CN109347443A - A kind of constant-temperature crystal oscillator and its working method - Google Patents
A kind of constant-temperature crystal oscillator and its working method Download PDFInfo
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- CN109347443A CN109347443A CN201811594185.8A CN201811594185A CN109347443A CN 109347443 A CN109347443 A CN 109347443A CN 201811594185 A CN201811594185 A CN 201811594185A CN 109347443 A CN109347443 A CN 109347443A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/30—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator
- H03B5/32—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator
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Abstract
The invention belongs to constant temperature quartz oscillator technical field, in particular to a kind of constant-temperature crystal oscillator, comprising: analog switch is separately connected with the master-oscillator and compensation crystal oscillator of constant-temperature crystal oscillator, also connect with temperature sensing circuit；Voltage regulator circuit (1), connect with temperature-adjusting circuit and the temperature sensing circuit respectively；The master-oscillator of the constant-temperature crystal oscillator is connect with isolation buffer grade (1)；The compensation crystal oscillator is connect with isolation buffer grade (2), amplification output stage is separately connected with the isolation buffer grade (1) and the isolation buffer grade (2), when so that constant-temperature crystal oscillator starting, its output frequency is compensation crystal oscillator frequency, and when flat-temperature zone temperature is warming up to close to constant temperature point, output frequency is switched to the frequency of constant-temperature crystal oscillator itself, and the starting frequency difference for reducing constant-temperature crystal oscillator is achieved the purpose that with this.
Description
Technical field
The invention belongs to constant temperature quartz oscillator technical field, in particular to a kind of constant-temperature crystal oscillator and its work
Make method.
Background technique
Constant-temperature crystal oscillator because have very high frequency stability, excellent aging characteristics, be widely used in communication,
In radar, navigation, remote sensing and measuring instrument, as the frequency source or time reference of electronic system, performance height is directly affected
Even determine the performance of electronic system.
Constant-temperature crystal oscillator is after steady operation, and for frequency near nominal frequency, frequency accuracy is very high, usually excellent
In 1E-7.But in starting up, the original frequency and nominal frequency deviation of constant-temperature crystal oscillator are very big, reach tens
Ppm, this frequency departure are referred to as to originate frequency difference, it is a kind of inherent characteristic of constant-temperature crystal oscillator.For example, for common
10MHz constant-temperature crystal oscillator, starting frequency difference is about 30ppm under room temperature, and starting frequency difference may be bigger under low temperature, even
It can be more than 60ppm.
It is fatal that the presence for originating frequency difference, which is for workable occasion for some requirements booting,.In such case
Under, constant-temperature crystal oscillator output frequency has two, first is that frequency and nominal frequency deviation are excessive, will lead to complete machine and opens
Machine stage work is abnormal；Second is that (generally a few minutes) frequency in stable this period acute variation can occur for booting,
It is unstable, when being applied to the occasions such as radio station can due to frequency acute variation phenomenon of uttering long and high-pitched sounds, influence using.
Summary of the invention
In order at least solve above-mentioned technical problem, the present invention provides a kind of constant-temperature crystal oscillator and its working methods.
According to a first aspect of the present invention, a kind of constant-temperature crystal oscillator is provided, comprising:
Analog switch is separately connected with the master-oscillator and compensation crystal oscillator of constant-temperature crystal oscillator, is also passed with temperature
Inductive circuit connection；Voltage regulator circuit (1), connect with temperature-adjusting circuit and the temperature sensing circuit respectively；The constant temperature crystal oscillation
The master-oscillator of device is connect with isolation buffer grade (1)；The compensation crystal oscillator is connect with isolation buffer grade (2), amplification output
Grade is separately connected with the isolation buffer grade (1) and the isolation buffer grade (2).
Optionally, further includes:
Voltage regulator circuit (2), connect with power supply and the analog switch respectively.
Further, the analog switch, for controlling the constant temperature crystal when constant-temperature crystal oscillator is powered on and starts
The master-oscillator of oscillator does not work；The compensation crystal oscillator work.
Further, the analog switch is also used to detect the constant temperature crystal oscillation in the temperature sensing circuit
When device flat-temperature zone temperature reaches constant temperature point, controls the compensation crystal oscillator and do not work, the master of the constant-temperature crystal oscillator
Vibration level works normally.
