Calibration method, device and equipment for voltage-controlled oscillator traction and transmitter device

Abstract

The invention relates to the direct frequency conversion transmitter technology, and discloses a voltage-controlled oscillator traction calibration method, device and equipment and a transmitter device.The method comprises the steps that a local oscillator signal output by a voltage-controlled oscillator in a transmitting circuit according to a preset delay value is obtained; performing down-mixing on the local oscillator signal to obtain a low-frequency signal, and calculating traction energy of the low-frequency signal; generating a delay value-traction energy function according to the delay value and the traction energy, and determining a target delay value for calibration according to the delay traction function; and calibrating the delay on the transmitting circuit through the target delay value so as to reduce the traction of the voltage-controlled oscillator. According to the invention, accurate calibration of traction can be realized while the complexity of circuit design is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of direct frequency conversion transmitters, and in particular to a calibration method, device, equipment and transmitter device for pulling a voltage-controlled oscillator. Background Art

[0002] Direct frequency conversion transmitters are widely used in the field of wireless communications due to their simple architecture and low power consumption, but they also have obvious disadvantages: the local oscillator is easily interfered by the power amplifier, and the voltage-controlled oscillator generates traction due to electromagnetic interference. This traction will seriously affect the quality of the transmitted signal as the transmission power increases, greatly limiting the performance of the transmitter.

[0003] For example, in the traditional direct conversion transmitter architecture, the voltage controlled oscillator (VCO) operates at a multiple of the carrier frequency. The local oscillator output by the voltage controlled oscillator is mixed with the I and Q signals from the baseband and then output to the power amplifier. After being amplified by the power amplifier, it is output by the antenna. Since the power amplifier current is large, the integer harmonic current it generates will cause corresponding induced current in the resonant cavity of the voltage controlled oscillator through bonding line coupling, transformer coupling, substrate coupling, etc., and as the current increases, an increasingly serious injection locking effect is generated on the voltage controlled oscillator, generating a symmetrical signal very close to the local oscillator frequency at the output end of the local oscillator, causing the final output signal of the direct conversion transmitter to be seriously distorted.

[0004] There are currently two mainstream approaches to solving the problems caused by pulling: one is to make the voltage-controlled oscillator operate at a frequency that is not an integer multiple of the carrier wave, so that it is difficult for the power amplifier to interfere with the local oscillator; the other is to make the voltage-controlled oscillator operate at a frequency that is an integer multiple of the carrier wave, but through calibration using various different methods, the pulling phenomenon is reduced.

[0005] Based on the second solution, the prior art proposes to calculate the phase of the final pull to the voltage-controlled oscillator, and conclude that a calibration voltage can always be found to be added to the control voltage of the voltage-controlled oscillator to reduce the pull, and the signal from the voltage-controlled oscillator is passed through a multi-mode frequency divider and a digital modulator to finally obtain a calibration signal, or the digital power amplifier is operated at a distance of 100kHz from the local oscillator to maximize the pulling effect between it and the digitally controlled oscillator, and the digitally controlled oscillator signal at this time is drawn out, and the error of the local oscillator phase is detected through a phase detector, and then the pull is weakened by adjusting the delay between the digitally controlled oscillator and the digital power amplifier. However, the above method has the following problems: an additional frequency division circuit is required in the implementation process to generate the required calibration voltage control signal, which increases the complexity and power consumption of the circuit design; or, when detecting the phase of the output signal of the digitally controlled oscillator, an additional phase detection circuit is required, which increases the complexity and power consumption of the design, and the improvement of the error vector amplitude is not significant.

[0006] In summary, how to achieve accurate calibration of traction while reducing the complexity of circuit design has become a problem that needs to be solved urgently. Summary of the invention

[0007] The present invention provides a voltage-controlled oscillator pulling calibration method, device, electronic equipment, computer-readable storage medium and transmitter device, the main purpose of which is to solve the problem of how to achieve accurate calibration of pulling while reducing the complexity of circuit design.

[0008] To achieve the above object, the present invention provides a voltage-controlled oscillator pulling calibration method, comprising:

[0009] Acquire a local oscillator signal output by a voltage-controlled oscillator in a transmitting circuit according to a preset delay value;

[0010] Down-mixing the local oscillator signal to obtain a low-frequency signal, and calculating the pulling energy of the low-frequency signal;

[0011] generating a delay value-traction energy function according to the delay value and the traction energy, and determining a target delay value for calibration according to the delay traction function;

[0012] The delay on the transmitting circuit is calibrated by the target delay value to reduce the pulling of the voltage controlled oscillator.

[0013] Optionally, down-mixing the local oscillator signal to obtain a low-frequency signal includes:

[0014] Acquire a local oscillator signal, and perform calculations based on the local oscillator signal and the local oscillator signal to obtain an intermediate frequency signal;

[0015] The intermediate frequency signal is subjected to denoising and enhancement processing to obtain a low frequency signal.

