CN113114232A - Voltage-controlled oscillator frequency calibration circuit and calibration method - Google Patents
Voltage-controlled oscillator frequency calibration circuit and calibration method Download PDFInfo
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- CN113114232A CN113114232A CN202110284838.8A CN202110284838A CN113114232A CN 113114232 A CN113114232 A CN 113114232A CN 202110284838 A CN202110284838 A CN 202110284838A CN 113114232 A CN113114232 A CN 113114232A
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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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- 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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- 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
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Abstract
The invention relates to a frequency calibration circuit and a calibration method of a voltage-controlled oscillator, wherein the frequency calibration circuit of the voltage-controlled oscillator comprises a control unit, a multi-section voltage-controlled oscillator, a loop filter and a phase discriminator; the calibration method comprises step S1, writing the un-calibrated highest frequency and lowest frequency of the multi-segment voltage-controlled oscillator in different frequency bands into the control unit; step S2, calibrating the highest frequency of the frequency band and recording the highest frequency in the control unit; step S3, after calibrating the highest frequency of the frequency band, calibrating the lowest frequency of the frequency band and recording the lowest frequency in the control unit; and step S4, ending the calibration until the calibration of the highest frequency and the lowest frequency of all frequency bands of the multi-segment voltage-controlled oscillator is completed. The invention can ensure that the frequency segments of the multi-segment voltage-controlled oscillators in different batches can completely cover the broadband frequency range under the full-temperature (high temperature, low temperature and normal temperature) state.
Description
Technical Field
The invention relates to the technical field of radio frequency microwaves, in particular to a frequency calibration circuit and a frequency calibration method for a voltage-controlled oscillator.
Background
The phase-locked loop is widely applied to radio frequency microwave circuits and systems. Fig. 1 is a schematic block diagram of a typical single loop phase locked loop.
The phase-locked loop circuit is a closed loop system, and the most critical three devices of the system are: phase discriminator, loop filter, voltage controlled oscillator. The voltage-controlled oscillator is an important component of the circuit, the proper frequency is controlled and output by the tuning voltage of the input end, the voltage-controlled oscillator divides the signal into two paths by a shunt (power divider, coupler and the like), one path is directly output outwards, the other path is fed back to the phase discriminator, the feedback signal and the reference signal enter the phase discriminator to discriminate phase, the output signal generated by the phase discriminator generates the tuning voltage by a loop filter, the output frequency of the voltage-controlled oscillator is controlled, and the phase-locked loop circuit outputs stable signals outwards until the feedback process reaches a stable state.
The frequency range of the voltage-controlled oscillator determines the bandwidth of an output signal of the phase-locked loop, the broadband phase-locked loop needs to select the voltage-controlled oscillator with a wider frequency band, and the traditional broadband voltage-controlled oscillator has the following typical types: HMC6380, HMC733, etc., which are typically characterized by: the maximum tuning voltage is higher, and the frequency-push coefficient is higher. The higher tuning voltage requires an external power supply circuit to provide a direct current voltage with higher voltage, and the requirement on the power supply circuit is increased; the higher frequency-pulling coefficient has higher requirements on the configuration of the phase discriminator of the phase-locked loop circuit and the setting of the loop filter. Taking HMC6380 as an example, the output frequency is 8GHz-16GHz, the maximum tuning voltage is 23V, and the frequency-pushing coefficient is: 190 MHz/V. In recent years, a class of frequency multi-stage voltage-controlled oscillators has appeared and developed, and typical models are SIV100SP4, SIV019SP4, and the like, and the frequency multi-stage voltage-controlled oscillator is typically characterized in that: the frequency of the broadband voltage-controlled oscillator is divided into a plurality of sections of narrow-band voltage-controlled