Preferably, the temperature-adjusting circuit uses proportional integration temperature-adjusting circuit.
Preferably, the constant-temperature crystal oscillator master-oscillator uses Pierre's Si parallel oscillatory circuit.
Preferably, the frequency of the compensation crystal oscillator is identical as the frequency of the constant-temperature crystal oscillator master-oscillator.
On the other hand, the present invention provides a kind of temperature sensing circuit of constant-temperature crystal oscillator, comprising:
Constant-temperature crystal oscillator power-up starting, analog switch logic control incoming level are high level, and switch S1 opens S2
Closure, control constant-temperature crystal oscillator master-oscillator do not work, compensation crystal oscillator work, export as compensation crystal oscillator frequency
Rate；
After being powered on work, when flat-temperature zone, temperature surmounts setting value, and thermistor RT2 resistance value is less than desired temperature resistance
Rset, temperature sensing circuit output voltage become zero, and analog switch logic control incoming level becomes low level, switch S1 closure
S2 is opened, and compensation crystal oscillator does not work, the work of constant-temperature crystal oscillator master-oscillator, is exported as constant-temperature crystal oscillator frequency
Rate.
On the other hand, the present invention provides a kind of working method of constant-temperature crystal oscillator, comprising:
In the case of being powered on starting, by controlling analog switch, the master-oscillator for controlling constant-temperature crystal oscillator does not work,
Compensation crystal oscillator work, the output frequency for controlling compensation crystal oscillator are defeated by corresponding isolation buffer grade circuit
Enter the amplification output stage to constant-temperature crystal oscillator, and exports；
In the case where use temperature sensing circuit detects flat-temperature zone temperature and reaches constant temperature point, analog switch is controlled, is made
It obtains compensation crystal oscillator not work, master-oscillator institute's making alive of constant-temperature crystal oscillator is its operating voltage, constant temperature crystal vibration
The amplification that the output frequency for swinging device master-oscillator is input to constant-temperature crystal oscillator by corresponding isolation buffer grade circuit is defeated
Grade out, and export.
Beneficial effects of the present invention:
Constant-temperature crystal oscillator of the present invention on startup, using compensation crystal oscillator frequency as output frequency, due to
Its frequency temperature stability of compensation crystal oscillator is better than 1ppm in wide temperature range, it is ensured that constant-temperature crystal oscillator rises
Beginning frequency difference is better than 1ppm；When flat-temperature zone, temperature is warming up to close to constant temperature point, output frequency be switched to constant-temperature crystal oscillator from
The frequency of body, and the crystal resonator due to being now in flat-temperature zone its temperature, very close to constant temperature point, output frequency is very
Close to nominal frequency.By this method, the starting frequency difference of constant-temperature crystal oscillator can be reduced, is controlled within 1ppm.
Detailed description of the invention
Above-mentioned and/or additional aspect and advantage of the invention will become from the following description of the accompanying drawings of embodiments
Obviously and it is readily appreciated that, wherein
Fig. 1 is a kind of flow chart of the working method of constant-temperature crystal oscillator provided by the invention；
Fig. 2 is a kind of constant-temperature crystal oscillator structural block diagram provided by the invention；
Fig. 3 is a kind of temperature sensing circuit figure provided by the invention.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, and for explaining only the invention, and is not construed as limiting the claims.
In order to illustrate more clearly of the present invention, the present invention is done further below with reference to preferred embodiments and drawings
It is bright.Similar component is indicated in attached drawing with identical appended drawing reference.It will be appreciated by those skilled in the art that institute is specific below
The content of description is illustrative and be not restrictive, and should not be limited the scope of the invention with this.
The present invention provides a kind of working method of constant-temperature crystal oscillator, as shown in Figure 1, comprising:
Step 101: in the case of being powered on starting, by controlling analog switch, controlling the main vibration of constant-temperature crystal oscillator
Grade does not work, and compensation crystal oscillator work executes step 102；
In embodiments of the present invention, when constant-temperature crystal oscillator, which is powered on, to be started, under the control of analog switch, constant temperature is brilliant
The master-oscillator institute making alive of oscillation body device is zero, and master-oscillator does not work；Compensation crystal oscillator institute's making alive is its nominal operation
Voltage, compensation crystal oscillator work.