[0016] Optionally, calculating the traction energy of the low-frequency signal includes:

[0017] Performing digital-to-analog conversion on the low-frequency signal to obtain a digital signal;

[0018] Perform Fourier transform on the digital signal to obtain the pulling energy.

[0019] Optionally, generating a delay value-traction energy function according to the delay value and the traction energy includes:

[0020] Acquire different delay values ​​and traction energies corresponding to different delay values;

[0021] Function fitting is performed according to the delay value and the traction energy to obtain the delay value-traction energy function.

[0022] Optionally, after acquiring the local oscillation signal output by the voltage-controlled oscillator in the transmitting circuit according to the preset delay value, the method further includes:

[0023] Performing frequency division on the local oscillator signal to obtain a frequency-divided signal;

[0024] Acquire a single tone signal, and up-mix the single tone signal and the frequency-divided signal to obtain a mixed signal;

[0025] After the mixed signal is input into a power amplifier, a transmission signal is obtained.

[0026] Optionally, acquiring a single tone signal includes:

[0027] Get the bandwidth of the phase-locked loop;

[0028] The baseband generates a single tone signal of a specific frequency according to the bandwidth.

[0029] Optionally, up-mixing the single tone signal and the frequency-divided signal to obtain a mixed signal includes:

[0030] Determine an I-channel signal and a Q-channel signal according to the single-tone signal;

[0031] The frequency-divided signal is multiplied by the I-path signal and the Q-path signal respectively to obtain a mixed signal.

[0032] In order to solve the above problems, the present invention further provides a voltage-controlled oscillator pulling calibration device, the device comprising:

[0033] A voltage-controlled oscillator, used to obtain a local oscillation signal output by a voltage-controlled oscillator in a transmitting circuit according to a preset delay value;

[0034] A pulling calibration module, used for down-mixing the local oscillator signal to obtain a low-frequency signal, and calculating the pulling energy of the low-frequency signal;

[0035] A digitally controlled delay module is used to generate a delay value-traction energy function according to the delay value and the traction energy, determine a target delay value for calibration according to the delay traction function; and calibrate the delay on the transmitting circuit by using the target delay value to reduce the traction of the voltage-controlled oscillator.

[0036] In order to solve the above problem, the present invention further provides an electronic device, the electronic device comprising:

[0037] at least one processor; and,

[0038] a memory communicatively connected to the at least one processor; wherein,

[0039] The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can perform the above-mentioned voltage-controlled oscillator pulling calibration method.

[0040] In order to solve the above problems, the present invention also provides a computer-readable storage medium, in which at least one computer program is stored. The at least one computer program is executed by a processor in an electronic device to implement the above-mentioned voltage-controlled oscillator pulling calibration method.

[0041] In order to solve the above problem, the present invention further provides a transmitter device, which includes: a mixer, a power amplifier, a transmitting antenna and a calibration device pulled by the voltage-controlled oscillator mentioned above.

[0042] The present invention generates a delay value-traction energy function through a multi-phase error preset delay value, and finally reflects the influence of traction on the transmission performance in the size of the energy generated by traction, thereby realizing a more accurate and intuitive direct calibration of the energy of the local oscillator; by processing the local oscillator signal derived from the voltage-controlled oscillator, the obtained signal energy is relatively pure and has no attenuation; the present invention does not need to add additional frequency dividers, phase detectors, etc., will not increase power consumption, and the number of added modules is very small, reducing the complexity of the calibration design. Therefore, the calibration method, device, electronic device, computer-readable storage medium and transmitter device of the voltage-controlled oscillator traction proposed by the present invention can solve the problem of how to achieve accurate calibration of traction while reducing the complexity of circuit design. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 A schematic diagram of a flow chart of a voltage-controlled oscillator pull-in calibration method provided by an embodiment of the present invention;

[0044] Figure 2 A schematic diagram of the structure of an inverter connected to ground and power supply provided by an embodiment of the present invention;

[0045] Figure 3 A curve diagram showing the effect of the bandwidth of a phase-locked loop on traction provided by an embodiment of the present invention;

[0046] Figure 4 A flow chart of frequency processing of a local oscillator signal provided by an embodiment of the present invention;

[0047] Figure 5 A frequency signal transformation expression diagram after the local oscillator signal is pulled through energy calculation according to an embodiment of the present invention;

[0048] Figure 6A functional module diagram of a voltage-controlled oscillator pulling calibration device provided by an embodiment of the present invention;

[0049] Figure 7 A schematic diagram of the structure of a transmitter device provided by an embodiment of the present invention;

[0050] Figure 8 A schematic diagram of the structure of an electronic device for implementing the voltage-controlled oscillator pulling calibration method provided by an embodiment of the present invention.

