CN112152610A - Phase-locked loop with broadband rapid frequency hopping function - Google Patents
Phase-locked loop with broadband rapid frequency hopping function Download PDFInfo
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- 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
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- 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
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- 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
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- 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
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- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention provides a phase-locked loop with a broadband rapid frequency hopping function, which aims to solve the problem of long frequency hopping time. The device comprises an analog high-speed counting unit, a digital processing unit and a narrow-band voltage-controlled oscillation group; the narrow-band voltage-controlled oscillator group consists of a plurality of narrow-band voltage-controlled oscillators, and the narrow-band voltage-controlled oscillators output frequency signals; the analog high-speed counting unit is used for rapidly counting high-frequency signals in the frequency signals output by the narrow-band voltage-controlled oscillator, and counting pulses and counting values obtained after the high-frequency signals are counted are converted into low-frequency signals to be transmitted to the digital processing unit; and the digital processing unit is used for receiving the counting pulse and the counting value from the analog high-speed counting unit, calculating the frequency of the current narrow-band voltage-controlled oscillator by using the counting pulse and the counting value, and searching the narrow-band voltage-controlled oscillator outputting the target frequency and the frequency band of the narrow-band voltage-controlled oscillator. The invention can reduce the frequency hopping time of the phase-locked loop under the condition of not influencing the performance of the phase-locked loop.
Description
Technical Field
The invention relates to the technical field of phase-locked loops, in particular to a phase-locked loop with a broadband rapid frequency hopping function.
Background
The frequency source chip is the core device of the modern radio communication system, the quality of the output signal directly determines the quality of the system performance, and low phase noise, low spurious, fast frequency hopping and the like have become necessary requirements of the system. The phase-locked loop chip is one of important means for realizing a frequency source, and has the advantages of low phase noise and good spurious suppression characteristic.
However, in order to realize carrier frequency output in a wide frequency band range, a phase-locked loop chip usually adopts a plurality of narrow-band voltage-controlled oscillator groups to realize signal wide-band output in a combined manner, and each narrow-band voltage-controlled oscillator has the characteristics of low tuning voltage and narrow tuning voltage range, and each narrow-band voltage-controlled oscillator is composed of a plurality of frequency bands according to requirements. Therefore, when the output of the chip jumps from one frequency point to another frequency point, there is a requirement for the frequency hopping time.
However, at present, the fast frequency hopping implementation mode is often implemented by combining with the DDS, but this way undoubtedly increases the cost and greatly increases the power consumption. In addition, as shown in fig. 1, a conventional frequency hopping technology block diagram is shown, and a cost-saving implementation manner is to integrate a frequency hopping algorithm inside a phase-locked loop chip, but because of the limitation of the operating frequency of a digital circuit processing unit, the frequency of a narrow-band voltage-controlled oscillator group has to be reduced to a frequency that can be processed by a digital circuit, and finally, the frequency hopping time is long.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a phase-locked loop with a broadband rapid frequency hopping function, so as to solve the problem of long frequency hopping time.
The invention is realized by the following technical scheme:
a phase-locked loop with a broadband fast frequency hopping function comprises an analog high-speed counting unit, a digital processing unit and a narrow-band voltage-controlled oscillation group;
the narrow-band voltage-controlled oscillator group consists of a plurality of narrow-band voltage-controlled oscillators, and the narrow-band voltage-controlled oscillators output frequency signals;
the analog high-speed counting unit is used for rapidly counting high-frequency signals in the frequency signals output by the narrow-band voltage-controlled oscillator, and counting pulses and counting values obtained after the high-frequency signals are counted are converted into low-frequency signals to be transmitted to the digital processing unit;
and the digital processing unit is used for receiving the counting pulse and the counting value from the analog high-speed counting unit, calculating the frequency of the current narrow-band voltage-controlled oscillator by using the counting pulse and the counting value, and searching the narrow-band voltage-controlled oscillator outputting the target frequency and the frequency band of the narrow-band voltage-controlled oscillator.
Preferably, the device also comprises a phase discriminator unit, a charge pump unit, a loop low-pass filtering unit, a power amplifying unit and a loop N frequency dividing unit;
the phase discriminator unit is used for comparing the phases of the reference signal and the feedback signal output by the loop N frequency division unit after frequency division to form a phase difference signal;
the charge pump unit is used for converting the phase difference signal formed by the phase discriminator unit into a voltage signal;
the loop low-pass filtering unit is used for performing low-pass filtering on the phase difference signal processed by the charge pump unit and outputting control voltage;
the narrow band voltage controlled oscillator receives the control voltage from the loop low-pass filter unit and performs frequency control; outputting a feedback signal to a loop N frequency division unit;
the loop N frequency division unit is used for receiving a feedback signal of the narrow band voltage controlled oscillator, carrying out frequency division and transmitting the frequency division signal to the phase discriminator unit;
and the power amplifier unit is used for amplifying the power of the frequency signal output by the narrow band voltage controlled oscillator and then outputting the frequency signal.
Furthermore, the system also comprises a reference crystal oscillator and a reference frequency division unit;
the reference crystal oscillator 1 is used for generating a differential analog reference input signal and transmitting the differential analog reference input signal to the reference frequency division unit;
and the reference frequency division unit is used for converting the differential analog reference input signal into a digital working signal, dividing the frequency at the same time to generate a reference signal and transmitting the reference signal to the analog high-speed counting unit and the phase discriminator unit.
Furthermore, the reference frequency division unit, the phase discriminator unit, the charge pump unit, the power amplification unit, the loop N frequency division unit, the analog high-speed counting unit, the digital processing unit and the narrow-band voltage-controlled oscillation group are all integrated into a phase-locked loop chip.
Preferably, each narrow band voltage controlled oscillator comprises a plurality of frequency bands.
Preferably, the analog high-speed counting unit and the digital processing unit operate during frequency hopping, and the analog high-speed counting unit and the digital processing unit stop operating after the frequency hopping is completed.
Preferably, the analog high-speed counting unit is integrated into the phase-locked loop chip.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention provides a fast frequency hopping broadband phase-locked loop, which is researched aiming at the existing phase-locked loop frequency hopping technology, can accelerate the high-frequency signal counting of a narrow-band voltage-controlled oscillator by building an analog high-speed counting circuit under the condition of not influencing the performance of the phase-locked loop, and completes the processing of a low-frequency signal obtained after the high-frequency counting to a digital circuit, so that a proper narrow-band voltage-controlled oscillator is quickly selected from a plurality of narrow-band voltage-controlled oscillators, a target frequency band is selected from a plurality of frequency bands of the narrow-band voltage-controlled oscillator, and finally the frequency hopping time of the phase-locked. The phase-locked loop structure has the characteristics of ultra wide band and rapid frequency hopping, and is easy to realize the design of a miniaturized frequency source.
Furthermore, the analog high-speed counting unit only works during frequency hopping, and stops working once the frequency hopping is finished, so that the power consumption is saved.
Furthermore, the analog high-speed counting unit is integrated into the phase-locked loop chip, and compared with a mode of combining the phase-locked loop chip and the DDS chip, the analog high-speed counting device has the advantages of reducing system cost, reducing system volume and the like. Compared with a mode of only using a digital circuit for processing, the area of the phase-locked loop chip is increased by the analog high-speed counting unit, but the power consumption and the performance of the phase-locked loop chip under normal work are not influenced, and the performance of the broadband phase-locked loop for fast frequency hopping is improved.
Drawings
Fig. 1 is a block diagram of a conventional frequency hopping technique.
Fig. 2 is a schematic block diagram of a circuit according to an embodiment of the present invention.
Description of the drawings: the circuit comprises a reference crystal oscillator 1, a reference frequency division unit 2, a phase discriminator unit 3, a charge pump unit 4, a loop low-pass filter unit 5, a power amplification unit 6, a loop N frequency division unit 7, an analog high-speed counting unit 8, a digital processing unit 9 and a narrow-band voltage-controlled oscillator group 10.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
Referring to fig. 2, a phase-locked loop with a wideband fast frequency hopping function according to an embodiment of the present invention includes a reference frequency dividing unit 2, a phase discriminator unit 3, a charge pump unit 4, a loop low-pass filtering unit 5, a power amplifying unit 6, a loop N frequency dividing unit 7, an analog high-speed counting unit 8, a digital processing unit 9, and a narrowband voltage-controlled oscillation group 10.
Specifically, the output of the reference frequency dividing unit 2 is connected to the first input end of the phase detector unit 3, the output end of the phase detector unit 3 is connected to the input end of the charge pump unit 4, the output end of the charge pump unit 4 is connected to the input end of the loop low-pass filter unit 5, the output end of the loop low-pass filter unit 5 is connected to the first input end of the narrow-band voltage-controlled oscillator group 10, the output end of the narrow-band voltage-controlled oscillator group 10 is connected to the input end of the power amplifying unit 6, the output end of the narrow-band voltage-controlled oscillator group 10 is connected to the input end of the loop N frequency dividing unit 7, and the output end of the loop N frequency dividing unit 7 is connected to the second input end of the phase detector unit.
The output end of the narrow-band voltage-controlled oscillator group 10 is connected with the first input end of the analog high-speed counting unit 8, the output end of the reference frequency dividing unit 2 is connected with the second input end of the analog high-speed counting unit 8, the output end of the analog high-speed counting unit 8 is connected with the input end of the digital processing unit 9, and the output end of the digital processing unit 9 is connected with the second input end of the narrow-band voltage-controlled oscillator group 10, so that a rapid frequency hopping loop is formed.
And the reference frequency division unit converts the differential analog reference input signal into a digital working signal and simultaneously performs frequency division to generate a reference signal.
And the phase discriminator unit is used for comparing the phases of the reference signal generated by the reference frequency dividing unit and the feedback signal output by the loop N frequency dividing unit to form a phase difference signal.
And the charge pump unit is used for converting the phase difference signal formed by the phase discriminator unit into a voltage signal.
And the loop low-pass filtering unit is connected with the charge pump unit and is used for performing low-pass filtering on the phase difference signal.
And the loop N frequency division unit is used for receiving the feedback signal of the narrow band voltage controlled oscillator, carrying out frequency division and transmitting the frequency division signal to the phase discriminator unit.
And the power amplifier unit is used for amplifying the power of the frequency signal output by the narrow band voltage controlled oscillator and then outputting the frequency signal.
The narrow-band voltage-controlled oscillator group is internally composed of a plurality of narrow-band voltage-controlled oscillators, each narrow-band voltage-controlled oscillator comprises a plurality of frequency bands, and overlapped frequency bands exist between adjacent narrow-band voltage-controlled oscillators (VCO); the narrow-band voltage-controlled oscillator is connected with the loop low-pass filtering unit, receives the control voltage from the loop low-pass filtering unit, performs frequency control, outputs a frequency signal, and outputs a feedback signal to the loop N frequency division unit.
And the analog high-speed counting unit is connected with the narrow-band voltage-controlled oscillator group and the reference frequency division unit and is used for rapidly counting high-frequency signals in frequency signals of the narrow-band voltage-controlled oscillator, and counting pulses and counting values obtained after the high-frequency signals are counted are converted into low-frequency signals to be transmitted to the digital processing unit. The unit specifically works as follows: firstly, a reference signal from a reference frequency division unit is processed into a signal with a duty ratio of fifty percent, then the signal is converted into a differential signal, a high-frequency signal output by a narrow-band voltage-controlled oscillator group is counted in a high-level period of the converted differential signal, a counting pulse for completing one counting period and a counting value for not completing one counting period when counting is finished are given in a working period of an analog high-speed counting unit, and the counting pulse and the counting value are converted into a low-frequency signal processed by a digital circuit and transmitted to a digital processing unit. The unit has the following characteristics: the circuit operates only during frequency hopping and stops once frequency hopping is completed, thereby saving power consumption.
The digital processing unit comprises a narrow band voltage controlled oscillator for searching output target frequency and an algorithm of a frequency band of the narrow band voltage controlled oscillator, receives a low-frequency signal from the analog high-speed counting unit, gives a counting pulse for completing a counting period and a counting value for not being full of the counting period when the counting is finished during the working period of the analog high-speed counting unit, and calculates the frequency of the current narrow band voltage controlled oscillator by using the counting pulse and the counting value, so that the frequency bands of the narrow band voltage controlled oscillator for outputting the target frequency and the narrow band voltage controlled oscillator are searched.
The reference signal circuit comprises a reference crystal oscillator 1 and a reference frequency division unit 2 which are connected.
All circuits except the reference crystal oscillator and the loop low-pass filtering unit, including a reference frequency division unit 2, a phase discriminator unit 3, a charge pump unit 4, a power amplification unit 6, a loop N frequency division unit 7, an analog high-speed counting unit 8, a digital processing unit 9 and a narrow-band voltage-controlled oscillation group 10, are integrated into a phase-locked loop chip.
The analog high-speed counting unit 8 is an analog circuit, can work under the signal frequency of the narrow-band voltage controlled oscillator, and only works during the frequency hopping period, and after the frequency hopping is finished, the unit stops working.
According to the invention, the analog high-speed counting unit 8 is utilized to quickly count the high-frequency signals in the frequency signals of the narrow-band voltage-controlled oscillator, then the high-frequency signals are converted into low-frequency signals to the digital processing unit 9, the target narrow-band voltage-controlled oscillator is quickly locked, then the frequency band of the narrow-band voltage-controlled oscillator is locked, once the narrow-band voltage-controlled oscillator and the frequency band of the narrow-band voltage-controlled oscillator are determined, the quick frequency hopping loop is switched to the phase-locked loop, and. The invention adopts the mode of the narrow-band voltage-controlled oscillator group 10 to realize the output of the signal wide band, and accelerates the high-frequency signal counting of the narrow-band voltage-controlled oscillator by utilizing the analog high-speed counting unit, thereby shortening the time of frequency hopping of the wide-band phase-locked loop.
The foregoing is a more detailed description of the present invention that is presented in conjunction with specific embodiments, and the practice of the invention is not to be considered limited to those descriptions. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (7)
1. A phase-locked loop with a broadband fast frequency hopping function is characterized by comprising an analog high-speed counting unit, a digital processing unit and a narrow-band voltage-controlled oscillation group;
the narrow-band voltage-controlled oscillator group consists of a plurality of narrow-band voltage-controlled oscillators, and the narrow-band voltage-controlled oscillators output frequency signals;
the analog high-speed counting unit is used for rapidly counting high-frequency signals in the frequency signals output by the narrow-band voltage-controlled oscillator, and counting pulses and counting values obtained after the high-frequency signals are counted are converted into low-frequency signals to be transmitted to the digital processing unit;
and the digital processing unit is used for receiving the counting pulse and the counting value from the analog high-speed counting unit, calculating the frequency of the current narrow-band voltage-controlled oscillator by using the counting pulse and the counting value, and searching the narrow-band voltage-controlled oscillator outputting the target frequency and the frequency band of the narrow-band voltage-controlled oscillator.
2. The phase-locked loop with the broadband fast frequency hopping function according to claim 1, further comprising a phase detector unit, a charge pump unit, a loop low-pass filtering unit, a power amplifying unit and a loop N-frequency dividing unit;
the phase discriminator unit is used for comparing the phases of the reference signal and the feedback signal output by the loop N frequency division unit after frequency division to form a phase difference signal;
the charge pump unit is used for converting the phase difference signal formed by the phase discriminator unit into a voltage signal;
the loop low-pass filtering unit is used for performing low-pass filtering on the phase difference signal processed by the charge pump unit and outputting control voltage;
the narrow band voltage controlled oscillator receives the control voltage from the loop low-pass filter unit and performs frequency control; outputting a feedback signal to a loop N frequency division unit;
the loop N frequency division unit is used for receiving a feedback signal of the narrow band voltage controlled oscillator, carrying out frequency division and transmitting the frequency division signal to the phase discriminator unit;
and the power amplifier unit is used for amplifying the power of the frequency signal output by the narrow band voltage controlled oscillator and then outputting the frequency signal.
3. The phase locked loop with the wideband fast frequency hopping function according to claim 2, further comprising a reference crystal oscillator and a reference frequency dividing unit;
the reference crystal oscillator 1 is used for generating a differential analog reference input signal and transmitting the differential analog reference input signal to the reference frequency division unit;
and the reference frequency division unit is used for converting the differential analog reference input signal into a digital working signal, dividing the frequency at the same time to generate a reference signal and transmitting the reference signal to the analog high-speed counting unit and the phase discriminator unit.
4. The PLL of claim 3, wherein the reference divider, the phase discriminator, the charge pump, the power amplifier, the loop N divider, the analog high-speed counter, the digital processing and the narrow-band voltage controlled oscillator are integrated into a PLL chip.
5. A phase locked loop with wideband fast frequency hopping functionality according to claim 1, wherein each narrow band voltage controlled oscillator contains a plurality of frequency bands.
6. The phase locked loop with wideband fast frequency hopping function as claimed in claim 1, wherein the analog high speed counting unit and the digital processing unit operate during frequency hopping, and the analog high speed counting unit and the digital processing unit stop operating after the frequency hopping is completed.
7. The phase locked loop with wideband fast frequency hopping function as claimed in claim 1, wherein the analog high speed counter unit is integrated into the phase locked loop chip.
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