CN117691951A - Crystal oscillator driving circuit - Google Patents
Crystal oscillator driving circuit Download PDFInfo
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- CN117691951A CN117691951A CN202311812055.8A CN202311812055A CN117691951A CN 117691951 A CN117691951 A CN 117691951A CN 202311812055 A CN202311812055 A CN 202311812055A CN 117691951 A CN117691951 A CN 117691951A
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- 239000013078 crystal Substances 0.000 title claims abstract description 70
- 230000010355 oscillation Effects 0.000 claims abstract description 17
- 239000003990 capacitor Substances 0.000 claims description 40
- 238000002347 injection Methods 0.000 claims description 15
- 239000007924 injection Substances 0.000 claims description 15
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 239000010453 quartz Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000003491 array Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Abstract
The application provides a crystal oscillator driving circuit, which is used for driving a crystal oscillator to output a clock signal, and comprises a power supply module, a starting module and a frequency adjusting module which are connected with each other; the power supply module is used for supplying power to the vibration starting module and the frequency adjusting module; the oscillation starting module is used for controlling the oscillation of the crystal oscillator and further outputting a clock signal; the frequency adjustment module is used for adjusting the frequency of the clock signal to a target frequency. When the clock signal output by the crystal oscillator does not meet the requirement and the frequency of the clock signal deviates from the target frequency, the frequency of the clock signal can be adjusted to the target frequency meeting the requirement through the frequency adjusting module, so that the problem of frequency deviation of the clock signal is solved, and the stability of the clock signal is improved.
Description
Technical Field
The present disclosure relates to the field of circuit technologies, and in particular, to a crystal oscillator driving circuit.
Background
With the advancement of automobile intelligent technology, especially in application scenarios such as keyless entry systems, remote parking systems and the like, more new requirements are put on the stability and power consumption of a crystal oscillator for generating a chip reference clock, and the crystal oscillator cannot simply wake up to generate a clock signal any more, and more starting designs are required to meet the requirements of more stability and lower power consumption.
Disclosure of Invention
Accordingly, an object of the present invention is to provide a crystal oscillator driving circuit, which can adjust the frequency of a clock signal to a target frequency meeting the requirement through a frequency adjusting module, thereby improving the stability of the clock signal. The specific scheme is as follows:
in one aspect, the present application provides a crystal oscillator driving circuit, where the crystal oscillator driving circuit is configured to drive a crystal oscillator to generate a clock signal, and the crystal oscillator driving circuit includes a power module, a starting module, and a frequency adjustment module that are connected to each other;
the power supply module is used for supplying power to the vibration starting module and the frequency adjusting module;
the oscillation starting module is used for controlling the crystal oscillator to vibrate and further outputting the clock signal;
the frequency adjustment module is used for adjusting the frequency of the clock signal to a target frequency.
In one possible implementation, the frequency adjustment module comprises an active inductance module;
the active inductance module comprises a gyrator and a capacitor and is used for adjusting the frequency of the clock signal to the target frequency according to a first frequency adjustment step length.
In one possible implementation, the frequency adjustment module further includes a switched capacitor array module connected to the active inductor module;
the switch capacitor array module comprises a multi-bit binary structure capacitor array, and is used for adjusting the frequency of the clock signal to the target frequency according to a second frequency adjustment step length, wherein the second frequency adjustment step length is smaller than the first frequency adjustment step length.
In one possible implementation, the starting module includes an energy injection circuit and a starting circuit;
the energy injection circuit is used for increasing the current input to the starting circuit so as to accelerate the starting speed; the oscillation starting circuit is used for controlling the crystal oscillator to vibrate by utilizing the current, and further outputting the clock signal.
In one possible implementation, the energy injection circuit includes a ring oscillator for increasing the current input to the starting circuit so as to increase the starting speed.
In one possible implementation, the energy injection circuit further comprises a trigger for controlling the turn-off of the ring oscillator.
In one possible implementation, the power supply module includes a bandgap reference module including a self-biased high swing cascode current source for providing a reference current.
In one possible implementation, the power module further includes a linear regulator for stabilizing the reference current.
In one possible implementation, the linear voltage regulator includes a source follower.
In one possible implementation, the crystal oscillator drive circuit further includes a reference circuit including an error amplifier of a folded cascode configuration.
The embodiment of the application provides a crystal oscillator driving circuit, which is used for driving a crystal oscillator to output clock signals, and comprises a power supply module, a starting module and a frequency adjusting module which are connected with each other; the power supply module is used for supplying power to the vibration starting module and the frequency adjusting module; the oscillation starting module is used for controlling the oscillation of the crystal oscillator and further outputting a clock signal; the frequency adjustment module is used for adjusting the frequency of the clock signal to a target frequency. When the clock signal output by the crystal oscillator does not meet the requirement and the frequency of the clock signal deviates from the target frequency, the frequency of the clock signal can be adjusted to the target frequency meeting the requirement through the frequency adjusting module, so that the problem of frequency deviation of the clock signal is solved, and the stability of the clock signal is improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 shows a schematic structural diagram of a crystal oscillator driving circuit according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a driving circuit of another crystal oscillator according to an embodiment of the present disclosure;
fig. 3 shows a schematic structural diagram of an active inductor module according to an embodiment of the present application;
fig. 4 shows a schematic structural diagram of a differential ring oscillator according to an embodiment of the present application.
Detailed Description
In order to make the above objects, features and advantages of the present application more comprehensible, embodiments accompanied with figures are described in detail below.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, but the present application may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present application is not limited to the specific embodiments disclosed below.
Next, the present application will be described in detail with reference to the schematic drawings, wherein the cross-sectional views of the device structure are not to scale for the sake of illustration, and the schematic drawings are merely examples, which should not limit the scope of protection of the present application. In addition, the three-dimensional dimensions of length, width and depth should be included in actual fabrication.
For easy understanding, a crystal oscillator driving circuit according to an embodiment of the present application will be described in detail with reference to the accompanying drawings.
Referring to fig. 1, a schematic structural diagram of a crystal oscillator driving circuit according to an embodiment of the present application is shown, where the crystal oscillator driving circuit includes a power module, a vibration starting module and a frequency adjusting module that are connected to each other, the crystal oscillator driving circuit is connected to the crystal oscillator, one end of the crystal oscillator is grounded through a capacitor connection, and the other end of the crystal oscillator is also grounded through a capacitor connection.
The crystal oscillator driving circuit can be used for driving a crystal oscillator so that the crystal oscillator can oscillate to generate a clock signal. The power supply can be provided for the crystal oscillator driving circuit so as to ensure the normal operation of the crystal oscillator driving circuit. The power module inside the crystal oscillator driving circuit can be connected with the starting module and used for supplying power to the starting module, and the power module can also be connected with the frequency adjusting module and used for supplying power to the frequency adjusting module. The oscillation starting module can be connected with the crystal oscillator and can control the crystal oscillator to oscillate, so that the crystal oscillator can generate a clock signal. In addition, the control signal can be input to the starting module to control the starting module to start. The oscillation starting module can output a signal, namely, output a clock signal after controlling the crystal oscillator to oscillate.
Since the frequency of the clock signal generated by the crystal oscillator may fluctuate, for example, due to environmental factors, process factors, etc., the clock signal may be unstable under the same environment or process conditions, and the clock signal may also fluctuate under different temperature conditions, the frequency of the clock signal needs to be adjusted.
The crystal oscillator driving circuit can further comprise a frequency adjusting module, the frequency adjusting module can be connected with the crystal oscillator and connected with the starting module, when the clock signal does not meet the requirement and the frequency of the clock signal is unstable, the frequency adjusting module can be used for adjusting the frequency of the clock signal, the frequency adjusting module can comprise electronic components such as a capacitor and an inductor, the frequency of the clock signal output by the starting module can be adjusted by adjusting the opening or closing of the electronic components, and accordingly the frequency of the clock signal can be adjusted to a target frequency by the frequency adjusting module, wherein the target frequency can be preset frequency meeting the requirement, so that the frequency of the clock signal under different environments or process conditions can be kept stable, the frequency of the clock signal under the same environment or process condition can be kept stable under different moments, and the stability of the clock signal can be improved from various aspects.
In one possible implementation manner, the frequency adjusting module may include an active inductance module, with reference to fig. 2, which is a schematic structural diagram of a crystal oscillator driving circuit provided in an embodiment of the present application, where the active inductance module may include a gyrator and a capacitor, that is, may adopt a gyrator-capacitor-gyrator structure, with reference to fig. 3, which is a schematic structural diagram of an active inductance module provided in an embodiment of the present application, and the active inductance module may be connected to the crystal oscillator, and includes 4 gyrators Gm and 1 capacitor.
The frequency of the clock signal can be adjusted by adjusting the gyrator or the capacitor, the active inductance module can be provided with an inductance frequency modulation curve, the inductance frequency modulation curve corresponds to a frequency change value for adjusting the frequency of the clock signal, the active inductance module can be adjusted to a target frequency by a first frequency adjustment step length, wherein the first frequency adjustment step length is an adjustable frequency change value of the active inductance module, for example, the first frequency adjustment step length is 2MHz, the frequency change of the clock signal can be adjusted by changing the internal structure of the active inductance module, and therefore rough adjustment of the frequency of the clock signal after the starting of the oscillation is achieved, and the stability of the frequency of the clock signal is improved.
The active inductance module can adjust the frequency of the clock signal, and has only one first frequency adjustment step length, namely an inductance frequency modulation curve. Of course, the active inductance module may also adjust the frequency of the clock signal multiple times, and the active inductance module has multiple first frequency adjustment steps, that is, multiple inductance frequency modulation curves, which is not limited herein.
In addition, the active inductance module can convert the capacitance into inductance by utilizing the characteristic of the gyrator, so that the negative influence of parasitic capacitance on the maximum negative resistance values at two ends of the crystal oscillator is reduced, and extra negative resistance can be provided for the quartz crystal when the crystal oscillator starts vibrating, so that the vibration starting speed is accelerated, the frequency stability of a clock signal can be ensured, and the vibration starting speed can be improved.
The frequency adjustment module may further include a switched capacitor array module connected to the active inductor module, and as shown with reference to fig. 2, the switched capacitor array module is formed by capacitors on both sides of the active inductor module. The switch capacitor array module comprises a multi-bit binary structure capacitor array, wherein the multi-bit binary structure capacitor array can realize the conduction combination of more types of capacitors, such as a 2-bit binary structure capacitor array, and the multi-bit binary structure capacitor array can have 00, 01, 10 and 11, wherein 00 can be conducted corresponding to one capacitor, 01 can be conducted corresponding to two capacitors, 10 can be conducted corresponding to three capacitors, 11 can be conducted corresponding to four capacitors, and the frequency of a clock signal can be adjusted to different degrees in each conduction mode. To more accurately adjust for frequency variations, providing a greater variety of capacitive combinations, the switched capacitor array module may provide a greater number of bits of binary structured capacitor array, i.e., more than 10 bits of binary structured capacitor array, such as the switched capacitor array module may be an 11-bit binary structured capacitor array.
The frequency change value realized by the switch capacitor array module can be recorded as a second frequency adjustment step size, and because the switch capacitor array module can provide more capacitance combination forms, the switch capacitor array module can have a plurality of frequency change values, i.e. the second frequency adjustment step size can be a plurality of, for example, 0.2MHz, 0.05MHz, 0.5MHz, etc., the switch capacitor array module can adjust the frequency of the clock signal to the target frequency according to the second frequency adjustment step size, each second frequency adjustment step size is smaller than the first frequency adjustment step size, for example, the first frequency adjustment step size is 2MHz, and the second frequency adjustment step size is 0.2MHz, that is, the difference value before and after the frequency adjustment corresponding to the switch capacitor array module can be smaller than the difference value before and after the frequency adjustment corresponding to the active inductance module. Compared with an active inductance module, the switch capacitor array module can carry out finer adjustment on clock signal frequency, the frequency adjustment step length is smaller, more accurate frequency adjustment can be realized on clock signals of a crystal oscillator, in addition, the switch capacitor array module can provide more frequency adjustment change values, temperature-frequency curve offset caused by factors such as environment and technology can be corrected, stability of clock signal frequency under different temperature conditions is further improved, the temperature-frequency curve is enabled to be more stable as much as possible, stability of clock signal frequency at different moments under the same condition can be improved, and accordingly frequency fluctuation of clock signals is reduced as much as possible, and stability is kept.
In the embodiment of the application, the power supply module can provide lower noise so as to ensure the stability of the clock signal frequency, the power supply module can comprise a band gap reference module, the band gap reference module can comprise a self-bias high-swing cascode current source, the self-bias high-swing cascode current source is used as a reference current to provide reference voltage for a reference circuit, the vibration starting module can be provided with the reference circuit, the frequency adjusting module is also provided with the reference circuit, and the reference circuit can ensure the normal starting of the vibration starting module and the frequency adjusting module. The reference circuit can comprise an error amplifier with a folded cascode structure, so that the gain can be improved, and the frequency stability of a clock signal can be improved.
The power supply module may further include a linear regulator for stabilizing the reference current, and the linear regulator may include a source follower to increase a circuit driving capability of the error amplifier.
In this application embodiment, the module that shakes can include energy injection circuit and play the circuit that shakes, energy injection circuit is used for increasing the electric current of inputting to the circuit that shakes, for example, ordinary play the module that shakes can be with the partly input of the electric current that power module carried to play the circuit that shakes, this application can make more electric currents input to play the circuit that shakes through increasing energy injection circuit, certainly, can not surpass the electric current that power module carried, like this, through making the electric current that inputs to play the circuit that shakes increase, can accelerate crystal oscillator's play shake speed, the energy loss when having reduced the awakening. The oscillation starting circuit is used for controlling the oscillation of the crystal oscillator by utilizing current, and further outputting a clock signal.
Specifically, the energy injection circuit may include a ring oscillator, for example, a differential ring oscillator, as shown in fig. 4, which is a schematic structural diagram of a differential ring oscillator provided in an embodiment of the present application, C1 to C4 are split capacitor arrays, and the differential ring oscillator may generate two output signals with a phase difference of 180 ° and provide constant frequency injection, and the ring oscillator is used to increase a current input to the oscillation starting circuit so as to increase an oscillation starting speed.
The energy injection circuit may further include a trigger, such as a cascaded D-trigger, where the trigger is configured to control the ring oscillator to be turned off, and after the ring oscillator outputs a preset period, for example 1024 periods, the ring oscillator may be controlled to be turned off by the cascaded D-trigger, and by timely turning off the ring oscillator, power consumption waste may be avoided. In addition, after the ring oscillator is closed, the ring oscillator becomes a plurality of parallel-connected Peltier oscillators, so that the starting of the crystal oscillator is ensured.
That is, the ring oscillator can control the working time through the cascaded D trigger, so that the ring oscillator achieves the best energy injection effect, thereby increasing the initial current when the quartz crystal starts vibrating, accelerating the vibrating speed and avoiding the generation of power consumption waste.
The embodiment of the application provides a crystal oscillator driving circuit, which is used for driving a crystal oscillator to output clock signals, and comprises a power supply module, a starting module and a frequency adjusting module which are connected with each other; the power supply module is used for supplying power to the vibration starting module and the frequency adjusting module; the oscillation starting module is used for controlling the oscillation of the crystal oscillator and further outputting a clock signal; the frequency adjustment module is used for adjusting the frequency of the clock signal to a target frequency. When the clock signal output by the crystal oscillator does not meet the requirement and the frequency of the clock signal deviates from the target frequency, the frequency of the clock signal can be adjusted to the target frequency meeting the requirement through the frequency adjusting module, so that the problem of frequency deviation of the clock signal is solved, and the stability of the clock signal is improved.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments.
The foregoing is merely a preferred embodiment of the present application, and although the present application has been disclosed in the preferred embodiment, it is not intended to limit the present application. Any person skilled in the art may make many possible variations and modifications to the technical solution of the present application, or modify equivalent embodiments, using the methods and technical contents disclosed above, without departing from the scope of the technical solution of the present application. Therefore, any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present application, which do not depart from the content of the technical solution of the present application, still fall within the scope of the technical solution of the present application.
Claims (10)
1. The crystal oscillator driving circuit is characterized by being used for driving a crystal oscillator to generate a clock signal and comprises a power supply module, a starting module and a frequency adjusting module which are connected with each other;
the power supply module is used for supplying power to the vibration starting module and the frequency adjusting module;
the oscillation starting module is used for controlling the crystal oscillator to vibrate and further outputting the clock signal;
the frequency adjustment module is used for adjusting the frequency of the clock signal to a target frequency.
2. The crystal oscillator drive circuit of claim 1, wherein the frequency adjustment module comprises an active inductance module;
the active inductance module comprises a gyrator and a capacitor and is used for adjusting the frequency of the clock signal to the target frequency according to a first frequency adjustment step length.
3. The crystal oscillator drive circuit of claim 2, wherein the frequency adjustment module further comprises a switched capacitor array module coupled to the active inductor module;
the switch capacitor array module comprises a multi-bit binary structure capacitor array, and is used for adjusting the frequency of the clock signal to the target frequency according to a second frequency adjustment step length, wherein the second frequency adjustment step length is smaller than the first frequency adjustment step length.
4. The crystal oscillator drive circuit of claim 1, wherein the start-up module comprises an energy injection circuit and a start-up circuit;
the energy injection circuit is used for increasing the current input to the starting circuit so as to accelerate the starting speed; the oscillation starting circuit is used for controlling the crystal oscillator to vibrate by utilizing the current, and further outputting the clock signal.
5. The crystal oscillator drive circuit of claim 4, wherein the energy injection circuit comprises a ring oscillator for increasing current input to the start-up circuit to increase start-up speed.
6. The crystal oscillator drive circuit of claim 5, wherein the energy injection circuit further comprises a trigger for controlling the turn-off of the ring oscillator.
7. The crystal oscillator drive circuit of claim 1, wherein the power supply module comprises a bandgap reference module comprising a self-biased high swing cascode current source for providing a reference current.
8. The crystal oscillator drive circuit of claim 7, wherein the power module further comprises a linear regulator for stabilizing the reference current.
9. The crystal oscillator drive circuit of claim 8, wherein the linear voltage regulator comprises a source follower.
10. The crystal oscillator drive circuit of claim 1, further comprising a reference circuit comprising an error amplifier of a folded cascode configuration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311812055.8A CN117691951A (en) | 2023-12-26 | 2023-12-26 | Crystal oscillator driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311812055.8A CN117691951A (en) | 2023-12-26 | 2023-12-26 | Crystal oscillator driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117691951A true CN117691951A (en) | 2024-03-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311812055.8A Pending CN117691951A (en) | 2023-12-26 | 2023-12-26 | Crystal oscillator driving circuit |
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|---|---|
| CN (1) | CN117691951A (en) |
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2023
- 2023-12-26 CN CN202311812055.8A patent/CN117691951A/en active Pending
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