[0051] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0052] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0053] The embodiment of the present application provides a calibration method for voltage-controlled oscillator traction. The execution subject of the calibration method for voltage-controlled oscillator traction includes but is not limited to at least one of the electronic devices such as a server, a terminal, etc. that can be configured to execute the method provided in the embodiment of the present application. In other words, the calibration method for voltage-controlled oscillator traction can be executed by software or hardware installed in a terminal device or a server device. The server includes but is not limited to: a single server, a server cluster, a cloud server or a cloud server cluster, etc. The server can be an independent server, or it can be a cloud server that provides basic cloud computing services such as cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communications, middleware services, domain name services, security services, content delivery networks (Content Delivery Network, CDN), and big data and artificial intelligence platforms.

[0054] The present invention proposes a calibration method for voltage-controlled oscillator pulling, which is to mix the local oscillator to a lower frequency, calculate the voltage-controlled oscillator pulling energy, and then calibrate the delay on the link from the voltage-controlled oscillator to the power amplifier to reduce the pulling of the voltage-controlled oscillator; in the current calibration scheme, the pulling is mostly calibrated by phase error or direct formula calculation, and the final effect of the pulling on the transmission performance is reflected in the amount of energy generated by the pulling. The present scheme directly calibrates the energy of the local oscillator, which will be more accurate and intuitive; in the design of the system on chip, calibration often requires the addition of more additional modules, such as dividers, phase detectors, etc. to implement, which results in an increase in power consumption and area, while the calibration scheme proposed by the present invention does not increase power consumption, and the number of added modules is very small, reducing the complexity of the design.

[0055] Reference Figure 1FIG. 2 is a flow chart of a calibration method for voltage-controlled oscillator pulling provided by an embodiment of the present invention. In this embodiment, the calibration method for voltage-controlled oscillator pulling includes:

[0056] S1. Obtain a local oscillator signal output by a voltage-controlled oscillator in a transmitting circuit according to a preset delay value.

[0057] In the embodiment of the present invention, the transmitting circuit is a circuit at the transmitting end of a direct frequency conversion transmitter; a direct frequency conversion transmitter is a radio communication device that uses direct frequency conversion technology to achieve signal transmission and can directly convert the input signal to the baseband frequency without the need for intermediate frequency or other types of frequency conversion.

[0058] In the embodiment of the present invention, a voltage-controlled oscillator (VCO) is an electronic device whose output frequency can be adjusted by an input voltage; the voltage-controlled oscillator is usually composed of an oscillation circuit and a control circuit, the oscillation circuit is responsible for generating a high-frequency signal, and the control circuit is used to adjust the frequency of the signal. In a voltage-controlled oscillator, when the input voltage changes, the frequency of the oscillator will also change accordingly; when the input voltage increases, the frequency of the oscillator will also increase; when the input voltage decreases, the frequency of the oscillator will also decrease.

[0059] Specifically, in the embodiment of the present invention, the voltage-controlled oscillator can be set to work at a multiple of the carrier frequency; when the input voltage is adjusted to a specific value, the output frequency of the oscillator will be an integer multiple of the carrier frequency. For example, if the carrier frequency is 100MHz, and the voltage-controlled oscillator is set to work at a multiple, then under a specific input voltage, the output frequency of the oscillator may be 200MHz, 300MHz, 400MHz, etc., and the frequency modulation of the output frequency can be achieved by controlling the input voltage of the voltage-controlled oscillator.

[0060] In the embodiment of the present invention, different delay values ​​correspond to different phases, and the voltage-controlled oscillator generates different local oscillation signals at different phases by adjusting the magnitude of the input voltage; specifically, when the control voltage changes linearly, the voltage-controlled oscillator generates a linearly changing frequency output. When the control voltage changes to a sine wave form, the voltage-controlled oscillator generates a sine wave signal that changes with time, and its frequency depends on the frequency of the input voltage and the characteristics of the oscillation circuit. Therefore, at different phases, the voltage-controlled oscillator can output local oscillation signals with different frequencies.

[0061] See also Figure 2As shown in the figure, it is a schematic diagram of the structure of the inverter connected to the ground and the power supply. The local oscillator signal passes through a power supply (represented as VDD in the figure) and an inverter with variable resistors on the ground (represented as inv in the figure). By controlling the size of the resistor (the digital switch controls the number of resistors that are turned on), the current size and swing of the inverter are changed, thereby controlling the size of the delay of the local oscillator signal passing through the inverter to determine different delay values.