In the embodiment of the present invention, the compensation crystal oscillator of a same frequency is set, and frequency temperature stability is in wide temperature
It spends and is better than 1ppm in range；In addition it is provided with an analog switch, switching time delay is less than 20ns.
Optionally, in the embodiment of the present invention, compensation crystal oscillator is arranged far to the position of pyrotoxin, and is taken
The measure for reducing heat transmitting, can make the temperature change of compensation crystal oscillator gentle in this way, be unlikely to excessively acutely, with this
Avoid high temperature variation to the adverse effect of compensation crystal oscillator output frequency.
Further, using microminiature compensation crystal oscillator, reduce the temperature ladder of compensation crystal oscillator therein
Degree can make compensation crystal oscillator in constant-temperature crystal oscillator start process the case where the variation of flat-temperature zone high temperature in this way
Under in full warm area keep its frequency temperature stability.
In embodiments of the present invention, when analog switch is set, the mould of high switching rate, low-power consumption, low on-resistance is selected
Quasi- switch.Switching logic control input voltage is generated by temperature sensing circuit.Temperature sensing circuit is put by thermistor and operation
The comparator composition that big device is constituted, the working principle of the circuit are, when thermistor measures flat-temperature zone temperature higher than a certain setting
When value, circuit output voltage is become zero by high level (+5V).The desired temperature is close but slightly below constant temperature point temperature.
Preferably, constant-temperature crystal oscillator master-oscillator uses general Pierre's Si parallel oscillatory circuit.
Step 102: the output frequency for controlling compensation crystal oscillator is inputted by corresponding isolation buffer grade circuit
To the amplification output stage of constant-temperature crystal oscillator, and export.
The output frequency of compensation crystal oscillator is slow by the isolation of corresponding setting first in embodiments of the present invention
It rushes grade circuit to be handled, then is input to the amplification output stage of constant-temperature crystal oscillator and is handled, output final process obtains
Frequency.
By this set, when constant-temperature crystal oscillator starting, output frequency is compensation crystal oscillator frequency, by
In compensation crystal oscillator, its frequency temperature stability is better than 1ppm in wide temperature range, it is ensured that constant-temperature crystal oscillator
It originates frequency difference and is better than 1ppm.
Step 103: in the case where use temperature sensing circuit detects flat-temperature zone temperature and reaches constant temperature point, control simulation
Switch, so that master-oscillator institute's making alive of constant-temperature crystal oscillator is its operating voltage, compensation crystal oscillator does not work, and executes
Step 104；
In embodiments of the present invention, after power-up starts a period of time, when temperature sensing circuit detects constant temperature crystal vibration
Swing device flat-temperature zone temperature very close to constant temperature point be even up to constant temperature point when, the switch state for controlling analog switch switches,
So that master-oscillator institute's making alive of constant-temperature crystal oscillator is its normal working voltage, and compensation crystal oscillator institute making alive is
Zero.Constant-temperature crystal oscillator master-oscillator works normally at this time；And compensation crystal oscillator does not work.
Step 104: the output frequency of constant-temperature crystal oscillator master-oscillator is defeated by corresponding isolation buffer grade circuit
Enter the amplification output stage to constant-temperature crystal oscillator, and exports.
In embodiments of the present invention, the output frequency of constant-temperature crystal oscillator master-oscillator passes through corresponding setting first
Isolation buffer grade circuit is handled, then is input to the amplification output stage of constant-temperature crystal oscillator and is handled, and final place is exported
Manage obtained frequency.
In embodiments of the present invention, when flat-temperature zone, temperature is warming up to close to constant temperature point, output frequency is switched to constant temperature crystalline substance
The frequency of oscillation body device itself, and the crystal resonator due to being now in flat-temperature zone its temperature is very close to constant temperature point,
Output frequency is very close to nominal frequency.By this method, can by the starting frequency difference of constant-temperature crystal oscillator control 1ppm with
It is interior.
In embodiments of the present invention, the constant-temperature crystal oscillator master-oscillator in constant-temperature crystal oscillator and compensation crystal vibrate
Device is respectively set independent isolation buffer grade and is linked into amplification output stage, can reduce master-oscillator and compensation crystal oscillator as far as possible
Between interact, and guarantee after constant-temperature crystal oscillator steady operation, compensation crystal oscillator circuit branch is to its shadow
It rings close to zero.
