CN113114234B - Voltage controlled oscillator and phase locked loop circuit - Google Patents

Voltage controlled oscillator and phase locked loop circuit Download PDF

Info

Publication number
CN113114234B
CN113114234B CN202110344414.6A CN202110344414A CN113114234B CN 113114234 B CN113114234 B CN 113114234B CN 202110344414 A CN202110344414 A CN 202110344414A CN 113114234 B CN113114234 B CN 113114234B
Authority
CN
China
Prior art keywords
voltage
frequency
controlled oscillator
frequency modulation
output
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.)
Active
Application number
CN202110344414.6A
Other languages
Chinese (zh)
Other versions
CN113114234A (en
Inventor
尚晓宇
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fibocom Wireless Inc
Original Assignee
Fibocom Wireless Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fibocom Wireless Inc filed Critical Fibocom Wireless Inc
Priority to CN202110344414.6A priority Critical patent/CN113114234B/en
Publication of CN113114234A publication Critical patent/CN113114234A/en
Application granted granted Critical
Publication of CN113114234B publication Critical patent/CN113114234B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/08—Details of the phase-locked loop
    • H03L7/099—Details of the phase-locked loop concerning mainly the controlled oscillator of the loop
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
    • H03L7/18—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Landscapes

  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

The invention relates to a voltage-controlled oscillator and a phase-locked loop circuit. The voltage controlled oscillator includes: frequency modulation module and gating module. The phase-locked loop circuit includes the voltage-controlled oscillator. The frequency modulation module of the voltage-controlled oscillator comprises at least one frequency modulation channel, and as each frequency modulation channel has different working frequencies, at least one target frequency modulation channel is selectively conducted according to the control signal, and the target frequency modulation channels are connected in parallel, so that the working frequency of the voltage-controlled oscillator is adjusted. And then, according to the voltage error signal, outputting a corresponding frequency signal, thereby realizing the generation of different frequency band ranges.

Description

Voltage controlled oscillator and phase locked loop circuit
Technical Field
The invention relates to the technical field of communication, in particular to a voltage-controlled oscillator and a phase-locked loop circuit.
Background
The main parts of the phase-locked loop circuit comprise a phase discriminator, a loop filter and a voltage-controlled oscillator, and the current common phase-locked loop circuit uses one voltage-controlled oscillator to generate and lock a frequency range.
Disclosure of Invention
Based on this, there is a need to provide a voltage controlled oscillator that can generate different frequency ranges.
In a first aspect, a voltage controlled oscillator is provided, including:
the frequency modulation module comprises at least one frequency modulation channel, and each frequency modulation channel comprises capacitors with different capacitance values and/or different quantities so as to enable each frequency modulation channel to have different working frequencies;
the output end of the gating module is connected with the frequency modulation module, the first end of the gating module is used for receiving a control signal, the second end of the gating module is used for receiving a voltage error signal, and the gating module is used for selectively conducting at least one target frequency modulation channel according to the control signal;
the voltage-controlled oscillator is used for outputting a target frequency signal corresponding to the voltage error signal and the control signal.
In one embodiment, the gating module comprises:
the input end of the control unit is used for receiving the control signal, and the control unit is used for outputting a target output signal corresponding to the target output signal according to the control signal;
a first switching unit including:
the first ends of the first switch units are correspondingly connected with the frequency modulation channels;
at least one second terminal for receiving the voltage error signal;
the control ends of the first switch units are connected with the output end of the control unit and used for receiving the target output signal and selectively conducting the second ends of the first switch units and the target first ends.
In one embodiment, the first switch unit includes at least one single-pole multi-throw switch, the first end of the first switch unit is a fixed end of the single-pole multi-throw switch, the second end of the switch unit is a movable end of the single-pole multi-throw switch, and the control end of the first switch unit is a control end of the single-pole multi-throw switch.
In one embodiment, each frequency modulation channel further comprises: a capacitance and/or an inductance in series with the capacitor.
In one embodiment, the capacitor comprises a varactor.
In a second aspect, a phase-locked loop circuit is provided, including: a phase detector, a loop filter and a voltage controlled oscillator according to any of the above first aspect, wherein an input terminal of the phase detector is connected to an output terminal of the voltage controlled oscillator, an output terminal of the phase detector is connected to an input terminal of the loop filter, an output terminal of the loop filter is connected to an input terminal of the voltage controlled oscillator, wherein,
the phase discriminator is used for outputting a pulse error signal corresponding to the frequency difference according to the frequency difference between the reference signal and the output signal of the voltage-controlled oscillator;
the loop filter is used for outputting the voltage error signal corresponding to the pulse error signal according to the pulse signal.
In one embodiment, the phase-locked loop circuit further includes:
and the output end of the preset voltage circuit is connected with the input end of the loop filter, and the preset voltage circuit is used for outputting a target preset voltage corresponding to the preset frequency to the input end of the loop filter according to the preset frequency.
In one embodiment, the preset voltage circuit includes:
the output end of the main control unit is connected with the input end of the loop filter, and the main control unit is used for positioning the first voltage corresponding to the preset frequency according to the mapping relation between the first frequency and the first voltage and outputting the first voltage to the input end of the loop filter.
In one embodiment, the master control unit is further configured to:
and under the condition that the phase-locked loop circuit is open, applying a first voltage to each frequency modulation channel, acquiring a coordinate curve of the first voltage and a first frequency, and obtaining the mapping relation according to the coordinate curve of the first voltage and the first frequency, wherein the first frequency is an average value of the oscillation frequency of each frequency modulation channel at the first voltage.
In one embodiment, the threshold voltage circuit further comprises:
the input end of the analog-to-digital converter is connected with the output end of the loop filter, and the output end of the analog-to-digital converter is connected with the input end of the main control unit;
the input end of the digital converter is connected with the output end of the main control unit;
and the input end of the same-direction amplifier is connected with the output end of the digital-to-analog converter, and the output end of the same-direction amplifier is connected with the input end of the loop filter.
In one embodiment, the loop filter comprises:
at least one low pass filter, each corresponding to a different loop bandwidth;
and the second switching unit is used for selectively conducting the phase discriminator, the target low-pass filter and the voltage-controlled oscillator according to the index signal.
In a third aspect, there is provided a communication device comprising a voltage controlled oscillator as defined in any one of the first aspect or a phase locked loop circuit as defined in any one of the second aspect.
The frequency modulation module of the voltage-controlled oscillator comprises at least one frequency modulation channel, and as each frequency modulation channel has different working frequencies, at least one target frequency modulation channel is selectively conducted according to the control signal, and the target frequency modulation channels are connected in parallel, so that the working frequency of the voltage-controlled oscillator is adjusted. And outputting corresponding frequency signals according to the voltage error signals, thereby realizing the generation of different frequency range.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a voltage-controlled oscillator according to an embodiment;
FIG. 2 is a schematic diagram of a frequency modulation module of FIG. 1;
FIG. 3 is a schematic diagram of a structure of the gating module shown in FIG. 1;
FIG. 4 is a diagram illustrating an exemplary phase-locked loop circuit;
FIG. 5 is a schematic diagram of the loop filter of FIG. 4;
FIG. 6 is a diagram illustrating an exemplary preset voltage circuit;
fig. 7 is a schematic structural diagram of a phase-locked loop circuit according to another embodiment.
Description of reference numerals:
100-voltage controlled oscillator, 110-frequency modulation module, 112-frequency modulation path, 114-capacitor, 120-gating module, 310-first switch unit, 312-first end of first switch unit, 314-second end of first switch unit, 316-control end of first switch unit, 320-control unit, 400-phase-locked loop circuit, 410-phase detector, 420-loop filter, 510-low-pass filter, 520-second switch unit, 522-first end of second switch unit, 524-second end of second switch unit, 526-control end of second switch unit, 602-analog-digital converter, 604-main control unit, 606-digital-analog converter, 608-syntropy amplifier, 702-first frequency divider, 704-second frequency divider.
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 in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that, as used herein, the terms "first," "second," 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 resistance may be referred to as a second resistance, and similarly, a second resistance may be referred to as a first resistance, without departing from the scope of the present application. The first resistance and the second resistance are both resistances, but they are not the same resistance.
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.
As described in the background, a phase-locked loop circuit mainly includes three major parts, which are a phase detector, a loop filter and a voltage-controlled oscillator, respectively. If a phase-locked loop circuit is required to generate and lock a plurality of frequency ranges, a plurality of voltage-controlled oscillators and corresponding loop filters are generally required, so that the phase-locked loop circuit occupies a large space and is expensive to manufacture.
In view of the above, embodiments of the present application provide a voltage controlled oscillator to solve the above problems. Referring to fig. 1, a schematic structural diagram of a voltage controlled oscillator 100 provided in an embodiment of the present application is shown. As shown in fig. 1, the voltage controlled oscillator 100 may include a frequency modulation module 110 and a gating module 120.
Specifically, the frequency modulation module 110 includes at least one frequency modulation channel 112. In particular, each chirp path 112 may include a different capacitance value of capacitor 114, or each chirp path 112 may include a different number of capacitors 114, or each chirp path 112 may include a different capacitance value and a different number of capacitors 114, such that each chirp path 112 has a different operating frequency.
It should be noted that the number of frequency modulation channels of the voltage-controlled oscillator can be freely set according to the requirement, for example, the number of frequency band ranges to be generated can be set according to the requirement. The number of frequency modulation channels is not limited in the embodiment of the application. Optionally, the voltage controlled oscillator may include 4 frequency modulation channels.
Alternatively, the capacitors in each frequency modulation path may be connected in series. Alternatively, the capacitors in each frequency modulation path may be connected in parallel. Alternatively, some of the capacitors in each frequency modulation path may be connected in series, and the remaining ones may be connected in parallel. Optionally, the capacitance values of the capacitors of the frequency modulation path are the same. Optionally, the capacitance values of the capacitors of the frequency modulation path are different.
In an alternative embodiment of the present application, the voltage-controlled oscillator includes 4 frequency modulation paths (a first frequency modulation path, a second frequency modulation path, a third frequency modulation path, and a fourth frequency modulation path), and the first frequency modulation path may include 1 capacitor; the second frequency modulation path may comprise 2 capacitors, said 2 capacitors being connected in parallel; the third frequency modulation path may comprise 3 capacitors, said 3 capacitors being connected in series; the fourth frequency-modulated path may comprise 4 capacitors, said 4 capacitors being connected in series.
It will be appreciated that the frequency-modulated channels may take other forms, not limited to those mentioned in the above embodiments, as long as they enable different frequency-modulated channels 112 to have different operating frequencies.
Specifically, the output end of the gating module 120 is connected to the frequency modulation module 110, the first end of the gating module 120 is configured to receive the control signal, and the second end of the gating module 120 is configured to receive the voltage error signal. Specifically, the gating module 120 is configured to selectively turn on at least one target fm channel according to the control signal.
It should be noted that the control signal carries information of a required frequency range, the gating module 120 selectively turns on at least one target frequency modulation path according to the control signal, and since each frequency modulation path has a different operating frequency, the voltage-controlled oscillator can generate a frequency range with at least the same number as the frequency modulation paths according to the voltage error signal.
Specifically, the target frequency modulation paths are connected in parallel, and the voltage controlled oscillator 100 is configured to output a target frequency signal corresponding to the voltage error signal and the control signal.
Furthermore, when the gating module switches on two or more frequency modulation paths, namely two or more target frequency modulation paths are provided, because the target frequency modulation paths are connected in parallel, at the moment, the frequency modulation module can generate different working frequencies from a single target frequency modulation path, so that the voltage-controlled oscillator can generate different frequency range according to the voltage error signal, the number of the frequency range generated by the voltage-controlled oscillator is increased under the condition that a capacitor of the frequency modulation path is not increased, the preparation cost of the voltage-controlled oscillator is saved, and the practicability of the voltage-controlled oscillator is improved.
The frequency modulation module of the voltage-controlled oscillator provided by the embodiment of the application comprises at least one frequency modulation channel, and as each frequency modulation channel has different working frequencies, at least one target frequency modulation channel is selectively conducted according to a control signal, and the target frequency modulation channels are connected in parallel, so that the working frequency of the voltage-controlled oscillator is adjusted. And then, according to the voltage error signal, outputting a corresponding frequency signal, thereby realizing the generation of different frequency band ranges.
Referring to fig. 2, a schematic diagram of a frequency modulation module 110 in a voltage controlled oscillator according to an embodiment of the present disclosure is shown. As shown in fig. 2, the capacitor of the frequency modulation module 110 may include a varactor diode (D) 11 、D 21 、D 22 、D 31 、D 32 、D 33 、D 41 、D 42 、D 43 And D 44 )。
Optionally, each frequency modulation path may include at least one varactor. Specifically, the positive electrode of the variable capacitance diode of each frequency modulation channel is connected with the output end of the gating module, and the negative electrode of the variable capacitance diode is connected with the output end of the voltage-controlled oscillator. Optionally, the cathode of the varactor may also be connected to ground.
In an alternative embodiment of the present application, as shown in fig. 2, the voltage controlled oscillator comprises 4 frequency modulated channels (L) 1 、L 2 、L 3 And L 4 ) Frequency-modulated path L 1 Comprising 1 varactor diode (D) 11 ) (ii) a Frequency modulation path L 2 Comprising 2 varactors (D) 21 And D 22 )，D 21 、D 22 Are connected in series; frequency modulation path L 3 Comprising 3 varactors (D) 31 、D 32 And D 33 )，D 31 、D 32 、D 33 Are connected in series; frequency modulation path L 4 Comprising 4 varactors (D) 41 、D 42 、D 43 And D 44 )，D 41 、D 42 、D 43 And D 44 Connected in series, D 44 The negative electrode of the switch is connected with the grounding terminal.
Optionally, each frequency modulation path provided in the above embodiments may further include a capacitor. Specifically, the capacitor and the capacitor are connected in series. Optionally, the capacitance of each frequency modulation path in the above embodiments may be replaced by an inductance. Optionally, each frequency modulation path provided by the above embodiment may further include a capacitor and an inductor at the same time. The number and the size of the capacitance value of the capacitor and the inductor of each frequency modulation path are not limited, and the debugging difficulty can be reduced by adding the capacitor and/or the inductor which are connected with the capacitor in series in each frequency modulation path.
The above embodiments provide alternative configurations of the fm module and fm path, then the following embodiments will provide alternative configurations of the gating module.
Please refer to fig. 3, which illustrates a schematic structural diagram of the gating module 120 according to an embodiment of the present application. As shown in fig. 3, the gating module 120 may include a first switching unit 310 and a control unit 320.
Specifically, the first switch unit 310 includes a first terminal 312, a second terminal 314, and a control terminal 316. Specifically, the first ends 312 of the first switch units are matched with the number of the frequency modulation paths, that is, the number 312 of the first ends of the first switch units is the same as the number of the frequency modulation paths, and the first ends 312 of the first switch units are correspondingly connected with the frequency modulation paths. The number of the second terminals 314 of the first switch units is greater than or equal to 1, and the second terminals 314 of the first switch units are used for receiving the voltage error signals. The number of the control terminals 316 of the first switch unit is matched with the number of the second terminals 314 of the first switch unit, that is, the number of the control terminals 316 of the first switch unit is the same as that of the second terminals 314 of the first switch unit, and the control terminal 316 of the first switch unit is connected to the output terminal of the control unit 320, and is configured to receive a target output signal corresponding to the control signal output by the control unit 320, and selectively turn on the second terminal 314 of the first switch unit and the target first terminal.
It should be noted that the first switch unit 310 may include a plurality of second terminals 314, the number of the control terminals 316 of the first switch unit is the same as that of the second terminals 314 of the first switch unit, the control unit 320 may output the target output signals that are the same as that of the second terminals 314 of the first switch unit, and the control terminals 316 of the first switch unit, the second terminals 314 of the first switch unit, and the control signals output by the control unit 320 have a mapping relationship, that is, the control terminal 316 of the first switch unit receives the control signals corresponding to the control terminals 316 of the first switch unit and the control signals output by the control unit 320, controls the second terminal 314 of the first switch unit corresponding to the control terminal 316 of the first switch unit, connects the second terminal 314 of the first switch unit to a target first terminal, the target first terminal is connected to a target frequency modulation path, outputs the voltage error signal received by the second terminal 314 of the first switch unit to the target frequency modulation path, and enables the voltage controlled oscillator to output the frequency signal corresponding to the control signal and the voltage error signal.
In an alternative embodiment of the present application, the first switch unit may include at least one single-pole multi-throw switch. Specifically, the fixed end of the single-pole multi-throw switch is connected with the frequency modulation path, the moving end of the single-pole multi-throw switch is used for receiving the voltage error signal, the control end of the single-pole multi-throw switch is connected with the output end of the control unit and used for receiving the target output signal corresponding to the control signal, and the moving end and the fixed end corresponding to the target output signal are selectively conducted, so that the voltage error signal received by the moving end of the single-pole multi-throw switch can be transmitted to the target frequency modulation path, and the voltage-controlled oscillator outputs the corresponding frequency signal.
It should be noted that, the embodiments of the present application do not limit the number and types of the single-pole multi-throw switches, as long as the gating function of the gating module can be achieved. Optionally, the number of the single-pole multi-throw switches is the same as the number of the first ends of the first switch unit, and the number of the total stationary ends of the single-pole multi-throw switches, which is the same as the number of the first ends of the first switch unit, is the same as the frequency modulation number of the frequency modulation module, which is described in the following embodiments. In an alternative embodiment of the present application, the fm module has 4 fm channels. Optionally, first
The switching unit may comprise two single pole double throw switches or the first switching unit may comprise one single pole four throw switch, i.e. in the above described embodiment with 4 stationary terminals, the same number as the frequency modulated paths. In the case that the first switch unit includes a single-pole four-throw switch, the control unit may include two GPIO ports, and the control unit may output 00, 01, 10, or 11 according to different control signals, so that the single-pole four-throw switch may input the voltage error signal to the target frequency modulation path, and the voltage-controlled oscillator may output a frequency signal corresponding to the control signal and the voltage error signal.
Referring to fig. 4, a phase-locked loop circuit according to an embodiment of the present disclosure is shown. As shown in fig. 4, the phase locked conversion circuit 400 may include a phase detector 410, a loop filter 420, and a voltage controlled oscillator 100.
The description of the voltage-controlled oscillator 100 is detailed in the above embodiments and will not be repeated here.
Specifically, an input end of the phase detector 410 is connected to an output end of the voltage controlled oscillator 100, an output end of the phase detector 410 is connected to an input end of the loop filter 420, and an output end of the loop filter 420 is connected to an input end of the voltage controlled oscillator 100.
Specifically, the phase detector 410 is configured to output a pulse error signal corresponding to a difference between the frequencies according to a difference between the frequencies of the reference signal and the output signal of the voltage controlled oscillator 100.
Alternatively, the reference signal may be generated by a crystal oscillator. Optionally, the phase-locked loop circuit provided in the above embodiment may further include a first frequency divider and a second frequency divider. Specifically, the input end of the first frequency divider is used for inputting a reference signal, and the output end of the first frequency divider is connected with the first input end of the phase discriminator. Specifically, an input end of the second frequency divider is connected with an output end of the voltage-controlled oscillator, and an output end of the second frequency divider is connected with a second input end of the phase discriminator.
Specifically, the loop filter 420 is configured to output a voltage error signal corresponding to the pulse signal according to the pulse error signal.
The phase discriminator of the phase-locked loop circuit outputs a corresponding pulse error signal according to the frequency difference between the reference signal and the frequency signal of the output signal of the voltage-controlled oscillator, the loop filter outputs a voltage error signal corresponding to the pulse error signal according to the pulse error signal, and the voltage-controlled oscillator generates a frequency signal corresponding to the voltage error signal according to the voltage error signal so as to realize the frequency consistency between the frequency signal output by the voltage-controlled oscillator and the reference signal.
Furthermore, the frequency modulation module of the voltage-controlled oscillator comprises at least one frequency modulation channel, and as each frequency modulation channel has different working frequencies, at least one target frequency modulation channel is selectively conducted according to the control signal, and each target frequency modulation channel is connected in parallel, so that the working frequency of the voltage-controlled oscillator is adjusted. And then, according to the voltage error signal, outputting a corresponding frequency signal, thereby realizing the generation of different frequency band ranges.
Furthermore, the voltage-controlled oscillator provided in the above embodiment has at least one frequency modulation path, and the gating module selectively switches on the target frequency modulation path, so that multiple frequency band ranges can be generated without using multiple voltage-controlled oscillators, thereby reducing the occupied space of the phase-locked loop circuit and reducing the manufacturing cost of the phase-locked loop circuit.
The above embodiments provide a phase-locked loop circuit capable of generating and locking a plurality of different frequency range, and then the following embodiments provide a phase-locked loop circuit capable of meeting the index requirements of a plurality of different frequency range.
Referring to fig. 5, a schematic diagram of a loop filter 420 of a phase-locked loop circuit according to an embodiment of the present disclosure is shown. As shown in fig. 5, the loop filter 420 may include a low pass filter 510 and a second switching unit 520.
Specifically, the loop filter 420 includes at least one low pass filter 510, and each low pass filter 510 corresponds to a different loop bandwidth. It should be noted that the number of the low-pass filters 510 may be set according to requirements, and the number of the low-pass filters 510 is not limited in the embodiment of the present application. Optionally, the number of low-pass filters is the same as the number of frequency band ranges that the voltage controlled oscillator can generate.
Specifically, the second switching unit 520 is configured to selectively turn on the phase detector, the target low-pass filter, and the voltage-controlled oscillator according to the index signal. Alternatively, the second switching unit 520 may include: a first terminal 522 and a second terminal 524 and a control terminal 526 matching the number of low pass filters.
It should be noted that the index signal contains information of index requirements of different frequency bands. Specifically, the second switch unit 520 connects the output terminal of the phase detector to the input terminal of the target low-pass filter corresponding to the index requirement according to the index signal, and connects the output terminal of the target low-pass filter corresponding to the index requirement to the input terminal of the voltage-controlled oscillator.
Optionally, the input end of each low-pass filter is connected to the output end of the phase detector, the output end of each low-pass filter is correspondingly connected to the second end of the second switch unit, the first end of the second switch unit is connected to the second end of the gating module, the control end of the second switch unit is configured to receive the index signal, and selectively connect the first end of the second switch unit to the target second end of the second switch unit according to the index signal.
Optionally, the input end of each low-pass filter is correspondingly connected to the second end of each second switch unit, the first end of each second switch unit is connected to the output end of the phase detector, the control end of each second switch unit is configured to receive the index signal, and the output end of each low-pass filter is respectively connected to the second end of the gating module, and is configured to selectively connect the first end of each second switch unit to the target second end of the second switch unit according to the index signal.
The voltage-controlled oscillator provided by the embodiment can reduce the occupied space of the phase-locked loop circuit which generates and locks a plurality of frequency range ranges and reduce the preparation cost, and on the other hand, a plurality of loop filters are required to meet the index requirements of different frequency range ranges, which can cause the problem of longer locking time of some frequency ranges. Then, the following embodiments will provide a phase-locked loop circuit to solve the above-described problems.
In an optional embodiment of the present application, the phase-locked loop circuit provided in the foregoing embodiment may further include a preset voltage circuit. Specifically, the output terminal of the preset voltage circuit is connected to the input terminal of the loop filter. Specifically, the preset voltage circuit is configured to output a target preset voltage corresponding to the preset frequency to the input terminal of the loop filter according to the preset frequency. Optionally, the preset voltage circuit is configured to output a target preset voltage corresponding to the preset frequency to a large capacitor of the loop filter according to the preset frequency.
It should be noted that the preset frequency may be set as needed, and the embodiment of the present application does not limit the preset frequency. In the above embodiment, the preset voltage circuit applies the target preset voltage to the loop filter, thereby reducing the locking time of the phase-locked loop circuit.
Optionally, the preset voltage circuit provided in the above embodiment may include a main control unit. Specifically, the output end of the main control unit is connected with the input end of the loop filter. Specifically, the main control unit may position a first voltage corresponding to the preset frequency according to a mapping relationship between the first frequency and the first voltage, and output the first voltage to the input end of the loop filter.
Specifically, the main control unit may receive a preset frequency, determine a first voltage corresponding to the preset frequency according to a mapping relationship between the first frequency and the first voltage, use the first voltage corresponding to the preset frequency as a target first voltage, and output the target first voltage to the input end of the loop filter by the main control unit.
According to the above description of the embodiment, the main control unit needs to determine the target first voltage according to the mapping relationship between the first frequency and the first voltage. Then, the following embodiments will provide a master control unit that can acquire a mapping relationship of the first frequency and the first voltage.
Optionally, the main control unit in the foregoing embodiment may be further configured to: in the case that the phase-locked loop circuit of the above embodiment is open, the first voltage is applied to each frequency modulation path, a coordinate curve of the first voltage and the first frequency is obtained, and the mapping relationship between the first frequency and the first voltage is obtained according to the coordinate curve of the first voltage and the first frequency. It should be noted that the first frequency is an average value of oscillation frequencies of the frequency modulation channels at the first voltage.
Referring to fig. 6, a schematic diagram of a preset voltage circuit 600 of a phase-locked loop circuit according to an embodiment of the present disclosure is shown. As shown in fig. 6, the preset voltage circuit 600 may include: analog-to-digital converter 602, main control unit 604, digital-to-analog converter 606, and a syntropic amplifier 608.
Specifically, an input end of the analog-to-digital converter 602 is connected to an output end of the loop filter, an output end of the analog-to-digital converter 602 is connected to an input end of the main control unit 604, an output end of the main control unit 604 is connected to an input end of the digital-to-analog converter 606, an output end of the digital-to-analog converter 606 is connected to an input end of the homonymous amplifier 608, and an output end of the homonymous amplifier 608 is connected to an input end of the loop filter.
It can be understood that in the embodiment of the present application, the output signal of the loop filter is converted into a digital signal by the analog-to-digital converter 602, the main control unit 604 outputs a target first voltage corresponding to the digital signal according to the digital signal, and then the target first voltage is converted into an analog signal by the digital-to-analog converter 604, and the analog signal is processed by the homodyne amplifier 608 to output the target preset voltage to the input terminal of the loop filter, so as to reduce the lock time of the phase-locked loop circuit.
Fig. 7 is a schematic structural diagram of a phase-locked loop circuit according to an embodiment of the present disclosure. As shown in fig. 7, the phase-locked loop circuit 400 provided in the foregoing embodiment may further include: a first frequency divider 702, a second frequency divider 704, a phase detector 410, a loop filter 420, a voltage controlled oscillator 100, an analog-to-digital converter 602, a main control unit 604, a digital-to-analog converter 606, and a syntropic amplifier 608.
For the descriptions of the first frequency divider 702, the second frequency divider 704, the phase detector 410, the loop filter 420, the voltage controlled oscillator 100, the analog-to-digital converter 602, the main control unit 604, the digital-to-analog converter 606, and the equidirectional amplifier 608, the above embodiments are detailed and will not be described again here.
An alternative embodiment of the present application provides a communication device that may include a voltage controlled oscillator.
The detailed description of the voltage-controlled oscillator refers to the above embodiments, and is not repeated here.
An alternative embodiment of the present application provides a communication device that may include a phase-locked loop circuit.
The description of the phase-locked loop circuit is detailed in the above embodiments and will not be repeated here.
In the description herein, references to "some embodiments," "other embodiments," "desired embodiments," or the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, a schematic description of the above terminology may not necessarily refer to the same embodiment or example.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within 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 invention, and the description thereof is specific and detailed, but not to be understood as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent should be subject to the appended claims.

Claims (9)

1. A voltage controlled oscillator for use in a phase locked loop circuit, comprising:
the frequency modulation module comprises at least one frequency modulation channel, and each frequency modulation channel comprises capacitors with different capacitance values and/or different quantities, so that each frequency modulation channel has different working frequencies;
the output end of the gating module is connected with the frequency modulation module, the first end of the gating module is used for receiving a control signal, the second end of the gating module is used for receiving a voltage error signal, and the gating module is used for selectively conducting at least one target frequency modulation channel according to the control signal;
the voltage-controlled oscillator is used for outputting a target frequency signal corresponding to the voltage error signal and the control signal;
the phase-locked loop circuit comprises a phase detector, a loop filter, a voltage-controlled oscillator and a preset voltage circuit, wherein the preset voltage circuit comprises a main control unit, the main control unit is used for applying first voltage to each frequency modulation channel under the condition that the phase-locked loop circuit is open, obtaining a coordinate curve of the first voltage and first frequency, and obtaining a mapping relation according to the coordinate curve of the first voltage and the first frequency, wherein the first frequency is the average value of the oscillation frequency of each frequency modulation channel under the first voltage.
2. The voltage controlled oscillator of claim 1, wherein the gating module comprises:
the input end of the control unit is used for receiving the control signal, and the control unit is used for outputting a target output signal corresponding to the control signal according to the control signal;
a first switching unit including:
the first ends are matched with the frequency modulation channels in number, and the first end of each first switch unit is correspondingly connected with each frequency modulation channel;
at least one second terminal for receiving the voltage error signal;
and the control ends of the first switch units are connected with the output end of the control unit and used for receiving the target output signal and selectively conducting the second ends of the first switch units and the target first ends.
3. The vco of claim 2, wherein the first switch unit comprises at least one spdt switch, the first terminal of the first switch unit is a stationary terminal of the spdt switch, the second terminal of the first switch unit is a moving terminal of the spdt switch, and the control terminal of the first switch unit is a control terminal of the spdt switch.
4. The voltage controlled oscillator of claim 1, wherein each of the frequency modulation paths further comprises: a capacitance and/or an inductance in series with the capacitor.
5. The voltage controlled oscillator of any of claims 1-4, wherein the capacitor comprises a varactor.
6. The voltage controlled oscillator of any of claims 1-4, wherein an input of the phase detector is connected to an output of the voltage controlled oscillator, an output of the phase detector is connected to an input of the loop filter, an output of the loop filter is connected to an input of the voltage controlled oscillator, wherein,
the phase discriminator is used for outputting a pulse error signal corresponding to the frequency difference according to the frequency difference between the reference signal and the output signal of the voltage-controlled oscillator;
the loop filter is used for outputting the voltage error signal corresponding to the pulse error signal according to the pulse error signal.
7. The vco of claim 6, wherein the preset voltage circuit has an output connected to an input of the loop filter, and wherein the preset voltage circuit is configured to output a target preset voltage corresponding to a preset frequency to the input of the loop filter according to the preset frequency.
8. The vco of claim 7, wherein an output end of the main control unit is connected to an input end of the loop filter, and the main control unit is configured to locate the first voltage corresponding to the preset frequency according to a mapping relationship between the first frequency and the first voltage, and output the first voltage to the input end of the loop filter.
9. The voltage controlled oscillator of any one of claims 1-4, wherein the preset voltage circuit further comprises:
the input end of the analog-to-digital converter is connected with the output end of the loop filter, and the output end of the analog-to-digital converter is connected with the input end of the main control unit;
the input end of the digital-to-analog converter is connected with the output end of the main control unit;
and the input end of the same-direction amplifier is connected with the output end of the digital-to-analog converter, and the output end of the same-direction amplifier is connected with the input end of the loop filter.
CN202110344414.6A 2021-03-22 2021-03-22 Voltage controlled oscillator and phase locked loop circuit Active CN113114234B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110344414.6A CN113114234B (en) 2021-03-22 2021-03-22 Voltage controlled oscillator and phase locked loop circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110344414.6A CN113114234B (en) 2021-03-22 2021-03-22 Voltage controlled oscillator and phase locked loop circuit

Publications (2)

Publication Number Publication Date
CN113114234A CN113114234A (en) 2021-07-13
CN113114234B true CN113114234B (en) 2023-03-14

Family

ID=76713037

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110344414.6A Active CN113114234B (en) 2021-03-22 2021-03-22 Voltage controlled oscillator and phase locked loop circuit

Country Status (1)

Country Link
CN (1) CN113114234B (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101741379A (en) * 2009-12-09 2010-06-16 中国科学院半导体研究所 Frequency complex for fast locking phaselocked loop
CN106452433A (en) * 2016-11-17 2017-02-22 深圳市华讯方舟卫星通信有限公司 Frequency synthesizer
CN109088634A (en) * 2018-07-13 2018-12-25 东南大学 A kind of Low phase noise broadband microwave frequency source circuit

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100983077B1 (en) * 2008-11-07 2010-09-17 삼성전기주식회사 Wideband Voltage Controlled Oscillator and Wideband Oscillation Frequency Generation Method
CN106788404B (en) * 2016-11-15 2020-04-28 中国电子科技集团公司第四十一研究所 Automatic calibration circuit and method for phase-locked loop frequency synthesizer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101741379A (en) * 2009-12-09 2010-06-16 中国科学院半导体研究所 Frequency complex for fast locking phaselocked loop
CN106452433A (en) * 2016-11-17 2017-02-22 深圳市华讯方舟卫星通信有限公司 Frequency synthesizer
CN109088634A (en) * 2018-07-13 2018-12-25 东南大学 A kind of Low phase noise broadband microwave frequency source circuit

Also Published As

Publication number Publication date
CN113114234A (en) 2021-07-13

Similar Documents

Publication Publication Date Title
US6538521B2 (en) Voltage controlled oscillator
KR101841169B1 (en) Phase-locked loop having a multi-band oscillator and method for calibrating same
US4132950A (en) Clarifying radio receiver
US7180375B2 (en) PLL circuit
CA2879231C (en) Ultra low phase noise signal source
US8008979B2 (en) Frequency synthesizer and radio transmitting apparatus
WO1998036491A1 (en) Voltage controlled ring oscillator frequency multiplier
CN110289858B (en) Broadband fine stepping agile frequency conversion combination system
CN113114234B (en) Voltage controlled oscillator and phase locked loop circuit
CN105227183A (en) A kind of frequency agility rate source of low spurious
CN101459465A (en) Local oscillation device supporting multiple frequency band working mode
CN113225074A (en) Universal frequency modulator and frequency modulation method and device
US8995506B2 (en) Transceiver with sub-sampling based frequency synthesizer
US20240364265A1 (en) Frequency generator
CN103607173B (en) A kind of voltage controlled oscillator of variable voltage-controlled sensitivity
CN107968651B (en) Broadband signal generator
GB2504509A (en) Phase locked loop with reduced susceptibility to VCO frequency pulling
CN110995259B (en) Frequency synthesizer for handheld ultrashort wave frequency hopping radio station
CN212850458U (en) Broadband local oscillator circuit
CN110995255B (en) Broadband low-phase-noise phase-locked loop with quick locking function
US20020109555A1 (en) Voltage-controlled variable tuning circuit for switching an oscillation frequency band of a voltage controlled oscillator
CN111769830A (en) Broadband local oscillation circuit and local oscillation signal generating method
CN112087230A (en) Broadband linear frequency modulation signal generating device and method
WO2018198226A1 (en) Signal source
JP3556917B2 (en) Frequency synthesizer

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant