CN115483924A - Quick start circuit of numerical control crystal oscillator - Google Patents
Quick start circuit of numerical control crystal oscillator Download PDFInfo
- Publication number
- CN115483924A CN115483924A CN202211127382.5A CN202211127382A CN115483924A CN 115483924 A CN115483924 A CN 115483924A CN 202211127382 A CN202211127382 A CN 202211127382A CN 115483924 A CN115483924 A CN 115483924A
- Authority
- CN
- China
- Prior art keywords
- circuit
- frequency
- crystal oscillator
- output end
- phase inverter
- 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.)
- Pending
Links
- 239000013078 crystal Substances 0.000 title claims abstract description 71
- 230000010355 oscillation Effects 0.000 claims abstract description 14
- 230000009471 action Effects 0.000 claims abstract description 4
- 239000003990 capacitor Substances 0.000 claims description 31
- 238000006243 chemical reaction Methods 0.000 claims description 22
- 239000010453 quartz Substances 0.000 claims description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 14
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 7
- 238000004891 communication Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L3/00—Starting of generators
Landscapes
- Oscillators With Electromechanical Resonators (AREA)
Abstract
The embodiment of the application provides a quick start circuit of numerical control crystal oscillator, includes: a frequency selection control circuit for generating a frequency control signal based on the frequency selection signal; the quick start circuit is connected with the frequency selection control circuit and used for generating a waveform signal based on the frequency control signal, and the frequency component of the waveform signal comprises a target resonant frequency; and the numerical control crystal oscillator is connected with the quick starting circuit and is used for generating resonance under the action of the waveform signal and starting oscillation on the target resonance frequency until stable oscillation is realized. In the quick start circuit of the numerical control crystal oscillator, by arranging the frequency selection control circuit and the quick start circuit, the frequency component of the waveform signal generated by the quick start circuit comprises the target resonant frequency, so that the Q value of the quick start circuit can be improved, and larger initial energy can be provided for the numerical control crystal oscillator, so that the numerical control crystal oscillator can start oscillation quickly, the start time is shortened, and the power consumption of a system is reduced.
Description
Technical Field
The present application relates to the field of circuit technologies, and in particular, to a fast start circuit for a digital controlled crystal oscillator.
Background
SOC (System-on-a-Chip) chips require a stable reference clock and are typically implemented by both an off-Chip crystal (quartz crystal resonator) and an on-Chip DCXO (digitally controlled crystal oscillator), however, in most cases, the start-up process of the DCXO is several ms. In communication chip applications, the start-up time of the DCXO is one of the main sources of system power consumption. At present, the problems of long DCXO starting time and large system power consumption generally exist.
Disclosure of Invention
Therefore, a need exists for a fast start circuit of a digital controlled crystal oscillator, which is used for solving the problems of long start time, large system power consumption and the like of the digital controlled crystal oscillator in the prior art.
The embodiment of the application provides a quick start circuit of numerical control crystal oscillator, includes:
a frequency selection control circuit for generating a frequency control signal based on the frequency selection signal;
the quick starting circuit is connected with the frequency selection control circuit and used for generating a waveform signal based on the frequency control signal, and the frequency component of the waveform signal comprises a target resonant frequency;
and the numerical control crystal oscillator is connected with the quick starting circuit and is used for generating resonance under the action of the waveform signal and starting oscillation on the target resonance frequency until stable oscillation is realized.
In the quick start circuit of the numerical control crystal oscillator, by arranging the frequency selection control circuit and the quick start circuit, the frequency component of the waveform signal generated by the quick start circuit comprises the target resonant frequency, so that the Q value of the quick start circuit can be improved, and larger initial energy can be provided for the numerical control crystal oscillator, so that the numerical control crystal oscillator can start oscillation quickly, the start time is shortened, and the power consumption of a system is reduced.