oscillators through logic control, and each section of narrow-band voltage-controlled oscillator is spliced and completely covers the broadband frequency range, so that the broadband voltage-controlled oscillator signals are output outwards. Compared with the traditional broadband voltage-controlled oscillator, the frequency multi-section voltage-controlled oscillator has lower phase noise. The biggest characteristic of the frequency multi-section voltage-controlled oscillator is to divide the frequency into a plurality of sections, so that the key point of circuit design is to select a proper frequency section combination to completely cover all frequency sections. Taking SIV019SP4 as an example, the output frequency is 8-16GHz, the maximum tuning voltage is 5V, the frequency-push coefficient is 20MHz/V, and the frequency segmentation is controlled through control bits S, S1, S2 and S3: frequency band 1(7.7GHz-8.5GHz), frequency band 2(8.0GHz-9.3GHz), frequency band 3(7.4GHz-9.7GHz), frequency band 4(8.9GHz-10.6GHz), frequency band 5(9.4GHz-11.0GHz), frequency band 6(9.8GHz-12.1GHz), frequency band 7(10.4GHz-12.7GHz), frequency band 8(11.6GHz-14.7GHz), frequency band 9(13.2GHz-16.3 GHz). The frequency bands 1, 2, 4, 6, 8 and 9 can be selected to completely cover the 8-16GHz broadband frequency range.
The multi-stage voltage-controlled oscillator has its advantages, but has an unavoidable disadvantage that the frequency division conditions of different batches of products are different due to the limitation of materials, processes and the like, so that the following conditions exist: the frequency band combination selected by the A batch can completely cover the A batch, but cannot completely cover the B batch of products. The frequency division conditions of the products in the same batch at high temperature, low temperature and normal temperature can also drift. Therefore, calibration of the frequency segmentation in phase locked loop applications is required for frequency multi-segment voltage controlled oscillators.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a frequency calibration circuit and a calibration method for a voltage controlled oscillator, which ensure that the frequency segments of the multi-segment voltage controlled oscillator in different batches can completely cover the wideband frequency range in the same batch under the full temperature (high temperature, low temperature, and normal temperature) state.
The technical problem to be solved by the invention is as follows:
a frequency calibration circuit of a voltage-controlled oscillator comprises a control unit, a multi-section voltage-controlled oscillator, a loop filter and a phase discriminator;
wherein, the control unit is respectively connected with the multi-section voltage-controlled oscillator and the phase discriminator;
the loop filter is positioned between the multi-section voltage-controlled oscillator and the phase discriminator and is respectively connected with the multi-section voltage-controlled oscillator and the phase discriminator;
the multi-section voltage-controlled oscillator is also connected with the phase discriminator.
In some possible embodiments, the control unit includes a memory to which the controller is connected.
In some possible implementations, the loop filter is an active loop filter or a passive loop filter.
In another aspect, a method for calibrating a frequency calibration circuit of a voltage controlled oscillator,
step S1, writing the uncalibrated highest frequency and lowest frequency in different frequency bands of the multi-segment voltage-controlled oscillator into the control unit;
step S2, calibrating the highest frequency of the frequency band and recording the highest frequency in the control unit;
step S3, after calibrating the highest frequency of the frequency band, calibrating the lowest frequency of the frequency band and recording the lowest frequency in the control unit;
and step S4, ending the calibration until the calibration of the highest frequency and the lowest frequency of all frequency bands of the multi-segment voltage-controlled oscillator is completed.
In some possible embodiments, the step S1 specifically includes the following steps:
step S11, selecting control codes of voltage-controlled oscillators in different frequency bands and the lowest frequency F of each frequency bandmin_nAnd the highest frequency Fmax_nWriting into a memory of the control unit;
step S12, setting a frequency range variable n, wherein n is a natural number and an initial value n is 0;
step S13, counting the frequency range variable n, adding 1, assigning n, and covering n with n value, namely n is n + 1;
in step S14, the controller sends an instruction to the multi-segment voltage-controlled oscillator to control the multi-segment voltage-controlled oscillator to operate in the frequency band n.