[0062] In the embodiment of the present invention, the local oscillator signal in the transmitting circuit is generated by a phase-locked loop (PLL), a voltage-controlled oscillator, a frequency divider and other modules. In the present invention, the local oscillator signal is selected to be drawn from the voltage-controlled oscillator end, so that the energy of the obtained local oscillator signal is pure, and no attenuation or nonlinear influence is generated, so that the signal-to-noise ratio of the local oscillator signal is relatively high. If the signal is drawn from the frequency divider, the signal-to-noise ratio of the local oscillator signal will be reduced due to a certain attenuation effect, which is more complicated and less effective.

[0063] In the embodiment of the present invention, after obtaining the local oscillation signal output by the voltage-controlled oscillator in the transmitting circuit according to the preset delay value, the method further includes:

[0064] Performing frequency division on the local oscillator signal to obtain a frequency-divided signal;

[0065] Acquire a single tone signal, and up-mix the single tone signal and the frequency-divided signal to obtain a mixed signal;

[0066] After the mixed signal is input into a power amplifier, a transmission signal is obtained.

[0067] In the embodiment of the present invention, the working principle of the transmitting circuit is: the baseband signal (low frequency) is moved to the carrier frequency and finally transmitted; the local oscillator signal after frequency division is the carrier signal in the transmitting system, and its main function is to move the baseband signal carrying useful information to the channel (specific frequency) specified by the protocol.

[0068] In the embodiment of the present invention, the step of obtaining a single tone signal includes:

[0069] Get the bandwidth of the phase-locked loop;

[0070] The baseband generates a single tone signal of a specific frequency according to the bandwidth.

[0071] In the embodiment of the present invention, the step of up-mixing the single tone signal and the frequency division signal to obtain a mixed signal includes:

[0072] Determine an I-channel signal and a Q-channel signal according to the single-tone signal;

[0073] The frequency-divided signal is multiplied by the I-path signal and the Q-path signal respectively to obtain a mixed signal.

[0074] In the embodiment of the present invention, refer to Figure 3 As shown in the figure, it is a curve diagram of the influence of the bandwidth of the phase-locked loop on the traction; wherein, BW (Bandwidth) represents the bandwidth, the magnitude response in the ordinate represents the traction effect, and the offest frequency in the abscissa represents the offset frequency; for a specific phase-locked loop bandwidth, the influence of the traction will change with the change of the frequency. Therefore, the frequency at which the traction effect generated by the transmitting circuit is the largest can be selected by selecting a baseband single-tone signal of a suitable frequency to ensure sufficient signal-to-noise ratio when processing the signal.

[0075] In the embodiment of the present invention, the local oscillator signal is mixed with the I-channel and Q-channel signals from the baseband through a mixer, and then output to a power amplifier, which is usually used in a communication system with a modulation method of direct sequence spread spectrum. In this process, after the local oscillator signal is multiplied and mixed with the I-channel and Q-channel signals, signals with different frequency components are generated; these components include a signal with a frequency of zero (DC component), a signal with a frequency of the local oscillator frequency (up-conversion component), and a signal with a frequency of an increment / decrement of the local oscillator frequency (down-conversion component).

[0076] Furthermore, the above-mentioned mixed signal is input into a power amplifier for processing. Due to the nonlinear characteristics of the power amplifier, it may generate other nonlinear components, such as harmonics and intermodulation components. These nonlinear components may interfere with the local oscillator frequency and other frequency signals. In order to reduce interference propagation, a filter can be added before the power amplifier to suppress the nonlinear components.

[0077] In the embodiment of the present invention, a calibration process is completed by transmitting a single-tone signal of a specific frequency and then extracting a corresponding local oscillator signal from the voltage-controlled oscillator end for energy collection and calculation. If the spectrum of the modulated signal is transmitted, a section of energy needs to be integrated, which is relatively simple with a single-tone signal. Moreover, a specific frequency can be selected for the single-tone signal, and according to the bandwidth of the phase-locked loop at this time, the pulling effect generated by this specific frequency is maximized to improve the signal-to-noise ratio of the spectrum signal.

[0078] S2. Down-mix the local oscillator signal to obtain a low-frequency signal, and calculate the pulling energy of the low-frequency signal.

[0079] In the embodiment of the present invention, a high-frequency local oscillator signal may be mixed down to a lower frequency through a mixer and a filter.

[0080] In the embodiment of the present invention, down-mixing the local oscillator signal to obtain a low-frequency signal includes:

[0081] Acquire a local oscillator signal, and perform calculations based on the local oscillator signal and the local oscillator signal to obtain an intermediate frequency signal;

[0082] The intermediate frequency signal is subjected to denoising and enhancement processing to obtain a low frequency signal.

[0083] In an embodiment of the present invention, the local oscillator signal and the local oscillator signal can be multiplied by a mixer to obtain two output signals: an intermediate frequency signal and a sum frequency signal. The difference frequency signal refers to the frequency of the local oscillator signal minus the frequency of the local oscillator signal. After filtering and amplification, the signal can extract the required information; the sum frequency signal refers to the frequency of the local oscillator signal plus the frequency of the local oscillator signal, which is called a radio frequency signal. This signal is usually filtered out or reduced to a lower amplitude to avoid interference with the system; the intermediate frequency signal is then separated from the product by a filter to filter out high-order spurious signals; finally, the intermediate frequency signal can be further processed, amplified, demodulated, etc. to obtain a low-frequency signal.

[0084] In the embodiment of the present invention, the calculating of the pulling energy of the low-frequency signal includes:

[0085] Performing digital-to-analog conversion on the low-frequency signal to obtain a digital signal;

[0086] Perform Fourier transform on the digital signal to obtain the pulling energy.

[0087] See also Figure 4 As shown in the figure, it is a flow chart of the frequency processing of the local oscillator signal of the present invention, wherein the local oscillator signal output by the voltage-controlled oscillator (represented as VCO in the figure) is frequency-reduced by down-mixing and a filter (represented as flt in the figure), and then input to a digital-to-analog converter and a digital circuit (represented as ADC&dig in the figure) for conversion to obtain the input of the Fourier transform.

[0088] See also Figure 5 As shown, it is a frequency signal transformation expression diagram after the present invention performs traction energy calculation on the local oscillator signal.

[0089] S3. Generate a delay value-pulling energy function according to the delay value and the pulling energy, and determine a target delay value for calibration according to the delay pulling function.

[0090] In the embodiment of the present invention, the interference signal that causes the transmitting circuit to generate traction is very close to the operating frequency of the voltage-controlled oscillator. Assuming that both frequencies are 4.8G, they can be understood as two 4.8G sinusoidal signals. There is a phase relationship between the two sinusoidal signals. If the phase is 0, the two are in the same direction, and the superposition can amplify the energy of the voltage-controlled oscillation. If the phase is 180, the two are in opposite directions, and the superposition can weaken the energy of the voltage-controlled oscillation. The optimal delay can be determined through the relationship between the delay size and the traction energy, thereby generating the minimum traction value.

[0091] In the embodiment of the present invention, generating a delay value-traction energy function according to the delay value and the traction energy includes:

[0092] Acquire different delay values ​​and traction energies corresponding to different delay values;

[0093] Function fitting is performed according to the delay value and the traction energy to obtain the delay value-traction energy function.

[0094] In the embodiment of the present invention, the delay value-pulling energy function may be expressed in the form of a function curve or a function expression.

[0095] In an embodiment of the present invention, by traversing different delay values, a function of the delay value and the voltage-controlled oscillator traction energy is obtained, and then the optimal delay value, that is, the target delay value, is obtained; specifically, the target delay value can be the delay value corresponding to the maximum traction energy.

[0096] S4. Calibrate the delay on the transmitting circuit by using the target delay value to reduce the pulling of the voltage-controlled oscillator.

[0097] In an embodiment of the present invention, the phase corresponding to the target delay value is used to minimize the traction caused by the transmission signal emitted by the transmitting antenna on the voltage-controlled oscillator, and the phase relationship corresponding to the target delay value can reduce the traction between the transmission signal and the spectrum signal of the voltage-controlled oscillator.

[0098] The present invention generates a delay value-traction energy function through a multi-phase error preset delay value, and finally reflects the influence of traction on the transmission performance in the size of the energy generated by traction, thereby realizing a more accurate and intuitive direct calibration of the energy of the local oscillator; by performing signal processing on the local oscillator signal derived from the voltage-controlled oscillator, the obtained signal energy is relatively pure and has no attenuation; the present invention does not need to add additional frequency dividers, phase detectors, etc., will not increase power consumption, and the number of added modules is very small, reducing the complexity of the calibration design. Therefore, the calibration method of the voltage-controlled oscillator traction proposed by the present invention can solve the problem of how to achieve accurate calibration of traction while reducing the complexity of circuit design.

[0099] like Figure 6, is a functional module diagram of a voltage-controlled oscillator pulling calibration device 600 provided in one embodiment of the present invention. According to the functions to be implemented, the voltage-controlled oscillator pulling calibration device may include a voltage-controlled oscillator 601, a pulling calibration module 602, and a digital control delay module 603. The module described in the present invention may also be referred to as a unit, which refers to a series of computer program segments that can be executed by a processor of the voltage-controlled oscillator pulling calibration device and can complete fixed functions, which are stored in the memory of the voltage-controlled oscillator pulling calibration device.

[0100] In this embodiment, the functions of each module / unit are as follows:

[0101] The voltage-controlled oscillator 601 is used to obtain a local oscillation signal output by the voltage-controlled oscillator in the transmitting circuit according to a preset delay value;

[0102] The pulling calibration module 602 is used to down-mix the local oscillator signal to obtain a low-frequency signal, and calculate the pulling energy of the low-frequency signal;

[0103] The digitally controlled delay module 603 is used to generate a delay value-traction energy function according to the delay value and the traction energy, and determine a target delay value for calibration according to the delay traction function; and calibrate the delay on the transmitting circuit by using the target delay value to reduce the traction of the voltage-controlled oscillator.

[0104] In the following, in conjunction with specific embodiments, each component of the voltage-controlled oscillator pulling calibration device and a specific workflow are described respectively:

[0105] The voltage-controlled oscillator 601 is used to obtain a local oscillation signal output by a voltage-controlled oscillator in a transmitting circuit according to a preset delay value.

[0106] In the embodiment of the present invention, the transmitting circuit is a circuit at the transmitting end of a direct frequency conversion transmitter; a direct frequency conversion transmitter is a radio communication device that uses direct frequency conversion technology to achieve signal transmission and can directly convert the input signal to the baseband frequency without the need for intermediate frequency or other types of frequency conversion.

[0107] In the embodiment of the present invention, a voltage-controlled oscillator (VCO) is an electronic device whose output frequency can be adjusted by an input voltage; the voltage-controlled oscillator is usually composed of an oscillation circuit and a control circuit, the oscillation circuit is responsible for generating a high-frequency signal, and the control circuit is used to adjust the frequency of the signal. In a voltage-controlled oscillator, when the input voltage changes, the frequency of the oscillator will also change accordingly; when the input voltage increases, the frequency of the oscillator will also increase; when the input voltage decreases, the frequency of the oscillator will also decrease.

[0108] Specifically, in the embodiment of the present invention, the voltage-controlled oscillator can be set to work at a multiple of the carrier frequency; when the input voltage is adjusted to a specific value, the output frequency of the oscillator will be an integer multiple of the carrier frequency. For example, if the carrier frequency is 100MHz, and the voltage-controlled oscillator is set to work at a multiple, then under a specific input voltage, the output frequency of the oscillator may be 200MHz, 300MHz, 400MHz, etc., and the frequency modulation of the output frequency can be achieved by controlling the input voltage of the voltage-controlled oscillator.

[0109] In an embodiment of the present invention, a local oscillator signal passes through an inverter having variable resistors on both the power supply and the ground. By controlling the size of the resistor (the number of resistors that are turned on are controlled by a digital switch), the current size and swing of the inverter are changed, thereby controlling the size of the delay of the local oscillator signal that has passed through the inverter to determine different delay values.

[0110] In the embodiment of the present invention, the local oscillator signal in the transmitting circuit is generated by a phase-locked loop (PLL), a voltage-controlled oscillator, a frequency divider and other modules. In the present invention, the local oscillator signal is selected to be drawn from the voltage-controlled oscillator end, so that the energy of the obtained local oscillator signal is pure, and no attenuation or nonlinear influence is generated, so that the signal-to-noise ratio of the local oscillator signal is relatively high. If the signal is drawn from the frequency divider, the signal-to-noise ratio of the local oscillator signal will be reduced due to a certain attenuation effect, which is more complicated and less effective.

[0111] The pulling calibration module 602 is used to down-mix the local oscillator signal to obtain a low-frequency signal, and calculate the pulling energy of the low-frequency signal.

[0112] In an embodiment of the present invention, the traction calibration module includes a mixer, a filter, a digital-to-analog converter, and a digital circuit. The local oscillator signal output by the voltage-controlled oscillator (represented as VCO in the figure) is down-mixed by the mixer and the frequency is reduced by the filter, and then input into the digital-to-analog converter and the digital circuit for conversion. The converted signal is Fourier transformed to obtain the traction energy.

[0113] In the embodiment of the present invention, when the pulling calibration module performs the step of down-mixing the local oscillator signal to obtain a low-frequency signal, it is specifically used to:

[0114] Acquire a local oscillator signal, and perform calculations based on the local oscillator signal and the local oscillator signal to obtain an intermediate frequency signal;

[0115] The intermediate frequency signal is subjected to denoising and enhancement processing to obtain a low frequency signal.

[0116] In an embodiment of the present invention, the local oscillator signal and the local oscillator signal can be multiplied by a mixer to obtain two output signals: an intermediate frequency signal and a sum frequency signal. The difference frequency signal refers to the frequency of the local oscillator signal minus the frequency of the local oscillator signal. After filtering and amplification, the signal can extract the required information; the sum frequency signal refers to the frequency of the local oscillator signal plus the frequency of the local oscillator signal, which is called a radio frequency signal. This signal is usually filtered out or reduced to a lower amplitude to avoid interference with the system; the intermediate frequency signal is then separated from the product by a filter to filter out high-order spurious signals; finally, the intermediate frequency signal can be further processed, amplified, demodulated, etc. to obtain a low-frequency signal.

[0117] In an embodiment of the present invention, when executing the step of calculating the traction energy of the low-frequency signal, the traction calibration module is specifically used to:

[0118] Performing digital-to-analog conversion on the low-frequency signal to obtain a digital signal;

[0119] Perform Fourier transform on the digital signal to obtain the pulling energy.

[0120] The digitally controlled delay module 603 is used to generate a delay value-traction energy function according to the delay value and the traction energy, and determine a target delay value for calibration according to the delay traction function; and calibrate the delay on the transmitting circuit by using the target delay value to reduce the traction of the voltage-controlled oscillator.

[0121] In the embodiment of the present invention, the interference signal that causes the transmitting circuit to generate traction is very close to the operating frequency of the voltage-controlled oscillator. Assuming that both frequencies are 4.8G, they can be understood as two 4.8G sinusoidal signals. There is a phase relationship between the two sinusoidal signals. If the phase is 0, the two are in the same direction, and the superposition can amplify the energy of the voltage-controlled oscillation. If the phase is 180, the two are in opposite directions, and the superposition can weaken the energy of the voltage-controlled oscillation. The optimal delay can be determined through the relationship between the delay size and the traction energy, thereby generating the minimum traction value.

[0122] In the embodiment of the present invention, when the digital control delay module executes the step of generating a delay value-traction energy function according to the delay value and the traction energy, it is specifically used to:

[0123] Acquire different delay values ​​and traction energies corresponding to different delay values;

[0124] Function fitting is performed according to the delay value and the traction energy to obtain the delay value-traction energy function.

[0125] In an embodiment of the present invention, by traversing different delay values, a function of the delay value and the voltage-controlled oscillator traction energy is obtained, and then the optimal delay value, that is, the target delay value, is obtained; specifically, the target delay value can be the delay value corresponding to the maximum traction energy.

[0126] In an embodiment of the present invention, the phase corresponding to the target delay value is used to minimize the traction caused by the transmission signal emitted by the transmitting antenna on the voltage-controlled oscillator, and the phase relationship corresponding to the target delay value can reduce the traction between the transmission signal and the spectrum signal of the voltage-controlled oscillator.

[0127] like Figure 7 , which is a schematic diagram of the structure of a transmitter device provided by an embodiment of the present invention. The voltage controlled oscillator traction calibration device may include a voltage controlled oscillator 601, a traction calibration module 602, a digital control delay module 603, a mixer 604, a power amplifier 605, and a transmitting antenna 606.

[0128] In an embodiment of the present invention, after the voltage-controlled oscillator obtains the local oscillator signal output by the voltage-controlled oscillator in the transmitting circuit according to a preset delay value, the local oscillator signal is divided to obtain a divided frequency signal; a single-tone signal is obtained, and the single-tone signal and the divided frequency signal are up-mixed through the above-mentioned mixer to obtain a mixed signal; after the mixed signal is input into the power amplifier, a transmitting signal is obtained, and the transmitting signal is transmitted through the above-mentioned transmitting antenna.

[0129] In the embodiment of the present invention, the working principle of the transmitting circuit is: the baseband signal (low frequency) is moved to the carrier frequency and finally transmitted; the local oscillator signal after frequency division is the carrier signal in the transmitting system, and its main function is to move the baseband signal carrying useful information to the channel (specific frequency) specified by the protocol.

[0130] In an embodiment of the present invention, the baseband can generate a single-tone signal of a specific frequency according to the bandwidth of the phase-locked loop; the single-tone signal includes an I-channel signal and a Q-channel signal, and the mixer multiplies the frequency-divided signal with the I-channel signal and the Q-channel signal to obtain a mixed signal; the local oscillator signal is mixed with the I-channel and Q-channel signals from the baseband through the mixer, and then output to the power amplifier, which is usually used in a communication system with a modulation method of direct sequence spread spectrum. In this process, the local oscillator signal is multiplied and mixed with the I-channel and Q-channel signals to generate signals with different frequency components; these components include a signal with a frequency of zero (DC component), a signal with a frequency of the local oscillator frequency (up-conversion component), and a signal with a frequency of an increment / decrement of the local oscillator frequency (down-conversion component).

[0131] Furthermore, the above-mentioned mixed signal is input into a power amplifier for processing. Due to the nonlinear characteristics of the power amplifier, it may generate other nonlinear components, such as harmonics and intermodulation components. These nonlinear components may interfere with the local oscillator frequency and other frequency signals. In order to reduce interference propagation, a filter can be added before the power amplifier to suppress the nonlinear components.