On the other hand, the embodiment of the present invention provides a kind of constant-temperature crystal oscillator, as shown in Figure 2, comprising:
Analog switch is separately connected with the master-oscillator and compensation crystal oscillator of constant-temperature crystal oscillator, is also passed with temperature
Inductive circuit connection, voltage regulator circuit (1) are connect with temperature-adjusting circuit and temperature sensing circuit respectively, the main vibration of constant-temperature crystal oscillator
Grade is connect with isolation buffer grade (1), and compensation crystal oscillator is connect with isolation buffer grade (2), amplifies output stage and isolation buffer
Grade (1) and isolation buffer grade (2) are separately connected.Wherein, the main vibration of the frequency of compensation crystal oscillator and constant-temperature crystal oscillator
The frequency of grade is identical.
Further, in the embodiment of the present invention, further includes:
Voltage regulator circuit (1), connect with power supply, temperature-adjusting circuit and temperature sensing circuit respectively.
Further, further includes:
Voltage regulator circuit (2), connect with power supply and analog switch respectively.
In embodiments of the present invention, analog switch, for controlling constant temperature crystal when constant-temperature crystal oscillator is powered on and starts
The master-oscillator of oscillator does not work；Compensation crystal oscillator work.
Analog switch, is also used to detect constant-temperature crystal oscillator flat-temperature zone temperature in temperature sensing circuit and reaches constant temperature point
When, control compensation crystal oscillator does not work, and the master-oscillator of constant-temperature crystal oscillator works normally.
Temperature-adjusting circuit uses proportional integration temperature-adjusting circuit.
Preferably, constant-temperature crystal oscillator master-oscillator is stated using Pierre's Si parallel oscillatory circuit.
In conjunction with a kind of above-mentioned constant-temperature crystal oscillator technical solution, illustrate in detail below:
The present invention is provided with the compensation crystal oscillator of a same frequency, and frequency temperature stability is in wide temperature range
Better than 1ppm；In addition it is provided with an analog switch, switching time delay is less than 20ns；It is vibrated simultaneously for constant temperature crystal
Device master-oscillator and compensation crystal oscillator are respectively provided with respective isolation buffer grade circuit.
When constant-temperature crystal oscillator, which is powered on, to be started, under the control of analog switch, the master-oscillator of constant-temperature crystal oscillator
Institute's making alive is zero, and master-oscillator does not work；Compensation crystal oscillator institute's making alive is its nominal operating voltage, compensation crystal oscillation
Device work, output frequency are input to the amplification output stage of constant-temperature crystal oscillator by its isolation buffer grade circuit, and final
Output.Power-up after a period of work, when to detect constant-temperature crystal oscillator flat-temperature zone temperature very close for temperature sensing circuit
When constant temperature point, the switch state of analog switch switches so that master-oscillator institute's making alive of constant-temperature crystal oscillator be its just
Normal operating voltage, and compensation crystal oscillator institute making alive is zero.Constant-temperature crystal oscillator master-oscillator works normally at this time, defeated
Frequency is input to the amplification output stage of constant-temperature crystal oscillator, and final output by its isolation buffer grade circuit out；And temperature compensation
Crystal oscillator does not work.
By this set, when constant-temperature crystal oscillator starting, output frequency is compensation crystal oscillator frequency, by
In compensation crystal oscillator, its frequency temperature stability is better than 1ppm in wide temperature range, it is ensured that constant-temperature crystal oscillator
It originates frequency difference and is better than 1ppm；When flat-temperature zone, temperature is warming up to close to constant temperature point, output frequency is switched to constant-temperature crystal oscillator
The frequency of itself, and the crystal resonator due to being now in flat-temperature zone its temperature is very close to constant temperature point, output frequency
Very close to nominal frequency.By this method, the starting frequency difference of constant-temperature crystal oscillator can be controlled within 1ppm.
The present invention fully takes into account inside constant-temperature crystal oscillator during heating when compensation crystal oscillator is arranged
The case where high temperature changes is reduction high temperature variation to the adverse effect of compensation crystal oscillator output frequency, will be warm
It mends crystal oscillator and is arranged far from the position of pyrotoxin, and take the measure for reducing heat transmitting, temperature compensation can be made in this way
The temperature change of crystal oscillator is unlikely to excessively acutely；In addition microminiature compensation crystal oscillator is selected, compensation crystal is reduced
The temperature gradient of oscillator therein can make compensation crystal oscillator permanent in constant-temperature crystal oscillator start process in this way
Its frequency temperature stability is kept in full warm area in the case where the variation of warm area high temperature.
When analog switch is arranged, the analog switch of high switching rate, low-power consumption, low on-resistance is selected.Switching logic
Control input voltage is generated by temperature sensing circuit.The comparator that temperature sensing circuit is made of thermistor and operational amplifier
Composition, the working principle of the circuit are, when thermistor measures flat-temperature zone temperature higher than a certain setting value, circuit output voltage
It is become zero by high level (+5V).The desired temperature is close but slightly below constant temperature point temperature.
Constant-temperature crystal oscillator is the very high device of frequency accuracy, and master-oscillator and compensation crystal oscillator are respectively set solely
Vertical isolation buffer grade is linked into amplification output stage, can reduce the mutual shadow between master-oscillator and compensation crystal oscillator as far as possible
It rings, and guarantees after constant-temperature crystal oscillator steady operation, compensation crystal oscillator circuit branch influences it close to zero.
In the present invention, constant-temperature crystal oscillator master-oscillator uses general Pierre's Si parallel oscillatory circuit；Heated for controlling temperature
Circuit uses proportional integration temperature-adjusting circuit.
On the other hand, based on the above-mentioned technical proposal, the present invention also provides a kind of temperature sensing circuits, as shown in figure 3, packet
It includes:
RT2 is thermistor；Rset is desired temperature resistance；N1 is operational amplifier；It Rf, is feedback resistance；R is
Fixed resistance.
Constant-temperature crystal oscillator power-up starting, since thermistor RT2 resistance value is larger, greater than desired temperature resistance
Rset, temperature sensing circuit output+5V high level；
The incoming level of analog switch logic control at this time is high level, and switch S1 opens S2 closure, constant-temperature crystal oscillator
Master-oscillator does not work, and compensation crystal oscillator work exports as compensation crystal oscillator frequency；
After being powered on work, when flat-temperature zone, temperature surmounts setting value, and thermistor RT2 resistance value is less than desired temperature resistance
Rset, temperature sensing circuit output voltage become zero；
The incoming level of analog switch logic control at this time becomes low level, and switch S1 is closed S2 and opens, compensation crystal oscillation
Device does not work, and the work of constant-temperature crystal oscillator master-oscillator exports as constant-temperature crystal oscillator frequency.
Those skilled in the art of the present technique are appreciated that unless expressly stated, singular " one " used herein, " one
It is a ", " described " and "the" may also comprise plural form.It is to be further understood that being arranged used in specification of the invention
Diction " comprising " refer to that there are the feature, integer, step, operation, element and/or component, but it is not excluded that in the presence of or addition
Other one or more features, integer, step, operation, element, component and/or their group.It should be understood that when we claim member
Part is " connected " or when " coupled " to another element, it can be directly connected or coupled to other elements, or there may also be
Intermediary element.In addition, " connection " used herein or " coupling " may include being wirelessly connected or wirelessly coupling.It is used herein to arrange
Diction "and/or" includes one or more associated wholes for listing item or any cell and all combinations.
Those skilled in the art of the present technique are appreciated that unless otherwise defined, all terms used herein (including technology art
Language and scientific term), there is meaning identical with the general understanding of those of ordinary skill in fields of the present invention.Should also
Understand, those terms such as defined in the general dictionary, it should be understood that have in the context of the prior art
The consistent meaning of meaning, and unless idealization or meaning too formal otherwise will not be used by specific definitions as here
To explain.
It should be appreciated that being above schematical by the detailed description that preferred embodiment carries out technical solution of the present invention
And not restrictive.Those skilled in the art can remember each embodiment on the basis of reading description of the invention
The technical solution of load is modified or equivalent replacement of some of the technical features；And these are modified or replaceed, and
Depart from the spirit and scope of the technical scheme of various embodiments of the present invention the essence of corresponding technical solution.
Claims (9)
1. a kind of constant-temperature crystal oscillator characterized by comprising
Analog switch is separately connected with the master-oscillator and compensation crystal oscillator of constant-temperature crystal oscillator, also electric with temperature sensing
Road connection；Voltage regulator circuit (1), connect with temperature-adjusting circuit and the temperature sensing circuit respectively；The constant-temperature crystal oscillator
Master-oscillator is connect with isolation buffer grade (1)；The compensation crystal oscillator is connect with isolation buffer grade (2), amplification output stage with
The isolation buffer grade (1) and the isolation buffer grade (2) are separately connected.
