CN117375574A - Frequency compensation standard source and frequency component testing system - Google Patents
Frequency compensation standard source and frequency component testing system Download PDFInfo
- Publication number
- CN117375574A CN117375574A CN202311675087.8A CN202311675087A CN117375574A CN 117375574 A CN117375574 A CN 117375574A CN 202311675087 A CN202311675087 A CN 202311675087A CN 117375574 A CN117375574 A CN 117375574A
- Authority
- CN
- China
- Prior art keywords
- capacitor
- frequency
- crystal oscillator
- standard source
- compensation standard
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000012360 testing method Methods 0.000 title claims abstract description 31
- 239000013078 crystal Substances 0.000 claims abstract description 47
- 238000001914 filtration Methods 0.000 claims abstract description 18
- 230000001105 regulatory effect Effects 0.000 claims abstract description 17
- 239000003990 capacitor Substances 0.000 claims description 54
- 239000010453 quartz Substances 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000032683 aging Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- RVCKCEDKBVEEHL-UHFFFAOYSA-N 2,3,4,5,6-pentachlorobenzyl alcohol Chemical compound OCC1=C(Cl)C(Cl)=C(Cl)C(Cl)=C1Cl RVCKCEDKBVEEHL-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H11/00—Networks using active elements
- H03H11/02—Multiple-port networks
- H03H11/28—Impedance matching networks
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/28—Provision in measuring instruments for reference values, e.g. standard voltage, standard waveform
-
- 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
- H03B5/02—Details
- H03B5/04—Modifications of generator to compensate for variations in physical values, e.g. power supply, load, temperature
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H11/00—Networks using active elements
- H03H11/54—Modifications of networks to reduce influence of variations of temperature
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Oscillators With Electromechanical Resonators (AREA)
Abstract
The invention is suitable for the technical field of frequency component testing, and provides a frequency compensation standard source and a frequency component testing system, wherein the frequency compensation standard source comprises: the filtering voltage-regulating module, the crystal oscillator module and the power divider are connected in sequence; the filtering voltage regulating module is used for filtering and regulating voltage of an externally input power supply signal and sending the power supply signal to the crystal oscillator module; the crystal oscillator module is used for generating a frequency signal according to the filtered and voltage-regulated power supply signal; the power divider is used for dividing the frequency signal into multiple paths and outputting the multiple paths. The invention can improve the precision of the frequency compensation standard source and reduce the use cost of the frequency compensation standard source.
Description
Technical Field
The invention belongs to the technical field of frequency component testing, and particularly relates to a frequency compensation standard source and a frequency component testing system.
Background
The frequency compensation standard source is used for compensating the signal frequency of the test equipment or instrument of the frequency component, and the quality of the signal frequency directly influences the performance of the test equipment or instrument.
The frequency compensation standard source for the production of the existing crystal industry is a single one-to-one voltage-controlled temperature compensation oscillator unit carried by test equipment, and the precision is +/-0.5 ppm. Aiming at the use requirement of the high-precision active crystal, the precision is insufficient at present, and the frequency difference is overlarge after aging, so that the requirement of high-end application parameters cannot be met. In addition, the standard source unit price for frequency compensation is very high, and if one-to-many use is not possible, the cost is too high.
Disclosure of Invention
In view of the above, the embodiment of the invention provides a frequency compensation standard source to solve the problem of high use cost of the frequency compensation standard source in the prior art.
A first aspect of an embodiment of the present invention provides a frequency compensation standard source, including: the filtering voltage-regulating module, the crystal oscillator module and the power divider are connected in sequence;
the filtering voltage regulating module is used for filtering and regulating voltage of an externally input power supply signal and sending the power supply signal to the crystal oscillator module;
the crystal oscillator module is used for generating a frequency signal according to the filtered and voltage-regulated power supply signal;
the power divider is used for dividing the frequency signal into multiple paths and outputting the multiple paths.
With reference to the first aspect, in a possible implementation manner of the first aspect, the filtering voltage regulating module includes: the first capacitor, the second capacitor, the third capacitor and the adjustable resistor;
the external power supply is respectively connected with the first end of the first capacitor, the first end of the second capacitor, the first fixed connection end of the adjustable resistor and the power input pin of the crystal oscillator module;
the sliding connection end of the adjustable resistor is respectively connected with the first end of the third capacitor and the control voltage input pin of the crystal oscillator module;
the second end of the first capacitor, the second end of the second capacitor, the second end of the third capacitor and the second fixed connection end of the adjustable resistor are all grounded.