Optionally, the frequency selection control circuit comprises:
a frequency control word signal generating module, connected to the frequency selection signal, for generating a frequency control word signal, where the frequency control word signal includes a plurality of required resonant frequencies and control words corresponding to the resonant frequencies;
and the level conversion circuit is connected with the frequency control word signal generation module and is used for generating the frequency control signal based on the frequency control word signal.
Optionally, the frequency selection control circuit further comprises:
the linear resistance control circuit is connected with the frequency control word signal generation module;
and the low dropout linear regulator is connected with the frequency control word signal generation module.
Optionally, the fast start circuit comprises a voltage controlled oscillator.
Optionally, the fast start circuit comprises:
n stages of processing modules are sequentially connected in series, wherein N is more than or equal to 3; each processing module comprises a first input end, a second input end, a grounding end and an output end; the first end of each processing module is connected with the frequency selection control circuit; the second input end of the first-stage processing module is connected with the output end of the Nth-stage processing module, and the second input ends of the other stages of processing modules are connected with the output end of the previous-stage processing module; the grounding ends of the processing modules at all levels are grounded;
and the input end of the differential buffer is connected with the output end of the Nth-stage processing module, and the output end of the differential buffer is connected with the numerical control crystal oscillator.
Optionally, each stage of the processing module includes:
the phase inverter comprises a control end, an input end, a grounding end and an output end, wherein the input end of the phase inverter is the second input end of the processing module, and the output end of the phase inverter is the output end of the processing module;
the input end of the first voltage-current conversion module is connected with the output end of the frequency selection control circuit, and the output end of the first voltage-current conversion module is connected with the control end of the phase inverter;
one end of the first linear resistor is connected with the output end of the frequency selection control circuit, and the other end of the first linear resistor is connected with the control end of the phase inverter;
the input end of the second voltage-current conversion module is connected with the grounding end of the phase inverter, and the output end of the second voltage-current conversion module is grounded;
one end of the second linear resistor is connected with the grounding end of the phase inverter, and the other end of the second linear resistor is grounded;
and the upper polar plate of the capacitor is connected with the output end of the phase inverter, and the lower polar plate of the capacitor is grounded.
Optionally, the fast start circuit includes a first output terminal and a second output terminal; the digitally controlled crystal oscillator includes:
the negative resistance device comprises a first end and a second end which are opposite, the first end of the negative resistance device is connected with the first end of the quick start circuit, and the second end of the negative resistance device is connected with the second end of the quick start circuit;
and the quartz crystal resonator is connected with the negative resistance device in parallel.
Optionally, the negative resistance device comprises:
the input end of the adjustable phase inverter is connected with the first output end of the quick starting circuit, and the output end of the adjustable phase inverter is connected with the second output end of the quick starting circuit;
and one end of the first adjustable resistor is connected with the first output end of the quick starting circuit, and the other end of the first adjustable resistor is connected with the second output end of the quick starting circuit.
Optionally, the digitally controlled crystal oscillator further comprises:
the first node is connected with one end of the quartz crystal resonator;
the second node is connected with the other end of the quartz crystal resonator;
the upper electrode of the first adjustable capacitor is connected with the first node and the input end of the adjustable phase inverter, and the lower electrode of the first adjustable capacitor is grounded;
the upper electrode of the second adjustable capacitor is connected with the second node, and the lower electrode of the second adjustable capacitor is grounded;
and one end of the second adjustable resistor is connected with the output end of the adjustable phase inverter, and the other end of the second adjustable resistor is connected with the upper polar plate of the second adjustable capacitor and the second node.
Optionally, the digitally controlled crystal oscillator further comprises:
and one end of the electrostatic discharge module is connected with the first node, and the other end of the electrostatic discharge module is connected with the input end of the adjustable phase inverter and the upper polar plate of the first adjustable capacitor.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a circuit diagram of a digitally controlled crystal oscillator fast start-up circuit provided herein;
fig. 2 is a circuit diagram of a frequency selection control circuit in a digitally controlled crystal oscillator fast start-up circuit provided in the present application;
fig. 3 is a circuit diagram of a fast start circuit in a digitally controlled crystal oscillator fast start circuit and a digitally controlled crystal oscillator provided in the present application.
Description of reference numerals: 10. an analog-to-digital conversion circuit; 101. a frequency control word signal generation module; 102. a level conversion circuit; 103. a linear resistance control circuit; 104. a low dropout linear regulator; 20. a fast start circuit; 201. a processing module; 2011. an inverter; 2012. a first voltage-to-current conversion module; 2013. a first linear resistance; 2014. a second voltage-to-current conversion module; 2015. a second linear resistance; 2016. a capacitor; 202. a differential buffer; 30. a numerically controlled crystal oscillator; 3011. an adjustable inverter; 3012. a first adjustable resistance; 302. a quartz transistor resonator; 303. a first node; 304. a second node; 305. a first tunable capacitor; 306. a second tunable capacitor; 307. a second adjustable resistor; 308. and an electrostatic discharge module.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein may be combined with other embodiments.
It will be understood that, as used herein, the terms "first," "second," "third," "fourth," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, a first control device may be referred to as a second control device, and similarly, a second control device may be referred to as a first control device, without departing from the scope of the present application. The first control device and the second control device are both control devices, but they are not the same control device.
It is to be understood that "connection" in the following embodiments is to be understood as "electrical connection", "communication connection", and the like if the connected circuits, modules, units, and the like have communication of electrical signals or data with each other.
As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Also, as used in this specification, the term "and/or" includes any and all combinations of the associated listed items.
SOC (System-on-a-Chip) chips require a stable reference clock and are typically implemented by both an off-Chip crystal (quartz crystal resonator) and an on-Chip DCXO (digitally controlled crystal oscillator), although in most cases the start-up procedure is a few ms. In communication chip applications, the start-up time of the DCXO is one of the main sources of system power consumption. In recent years, from the perspective of crystal initial energy, providing an initial signal with monotonous frequency change and containing a resonant frequency to a negative resistance accelerates oscillation starting, but scanning time beyond a target resonant frequency is greatly wasted, and the method is lack of pertinence and is more serious particularly under the influence of process influence and nonlinearity of two ends of a voltage control curve. In recent years, a scheme of injecting initial energy around a target resonant frequency is proposed, but the scheme cannot be applied to a plurality of frequency occasions.
Referring to fig. 1, an embodiment of the present application provides a fast start-up circuit for a digital controlled crystal oscillator, including: a frequency selection control circuit 10, the frequency selection control circuit 10 being configured to generate a frequency control signal based on the frequency selection signal; the quick start circuit 20 is connected with the frequency selection control circuit 10, and is used for generating a waveform signal by a frequency control signal, wherein the frequency component of the waveform signal comprises a target resonance frequency; and the numerical control crystal oscillator 30, the numerical control crystal oscillator 30 is connected with the quick starting circuit 20 and used for generating resonance under the action of the waveform signal and starting oscillation on the target resonance frequency until stable oscillation is realized.
Among the above-mentioned numerical control crystal oscillator quick start circuit, through setting up frequency selection control circuit 10 and quick start circuit 20, the frequency component of the waveform signal that quick start circuit 20 generated includes target resonant frequency, can improve quick start circuit 20's Q value, can provide great initial energy for numerical control crystal oscillator 30 again for numerical control crystal oscillator 30 can start shaking fast, thereby shortens the activation time, reduces the system power consumption.
In an alternative example, referring to fig. 2, the frequency selection control circuit 10 may include: the frequency control word signal generating module 101, the frequency control word signal generating module 101 is connected with the frequency selection signal and is used for generating a frequency control word signal, and the frequency control word signal comprises a plurality of required resonant frequencies and control words corresponding to the resonant frequencies; the level shift circuit 102, the level shift circuit 102 is connected to the frequency control word signal generating module 101, and is configured to generate a frequency control signal based on the frequency control word signal.
In an alternative example, continuing to refer to fig. 2, the frequency selection control circuit 10 may further include: the linear resistance control circuit 103, the linear resistance control circuit 103 is connected with the frequency control word signal generating module 101; the low dropout regulator 104 and the low dropout regulator (LDO) 104 are connected to the frequency control word signal generating module 101.
Specifically, the frequency control word signal generating module 101 makes a group of maping for the actually used resonant frequency and the control word, each frequency corresponds to one control word, and the control word of each frequency is set according to the fast start circuit 20. The frequency control word signal is applied to the level conversion circuit 102, the linear resistance control circuit 103, and the low dropout regulator 104, respectively.
In one example, the level shift circuit 102 is also coupled to an enable control signal, as shown in FIG. 2. The level shifter circuit 102 converts the start control signal into a frequency control signal having a waveform with adjustable amplitude, rising edge time and falling edge time, and the frequency control signal is used as a control voltage in the fast start circuit 20.
In an alternative example, the fast start circuit 20 may include a Voltage Controlled Oscillator (VCO), and in particular, the fast start circuit 20 may be a voltage controlled oscillator with a very low Q value.
In an alternative example, referring to fig. 3, the fast start circuit 20 may include: the processing modules 201 are sequentially connected in series in N stages, wherein N is more than or equal to 3; each processing module 201 may include a first input terminal, a second input terminal, a ground terminal, and an output terminal; the first end of each processing module 201 is connected with the frequency selection control circuit 10; the second input end of the first-stage processing module 201 is connected with the output end of the nth-stage processing module 201, and the second input ends of the other stages of processing modules 201 are connected with the output end of the previous-stage processing module 201; the grounding ends of the processing modules 201 at all levels are grounded; and a differential Buffer (Diff Buffer) 202, wherein an input end of the differential Buffer 202 is connected with an output end of the nth stage processing module 201, and an output end of the differential Buffer 202 is connected with the digitally controlled crystal oscillator 30.
In an alternative example, continuing to refer to fig. 3, each stage of processing modules may include: the inverter 2011 includes a control terminal, an input terminal, a ground terminal and an output terminal, the input terminal of the inverter 2011 is the second input terminal of the processing module 201, and the output terminal of the inverter 2011 is the output terminal of the processing module 201; a first voltage-current conversion module 2012, an input end of the first voltage-current conversion module 2012 is connected to an output end of the frequency selection control circuit 10, and an output end of the first voltage-current conversion module 2012 is connected to a control end of the inverter 2011; a first linear resistor 2013, wherein one end of the first linear resistor 2013 is connected with the output end of the frequency selection control circuit 10, and the other end is connected with the control end of the inverter 2011; the input end of the second voltage-current conversion module 2014 is connected to the ground end of the inverter 2011, and the output end of the second voltage-current conversion module 2014 is grounded; a second linear resistor 2015, one end of which is connected to the ground terminal of the inverter 2011 and the other end is grounded; the upper plate of the capacitor 2016 is connected to the output terminal of the inverter 2011, and the lower plate of the capacitor 2016 is grounded.
It should be noted that the fast start circuit 20 in fig. 3 is exemplified by a single-ended-cycle voltage-controlled oscillator of an inverter type.
Specifically, the frequency and the voltage-controlled gain (Kvco) of the fast start circuit 20 are mainly controlled by the voltage of the frequency control signal, the first voltage-to-current conversion module 2012, the second voltage-to-current conversion module 2014, the first linear resistor 2013 and the second linear resistor 2014. When the load capacitance is determined, the frequency of the fast start circuit 20 is determined by the voltage of the frequency control signal and the branch current of the inverter 2011 in each stage of the processing module 201.
As an example, the purpose of the first controllable linear resistor 2013 and the second controllable linear resistor 2015 is to control the frequency of the fast start circuit 20 at the limit control voltage, so that the voltage-controlled gain is controllable at the limit control voltage.
In an alternative example, with continued reference to fig. 3, the fast start circuit 20 includes a first output terminal and a second output terminal; digitally controlled crystal oscillator 30 may include: the negative resistance device can comprise a first end and a second end which are opposite, the first end of the negative resistance device is connected with the first end of the quick start circuit 20, and the second end of the negative resistance device is connected with the second end of the quick start circuit 20; and the quartz crystal resonator 302, wherein the quartz crystal resonator 302 is connected with the negative resistance device in parallel. Namely, the waveform signal output by the fast start circuit 20 is provided to two injection ends of the digital controlled crystal oscillator 30, since the frequency component of the waveform signal includes the target resonant frequency, the energy of the whole digital controlled crystal oscillator will increase instantly and resonate, after a period of time, the fast start circuit 20 can be closed, and the digital controlled crystal oscillator 30 will start oscillation on the target resonant frequency by using the initial energy until stable oscillation occurs.
Specifically, as shown in fig. 3, the negative resistance device may include: an input end of the adjustable phase inverter 3011 is connected to a first output end of the fast start circuit 20, and an output end of the adjustable phase inverter 3011 is connected to a second output end of the fast start circuit 20; and one end of the first adjustable resistor 3012 is connected to a first output end of the fast start circuit 20, and the other end of the first adjustable resistor 3012 is connected to a second output end of the fast start circuit 20.
In an alternative example, continuing to refer to fig. 3, digitally controlled crystal oscillator 30 may further include: a first node 303, wherein the first node 303 is connected with one end of the quartz crystal resonator 302; a second node 304, wherein the second node 304 is connected with the other end of the quartz crystal resonator 302; a first tunable capacitor 305, an upper electrode of the first tunable capacitor 305 is connected to the first node 303 and the input end of the tunable inverter 3011, and a lower electrode of the first tunable capacitor 305 is grounded; a second tunable capacitor 306, an upper electrode of the second tunable capacitor 306 being connected to the second node 304, and a lower electrode of the second tunable capacitor 306 being grounded; and a second adjustable resistor 307, wherein one end of the second adjustable resistor 307 is connected to the output end of the adjustable inverter 3011, and the other end is connected to the upper plate of the second adjustable capacitor 306 and the second node 304.
In an alternative example, continuing to refer to fig. 3, digitally controlled crystal oscillator 30 may further include: an electrostatic discharge (ESD) module 308, one end of the ESD module 308 is connected to the first node 303, and the other end is connected to the input end of the adjustable inverter 3011 and the upper plate of the first adjustable capacitor 305.
The utility model provides a quick starting circuit of numerical control crystal oscillator can control the injection frequency and improve Kvco, improves quick starting circuit 20's frequency-selective characteristic, and then provides bigger initial energy for numerical control crystal oscillator to compatible many resonant frequency.
The starting mechanism of the oscillator is to continuously amplify the noise in the circuit until the noise is stabilized by the nonlinearity of the oscillator, the initial energy provided by the fast start circuit 20 of the present application is equivalent to the noise to be amplified, and the larger the initial noise is, the faster the initial noise is, the more the noise is stabilized. The start-up time of the digitally controlled crystal oscillator 30 is mainly determined by the quartz crystal resonator 302, the load capacitance (the first tunable capacitor 305 and the second tunable capacitor 306 in fig. 3), the negative resistance of the negative resistance device, and the initial energy thereof, and the fact proves that the improvement of the initial energy on the start-up time is very obvious, and the injection closer to the target resonant frequency, the larger the initial energy can be obtained, and the start-up is faster.
The numerical control oscillation quick start circuit of the application obtains a proper Kvco by configuring the control voltage, the first linear resistor 2013 and the second linear resistor 2015, and adjusts the amplitude of the control voltage, so that the frequency of a signal generated by the starting start circuit 20 contains a target frequency and has small fluctuation nearby, which is equivalent to improving the Q value of the quick start circuit 20. This is done for each frequency and masping with the control word that starts up very quickly for different resonant frequencies.
In the description of the present specification, various technical features of the embodiments may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features of the embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A digitally controlled crystal oscillator fast start-up circuit, comprising:
a frequency selection control circuit for generating a frequency control signal based on the frequency selection signal;
the quick starting circuit is connected with the frequency selection control circuit and used for generating a waveform signal based on the frequency control signal, and the frequency component of the waveform signal comprises a target resonant frequency;
and the numerical control crystal oscillator is connected with the quick starting circuit and is used for generating resonance under the action of the waveform signal and starting oscillation on the target resonance frequency until stable oscillation is realized.
2. The digitally controlled crystal oscillator fast start circuit of claim 1, wherein said frequency selective control circuit comprises:
a frequency control word signal generating module, connected to the frequency selection signal, for generating a frequency control word signal, where the frequency control word signal includes a plurality of required resonant frequencies and control words corresponding to the resonant frequencies;
and the level conversion circuit is connected with the frequency control word signal generation module and is used for generating the frequency control signal based on the frequency control word signal.
3. The digitally controlled crystal oscillator fast start-up circuit of claim 2, wherein said frequency selective control circuit further comprises:
the linear resistance control circuit is connected with the frequency control word signal generation module;
and the low dropout linear regulator is connected with the frequency control word signal generation module.
4. The digitally controlled crystal oscillator fast start circuit of claim 1, wherein said fast start circuit comprises a voltage controlled oscillator.
5. The digitally controlled crystal oscillator fast start circuit of claim 4, wherein said fast start circuit comprises:
n stages of processing modules are sequentially connected in series, wherein N is more than or equal to 3; each processing module comprises a first input end, a second input end, a grounding end and an output end; the first end of each processing module is connected with the frequency selection control circuit; the second input end of the first-stage processing module is connected with the output end of the Nth-stage processing module, and the second input ends of the other stages of processing modules are connected with the output end of the previous-stage processing module; the grounding ends of the processing modules at all levels are grounded;
and the input end of the differential buffer is connected with the output end of the Nth-stage processing module, and the output end of the differential buffer is connected with the numerical control crystal oscillator.
6. The digitally controlled crystal oscillator fast start-up circuit of claim 5, wherein each stage of said processing modules comprises:
the phase inverter comprises a control end, an input end, a grounding end and an output end, wherein the input end of the phase inverter is the second input end of the processing module, and the output end of the phase inverter is the output end of the processing module;
the input end of the first voltage-current conversion module is connected with the output end of the frequency selection control circuit, and the output end of the first voltage-current conversion module is connected with the control end of the phase inverter;
one end of the first linear resistor is connected with the output end of the frequency selection control circuit, and the other end of the first linear resistor is connected with the control end of the phase inverter;
the input end of the second voltage-current conversion module is connected with the grounding end of the phase inverter, and the output end of the second voltage-current conversion module is grounded;
one end of the second linear resistor is connected with the grounding end of the phase inverter, and the other end of the second linear resistor is grounded;
and the upper polar plate of the capacitor is connected with the output end of the phase inverter, and the lower polar plate of the capacitor is grounded.
7. The digitally controlled crystal oscillator fast start-up circuit of claim 1, wherein the fast start-up circuit comprises a first output terminal and a second output terminal; the digitally controlled crystal oscillator includes:
the negative resistance device comprises a first end and a second end which are opposite, the first end of the negative resistance device is connected with the first end of the quick start circuit, and the second end of the negative resistance device is connected with the second end of the quick start circuit;
and the quartz crystal resonator is connected with the negative resistance device in parallel.
8. The digitally controlled crystal oscillator fast start-up circuit of claim 7, wherein said negative resistance device comprises:
the input end of the adjustable phase inverter is connected with the first output end of the quick starting circuit, and the output end of the adjustable phase inverter is connected with the second output end of the quick starting circuit;
and one end of the first adjustable resistor is connected with the first output end of the quick starting circuit, and the other end of the first adjustable resistor is connected with the second output end of the quick starting circuit.
9. The digitally controlled crystal oscillator fast start circuit of claim 8, further comprising:
the first node is connected with one end of the quartz crystal resonator;
the second node is connected with the other end of the quartz crystal resonator;
the upper electrode of the first adjustable capacitor is connected with the first node and the input end of the adjustable phase inverter, and the lower electrode of the first adjustable capacitor is grounded;
an upper electrode of the second tunable capacitor is connected to the second node, and a lower electrode of the second tunable capacitor is grounded;
and one end of the second adjustable resistor is connected with the output end of the adjustable phase inverter, and the other end of the second adjustable resistor is connected with the upper polar plate of the second adjustable capacitor and the second node.
10. The digitally controlled crystal oscillator fast start circuit of claim 9, further comprising:
and one end of the electrostatic discharge module is connected with the first node, and the other end of the electrostatic discharge module is connected with the input end of the adjustable phase inverter and the upper polar plate of the first adjustable capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211127382.5A CN115483924A (en) | 2022-09-16 | 2022-09-16 | Quick start circuit of numerical control crystal oscillator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211127382.5A CN115483924A (en) | 2022-09-16 | 2022-09-16 | Quick start circuit of numerical control crystal oscillator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115483924A true CN115483924A (en) | 2022-12-16 |
Family
ID=84423909
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211127382.5A Pending CN115483924A (en) | 2022-09-16 | 2022-09-16 | Quick start circuit of numerical control crystal oscillator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115483924A (en) |
-
2022
- 2022-09-16 CN CN202211127382.5A patent/CN115483924A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| TWI388128B (en) | Frequency controller for a monolithic clock generator and timing/frequency reference | |
| EP2520022B1 (en) | Temperature-stable oscillator circuit having frequency-to-current feedback | |
| US6094103A (en) | Multiple feedback loop ring oscillator and delay cell | |
| US7400183B1 (en) | Voltage controlled oscillator delay cell and method | |
| KR101126093B1 (en) | Monolithic clock generator and timing/frequency reference | |
| TWI426701B (en) | Inductor and capacitor-based clock generator and timing/frequency reference | |
| US6400231B1 (en) | Numerically controlled variable oscillator | |
| CN100581056C (en) | Stable oscillator without influence of temperature variation and power supply voltage variation | |
| US7268635B2 (en) | Circuits for voltage-controlled ring oscillators and method of generating a periodic signal | |
| US20070085620A1 (en) | Semiconductor integrated circuit device | |
| EP1791252A1 (en) | Oscillator comprising a startup control device | |
| CN101127525A (en) | A deviation setting circuit and voltage controlled oscillator | |
| CN111756371A (en) | Temperature compensation method, auxiliary circuit and voltage-controlled oscillation device | |
| KR100224310B1 (en) | Cmos voltage controll oscillator | |
| US7667550B2 (en) | Differential oscillator device with pulsed power supply, and related driving method | |
| US20040246040A1 (en) | Switched capacitor circuit capable of minimizing clock feedthrough effect in a voltage controlled oscillator circuit | |
| US5994968A (en) | VCO having a low sensitivity to noise on the power supply | |
| CN115483924A (en) | Quick start circuit of numerical control crystal oscillator | |
| US7834709B2 (en) | Circuit for voltage controlled oscillator | |
| US8081040B1 (en) | Method and apparatus for oscillating | |
| CN110572151B (en) | Phase-locked loop circuit | |
| US4816778A (en) | Inductorless MMIC oscillator | |
| CN111510114A (en) | Clock generator circuit | |
| KR100988170B1 (en) | Voltage controlled oscillator having low noise current source and voltage source | |
| JP2003069342A (en) | Temperature compensated crystal oscillator |
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 |