2. constant-temperature crystal oscillator as described in claim 1, which is characterized in that further include:
Voltage regulator circuit (2), connect with power supply and the analog switch respectively.
3. constant-temperature crystal oscillator as described in claim 1, which is characterized in that
The analog switch, for controlling the main vibration of the constant-temperature crystal oscillator when constant-temperature crystal oscillator is powered on and starts
Grade does not work；The compensation crystal oscillator work.
4. constant-temperature crystal oscillator as described in claim 1, which is characterized in that the analog switch is also used in the temperature
When degree sensing circuit detects constant-temperature crystal oscillator flat-temperature zone temperature and reaches constant temperature point, the compensation crystal oscillation is controlled
Device does not work, and the master-oscillator of the constant-temperature crystal oscillator works normally.
5. constant-temperature crystal oscillator as described in claim 1, which is characterized in that the temperature-adjusting circuit uses proportional integration temperature control
Circuit.
6. constant-temperature crystal oscillator as described in claim 1, which is characterized in that the constant-temperature crystal oscillator master-oscillator uses
Pierre's Si parallel oscillatory circuit.
7. constant-temperature crystal oscillator as described in claim 1, which is characterized in that the frequency of the compensation crystal oscillator and institute
The frequency for stating constant-temperature crystal oscillator master-oscillator is identical.
8. a kind of temperature sensing circuit equipped with such as described in any item constant-temperature crystal oscillators of claim 1-7.
9. a kind of working method of such as described in any item constant-temperature crystal oscillators of claim 1-7 characterized by comprising
In the case of being powered on starting, by controlling analog switch, the master-oscillator for controlling constant-temperature crystal oscillator does not work, temperature compensation
Crystal oscillator work, the output frequency for controlling compensation crystal oscillator are input to by corresponding isolation buffer grade circuit
The amplification output stage of constant-temperature crystal oscillator, and export；
In the case where use temperature sensing circuit detects flat-temperature zone temperature and reaches constant temperature point, analog switch is controlled, so that warm
It mends crystal oscillator not work, master-oscillator institute's making alive of constant-temperature crystal oscillator is its operating voltage, constant-temperature crystal oscillator
The output frequency of master-oscillator is input to the amplification output stage of constant-temperature crystal oscillator by corresponding isolation buffer grade circuit,
And it exports.
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| CN201811594185.8A CN109347443A (en) | 2018-12-25 | 2018-12-25 | A kind of constant-temperature crystal oscillator and its working method |
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| CN201811594185.8A CN109347443A (en) | 2018-12-25 | 2018-12-25 | A kind of constant-temperature crystal oscillator and its working method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112422123A (en) * | 2020-11-24 | 2021-02-26 | 武汉滨湖电子有限责任公司 | Low-phase noise frequency synthesizer and local oscillator implementation method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59194519A (en) * | 1983-04-19 | 1984-11-05 | Toyo Commun Equip Co Ltd | Method for generating reference frequency |
| JPH11136036A (en) * | 1997-10-27 | 1999-05-21 | Nec Corp | Crystal vibrator switching thermostatic oven type crystal oscillator and its oscillation output method |
| CN105911953A (en) * | 2016-06-23 | 2016-08-31 | 李玉盛 | Novel control system for intelligent home |
-
2018
- 2018-12-25 CN CN201811594185.8A patent/CN109347443A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59194519A (en) * | 1983-04-19 | 1984-11-05 | Toyo Commun Equip Co Ltd | Method for generating reference frequency |
| JPH11136036A (en) * | 1997-10-27 | 1999-05-21 | Nec Corp | Crystal vibrator switching thermostatic oven type crystal oscillator and its oscillation output method |
| CN105911953A (en) * | 2016-06-23 | 2016-08-31 | 李玉盛 | Novel control system for intelligent home |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112422123A (en) * | 2020-11-24 | 2021-02-26 | 武汉滨湖电子有限责任公司 | Low-phase noise frequency synthesizer and local oscillator implementation method |
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Application publication date: 20190215 |