With reference to the first aspect, in one possible implementation manner of the first aspect, the crystal oscillator module is connected to the power divider through a first impedance matching filter network.
With reference to the first aspect, in one possible implementation manner of the first aspect, the first impedance matching filter network includes: a fourth capacitance, a first inductance, and a fifth capacitance;
the signal output pin of the crystal oscillator module is respectively connected with the first end of the fourth capacitor and the first end of the first inductor;
the second end of the first inductor is respectively connected with the first end of the fifth capacitor and the signal input end of the power divider;
the second end of the fourth capacitor and the second end of the fifth capacitor are grounded.
With reference to the first aspect, in a possible implementation manner of the first aspect, each signal output terminal of the power divider is connected to the frequency signal output interface through a second impedance matching filter network.
With reference to the first aspect, in a possible implementation manner of the first aspect, the second impedance matching filter network includes: a sixth capacitance, a second inductance, and a seventh capacitance;
each signal output end of the power divider is respectively connected with the first end of the sixth capacitor and the first end of the second inductor;
the second end of the first inductor is respectively connected with the first end of the seventh capacitor and the frequency signal output interface;
the second end of the sixth capacitor and the second end of the seventh capacitor are grounded.
With reference to the first aspect, in one possible implementation manner of the first aspect, the crystal oscillator module is a constant temperature crystal oscillator that uses SC cut quartz crystals.
A second aspect of the embodiments of the present invention provides a frequency component testing system, including at least one frequency component testing device, and a frequency compensation standard source as in the first aspect or any one of the possible implementation manners of the first aspect; the frequency compensation standard source is used for providing frequency signals for the frequency component testing equipment.
Compared with the prior art, the embodiment of the invention has the beneficial effects that:
in the embodiment of the invention, the filtering voltage regulating module can filter the power supply signal to ensure that the power supply signal is cleaner, and can accurately regulate the power supply voltage to achieve the effect of compensating the frequency; then, the power supply signal passes through the crystal oscillator module to generate a high-precision high-power frequency signal; finally, the frequency signals are output after being divided into multiple paths by using the power divider, so that the frequency signals can be provided for a plurality of test devices at the same time, the one-to-many use requirement is met, the cost is reduced, and the precision of the frequency signals is not affected.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a module structure of a frequency compensation standard source according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a second module structure of the frequency compensation standard source according to the embodiment of the present invention;
FIG. 3 is a schematic circuit diagram of a frequency compensation standard source according to an embodiment of the present invention;
fig. 4 is a schematic diagram of the overall structure of a frequency compensation standard source according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to illustrate the technical scheme of the invention, the following description is made by specific examples.
Testing of high frequency product components requires the use of complex test equipment or instruments such as Vector Network Analyzers (VNAs), wafer probing systems, high frequency probes, semi-rigid or flexible coaxial radio frequency cables, calibration substrates, and the like. In the conventional technology, the standard source of frequency compensation is a voltage-controlled temperature compensation oscillator unit of the test equipment, such as a constant temperature crystal oscillator (Oven Controlled Crystal Oscillator, OCXO), which is a quartz crystal oscillator arranged in an oven, and the temperature of the quartz crystal resonator is kept constant by using a constant temperature tank, so that the influence of ambient temperature change on the output frequency of the oscillator is reduced to the minimum.
The components of the constant temperature crystal oscillator comprise an inverting amplifier, a varactor, a temperature compensation chip, a wafer, a shielding shell, a contact pin base, a circuit board, a connecting wire and the like. The working principle is that a feedback oscillation network formed by an inverting amplifier is used for generating a signal, the signal is subjected to frequency selection through a wafer, then frequency precision compensation is carried out on the frequency signal through a temperature compensation chip and a voltage controller, and finally the signal required by test equipment is obtained.
The constant-temperature crystal oscillator is expensive and is used one by one, so that the use cost is high.
Therefore, the embodiment of the invention provides a frequency compensation standard source, which realizes one-to-many use of the constant-temperature crystal oscillator and achieves the aim of reducing the cost.
Referring to fig. 1, the frequency compensation standard source according to the embodiment of the present invention includes: the device comprises a filtering voltage regulating module 11, a crystal oscillator module 12 and a power divider 13 which are connected in sequence.
The filtering voltage regulating module 11 is connected to an external power source, and is capable of filtering and regulating voltage of an externally input power signal, and then transmitting the power signal to the crystal oscillator module 12. The power supply signal is filtered, so that the power supply signal is cleaner, and the voltage is regulated to realize the purpose of compensating the frequency.
The crystal oscillator module 12 mainly generates and outputs a high-precision high-power frequency signal according to the power supply signal. Illustratively, the crystal oscillator module 12 may employ a thermostatically controlled crystal oscillator that SC-cuts a quartz crystal. The constant temperature control crystal oscillator can accurately control the temperature, so that the standard frequency and the aging frequency difference reach a higher level, and the low noise amplifier is used for pulling the frequency to a high-power output state.
Finally, the power divider 13 is added to divide the frequency signal but the frequency accuracy is not affected, so that the frequency compensation standard source can output a high-accuracy frequency signal to be supplied to a plurality of test devices.
Therefore, in this embodiment, the filtering voltage-regulating module may filter the power signal to make the power signal cleaner, and may accurately regulate the power voltage to achieve the effect of compensating the frequency; then, the power supply signal passes through the crystal oscillator module to generate a high-precision high-power frequency signal; finally, the frequency signals are output after being divided into multiple paths by using the power divider, so that the frequency signals can be provided for a plurality of test devices at the same time, the one-to-many use requirement is met, the cost is reduced, and the precision of the frequency signals is not affected.
Fig. 2 and 3 are circuit configuration diagrams of a frequency compensation standard source according to an embodiment of the present invention. Referring to fig. 2 and 3, the frequency compensation standard source of this embodiment will be described.
As a possible implementation, in this embodiment, the filtering voltage regulating module 11 includes: the first capacitor C1, the second capacitor C2, the third capacitor C3 and the adjustable resistor R1.
The external power supply VCC is connected to the first end of the first capacitor C1, the first end of the second capacitor C2, the first fixed connection end of the adjustable resistor R1 and the power input pin VCC of the crystal oscillator module OXCO through a power line 16. The sliding connection end of the adjustable resistor R1 is connected with the first end of the third capacitor C3 and the control voltage input pin VCON of the crystal oscillator module OXCO. The second end of the first capacitor C1, the second end of the second capacitor C2, the second end of the third capacitor C3 and the second fixed connection end of the adjustable resistor R1 are all grounded.
In this embodiment, the OCXO is essentially a small electronic system, and involves complex system technologies such as a crystal oscillating circuit, a power supply circuit, and a heat flow design. The control voltage input pin VCON is externally connected with voltage control voltage, and the output frequency can be changed by adjusting the voltage value through the adjustable resistor R1. This voltage must be low noise or it may affect the phase noise performance, so the power supply signal is filtered by constructing a power supply filter network with a plurality of capacitors C1, C2, C3, making the power supply signal cleaner.
As a possible implementation, in this embodiment, the crystal oscillator module 12 is connected to the power divider 13 via a first impedance matching filter network 14.
The high-power high-precision frequency signal passes through the first impedance matching filter network 14 to be subjected to filter matching, so that the frequency signal is more stable and cleaner.
Further, the first impedance matching filter network 14 includes: a fourth capacitor C4, a first inductance L1 and a fifth capacitor C5.
The signal output pin RF of the crystal oscillator module 12 is connected to the first end of the fourth capacitor C4 and the first end of the first inductor L1. The second end of the first inductor L1 is connected to the first end of the fifth capacitor C5 and the signal input end of the power divider 13. The second end of the fourth capacitor C4 and the second end of the fifth capacitor C5 are both grounded.
As a possible implementation, in this embodiment, each signal output of the power divider 13 is connected to the frequency signal output interface 17 through the second impedance matching filter network 15.
The second impedance matching filter network 15 is capable of filtering the frequency signal of each shunt, ensuring that the frequency signal of each shunt is sufficiently stable and clean. The stable clean reference frequency signal can then be output through the frequency signal output interface 17 (4 SMA joint) for use by a test device or instrument.
Further, the second impedance matching filter network 15 includes: a sixth capacitance C6, a second inductance L2 and a seventh capacitance C7.
Each signal output end of the power divider 13 is connected to the first end of the sixth capacitor C6 and the first end of the second inductor L2, respectively. The second end of the second inductor L2 is respectively connected with the first end of the seventh capacitor C7 and the frequency signal output interface 17; the second end of the sixth capacitor C6 and the second end of the seventh capacitor C7 are both grounded.
In one embodiment, the present invention also provides an overall structure schematic of the frequency compensation standard source, as shown in fig. 4.
