CN109831161A - Crystal oscillating circuit - Google Patents
Crystal oscillating circuit Download PDFInfo
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- CN109831161A CN109831161A CN201910075220.3A CN201910075220A CN109831161A CN 109831161 A CN109831161 A CN 109831161A CN 201910075220 A CN201910075220 A CN 201910075220A CN 109831161 A CN109831161 A CN 109831161A
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- feedback resistance
- crystal
- oscillating circuit
- crystal oscillating
- control switch
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- 239000013078 crystal Substances 0.000 title claims abstract description 127
- 230000009514 concussion Effects 0.000 claims abstract description 37
- 239000003990 capacitor Substances 0.000 claims abstract description 8
- 238000001514 detection method Methods 0.000 claims description 9
- 230000005611 electricity Effects 0.000 description 9
- 230000010355 oscillation Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 230000010349 pulsation Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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- Oscillators With Electromechanical Resonators (AREA)
Abstract
The present invention provides a kind of crystal oscillating circuit, including concussion crystal, tunable capacitor, start-up resistor, switching group and Logic control module；Concussion crystal is used to form the resonant cavity of oscillating circuit；Tunable capacitor one end is connect with one end of concussion crystal, and the other end is connect with the other end of concussion crystal；Start-up resistor one end is connect with one end of concussion crystal, and the other end is connect by feedback resistance group with the other end for shaking crystal；Feedback resistance group includes the multiple feedback resistances being sequentially connected in series, and one end of feedback resistance group and the other end of start-up resistor connect, and the other end of feedback resistance group is connect with the other end of concussion crystal；Switching group includes multiple feedback resistance control switches for controlling feedback resistance, and each feedback resistance control switch controls at least one feedback resistance access crystal oscillating circuit；Logic control module is connect with switching group and concussion crystal respectively.The present invention improves the job stability of respective drive circuit.
Description
Technical field
The present invention relates to circuit design fields, more particularly to a kind of crystal oscillating circuit.
Background technique
As shown in FIG. 1, FIG. 1 is a kind of structural schematic diagrams of existing crystal oscillating circuit.The crystal oscillating circuit 10 packet
Include concussion crystal 11, variable capacitance 12, start-up resistor Rs, feedback resistance Rl and across the switch at the both ends feedback resistance Rl
SW。
The crystal oscillating circuit 10 is in use, switch SW first is closed, at this time using start-up resistor Rs starting concussion crystal
11；After the stable clock signal that crystal 11 to be shaken exports, switch SW is disconnected, using while using start-up resistor Rs and instead
Feed resistance Rl driving concussion crystal 11.
Feedback resistance Rl is added after stablizing due to earthquake crystal 11, leads to the defeated of the clock signal for shaking crystal 11
Frequency and amplitude can generate larger fluctuation out, therefore shake crystal 11 and reach stable state needs again after convert resistance
Regular hour, the clock signal of the fluctuation is biggish for the influence of part sensitive circuit, therefore existing crystal oscillation is electric
Signal output pulsation when the carry out start-up resistor switching on road is larger, and the influence to respective drive circuit is also larger.
Summary of the invention
The embodiment of the present invention provides a kind of smaller and influence to respective drive circuit of output signal fluctuation also lesser crystalline substance
Oscillation body circuit；It is larger with signal output pulsation when solving existing crystal oscillating circuit progress start-up resistor switching, to phase
That answers driving circuit influences also larger technical problem.
The embodiment of the present invention provides a kind of crystal oscillating circuit comprising:
Crystal is shaken, for exporting the resonant cavity for forming oscillating circuit；
Tunable capacitor, one end are connect with one end of the concussion crystal, and the other end is another with the concussion crystal
End connection；
Start-up resistor, one end with it is described concussion crystal one end connect, the other end pass through feedback resistance group with it is described
Shake the other end connection of crystal；
The feedback resistance group, including the multiple feedback resistances being sequentially connected in series, one end of the feedback resistance group with it is described
The other end of start-up resistor connects, and the other end of the feedback resistance group is connect with the other end of the concussion crystal；
Switching group, including multiple feedback resistance control switches for controlling the feedback resistance, each feedback resistance control
At least one described feedback resistance of switch control processed accesses the crystal oscillating circuit；And
Logic control module, for controlling the feedback resistance control switch, the Logic control module respectively with it is described
Switching group and concussion crystal connection.
