CN110380687B - Multifunctional automatic correction and compensation machine for temperature frequency drift of crystal oscillator - Google Patents
Multifunctional automatic correction and compensation machine for temperature frequency drift of crystal oscillator Download PDFInfo
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- CN110380687B CN110380687B CN201910784344.9A CN201910784344A CN110380687B CN 110380687 B CN110380687 B CN 110380687B CN 201910784344 A CN201910784344 A CN 201910784344A CN 110380687 B CN110380687 B CN 110380687B
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- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
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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
- H03B5/02—Details
- H03B5/04—Modifications of generator to compensate for variations in physical values, e.g. power supply, load, temperature
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Abstract
The invention discloses a multifunctional crystal oscillator temperature frequency drift automatic correction and compensation machine, which relates to the field of electronic circuits, and adds a corresponding peripheral control circuit for a temperature compensation crystal oscillator.
Description
Technical Field
The invention relates to the field of electronic circuits, in particular to an automatic temperature frequency drift correction and compensation machine of a multifunctional crystal oscillator.
Background
TCXOs (Temperature Compenstate Xtal Oscillator, temperature compensated crystal oscillators) are quartz oscillators that reduce the amount of change in oscillation frequency due to ambient temperature changes by means of additional temperature compensation circuits, but the compensation accuracy achievable by TCXOs is difficult to meet industrial needs.
Disclosure of Invention
Aiming at the problems and the technical requirements, the invention provides a multifunctional automatic correction and compensation machine for the temperature frequency drift of a crystal oscillator, which has the following technical scheme:
The multifunctional automatic temperature frequency drift correction and compensation machine for the crystal oscillator comprises a temperature compensation crystal oscillator, wherein a VDD pin of the temperature compensation crystal oscillator is connected with a positive electrode of a power supply, and the VDD pin is grounded through a filter capacitor; the control signal source is connected with the input end of the tri-state buffer, the output end of the tri-state buffer is connected with the SCLK pin of the temperature compensation crystal oscillator, and the serial clock high-resistance state control end is connected with the enabling end of the tri-state buffer through the first reverser; the digital signal input end is connected with one movable end of a first single-pole double-throw switch through a second reverser, the other movable end of the first single-pole double-throw switch is connected with the signal output end, the fixed end of the first single-pole double-throw switch is connected with one movable end of a second single-pole double-throw switch, the other movable end of the second single-pole double-throw switch is connected with the fixed end of a third single-pole double-throw switch, and the fixed end of the second single-pole double-throw switch is connected with a CSOUT pin of a temperature compensation crystal oscillator; one movable end of the third single-pole double-throw switch is suspended, and the other movable end of the third single-pole double-throw switch is connected with the first digital multimeter; the signal closing control end is connected with the control end of the first single-pole double-throw switch and the control end of the third single-pole double-throw switch through a third reverser; the signal starting control end is connected with the control end of the second single-pole double-throw switch through a fourth reverser; the signal input high-resistance state control end is connected with the control end of a fourth single-pole double-throw switch through a fifth reverser, one movable end of the fourth single-pole double-throw switch is suspended, the other movable end of the fourth single-pole double-throw switch is connected with the output end of the tri-state buffer, and the fixed end of the fourth single-pole double-throw switch is connected with a second digital multimeter; the CSOUT pin of the temperature compensation crystal oscillator is grounded through a first capacitor and a first resistor respectively, and is connected with a second capacitor and an amplifier in sequence and then connected with a frequency counter.
The multifunctional automatic temperature frequency drift correction and compensation machine for the crystal oscillators comprises at least two temperature compensation crystal oscillators, wherein the positive electrode of a power supply is respectively connected with the VDD pin of each temperature compensation crystal oscillator through a multi-way switch; the output end of the tri-state buffer is respectively connected with the SCLK pin of each temperature compensation crystal oscillator through a multi-way switch; the fixed end of the second single-pole double-throw switch is respectively connected with the CSOUT pin of each temperature compensation crystal oscillator through a multi-way switch.
The multifunctional automatic temperature frequency drift correction and compensation machine comprises 1024 temperature compensation crystal oscillators, wherein the positive electrode of a power supply is connected with the public end of a first multi-way switch, each channel of the first multi-way switch is respectively connected with the public end of a second multi-way switch, and each channel of each second multi-way switch is respectively connected with the VDD pin of one temperature compensation crystal oscillator; the output end of the tri-state buffer is connected with the common end of the third multi-way switch, each channel of the third multi-way switch is respectively connected with the common end of a fourth multi-way switch, and each channel of each fourth multi-way switch is respectively connected with the SCLK pin of a temperature compensation crystal oscillator; the fixed end of the second single-pole double-throw switch is connected with the common end of the fifth multi-way switch, each channel of the fifth multi-way switch is respectively connected with the common end of a sixth multi-way switch, and each channel of each sixth multi-way switch is respectively connected with a CSOUT pin of a temperature compensation crystal oscillator; the first multi-way switch, the second multi-way switch, the third multi-way switch, the fourth multi-way switch, the fifth multi-way switch and the sixth multi-way switch are all multi-way switches with 32 channels.
The further technical scheme is that the first multi-way switch, the second multi-way switch, the third multi-way switch, the fourth multi-way switch, the fifth multi-way switch and the sixth multi-way switch are respectively realized by an ADG732 chip.
The further technical scheme is that the first single-pole double-throw switch, the second single-pole double-throw switch, the third single-pole double-throw switch and the fourth single-pole double-throw switch are respectively realized by an ADG849 chip or a MAX4729 chip.
The further technical scheme is that the first inverter, the second inverter, the third inverter, the fourth inverter and the fifth inverter are respectively realized by five channels in a CD74HC04 chip.
The further technical scheme is that the tri-state buffer is realized by a CD74HC125 chip.
The beneficial technical effects of the invention are as follows:
The application discloses a multifunctional automatic correction and compensation machine for temperature frequency drift of a crystal oscillator, which is characterized in that a corresponding peripheral control circuit is added for the temperature compensation crystal oscillator, different states can be generated by combining a tri-state buffer, an inverter and a single-pole double-throw switch which are connected with the temperature compensation crystal oscillator and each control terminal, and the temperature compensation crystal oscillator is compensated by matching with temperature change, so that the original temperature curve of the temperature compensation crystal oscillator can be leveled, high-precision frequency is achieved, and industrial use requirements are met. In addition, the application can realize the compensation of up to 1024 temperature compensation crystal oscillators at one time by adding the multiple switches in the circuit structure, and the efficiency is higher.
Drawings
FIG. 1 is a circuit diagram of an automatic correction and compensation machine for temperature drift of a multifunctional crystal oscillator according to the present disclosure.
Detailed Description
The following describes the embodiments of the present invention further with reference to the drawings.
Referring to fig. 1, the multifunctional crystal oscillator temperature frequency drift automatic correction and compensation machine comprises a temperature compensation crystal oscillator T1, a VDD pin of the temperature compensation crystal oscillator T1 is connected with the positive electrode of a power supply D, the negative electrode of the power supply D is grounded, and the VDD pin is also grounded through a filter capacitor C0. The control signal source DO15 is connected with the input end of the tri-state buffer, the output end of the tri-state buffer is connected with the SCLK pin of the temperature compensation crystal oscillator T1, and the serial clock high-resistance state control end DO10 is connected with the enabling end of the tri-state buffer through the first reverser. In the application, a tri-state buffer is realized by a buffer chip, the application adopts a CD74HC125 chip, the chip comprises 4 channels, each channel is provided with three pins to form a tri-state buffer, when the tri-state buffer is in particular realized, a control signal source DO15 is connected with an input end 1A pin of one channel of the CD74HC125 chip U1, an output end 1Y pin of the channel is connected with an SCLK pin of a temperature compensation crystal oscillator T1, and a serial clock high-resistance state control end DO10 is connected with the channel through a first reverserPins. In the application, the reverser is realized by a reverser chip, the application adopts a CD74HC04 chip which has 6 channels, and each channel is provided with two pins to form the reverser, when the reverser is specifically realized, the serial clock high-resistance state control terminal DO10 is connected with the pin 1A of the input end of one channel of the CD74HC04 chip U2, and the output end/>Pin connection CD74HC125 chip U1/>Pins.
The digital signal input DO11 is connected with one active end NC of the first single-pole double-throw switch U3 through a second reverser, the other active end NO of the first single-pole double-throw switch U3 is connected with the signal output end DI0, in the application, the second reverser is realized by another channel of the CD74HC04 chip U2, DO11 is connected with the 2A pin of the CD74HC04 chip U2, and the output end of the corresponding channelThe pin is connected with a movable end NC of the first single-pole double-throw switch U3, and each single-pole double-throw switch in the application is realized by a switch chip, such as an ADG849 chip or a MAX4729 chip.
The fixed end COM of the first single-pole double-throw switch U3 is connected with one movable end NO of the second single-pole double-throw switch U4, and the other movable end NC of the second single-pole double-throw switch U4 is connected with the fixed end COM of the third single-pole double-throw switch U5. The fixed end COM of the second single-pole double-throw switch U4 is connected with the CSOUT pin of the temperature compensation crystal oscillator T1. One movable end NC of the third single-pole double-throw switch U5 is suspended, the other movable end NO is connected with the first digital multimeter M1, and the other end of the first digital multimeter M1 is grounded.
The signal closing control terminal DO13 is connected with the control terminal IN of the first single-pole double-throw switch U3 and the control terminal IN of the third single-pole double-throw switch U5 through a third inverter, and likewise, the third inverter is realized by another channel of the CD74HC04 chip U2, then DO13 is connected with the 4A pin of the CD74HC04 chip U2, and the output terminal of the channelThe pins connect the IN pins of U3 and U5.
The signal on control terminal DO14 is connected with the control terminal IN of the second single-pole double-throw switch U4 through a fourth inverter, and similarly, the fourth inverter is realized by another channel of the CD74HC04 chip U2, then DO14 is connected with the 5A pin of the CD74HC04 chip U2, and the output terminal of the channelThe pin is connected with the IN pin of U4.
The signal input high-resistance state control terminal DO12 is connected with the control terminal IN of the fourth single-pole double-throw switch U6 through a fifth inverter, and similarly, the fifth inverter is realized by another channel of the CD74HC04 chip U2, then DO12 is connected with the 3A pin of the CD74HC04 chip U2, and the output terminal of the channelThe pin is connected with the IN pin of U6. One movable end NC of the fourth single-pole double-throw switch U6 is suspended, and the other movable end NO is connected with the output end of the tri-state buffer, namely connected with the 1Y pin of the CD74HC125 chip U1. The fixed end COM of the fourth single-pole double-throw switch U6 is connected with the second digital multimeter M2, and the other end of the second digital multimeter M2 is grounded.
The CSOUT pin of the temperature compensation crystal oscillator T1 is also grounded through a first capacitor C1 and a first resistor R1 respectively, the CSOUT pin of the temperature compensation crystal oscillator T1 is also connected with a second capacitor C2 and an amplifier in sequence and then is connected with a frequency counter M3, the other end of the frequency counter M3 is grounded, in the application, three amplifiers D1, D2 and D3 are connected between the second capacitor and the frequency counter M3, and the three amplifiers D1, D2 and D3 provide 66dB amplification effect in total.
According to the circuit mechanism provided by the application, different states can be generated through the U1, the U2 and each single-pole double-throw switch, the temperature compensation crystal oscillator T1 is compensated by matching with temperature change, the original temperature curve of the temperature compensation crystal oscillator T1 is leveled by modifying the memory read value of the temperature compensation crystal oscillator T1 under the conditions of temperature and frequency, so that high-precision frequency can be achieved, and the temperature can reach-40-85 ℃ plus or minus 1ppm through actual measurement.
In addition, the application also adds a multi-way switch for the circuit structure, so that the compensation of a plurality of temperature compensation crystal oscillators T1 can be realized at one time, and the positive pole of the power supply D is respectively connected with the VDD pin of each temperature compensation crystal oscillator T1 through the multi-way switch. The output end of the tri-state buffer is respectively connected with the SCLK pin of each temperature compensation crystal oscillator T1 through a multi-way switch, namely in the application, the 1Y pin of U1 is respectively connected with the SCLK pin of each temperature compensation crystal oscillator T1 through a multi-way switch. The fixed end COM of the second single-pole double-throw switch U4 is respectively connected with the CSOUT pin of each temperature compensation crystal oscillator through a multi-way switch. The application adopts a 32-channel multi-way switch, thereby realizing the compensation of 1024 temperature compensation crystal oscillators T1 at one time, and adopting the structure as follows:
The positive pole of the power supply D is connected with the public end D of the first multi-way switch K1, each channel of the first multi-way switch K1 is respectively connected with the public end D of a second multi-way switch K2, and each channel of each second multi-way switch K2 is respectively connected with the VDD pin of a temperature compensation crystal oscillator T1. As shown in fig. 1, one channel S1 of the first multi-way switch K1 is connected to the common terminal D of the second multi-way switch K2, the other channels S2-S32 of the first multi-way switch K1 are also connected to the common terminal D of the other second multi-way switches K2, one channel S1 of the second multi-way switch K2 is connected to the VDD pin of one temperature compensation crystal oscillator T1, and the other channels S2-S32 of the second multi-way switch K2 are also connected to the VDD pin of the other temperature compensation crystal oscillators.