In some possible embodiments, the step S2 specifically includes the following steps:
step S21, setting a variable k, wherein k is an integer and an initial value k is 0;
step S22, counting the frequency band variable k, adding 1, assigning k, and covering a k value, namely k is k + 1;
step S23, the controller sends an instruction to the phase discriminator to calculate the output frequency of the phase discriminator;
step S24, the phase discriminator reports the state whether the phase-locked loop is locked to the control unit;
step S25, the controller judges whether the phase-locked loop is locked;
if not, returning to the step S21 until locking;
if so, recording the locked frequency value in the memory, wherein the frequency value is the highest frequency F of the calibrated frequency band nmax_n。
In some possible embodiments, in step S23, the method for calculating the output frequency of the phase detector specifically includes:
Fmax_nk＝fmax_n+(fmax_n-fmin_n)×a×k；
wherein, Fmax_nkIs the intermediate frequency value of the calibration process;
fmax_nthe highest frequency which is not calibrated in a certain frequency band;
fmin_nthe lowest frequency which is not calibrated in a certain frequency band;
k times of calibration, which belong to intermediate variables of the calibration process;
a is a scaling factor, and a belongs to [0,1 ].
In some possible embodiments, the step S3 specifically includes the following steps:
step S31: setting a variable m, wherein m is an integer, and an initial value m is 0;
step S32: adding 1 to the frequency range variable m count, assigning m, and covering with a value m, namely m is m + 1;
step S33: the controller sends an instruction to the phase discriminator and calculates the output frequency of the phase discriminator;
step S34: the phase discriminator reports the state whether the phase-locked loop is locked to the control unit;
step S35: the controller judges whether the phase-locked loop is locked or not;
if not, returning to the step S31 until locking;
if so, recording the locked frequency value in the memory, wherein the frequency value is the lowest frequency F of the calibrated frequency band nmin_n。
In some possible embodiments, in step S33, the calculation method for calculating the output frequency of the phase detector is as follows:
Fmin_nm＝fmin_n+(fmax_n-fmin_n)×b×m；
wherein, Fmin_nmIs the intermediate frequency value of the calibration process;
fmax_nthe highest frequency which is not calibrated in a certain frequency band;
fmin_nthe lowest frequency which is not calibrated in a certain frequency band;
m is the number of times of calibration and belongs to an intermediate variable in the calibration process;
b is a scale factor, and b belongs to [0,1 ].
In some possible embodiments, the step S4 specifically refers to:
the controller judges whether all frequency bands of the multi-section voltage-controlled oscillator are completely calibrated;
if not, returning to step S1, and executing steps S1-S4;
if all calibrations have been completed, the calibration process ends.
Compared with the prior art, the invention has the beneficial effects that:
the invention can ensure that the multi-section VCO frequency segments of the same batch can completely cover the broadband frequency range under the full-temperature (high temperature, low temperature and normal temperature) state of the multi-section pressing oscillators in different batches; effectively solves the problem that the frequency band combination selected by the A batch can completely cover the A batch, but can not completely cover the B batch
Drawings
FIG. 1 is a schematic diagram of the connection relationship of the calibration circuit according to the present invention;
FIG. 2 is a schematic diagram of a circuit interface of the control unit according to the present invention;
fig. 3 is a schematic diagram of a circuit interface of the phase detector of the present invention;
FIG. 4 is a schematic diagram of a circuit interface of the multi-stage VCO in the present invention;
fig. 5 is a circuit diagram of a passive loop filter employed in the loop filter of the present invention;
FIG. 6 is a flowchart of the operation of the calibration method of the present invention;
FIG. 7 is a schematic diagram showing the connection relationship among a control unit, a phase discriminator, a multi-stage VCO and a loop filter according to the present invention;
wherein: 1. a first resistor; 2. a second resistor; 3. (ii) a A first capacitor; 4. a third resistor; 5. a second capacitor; 6. a third capacitor; 7. and a fourth capacitor.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention will be described in detail and completely with reference to the accompanying drawings. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the detailed description of the embodiments of the present invention provided below is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention.