In crystal oscillating circuit of the present invention, the feedback resistance control switch and the feedback resistance one are a pair of
It answers.
In crystal oscillating circuit of the present invention, the Logic control module is for detecting the clock signal
The counter of number of peaks, when crystal oscillating circuit starting, the Logic control module presses the setting peak of clock signal
Value quantity successively disconnects the feedback resistance control switch.
In crystal oscillating circuit of the present invention, the Logic control module disconnects the step of feedback resistance control switch
Suddenly include:
It is provided with n setting number of peaks, sets 1 for m, wherein n is the positive integer more than or equal to 2；
The counter starts counting, and when the count value of the counter is equal to m-th of setting number of peaks, disconnects m
A feedback resistance control switch；
By the counting value returns of the counter, m=m+1 returns to counting step until m=n+1.
In crystal oscillating circuit of the present invention, when the feedback resistance is roughly equal, disconnection is fed back earlier
The setting number of peaks of the corresponding clock signal of resistance control switch is larger.
In crystal oscillating circuit of the present invention, when the setting number of peaks of the clock signal is roughly equal,
It is smaller to disconnect the corresponding feedback resistance of feedback resistance control switch earlier.
In crystal oscillating circuit of the present invention, the Logic control module is for detecting the clock signal
The peak detector of signal peak, when crystal oscillating circuit starting, the Logic control module is set as clock signal
Determine signal peak and successively disconnects the feedback resistance control switch.
In crystal oscillating circuit of the present invention, the Logic control module disconnects the feedback resistance control switch
The step of include:
It is provided with n setting signal peak value, sets 1 for m, wherein n is the positive integer more than or equal to 2；
The peak detector starts signal detection peak value, and the signal peak of the peak detector detection is equal to m-th
When setting signal peak value, m-th of feedback resistance control switch is disconnected；
M=m+1, return signal peak detection step is until m=n+1.
In crystal oscillating circuit of the present invention, when the feedback resistance is roughly equal, disconnection is fed back earlier
The growth rate of the signal peak of the corresponding clock signal of resistance control switch is smaller.
In crystal oscillating circuit of the present invention, when the growth rate of the setting peak value of the clock signal is roughly equal
When, it is smaller to disconnect the corresponding feedback resistance of feedback resistance control switch earlier.
Compared to the prior art, crystal oscillating circuit of the invention uses feedback resistance group, switching group and logic control
Module is added in crystal oscillating circuit one by one to control feedback resistance, reduces the fluctuating range and frequency of output signal,
Improve the job stability of respective drive circuit；The existing crystal oscillating circuit of effective solution carries out start-up resistor switching
When signal output pulsation it is larger, influence to respective drive circuit also larger technical problem.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of existing crystal oscillating circuit；
Fig. 2 is the structural schematic diagram of the first embodiment of crystal oscillating circuit of the invention；
Fig. 3 is the structural schematic diagram of the second embodiment of crystal oscillating circuit of the invention.
Specific embodiment
The explanation of following embodiment is to can be used to the particular implementation of implementation to illustrate the present invention with reference to additional schema
Example.
Referring to figure 2., Fig. 2 is the structural schematic diagram of the first embodiment of crystal oscillating circuit of the invention.The present embodiment
Crystal oscillating circuit 20 include concussion crystal 21, tunable capacitor 22, start-up resistor 23, feedback resistance group 24, switching group 25 with
And Logic control module.
Concussion crystal 21 is used to form the resonant cavity of oscillating circuit.22 one end of tunable capacitor and one end of concussion crystal 21 connect
It connects, the other end is connect with the other end of concussion crystal 21.23 one end of start-up resistor is connect with one end of concussion crystal 21, the other end
It is connect by feedback resistance group 24 with the other end of concussion crystal 21.Feedback resistance group 24 includes the multiple feedbacks electricity being sequentially connected in series
Resistance 241, one end of feedback resistance group 24 is connect with the other end of start-up resistor 23, and the other end of feedback resistance group 24 and concussion are brilliant
The other end of body 21 connects.Switching group 25 includes multiple feedback resistance control switches 251 for controlling feedback resistance 241, often
A feedback resistance control switch 251 controls at least one feedback resistance 241 and accesses crystal oscillating circuit 20.Logic control module is used
In control feedback resistance control switch 251, Logic control module is connect with switching group 25 and concussion crystal 21 respectively.
As shown in Fig. 2, in the present embodiment, Logic control module is the counting for detecting the number of peaks of clock signal
Device 26, when crystal oscillating circuit 20 starts, counter 26 is successively disconnected corresponding anti-by the setting number of peaks of clock signal
Feed resistance control switch 251.The feedback resistance control switch 251 and feedback resistance 241 correspond.
The crystal oscillating circuit 20 of the present embodiment is avoided by the way that feedback resistance 241 is sequentially ingressed into crystal oscillating circuit 20
Crystal oscillating circuit 20 output signal fluctuation it is excessive, and the influence to respective drive circuit is smaller.
The crystal oscillating circuit 20 of the present embodiment in use, be provided with n setting number of peaks, each setting peak value first
Quantity corresponds to a feedback resistance control switch 251.
When crystal oscillating circuit 20 starts, all feedback resistance control switches 251 are in closed form in switching group 25
State, at this moment only start-up resistor 23 is linked into crystal oscillating circuit 20, since start-up resistor 23 is smaller, crystal oscillation electricity
It road 2 can fast and stable starting.
This hour counter 26 starts to calculate the number of peaks of the clock signal in 20 circuit of crystal oscillating circuit, works as counter
When 26 count value is equal to first setting number of peaks, corresponding first feedback resistance control switch 251 is disconnected.Then meter
The counting value returns of number device 26, counter 26 start again at the peak value for calculating the clock signal in crystal oscillating circuit circuit
Amount disconnects corresponding second feedback resistance control and opens when the count value of counter 26 is equal to second setting number of peaks
Close 251.... until 26 n-th of counter starts to calculate the number of peaks of the clock signal in 20 circuit of crystal oscillating circuit,
When the count value of counter 26 is equal to n-th of setting number of peaks, corresponding n-th of feedback resistance control switch 251 is disconnected.
Feedback resistance control switches 251 all in this way disconnects, and all feedback resistances 241 are linked into crystal oscillation electricity
In road 20, since feedback resistance 241 is gradually linked into crystal oscillating circuit 20, preferably crystal can be avoided to shake
The fluctuation for swinging the output signal of circuit 20 is excessive.
Specifically, since the feedback resistance 241 in subsequent crystallographic oscillating circuit 20 is increasing, unit time access
Feedback resistance 241 can also suitably increase, with accelerate access feedback resistance 241 speed.
When all feedback resistances 241 are roughly equal, the corresponding clock of feedback resistance control switch 251 earlier is disconnected
The setting number of peaks of signal is larger, and the opening velocity of feedback resistance control switch 251 is gradually accelerated, such unit time early period
Total resistance value of the feedback resistance 241 of access is smaller, and total resistance value of the feedback resistance 241 of following unitary time access is larger.
When the setting number of peaks of clock signal is roughly equal, it is corresponding to disconnect feedback resistance control switch 251 earlier
Feedback resistance 241 it is smaller, feedback resistance control switch 251 successively disconnects in the same time interval, equally can achieve in this way
Total resistance value of the feedback resistance 241 of unit time early period access is smaller, total resistance of the feedback resistance 241 of following unitary time access
It is worth biggish effect.
The crystal oscillating circuit of the present embodiment uses feedback resistance group, switching group and counter, by numerically controlled
Mode is added in crystal oscillating circuit one by one to control feedback resistance, reduces the fluctuating range and frequency of output signal,
Improve the job stability of respective drive circuit.
Referring to figure 3., Fig. 3 is the structural schematic diagram of the second embodiment of crystal oscillating circuit of the invention.The present embodiment
Crystal oscillating circuit 30 include concussion crystal 31, tunable capacitor 32, start-up resistor 33, feedback resistance group 34, switching group 35 with
And Logic control module.
Concussion crystal 31 is used to form the resonant cavity of oscillating circuit.32 one end of tunable capacitor and one end of concussion crystal 31 connect
It connects, the other end is connect with the other end of concussion crystal 31.33 one end of start-up resistor is connect with one end of concussion crystal 31, the other end
It is connect by feedback resistance group 34 with the other end of concussion crystal 31.Feedback resistance group 34 includes the multiple feedbacks electricity being sequentially connected in series
Resistance 341, one end of feedback resistance group 341 is connect with the other end of start-up resistor 33, the other end of feedback resistance group 34 and concussion
The other end of crystal 31 connects.Switching group 35 includes multiple feedback resistance control switches 351 for controlling feedback resistance, each
Feedback resistance control switch 351 controls at least one feedback resistance 341 and accesses crystal oscillating circuit 30.Logic control module is used for
Feedback resistance control switch 351 is controlled, Logic control module is connect with switching group 35 and concussion crystal 31 respectively.
As shown in figure 3, in the present embodiment, Logic control module is the peak value for detecting the signal peak of clock signal
Detector 36, when crystal oscillating circuit 30 starts, peak detector 36 is successively disconnected by the setting signal peak value of clock signal
Corresponding feedback resistance control switch 351.The feedback resistance control switch 351 and feedback resistance 341 correspond.
The crystal oscillating circuit 30 of the present embodiment is avoided by the way that feedback resistance 341 is sequentially ingressed into crystal oscillating circuit 30
Crystal oscillating circuit 30 output signal fluctuation it is excessive, and the influence to respective drive circuit is smaller.
The crystal oscillating circuit 30 of the present embodiment in use, be provided with n setting signal peak value, each setting signal first
Peak value corresponds to a feedback resistance control switch 351.
When crystal oscillating circuit 30 starts, all feedback resistance control switches 351 are in closed form in switching group 35
State, at this moment only start-up resistor 33 is linked into crystal oscillating circuit 30, since start-up resistor 33 is smaller, crystal oscillation electricity
It road 30 can fast and stable starting.
At this moment peak detector 36 starts to detect the signal detection peak value of the clock signal in 30 circuit of crystal oscillating circuit,
When the signal peak that peak detector 36 detects is equal to first setting signal peak value, corresponding first feedback electricity is disconnected
Hinder control switch 351.Since subsequent setting signal peak value can be increasing, do not need to answer peak detector 36 here
Bit manipulation, peak detector 36 restart to detect the signal detection peak value of the clock signal in 30 circuit of crystal oscillating circuit,
When peak detector 36 detects that signal peak is equal to second setting signal peak value, corresponding second feedback resistance is disconnected
Control switch 351.... until 36 n-th of peak detector starts to detect the clock signal in 30 circuit of crystal oscillating circuit
Signal detection peak value disconnects corresponding n-th when the signal peak of peak detector 36 is equal to n-th of setting number of peaks
Feedback resistance control switch.
Feedback resistance control switches 351 all in this way disconnects, and all feedback resistances 341 are linked into crystal oscillation electricity
In road 30, since feedback resistance 341 is gradually linked into crystal oscillating circuit 30, preferably crystal can be avoided to shake
The fluctuation for swinging the output signal of circuit 30 is excessive.
Specifically, since the feedback resistance 341 in subsequent crystallographic oscillating circuit 30 is increasing, unit time access
Feedback resistance 341 can also suitably increase, with accelerate access feedback resistance 341 speed.
When all feedback resistances 341 are roughly equal, the corresponding clock of feedback resistance control switch 351 earlier is disconnected
The growth rate of the signal peak of signal is smaller, and the opening velocity of feedback resistance control switch 351 is gradually accelerated, such unit early period
Total resistance value of the feedback resistance 341 of time access is smaller, and total resistance value of the feedback resistance 341 of following unitary time access is larger.
When the growth rate of the setting peak value of clock signal is roughly equal, feedback resistance control switch 351 earlier is disconnected
Corresponding feedback resistance 341 is smaller, and feedback resistance control switch 351 successively disconnects in the same time interval, so equally can be with
The total resistance value for reaching the feedback resistance 341 of unit time early period access is smaller, the feedback resistance 341 of following unitary time access
The biggish effect of total resistance value.
The crystal oscillating circuit of the present embodiment uses feedback resistance group, switching group and peak detector, is controlled by simulation
The mode of system is added in crystal oscillating circuit one by one to control feedback resistance, reduces the fluctuating range and frequency of output signal
Rate improves the job stability of respective drive circuit.
Crystal oscillating circuit of the invention controls feedback electricity using feedback resistance group, switching group and Logic control module
Resistance is added in crystal oscillating circuit one by one, reduces the fluctuating range and frequency of output signal, shortens crystal oscillation electricity
The starting time on road and stable time, improve the job stability of respective drive circuit；The existing crystalline substance of effective solution
Signal output pulsation when oscillation body circuit carries out start-up resistor switching is larger, influence to respective drive circuit also biggish skill
Art problem.
Although the serial number before embodiment only makes for convenience of description in conclusion the present invention is disclosed above with embodiment
With not causing to limit to the sequence of various embodiments of the present invention.Also, above-described embodiment is not intended to limit the invention, this field
Those of ordinary skill, without departing from the spirit and scope of the present invention, can make it is various change and retouch, therefore it is of the invention
Protection scope subjects to the scope of the claims.
Claims (10)
1. a kind of crystal oscillating circuit characterized by comprising
Crystal is shaken, the resonant cavity of oscillating circuit is used to form；
Tunable capacitor, one end are connect with one end of the concussion crystal, and the other end of the other end and the concussion crystal connects
It connects；
Start-up resistor, one end are connect with one end of the concussion crystal, and the other end passes through feedback resistance group and the concussion
The other end of crystal connects；
The feedback resistance group, including the multiple feedback resistances being sequentially connected in series, one end of the feedback resistance group and the starting
The other end of resistance connects, and the other end of the feedback resistance group is connect with the other end of the concussion crystal；
Switching group, including multiple feedback resistance control switches for controlling the feedback resistance, each feedback resistance control is opened
Close at least one described crystal oscillating circuit of feedback resistance access of control；And
Logic control module, for controlling the feedback resistance control switch, the Logic control module respectively with the switch
Group and concussion crystal connection.
2. crystal oscillating circuit according to claim 1, which is characterized in that the feedback resistance control switch and described anti-
Feed resistance corresponds.
3. crystal oscillating circuit according to claim 1, which is characterized in that the Logic control module is for detecting
The counter for stating the number of peaks of clock signal, when crystal oscillating circuit starting, the Logic control module presses clock
The setting number of peaks of signal successively disconnects the feedback resistance control switch.
4. crystal oscillating circuit according to claim 3, which is characterized in that the Logic control module disconnects feedback resistance
The step of control switch includes:
It is provided with n setting number of peaks, sets 1 for m, wherein n is the positive integer more than or equal to 2；
The counter starts counting, and when the count value of the counter is equal to m-th of setting number of peaks, disconnects m-th instead
Feed resistance control switch；
By the counting value returns of the counter, m=m+1 returns to counting step until m=n+1.
5. crystal oscillating circuit according to claim 3, which is characterized in that when the feedback resistance is roughly equal, break
The setting number of peaks for opening the corresponding clock signal of feedback resistance control switch earlier is larger.
6. crystal oscillating circuit according to claim 3, which is characterized in that when the setting number of peaks of the clock signal
When roughly equal, it is smaller to disconnect the corresponding feedback resistance of feedback resistance control switch earlier.
7. crystal oscillating circuit according to claim 1, which is characterized in that the Logic control module is for detecting
The peak detector for stating the signal peak of clock signal, when crystal oscillating circuit starting, the Logic control module is pressed
The setting signal peak value of clock signal successively disconnects the feedback resistance control switch.
8. crystal oscillating circuit according to claim 7, which is characterized in that the Logic control module disconnects the feedback
The step of resistance control switch includes:
It is provided with n setting signal peak value, sets 1 for m, wherein n is the positive integer more than or equal to 2；
The peak detector starts signal detection peak value, and the signal peak of the peak detector detection is equal to m-th of setting
When signal peak, m-th of feedback resistance control switch is disconnected；
M=m+1, return signal peak detection step is until m=n+1.
9. crystal oscillating circuit according to claim 6, which is characterized in that when the feedback resistance is roughly equal, break
The growth rate for opening the signal peak of the corresponding clock signal of feedback resistance control switch earlier is smaller.
10. crystal oscillating circuit according to claim 6, which is characterized in that when the setting peak value of the clock signal
When growth rate is roughly equal, it is smaller to disconnect the corresponding feedback resistance of feedback resistance control switch earlier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910075220.3A CN109831161B (en) | 2019-01-25 | 2019-01-25 | Crystal oscillation circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910075220.3A CN109831161B (en) | 2019-01-25 | 2019-01-25 | Crystal oscillation circuit |
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| Publication Number | Publication Date |
|---|---|
| CN109831161A true CN109831161A (en) | 2019-05-31 |
| CN109831161B CN109831161B (en) | 2023-04-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910075220.3A Active CN109831161B (en) | 2019-01-25 | 2019-01-25 | Crystal oscillation circuit |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001257534A (en) * | 2000-03-09 | 2001-09-21 | Asahi Kasei Microsystems Kk | Crystal oscillator |
| JP2004128593A (en) * | 2002-09-30 | 2004-04-22 | Kinseki Ltd | Oscillation circuit |
| CN1649253A (en) * | 2004-01-29 | 2005-08-03 | 凌阳科技股份有限公司 | Crystal Accelerated Oscillator Circuit |
| CN102273065A (en) * | 2010-01-25 | 2011-12-07 | 松下电器产业株式会社 | oscillator circuit |
| US20120049894A1 (en) * | 2010-04-20 | 2012-03-01 | Rf Micro Devices, Inc. | Dc-dc converter current sensing |
| CN104253587A (en) * | 2013-06-27 | 2014-12-31 | 上海海尔集成电路有限公司 | Crystal oscillator |
-
2019
- 2019-01-25 CN CN201910075220.3A patent/CN109831161B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001257534A (en) * | 2000-03-09 | 2001-09-21 | Asahi Kasei Microsystems Kk | Crystal oscillator |
| JP2004128593A (en) * | 2002-09-30 | 2004-04-22 | Kinseki Ltd | Oscillation circuit |
| CN1649253A (en) * | 2004-01-29 | 2005-08-03 | 凌阳科技股份有限公司 | Crystal Accelerated Oscillator Circuit |
| CN102273065A (en) * | 2010-01-25 | 2011-12-07 | 松下电器产业株式会社 | oscillator circuit |
| US20120049894A1 (en) * | 2010-04-20 | 2012-03-01 | Rf Micro Devices, Inc. | Dc-dc converter current sensing |
| CN104253587A (en) * | 2013-06-27 | 2014-12-31 | 上海海尔集成电路有限公司 | Crystal oscillator |
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| Publication number | Publication date |
|---|---|
| CN109831161B (en) | 2023-04-28 |
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