The output end of the tri-state buffer is connected with the public end D of the third multi-way switch K3, each channel of the third multi-way switch K3 is respectively connected with the public end D of a fourth multi-way switch K4, and each channel of each fourth multi-way switch K4 is respectively connected with the SCLK pin of a temperature compensation crystal oscillator T1. That is, pin 1Y of U1 is connected to the common terminal D of the third multi-way switch K3, one channel S1 of the third multi-way switch K3 is connected to the common terminal D of the fourth multi-way switch K4 as shown in fig. 1, the other channels S2-S32 are also connected to the common terminals D of the other fourth multi-way switches K4, one channel S1 of the fourth multi-way switch K4 is connected to the SCLK pin of one temperature compensation crystal oscillator T1 as shown in fig. 1, and the other channels S2-S32 are also connected to the SCLK pins of the other temperature compensation crystal oscillators.
The fixed end COM of the second single-pole double-throw switch U4 is connected with the public end D of the fifth multi-way switch K5, each channel of the fifth multi-way switch K5 is respectively connected with the public end D of a sixth multi-way switch K6, and each channel of each sixth multi-way switch K6 is respectively connected with a CSOUT pin of a temperature compensation crystal oscillator T1. That is, the COM pin of the second single pole double throw switch U4 is connected to the common terminal D of the fifth multiple way switch K5, one channel S1 of the fifth multiple way switch K5 is connected to the common terminal D of the sixth multiple way switch K6 as shown in fig. 1, the other channels S2-S32 are also connected to the common terminals D of the other sixth multiple way switches K6, one channel S1 of the sixth multiple way switch K6 is connected to the CSOUT pin of one temperature compensated crystal oscillator T1 as shown in fig. 1, and the other channels S2-S32 are also connected to the CSOUT pins of the other temperature compensated crystal oscillators.
In addition, the CSOUT pin of each temperature compensated crystal oscillator is not directly connected to the amplifier after being connected to the second capacitor C2, but is connected to one channel of the 32-channel sixth multi-channel switch K6 by the second capacitor C2, and the common terminal D of the sixth multi-channel switch K6 is connected to the amplifier and then connected to the frequency counter M3.
The multi-way switches K1-K6 are all 32-channel multi-way switches, and the application is realized by adopting an ADG732 chip. According to the application, 1024 temperature compensation crystal oscillators can be compensated at one time under the action of the multi-way switch, so that the efficiency is higher. In actual implementation, the present application includes, in addition to the circuit configuration shown in fig. 1, further necessary peripheral circuits, and these peripheral circuits are not illustrated in detail.
The above is only a preferred embodiment of the present application, and the present application is not limited to the above examples. It is to be understood that other modifications and variations which may be directly derived or contemplated by those skilled in the art without departing from the spirit and concepts of the present application are deemed to be included within the scope of the present application.
Claims (5)
1. The multifunctional automatic temperature frequency drift correction and compensation machine for the crystal oscillator is characterized by comprising a temperature compensation crystal oscillator, wherein a VDD pin of the temperature compensation crystal oscillator is connected with a positive electrode of a power supply, and the VDD pin is grounded through a filter capacitor; the control signal source is connected with the input end of the tri-state buffer, the output end of the tri-state buffer is connected with the SCLK pin of the temperature compensation crystal oscillator, and the serial clock high-resistance state control end is connected with the enabling end of the tri-state buffer through the first reverser; the digital signal input end is connected with one movable end of a first single-pole double-throw switch through a second reverser, the other movable end of the first single-pole double-throw switch is connected with the signal output end, the fixed end of the first single-pole double-throw switch is connected with one movable end of a second single-pole double-throw switch, the other movable end of the second single-pole double-throw switch is connected with the fixed end of a third single-pole double-throw switch, and the fixed end of the second single-pole double-throw switch is connected with a CSOUT pin of the temperature compensation crystal oscillator; one movable end of the third single-pole double-throw switch is suspended, and the other movable end of the third single-pole double-throw switch is connected with a first digital multimeter; the signal closing control end is connected with the control end of the first single-pole double-throw switch and the control end of the third single-pole double-throw switch through a third reverser; the signal starting control end is connected with the control end of the second single-pole double-throw switch through a fourth reverser; the signal input high-resistance state control end is connected with the control end of a fourth single-pole double-throw switch through a fifth reverser, one movable end of the fourth single-pole double-throw switch is suspended, the other movable end of the fourth single-pole double-throw switch is connected with the output end of the tri-state buffer, and the fixed end of the fourth single-pole double-throw switch is connected with a second digital multimeter; the CSOUT pin of the temperature compensation crystal oscillator is grounded through a first capacitor and a first resistor respectively, and is connected with a second capacitor and an amplifier in sequence and then connected with a frequency counter; the first single-pole double-throw switch, the second single-pole double-throw switch, the third single-pole double-throw switch and the fourth single-pole double-throw switch are respectively realized by an ADG849 chip or a MAX4729 chip; the first inverter, the second inverter, the third inverter, the fourth inverter and the fifth inverter are respectively realized by five channels in a CD74HC04 chip.
2. The automatic temperature drift correction and compensation machine for the multifunctional crystal oscillator according to claim 1, wherein the automatic temperature drift correction and compensation machine for the multifunctional crystal oscillator comprises at least two temperature compensation crystal oscillators, and the positive electrode of the power supply is respectively connected with the VDD pin of each temperature compensation crystal oscillator through a multi-way switch; the output end of the tri-state buffer is respectively connected with the SCLK pin of each temperature compensation crystal oscillator through a multi-way switch; and the fixed end of the second single-pole double-throw switch is respectively connected with the CSOUT pin of each temperature compensation crystal oscillator through a multi-way switch.
3. The automatic correction and compensation machine for temperature drift of a multifunctional crystal oscillator according to claim 2, wherein the automatic correction and compensation machine for temperature drift of the multifunctional crystal oscillator comprises 1024 temperature compensation crystal oscillators, the positive electrode of the power supply is connected with the common end of a first multi-way switch, each channel of the first multi-way switch is respectively connected with the common end of a second multi-way switch, and each channel of each second multi-way switch is respectively connected with the VDD pin of one temperature compensation crystal oscillator; the output end of the tri-state buffer is connected with the common end of a third multi-way switch, each channel of the third multi-way switch is respectively connected with the common end of a fourth multi-way switch, and each channel of each fourth multi-way switch is respectively connected with the SCLK pin of a temperature compensation crystal oscillator; the fixed end of the second single-pole double-throw switch is connected with the common end of a fifth multi-way switch, each channel of the fifth multi-way switch is respectively connected with the common end of a sixth multi-way switch, and each channel of each sixth multi-way switch is respectively connected with a CSOUT pin of a temperature compensation crystal oscillator; the first multi-way switch, the second multi-way switch, the third multi-way switch, the fourth multi-way switch, the fifth multi-way switch and the sixth multi-way switch are all multi-way switches with 32 channels.
4. The machine of claim 3, wherein the first, second, third, fourth, fifth and sixth multi-way switches are implemented by ADG732 chips, respectively.
5. The apparatus of any one of claims 1-4, wherein the tri-state buffer is implemented by a CD74HC125 chip.
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| CN201910784344.9A CN110380687B (en) | 2019-08-23 | 2019-08-23 | Multifunctional automatic correction and compensation machine for temperature frequency drift of crystal oscillator |
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| CN201910784344.9A CN110380687B (en) | 2019-08-23 | 2019-08-23 | Multifunctional automatic correction and compensation machine for temperature frequency drift of crystal oscillator |
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| CN110380687B true CN110380687B (en) | 2024-06-18 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1201568A (en) * | 1995-11-09 | 1998-12-09 | 池田毅 | Tuning control manner |
| CN1909362A (en) * | 2005-08-01 | 2007-02-07 | 爱普生拓优科梦株式会社 | Crystal oscillator |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11220327A (en) * | 1997-10-31 | 1999-08-10 | Dynamics Corp Of America | Temperature compensation circuit for oscillator |
| KR20010009709A (en) * | 1999-07-13 | 2001-02-05 | 이형도 | Temperature compensated crystal oscillator |
| CN2650392Y (en) * | 2003-10-16 | 2004-10-20 | 张连琴 | Full-digital temperature-compensating chip oscillator monolithic integrated block |
| JP2009094853A (en) * | 2007-10-10 | 2009-04-30 | Epson Toyocom Corp | Temperature compensation type piezoelectric oscillator |
-
2019
- 2019-08-23 CN CN201910784344.9A patent/CN110380687B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1201568A (en) * | 1995-11-09 | 1998-12-09 | 池田毅 | Tuning control manner |
| CN1909362A (en) * | 2005-08-01 | 2007-02-07 | 爱普生拓优科梦株式会社 | Crystal oscillator |
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