In the description of the present invention, it is to be understood that the terms indicating an orientation or positional relationship are based on the orientation or positional relationship shown in the drawings only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the drawings of the present invention, it should be understood that different technical features which are not mutually substituted are shown in the same drawing only for the convenience of simplifying the drawing description and reducing the number of drawings, and the embodiment described with reference to the drawings does not indicate or imply that all the technical features in the drawings are included, and thus the present invention is not to be construed as being limited thereto.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; either directly or indirectly through intervening media, either internally or in any other relationship. Reference herein to "first," "second," and similar words, does not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. In the implementation of the present application, "and/or" describes an association relationship of associated objects, which means that there may be three relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In the description of the embodiments of the present application, the meaning of "a plurality" means two or more unless otherwise specified. For example, the plurality of positioning posts refers to two or more positioning posts. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The present invention will be described in detail below.
As shown in figures 1-5 of the drawings,
a frequency calibration circuit of a voltage-controlled oscillator comprises a control unit, a multi-section voltage-controlled oscillator, a loop filter and a phase discriminator;
wherein, the control unit is respectively connected with the multi-section voltage-controlled oscillator and the phase discriminator;
the loop filter is positioned between the multi-section voltage-controlled oscillator and the phase discriminator and is respectively connected with the multi-section voltage-controlled oscillator and the phase discriminator;
the multi-section voltage-controlled oscillator is also connected with the phase discriminator.
In some possible embodiments, the control unit includes a memory to which the controller is connected.
In some possible implementations, the loop filter is an active loop filter or a passive loop filter.
Preferably, the phase detector is HMC 704; the loop filter adopts a passive loop filter; the multi-section voltage-controlled oscillator selects SIV019SP4 which is a broadband voltage-controlled oscillator integrating the function of a frequency divider, and covers the output frequency of the 8-16GHz frequency band without gaps; the controller and the memory of the control unit are realized by adopting independent functional devices, the controller adopts XC4VLX25, and the memory adopts XCF32PFS 48C.
Wherein, pin 19 of the phase discriminator is used as an input port of a reference signal, pin 5 and pin 6 are used as input ports of a feedback signal, a single-ended signal can select pin 5 as a feedback input, and pin 6 is matched with the ground; the pin 4 has a function of reporting the state whether the phase-locked loop is locked; pin 1, pin 2 and pin 24 can receive frequency code information sent by an external control signal to control the output frequency, and the control protocol adopts an SPI three-wire protocol; pin 16 is an output port for phase discrimination output signals, is connected with the passive loop filter, and leads out control voltage from the output end of the loop filter;
preferably, the reference signal is a 100MHz signal generated by a constant temperature crystal oscillator;
as shown in fig. 5, the passive loop filter includes a resistor one 1 and a resistor two 2 connected in series in this order, a capacitor one 3 and a resistor three 4 connected to an input terminal of the resistor one, respectively, a capacitor two 5 connected to an output terminal of the resistor one 1 and an input terminal of the resistor two 2, respectively, a capacitor three 6 connected to an output terminal of the resistor two 2, and a capacitor four 7 connected to an output terminal of the resistor three 4; the output ends of the first capacitor 3, the second capacitor 5, the third capacitor 6 and the fourth capacitor 7 are all grounded.
And pins 5, 6, 7 and 8 of the multi-section voltage-controlled oscillator are connected to XC4VLX25 of the control unit to control the section selection of the multi-section voltage-controlled oscillator.
The feedback signal is connected to pin 5 of the phase detector from the frequency division output port pin 20 of the multi-stage voltage-controlled oscillator, and the output signal is externally output from the output port pin 15 of the multi-stage voltage-controlled oscillator.
