CN112152610B - Phase-locked loop with broadband rapid frequency hopping function - Google Patents
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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 count values obtained after the counting of the high-frequency signals are converted into low-frequency signals and 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 narrowband voltage-controlled oscillator by utilizing the counting pulse and the counting value, and searching the narrowband voltage-controlled oscillator outputting the target frequency and the frequency band of the narrowband voltage-controlled oscillator. The invention can reduce the frequency hopping time of the phase-locked loop under the condition of not affecting 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 equipment of the modern radio communication system, the quality of the output signal directly determines the performance of the system, and low phase noise, low spurious, fast frequency hopping and the like become the necessary demands 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, the pll chip generally adopts a plurality of narrowband voltage-controlled oscillator groups to realize signal wide frequency band output in a combined mode, the narrowband voltage-controlled oscillators have the characteristics of low tuning voltage and narrow tuning voltage range, and each narrowband 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, the frequency hopping time is required.
However, at present, the fast frequency hopping is often implemented by combining with the DDS, but this approach clearly increases the cost and greatly increases the power consumption. In addition, referring to fig. 1, in order to show a block diagram of the existing frequency hopping technology, the implementation manner for saving the cost is to integrate the frequency hopping algorithm in the phase-locked loop chip, but the frequency of the narrowband voltage-controlled oscillator group has to be reduced to the frequency that can be processed by the digital circuit due to the limitation of the working frequency of the digital circuit processing unit, which finally results in long frequency hopping time.
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 broadband rapid frequency hopping function comprises an analog high-speed counting unit, a digital processing unit and a narrowband 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 count values obtained after the counting of the high-frequency signals are converted into low-frequency signals and 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 narrowband voltage-controlled oscillator by utilizing the counting pulse and the counting value, and searching the narrowband voltage-controlled oscillator outputting the target frequency and the frequency band of the narrowband voltage-controlled oscillator.
Preferably, the circuit also comprises a phase discriminator unit, a charge pump unit, a loop low-pass filter unit, a power amplifying unit and a loop N frequency dividing unit;
the phase discriminator unit is used for comparing the phase of the reference signal with the feedback signal output by the loop N frequency dividing unit after frequency division to form a phase difference signal;
a charge pump unit for converting the phase difference signal formed by the phase detector unit into a voltage signal;
the loop low-pass filtering unit is used for carrying out 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 filtering unit and performs frequency control; outputting a feedback signal to the loop divide-by-N unit;
the loop N frequency dividing unit is used for receiving the feedback signal of the narrow-band voltage-controlled oscillator, dividing the frequency and transmitting the feedback 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 outputting the amplified frequency signal.
Further, the device also comprises 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 dividing unit;
and the reference frequency dividing unit is used for converting the differential analog reference input signal into a digital working signal, dividing the frequency at the same time, generating a reference signal and transmitting the reference signal to the analog high-speed counting unit and the phase discriminator unit.
Still further, the reference frequency division unit, the phase discriminator unit, the charge pump unit, the power amplification unit, the loop divide by N unit, the analog high-speed counting unit, the digital processing unit and the narrow-band voltage-controlled oscillation group are integrated into a phase-locked loop chip.
Preferably, each narrowband 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 a phase-locked loop chip.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention provides a broadband phase-locked loop capable of fast frequency hopping, aiming at the research of the prior phase-locked loop frequency hopping technology, which can accelerate the counting of high-frequency signals of a narrow-band voltage-controlled oscillator by setting up an analog high-speed counting circuit under the condition of not influencing the performance of the phase-locked loop, and process the low-frequency signals obtained after the high-frequency counting to a digital circuit, thereby fast selecting a proper narrow-band voltage-controlled oscillator from a plurality of narrow-band voltage-controlled oscillators, selecting a target frequency band from a plurality of frequency bands of the narrow-band voltage-controlled oscillator, and finally reducing the frequency hopping time of the phase-locked loop in the mode. The phase-locked loop structure has the characteristics of ultra-wideband and rapid frequency hopping, and is easy to realize miniaturized frequency source design.