In this embodiment, the circuit and the module of the above embodiment are integrated inside the housing 21, and the direct current power supply of 12v 5a is connected through the power line 16. The casing 21 is provided with a power indicator lamp 22 and a control switch 23. By pressing the control switch 23 to energize, the power indicator lamp 22 is turned on after the energization. 4-way frequency signals are output to each test device or instrument through 4 frequency signal output interfaces 17. It should be noted that the 4-way output of the present embodiment is merely an example, and specific setting of several ways of outputs may be adjusted according to actual demands.
The inventive point of the frequency compensation standard source of the present application is as follows:
(1) The high-end constant-temperature crystal and the control PCBA are used as a frequency reference main body, and a plurality of impedance matching filter networks are added to enable frequency signals to be more stable and clean, so that the problems of insufficient frequency precision and overlarge aging frequency difference of a compensation standard source of test equipment of the existing frequency components are solved.
Through the test:
the frequency accuracy is reduced from + -0.5 ppm to + -0.01 ppm.
The annual ageing precision is reduced from +/-1 ppm to +/-0.05 ppm.
(2) The single-channel signal is changed into multiple-channel signals by using the power divider, so that the multiple-channel signal can serve multiple test devices or instruments at the same time without interfering with each other.
Based on the frequency compensation standard source, the embodiment also provides a frequency component testing system, which comprises at least one frequency component testing device and the frequency compensation standard source. The frequency component testing system adopts one frequency compensation standard source to provide frequency signals for a plurality of different frequency component testing devices, and the use cost of the frequency compensation standard source is greatly reduced.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention.
Claims (7)
1. A frequency compensation standard source, comprising: the filtering voltage-regulating module, the crystal oscillator module and the power divider are connected in sequence;
the filtering voltage regulating module comprises a first capacitor, a second capacitor, a third capacitor and an adjustable resistor; the external power supply is respectively connected with the first end of the first capacitor, the first end of the second capacitor, the first fixed connection end of the adjustable resistor and the power input pin of the crystal oscillator module; the sliding connection end of the adjustable resistor is respectively connected with the first end of the third capacitor and the control voltage input pin of the crystal oscillator module; the second end of the first capacitor, the second end of the second capacitor, the second end of the third capacitor and the second fixed connection end of the adjustable resistor are all grounded; the filtering voltage regulating module is used for filtering and regulating voltage of an externally input power supply signal and sending the power supply signal to the crystal oscillator module;
the crystal oscillator module is used for generating a frequency signal according to the filtered and voltage-regulated power supply signal;
the power divider is used for dividing the frequency signal into multiple paths and outputting the multiple paths.
2. The frequency compensation standard source of claim 1, wherein the crystal oscillator module is connected to the power divider through a first impedance matching filter network.
3. The frequency compensation standard source of claim 2, wherein the first impedance matching filter network comprises: a fourth capacitance, a first inductance, and a fifth capacitance;
the signal output pin of the crystal oscillator module is respectively connected with the first end of the fourth capacitor and the first end of the first inductor;
the second end of the first inductor is respectively connected with the first end of the fifth capacitor and the signal input end of the power divider;
the second end of the fourth capacitor and the second end of the fifth capacitor are grounded.
4. The frequency compensation standard source of claim 1, wherein each signal output of the power divider is connected to a frequency signal output interface through a second impedance matching filter network.
5. The frequency compensation standard source of claim 4, wherein the second impedance matching filter network comprises: a sixth capacitance, a second inductance, and a seventh capacitance;
each signal output end of the power divider is respectively connected with the first end of the sixth capacitor and the first end of the second inductor;
the second end of the first inductor is respectively connected with the first end of the seventh capacitor and the frequency signal output interface;
the second end of the sixth capacitor and the second end of the seventh capacitor are grounded.
6. The frequency compensation standard source of any one of claims 1-5, wherein the crystal oscillator module is a constant temperature crystal oscillator employing SC-cut quartz crystals.
7. A frequency component testing system comprising at least one frequency component testing device, and a frequency compensation standard source according to any one of claims 1-6; the frequency compensation standard source is used for providing frequency signals for all frequency component testing equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311675087.8A CN117375574B (en) | 2023-12-08 | 2023-12-08 | Frequency compensation standard source and frequency component testing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311675087.8A CN117375574B (en) | 2023-12-08 | 2023-12-08 | Frequency compensation standard source and frequency component testing system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN117375574A true CN117375574A (en) | 2024-01-09 |
| CN117375574B CN117375574B (en) | 2024-02-20 |
Family
ID=89394869
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311675087.8A Active CN117375574B (en) | 2023-12-08 | 2023-12-08 | Frequency compensation standard source and frequency component testing system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117375574B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104467835A (en) * | 2014-10-28 | 2015-03-25 | 东南大学 | Frequency-agile and low-phase-noise frequency source |
| CN107248845A (en) * | 2017-05-17 | 2017-10-13 | 电子科技大学 | A kind of temperature compensating crystal oscillator based on digital circuit |
| CN107257239A (en) * | 2017-05-17 | 2017-10-17 | 电子科技大学 | A kind of temperature-compensating high frequency crystal oscillator based on analog compensation |
| CN110798148A (en) * | 2019-11-29 | 2020-02-14 | 电子科技大学 | Analog type anti-vibration crystal oscillator compensation device and method |
| US20230006683A1 (en) * | 2021-07-05 | 2023-01-05 | Shaoxing Yuanfang Semiconductor Co., Ltd. | Reduction of noise in output clock due to unequal successive time periods of a reference clock in a fractional-n phase locked loop |
| CN115912034A (en) * | 2022-10-28 | 2023-04-04 | 扬州海科电子科技有限公司 | Amplitude-phase-adjustable high-precision radio frequency excitation source |
-
2023
- 2023-12-08 CN CN202311675087.8A patent/CN117375574B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104467835A (en) * | 2014-10-28 | 2015-03-25 | 东南大学 | Frequency-agile and low-phase-noise frequency source |
| CN107248845A (en) * | 2017-05-17 | 2017-10-13 | 电子科技大学 | A kind of temperature compensating crystal oscillator based on digital circuit |
| CN107257239A (en) * | 2017-05-17 | 2017-10-17 | 电子科技大学 | A kind of temperature-compensating high frequency crystal oscillator based on analog compensation |
| CN110798148A (en) * | 2019-11-29 | 2020-02-14 | 电子科技大学 | Analog type anti-vibration crystal oscillator compensation device and method |
| US20230006683A1 (en) * | 2021-07-05 | 2023-01-05 | Shaoxing Yuanfang Semiconductor Co., Ltd. | Reduction of noise in output clock due to unequal successive time periods of a reference clock in a fractional-n phase locked loop |
| CN115912034A (en) * | 2022-10-28 | 2023-04-04 | 扬州海科电子科技有限公司 | Amplitude-phase-adjustable high-precision radio frequency excitation source |
Also Published As
| Publication number | Publication date |
|---|---|
| CN117375574B (en) | 2024-02-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7456699B2 (en) | Frequency controller for a monolithic clock generator and timing/frequency reference | |
| KR101126093B1 (en) | Monolithic clock generator and timing/frequency reference | |
| US7248124B2 (en) | Frequency calibration for a monolithic clock generator and timing/frequency reference | |
| US7504899B2 (en) | Inductor and capacitor-based clock generator and timing/frequency reference | |
| US11356105B2 (en) | Method for calibrating crystal frequency offset through internal loop of central processing unit | |
| KR20170052449A (en) | Device and method for adjusting duty cycle in clock signals | |
| US6794948B2 (en) | Oscillation circuit and electronics using the same | |
| CN105572429B (en) | Fixing device and monitoring system of crystal oscillator | |
| CN110971191B (en) | Push dielectric oscillator | |
| CN117375574B (en) | Frequency compensation standard source and frequency component testing system | |
| CN110798148A (en) | Analog type anti-vibration crystal oscillator compensation device and method | |
| CN107733369A (en) | Temperature compensating crystal oscillator | |
| CN107272394A (en) | A kind of integrated resonant time dissemination system calibration method of backup formula | |
| CN110855242A (en) | Voltage variation-based crystal oscillator vibration-resistant compensation device and method | |
| CN111147073A (en) | Novel microwave frequency locking device | |
| CN110868211B (en) | Crystal oscillator vibration-proof compensation device and method based on binary coding | |
| JP4561029B2 (en) | OSCILLATOR CIRCUIT AND ELECTRONIC DEVICE USING THE SAME | |
| JP2011250437A (en) | Filter calibration | |
| CN203377840U (en) | Different crystal load matching circuit in crystal oscillator and IC | |
| Montress et al. | Design and performance of a low noise, wide tuning range AQP SAW delay line VCO | |
| CN116598738B (en) | Four-port frequency-selecting network and microwave oscillator constructed by same | |
| CN114221654A (en) | Frequency generation device and method for inducing atoms to generate Raman transition | |
| CN116155238A (en) | Relaxation oscillator system | |
| CN117458996A (en) | Oscillating circuit | |
| CN117478128A (en) | Phase-locked frequency source output power control circuit, control method and circuit board |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |