by two second thermistors R21, R22 be separately positioned on constant-temperature crystal oscillator except thermostat
Different position in addition.The set location of two thermistors R21, R22 is not particularly limited, as long as can react exactly
The change of ambient temperature.For example, the diagonally adjacent two ends of constant-temperature crystal oscillator can be arranged on, or
It is arranged on left and right two ends or the upper and lower ends of constant-temperature crystal oscillator.
Further, the second thermistor can also be arranged in series two or more.For example, 4 the second thermistors can be set,
In such a case it is possible to they are separately positioned on four angles of constant-temperature crystal oscillator.
In the case where multiple second thermistors are provided with, the series sequence of each thermistor in thermosensitive circuit does not have
It is particularly limited to.
But, when the quantity of the second thermistor increases, on the one hand it is not easy to guarantee their set location, the opposing party
Face, cost also can be improved therewith, and the quantity of the second thermistor increases brought effect and can also become unobvious.Therefore,
It is preferably provided with 2-4.
It should be noted that with regard to heater circuit, the heating element heater of thermal resistance structure can be adopted, it would however also be possible to employ utilize
The power tube of pipe power consumption heating, can also adopt the radiating element of electromagenetic wave radiation mode.And, the heating element heater, power
Pipe and radiating element can be provided with it is multiple, so as to realize uniform heating.For the constant temperature crystal of constant temperature slot structure shakes
Device is swung, is to reduce radiation loss, it is also possible to which radiation protective layer is set in thermostat inwall.
Also, it should be noted that term " including ", "comprising" or its any other variant are intended to nonexcludability
Comprising so that a series of process, method, commodity or equipment including key elements not only includes those key elements, but also wrapping
Other key elements being not expressly set out are included, or also includes intrinsic for this process, method, commodity or equipment wanting
Element.In the absence of more restrictions, the key element for being limited by sentence "including a ...", it is not excluded that wanting including described
The process of element, method, also there is other identical element in commodity or equipment.
Embodiments herein is the foregoing is only, the application is not limited to.For those skilled in the art
For, the application can have various modifications and variations.All any modifications made within spirit herein and principle, equivalent
Replace, improve etc., within the scope of should be included in claims hereof.
Claims (10)
1. a kind of constant-temperature crystal oscillator, it is characterised in that
Comprising crystal oscillating circuit, temperature-adjusting circuit, heater circuit, biasing resistor, thermosensitive circuit；
The biasing resistor and thermosensitive circuit bleeder circuit in series, bleeder circuit one end ground connection, another termination
Supply voltage；
TEMP voltage is drawn between the thermosensitive circuit and the biasing resistor；
The temperature-adjusting circuit controls the heater circuit according to the difference of the TEMP voltage and reference voltage, to the crystalline substance
Oscillation body circuit is heated；
The thermosensitive circuit includes the first thermistor, the second thermistor；
First thermistor, for detecting the temperature of the crystal oscillating circuit；
Second thermistor, for detecting ambient temperature；
First thermistor is connected in series with second thermistor.
2. constant-temperature crystal oscillator as claimed in claim 1, it is characterised in that
First thermistor and second thermistor are negative tempperature coefficient thermistor；Or
First thermistor and second thermistor are semistor.
3. constant-temperature crystal oscillator as claimed in claim 1, it is characterised in that
The TEMP voltage is more than the reference voltage, and raises with temperature and reduce；Or
The TEMP voltage is less than the reference voltage, and raises with temperature and increase.
4. constant-temperature crystal oscillator as claimed in claim 1, it is characterised in that
The bleeder circuit is grounded, terminates supply voltage in the biasing resistor one in described thermosensitive circuit one end；Or
The bleeder circuit is grounded, terminates supply voltage in the thermosensitive circuit one in described biasing resistor one end.
5. the constant-temperature crystal oscillator as described in claim 1-4 any one, comprising temperature-constant plate, it is characterised in that
First thermistor and the crystal oscillating circuit are set along on the temperature-constant plate.
6. the constant-temperature crystal oscillator as described in claim 1-4 any one, comprising thermostat, it is characterised in that
First thermistor and the crystal oscillating circuit are set along in the thermostat；Or
The crystal oscillating circuit is arranged in the thermostat, and first thermistor is arranged on the outer wall of the thermostat
On.
7. constant-temperature crystal oscillator as claimed in claim 5, it is characterised in that
Second thermistor is away from the temperature-constant plate.
8. as claimed in claim 6 constant-temperature crystal oscillator, it is characterised in that
Second thermistor is away from the thermostat.
9. the constant-temperature crystal oscillator as described in claim 7-8 any one, it is characterised in that
Second thermistor is be serially connected multiple, is arranged on the surrounding of the constant-temperature crystal oscillator.
10. constant-temperature crystal oscillator as claimed in claim 9, it is characterised in that
Quantity 2-4 of second thermistor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610906047.3A CN106559070A (en) | 2016-10-18 | 2016-10-18 | A kind of constant-temperature crystal oscillator |
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| CN201610906047.3A CN106559070A (en) | 2016-10-18 | 2016-10-18 | A kind of constant-temperature crystal oscillator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024050842A1 (en) * | 2022-09-09 | 2024-03-14 | 华为技术有限公司 | Package structure and electronic device |
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Application publication date: 20170405 |
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