Further, the analog high-speed counting unit only works in the frequency hopping period, and stops working once the frequency hopping is completed, so that power consumption is saved.
Furthermore, the invention integrates the analog high-speed counting unit into the phase-locked loop chip, and compared with the mode of combining the phase-locked loop chip and the DDS chip, the invention not only can reduce the system cost, but also can reduce the system volume and the like. Compared with the mode of processing by a digital circuit alone, the analog high-speed counting unit increases the chip area of the phase-locked loop, but does not influence the power consumption and the performance of the phase-locked loop chip under the normal working condition, and improves the rapid frequency hopping performance of the broadband phase-locked loop.
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 device comprises a reference crystal oscillator 1, a reference frequency dividing unit 2, a phase discriminator unit 3, a charge pump unit 4, a loop low-pass filter 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 narrow-band voltage-controlled oscillator group 10.
Detailed Description
The invention will now be described in further detail with reference to specific examples, which are intended to illustrate, but not to limit, the invention.
Referring to fig. 2, a pll with 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 divide-by-N 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 division unit 2 is connected to a first input end of the phase discriminator unit 3, the output end of the phase discriminator unit 3 is connected to an input end of the charge pump unit 4, the output end of the charge pump unit 4 is connected to an input end of the loop low-pass filter unit 5, the output end of the loop low-pass filter unit 5 is connected to a 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 an input end of the power amplification unit 6, the output end of the narrow-band voltage-controlled oscillator group 10 is connected to an input end of the loop divide-by-N unit 7, and the output end of the loop divide-by-N unit 7 is connected to a second input end of the phase discriminator unit 3, thereby forming a phase-locked loop.
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 carries out frequency division to generate a reference signal.
And the phase discriminator unit is used for comparing the phase of the reference signal generated by the reference frequency division unit with the phase of the feedback signal output by the loop N frequency division unit to form a phase difference signal.
And the charge pump unit is used for converting the phase difference signal formed by the phase detector unit into a voltage signal.
And the loop low-pass filtering unit is connected with the charge pump unit and is used for carrying out low-pass filtering on the phase difference signals.
And the loop N frequency dividing unit is used for receiving the feedback signal of the narrow-band voltage-controlled oscillator, dividing the frequency and transmitting the feedback 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 outputting the amplified 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 overlapping frequency bands exist between adjacent narrow-band voltage-controlled oscillators (VCOs); 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 dividing unit.
The analog high-speed counting unit is connected with the narrow-band voltage-controlled oscillator group and the reference frequency dividing 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 counting of the high-frequency signals are converted into low-frequency signals and transmitted to the digital processing unit. The specific working process of the unit is as follows: the reference signal from the reference frequency dividing unit is processed into a signal with fifty percent of duty ratio, the signal is converted into a differential signal, the high-frequency signal output by the narrow-band voltage-controlled oscillator group is counted by utilizing the high-level period of the converted differential signal, the counting pulse completing one counting period and the counting value less than one counting period at the end of the counting are given out during the working period of the analog high-speed counting unit, and the counting pulse and the counting value are converted into the low-frequency signal processed by the digital circuit and are transmitted to the digital processing unit. The unit has the following characteristics: the circuit only works in the frequency hopping period, and once the frequency hopping is completed, the circuit stops working, so that the power consumption is saved.
The digital processing unit comprises an algorithm for searching a narrow-band voltage-controlled oscillator and a frequency band of the narrow-band voltage-controlled oscillator for outputting a target frequency, receives a low-frequency signal from the analog high-speed counting unit, gives a counting pulse for completing one counting period and a counting value less than one counting period when the counting is finished during the operation 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, thereby searching the narrow-band voltage-controlled oscillator and the frequency band of the narrow-band voltage-controlled oscillator for outputting the target frequency.
The reference signal circuit comprises a reference crystal oscillator 1 and a reference frequency dividing unit 2 which are connected.
All circuits except the reference crystal oscillator and the loop low-pass filtering unit, including the reference frequency dividing unit 2, the phase discriminator unit 3, the charge pump unit 4, the power amplifying unit 6, the loop frequency dividing unit N7, the analog high-speed counting unit 8, the digital processing unit 9 and the 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 a narrow-band voltage-controlled oscillator, only works in the frequency hopping period, and stops working after the frequency hopping is completed.
The invention uses the analog high-speed counting unit 8 to count the high-frequency signal in the frequency signal of the narrow-band voltage-controlled oscillator, then converts the high-frequency signal into the low-frequency signal to the digital processing unit 9, firstly locks the target narrow-band voltage-controlled oscillator quickly, then locks the frequency band of the target narrow-band voltage-controlled oscillator, once the narrow-band voltage-controlled oscillator and the frequency band of the target narrow-band voltage-controlled oscillator are determined, turns off the quick frequency hopping loop, switches to the phase-locked loop, and finally shortens the frequency hopping time of the broadband phase-locked loop effectively. The invention adopts the mode of the narrow-band voltage-controlled oscillator group 10 to realize the signal broadband output, and the high-frequency signal counting of the narrow-band voltage-controlled oscillator is quickened by utilizing the analog high-speed counting unit, so that the time of frequency hopping of the broadband phase-locked loop is shortened.
The foregoing is a further detailed description of the invention in connection with specific embodiments, and it is not intended that the invention be limited to such description. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the invention, and these should be considered to be within the scope of the invention.
Claims (7)
1. The phase-locked loop with the broadband rapid frequency hopping function is characterized by comprising an analog high-speed counting unit, a digital processing unit and a narrowband 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 count values obtained after the counting of the high-frequency signals are converted into low-frequency signals and 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 narrowband voltage-controlled oscillator by utilizing the counting pulse and the counting value, and searching the narrowband voltage-controlled oscillator outputting the target frequency and the frequency band of the narrowband voltage-controlled oscillator.
2. The phase-locked loop with broadband fast frequency hopping function according to claim 1, further comprising a phase discriminator unit, a charge pump unit, a loop low-pass filter unit, a power amplifying unit, and a loop divide-by-N unit;
the phase discriminator unit is used for comparing the phase of the reference signal with the feedback signal output by the loop N frequency dividing unit after frequency division to form a phase difference signal;
a charge pump unit for converting the phase difference signal formed by the phase detector unit into a voltage signal;
the loop low-pass filtering unit is used for carrying out 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 filtering unit and performs frequency control; outputting a feedback signal to the loop divide-by-N unit;
the loop N frequency dividing unit is used for receiving the feedback signal of the narrow-band voltage-controlled oscillator, dividing the frequency and transmitting the feedback 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 outputting the amplified frequency signal.
3. The phase-locked loop with broadband 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 dividing unit;
and the reference frequency dividing unit is used for converting the differential analog reference input signal into a digital working signal, dividing the frequency at the same time, generating a reference signal and transmitting the reference signal to the analog high-speed counting unit and the phase discriminator unit.
4. The pll with wideband fast frequency hopping according to claim 3, wherein the reference frequency dividing unit, the phase discriminator unit, the charge pump unit, the power amplifying unit, the loop divide-by-N unit, the analog high speed counting unit, the digital processing unit, and the narrowband voltage controlled oscillation group are integrated into a pll chip.
5. The pll with wideband fast frequency hopping function as claimed in claim 1, wherein each narrowband voltage controlled oscillator comprises a plurality of frequency bands.
6. The phase locked loop with broadband fast frequency hopping function according to 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 broadband fast frequency hopping function according to claim 1, wherein the analog high-speed counting unit is integrated into the phase-locked loop chip.
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