In the present invention, the control unit has the following features:
1. the control device is provided with a control device which can send control signals according to a certain control protocol content; the controller has the function of receiving and processing the state information input by the external circuit.
2. The memory device has a memory function, and the memory has the function that the memory information is not cleared after the system is powered down.
3. The controller and the memory can be integrated together to realize the function of the control unit, or can be mutually independent devices which are connected together in a certain mode to realize the function of the control unit.
The phase detector has the following characteristics:
1. with the basic undeletable function as a phase detector.
2. Having a reference signal input port and a radio frequency feedback signal input port.
3. A more typical lock status reporting method (but not limited to this method) reports the lock status through a lock indication (LD), where the lock indication (LD) is high, locked, and the lock indication (LD) is low, and unlocked, but other lock indication statuses are not excluded.
4. The present invention is not limited to the control protocol form, and the present invention has a function of receiving frequency code information transmitted by an external control signal to control an output frequency.
The loop filter has the following characteristics: it may be an active or passive loop filter, preferably a passive loop filter.
The multi-section voltage-controlled oscillator has the following characteristics:
1. has the fundamental function of being a voltage controlled oscillator that is not abrogable.
2. The control circuit can receive external control signals, divide a broadband frequency range section into a plurality of narrow band voltage-controlled oscillators, and select different frequency sections through the control signals.
3. Each narrowband voltage controlled oscillator tile must completely cover the wideband frequency range.
4. And 4, due to the limitation of materials, processes and the like, the frequency band division conditions of different batches of products have difference, or the frequency band division conditions of the same batch of products at high temperature, low temperature and normal temperature have difference.
The peripheral configuration circuit of the calibration circuit can be built according to a device manual and a reference circuit provided by a manufacturer, and detailed description is omitted.
On the other hand, as shown in fig. 6, the calibration method based on the calibration circuit specifically includes the following steps:
step S1, writing the uncalibrated highest frequency and lowest frequency in different frequency bands of the multi-segment voltage-controlled oscillator into the control unit;
the method specifically comprises the following steps:
step S11, selecting control codes of voltage-controlled oscillators in different frequency bands and the lowest frequency F of each frequency bandmin_nAnd the highest frequency Fmax_nWriting into a memory of the control unit;
step S12, setting a frequency range variable n, wherein n is a natural number and an initial value n is 0;
step S13, counting the frequency range variable n, adding 1, assigning n, and covering n with n value, namely n is n + 1;
in step S14, the controller sends an instruction to the multi-segment voltage-controlled oscillator to control the multi-segment voltage-controlled oscillator to operate in the frequency band n.
Step S2, calibrating the highest frequency of the frequency band and recording the highest frequency in the control unit; the method specifically comprises the following steps:
step S21, setting a variable k, wherein k is an integer and an initial value k is 0;
step S22, counting the frequency band variable k, adding 1, assigning k, and covering a k value, namely k is k + 1;
step S23, the modulator sends an instruction to the phase discriminator to calculate the output frequency of the phase discriminator; the calculation method for calculating the output frequency of the phase discriminator specifically comprises the following steps:
Fmax_nk＝fmax_n+(fmax_n-fmin_n) X a x k; wherein a takes 5%;
wherein, Fmax_nkIs the intermediate frequency value of the calibration process;
fmax_nthe highest frequency which is not calibrated in a certain frequency band;
fmin_nthe lowest frequency which is not calibrated in a certain frequency band;
k times of calibration, which belong to intermediate variables of the calibration process;
a is a scale factor, and a belongs to [0,1 ];
the smaller a is, the closer the frequency value after calibration is to the actual value, but the calibration times k are increased at the moment, and the calibration time is prolonged; for example, for a certain multi-segment voltage-controlled oscillator, a is selected to be 5% -10% (not limited to this value), which gives consideration to both the calibration accuracy and the calibration time.
Step S24, the phase discriminator reports the state whether the phase-locked loop is locked to the control unit;
step S25, the controller judges whether the phase-locked loop is locked;
if not, returning to the step S21 until locking;
if so, recording the locked frequency value in the memory, wherein the frequency value is the highest frequency F of the calibrated frequency band nmax_n。
Step S3, after calibrating the highest frequency of the frequency band, calibrating the lowest frequency of the frequency band and recording the lowest frequency in the control unit; the method specifically comprises the following steps:
step S31: setting a variable m, wherein m is an integer, and an initial value m is 0;
step S32: adding 1 to the frequency range variable m count, assigning m, and covering with a value m, namely m is m + 1;
step S33: the controller sends an instruction to the phase discriminator and calculates the output frequency of the phase discriminator; the calculation method for calculating the output frequency of the phase discriminator comprises the following steps:
Fmin_nm＝fmin_n+(fmax_n-fmin_n) X b x m; wherein b takes 5 percent
Wherein, Fmin_nmIs the intermediate frequency value of the calibration process;
fmax_nthe highest frequency which is not calibrated in a certain frequency band;
fmin_nthe lowest frequency which is not calibrated in a certain frequency band;
m is the number of times of calibration and belongs to an intermediate variable in the calibration process;
b is a scale factor, and b belongs to [0,1 ];
b is smaller, the frequency value after calibration is closer to the actual value, but the calibration frequency k is increased at the moment, and the calibration time is prolonged; for example, for a certain multi-section voltage-controlled oscillator, b is selected to be 5% -10% (not limited to the value), and both the calibration accuracy and the calibration time are considered; the values of a and b can be the same or different.
Step S34: the phase discriminator reports the state whether the phase-locked loop is locked to the control unit;
step S35, the controller judges whether the phase-locked loop is locked;
if not, returning to the step S31 until locking;
if so, recording the locked frequency value in the memory, wherein the frequency value is the lowest frequency F of the calibrated frequency band nmin_n。
Step S4, the calibration is finished until the calibration of the highest frequency and the lowest frequency of all frequency bands of the multi-section voltage-controlled oscillator is finished; the method specifically comprises the following steps:
the controller judges whether all frequency bands of the multi-section voltage-controlled oscillator are completely calibrated;
if not, returning to step S1, and executing steps S1-S4;
if all calibrations have been completed, the calibration process ends.
It should be noted that, when n is 1, the calibration method may be used for frequency calibration of a conventional voltage-controlled oscillator.
In the present invention, "n +1, k +1, and m + 1" means operation and assignment, and does not mean that the formula is determined as an equation.
Aiming at the sectional frequency offset of the multi-section VCO caused by factors such as materials, processes and the like, the invention can effectively solve the problem that the frequency band combination selected by the A batch can completely cover the A batch, but can not completely cover the B batch. "is used in the above-mentioned patent publication.
The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.
Claims (10)
1. A frequency calibration circuit of a voltage-controlled oscillator is characterized by comprising a control unit, a multi-section voltage-controlled oscillator, a loop filter and a phase discriminator;
wherein, the control unit is respectively connected with the multi-section voltage-controlled oscillator and the phase discriminator;
the loop filter is positioned between the multi-section voltage-controlled oscillator and the phase discriminator and is respectively connected with the multi-section voltage-controlled oscillator and the phase discriminator;
the multi-section voltage-controlled oscillator is also connected with the phase discriminator.
2. The vco frequency calibration circuit of claim 1, wherein the control unit comprises a memory connected to the controller.
3. The vco frequency calibration circuit of claim 2, wherein the loop filter is an active loop filter or a passive loop filter.
4. A method of calibrating a voltage controlled oscillator frequency calibration circuit according to any one of claims 1 to 3,
step S1, writing the uncalibrated highest frequency and lowest frequency in different frequency bands of the multi-segment voltage-controlled oscillator into the control unit;
step S2, calibrating the highest frequency of the frequency band and recording the highest frequency in the control unit;
step S3, after calibrating the highest frequency of the frequency band, calibrating the lowest frequency of the frequency band and recording the lowest frequency in the control unit;
and step S4, ending the calibration until the calibration of the highest frequency and the lowest frequency of all frequency bands of the multi-segment voltage-controlled oscillator is completed.
5. The method for calibrating frequency of a voltage controlled oscillator according to claim 4, wherein the step S1 specifically comprises the following steps:
step S11, selecting control codes of voltage-controlled oscillators in different frequency bands and the lowest frequency F of each frequency bandmin_nAnd the highest frequency Fmax_nWriting into a memory of the control unit;
step S12, setting a frequency range variable n, wherein n is a natural number and an initial value n is 0;
step S13, counting the frequency range variable n, adding 1, assigning n, and covering n with n value, namely n is n + 1;
in step S14, the controller sends an instruction to the multi-segment voltage-controlled oscillator to control the multi-segment voltage-controlled oscillator to operate in the frequency band n.
6. The method according to claim 4, wherein the step S2 specifically comprises the following steps:
step S21, setting a variable k, wherein k is an integer and an initial value k is 0;
step S22, counting the frequency band variable k, adding 1, assigning k, and covering a k value, namely k is k + 1;
step S23, the controller sends an instruction to the phase discriminator to calculate the output frequency of the phase discriminator;
step S24, the phase discriminator reports the state whether the phase-locked loop is locked to the control unit;
step S25, the controller judges whether the phase-locked loop is locked;
if not, returning to the step S21 until locking;
if so, recording the locked frequency value in the memory, wherein the frequency value is the highest frequency F of the calibrated frequency band nmax_n。
7. The method for calibrating the frequency of a voltage-controlled oscillator according to claim 6, wherein in step S23, the method for calculating the output frequency of the phase detector specifically includes:
Fmax_nk＝fmax_n+(fmax_n-fmin_n)×a×k；
wherein, Fmax_nkIs the intermediate frequency value of the calibration process;
fmax_nthe highest frequency which is not calibrated in a certain frequency band;
fmin_nthe lowest frequency which is not calibrated in a certain frequency band;
k times of calibration, which belong to intermediate variables of the calibration process;
a is a scaling factor, and a belongs to [0,1 ].
8. The method according to claim 4, wherein the step S3 specifically includes the following steps:
step S31: setting a variable m, wherein m is an integer, and an initial value m is 0;
step S32: adding 1 to the frequency range variable m count, assigning m, and covering with a value m, namely m is m + 1;
step S33: the controller sends an instruction to the phase discriminator and calculates the output frequency of the phase discriminator;
step S34: the phase discriminator reports the state whether the phase-locked loop is locked to the control unit;
step S35, the controller judges whether the phase-locked loop is locked;
if not, returning to the step S31 until locking;
if so, recording the locked frequency valueIn the memory, the frequency value is the lowest frequency F of the calibrated frequency band nmin_n。
9. The method for calibrating frequency of a voltage controlled oscillator according to claim 8, wherein in step S33, the method for calculating the output frequency of the phase detector comprises:
Fmin_nm＝fmin_n+(fmax_n-fmin_n)×b×m；
wherein, Fmin_nmIs the intermediate frequency value of the calibration process;
fmax_nthe highest frequency which is not calibrated in a certain frequency band;
fmin_nthe lowest frequency which is not calibrated in a certain frequency band;
m is the number of times of calibration and belongs to an intermediate variable in the calibration process;
b is a scale factor, and b belongs to [0,1 ].
10. The method according to claim 4, wherein the step S4 specifically includes: .
The controller judges whether all frequency bands of the multi-section voltage-controlled oscillator are completely calibrated;
if not, returning to step S1, and executing steps S1-S4;
if all calibrations have been completed, the calibration process ends.
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| CN113114232B (en) | 2023-08-29 |
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