[0132] In the embodiment of the present invention, a calibration process is completed by transmitting a single-tone signal of a specific frequency and then extracting a corresponding local oscillator signal from the voltage-controlled oscillator end for energy collection and calculation. If the spectrum of the modulated signal is transmitted, a section of energy needs to be integrated, which is relatively simple with a single-tone signal. Moreover, a specific frequency can be selected for the single-tone signal, and according to the bandwidth of the phase-locked loop at this time, the pulling effect generated by this specific frequency is maximized to improve the signal-to-noise ratio of the spectrum signal.

[0133] like Figure 8 FIG. 1 is a schematic diagram of the structure of an electronic device for implementing a voltage-controlled oscillator pulling calibration method provided by an embodiment of the present invention.

[0134] The electronic device 700 may include a processor 701 , a memory 702 , a communication bus 703 , and a communication interface 704 , and may also include a computer program stored in the memory 702 and executable on the processor 701 , such as a voltage-controlled oscillator pulling calibration program.

[0135] In some embodiments, the processor 701 may be composed of an integrated circuit, for example, a single packaged integrated circuit, or a plurality of packaged integrated circuits with the same or different functions, including one or more central processing units (CPUs), microprocessors, digital processing chips, graphics processors, and combinations of various control chips, etc. The processor 701 is the control core (ControlUnit) of the electronic device, and uses various interfaces and lines to connect various components of the entire electronic device, and executes or executes programs or modules stored in the memory 702 (for example, executing a calibration program for voltage-controlled oscillator pulling, etc.), and calls data stored in the memory 702 to execute various functions of the electronic device and process data.

[0136] The memory 702 includes at least one type of readable storage medium, and the readable storage medium includes a flash memory, a mobile hard disk, a multimedia card, a card-type memory (for example, an SD or DX memory, etc.), a magnetic memory, a disk, an optical disk, etc. In some embodiments, the memory 702 may be an internal storage unit of an electronic device, such as a mobile hard disk of the electronic device. In other embodiments, the memory 702 may also be an external storage device of an electronic device, such as a plug-in mobile hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), etc. equipped on the electronic device. Further, the memory 702 may also include both an internal storage unit of the electronic device and an external storage device. The memory 702 may not only be used to store application software and various types of data installed in the electronic device, such as the code of the calibration program pulled by the voltage-controlled oscillator, but also be used to temporarily store data that has been output or is to be output.

[0137] The communication bus 703 may be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc. The bus is configured to realize connection and communication between the memory 702 and at least one processor 701, etc.

[0138] The communication interface 704 is used for communication between the above-mentioned electronic device and other devices, including a network interface and a user interface. Optionally, the network interface may include a wired interface and / or a wireless interface (such as a WI-FI interface, a Bluetooth interface, etc.), which is generally used to establish a communication connection between the electronic device and other electronic devices. The user interface may be a display (Display), an input unit (such as a keyboard (Keyboard)), and optionally, the user interface may also be a standard wired interface, a wireless interface. Optionally, in some embodiments, the display may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, and an OLED (Organic Light-Emitting Diode, organic light-emitting diode) touch device, etc. Among them, the display may also be appropriately referred to as a display screen or a display unit, which is used to display information processed in the electronic device and to display a visual user interface.

[0139] Figure 6 Only an electronic device with components is shown, and those skilled in the art will understand that Figure 6The structure shown does not constitute a limitation on the electronic device 700 , and may include fewer or more components than shown in the figure, or combine certain components, or arrange the components differently.

[0140] For example, although not shown, the electronic device may also include a power source (such as a battery) for supplying power to each component. Preferably, the power source may be logically connected to the at least one processor 701 through a power management device, so that the power management device can realize functions such as charging management, discharging management, and power consumption management. The power source may also include any components such as one or more DC or AC power sources, recharging devices, power failure detection circuits, power converters or inverters, and power status indicators. The electronic device may also include a variety of sensors, Bluetooth modules, Wi-Fi modules, etc., which will not be repeated here.

[0141] It should be understood that the embodiment is for illustration only and the scope of the patent application is not limited to this structure.

[0142] The voltage-controlled oscillator pull-in calibration program stored in the memory 702 in the electronic device 700 is a combination of multiple instructions, and when executed in the processor 701, it can achieve:

[0143] Acquire a local oscillator signal output by a voltage-controlled oscillator in a transmitting circuit according to a preset delay value;

[0144] Down-mixing the local oscillator signal to obtain a low-frequency signal, and calculating the pulling energy of the low-frequency signal;

[0145] generating a delay value-traction energy function according to the delay value and the traction energy, and determining a target delay value for calibration according to the delay traction function;

[0146] The delay on the transmitting circuit is calibrated by the target delay value to reduce the pulling of the voltage controlled oscillator.

[0147] Specifically, the specific implementation method of the processor 701 for the above instructions can refer to the description of the relevant steps in the corresponding embodiment of the accompanying drawings, which will not be repeated here.

[0148] Furthermore, if the module / unit integrated in the electronic device 700 is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. The computer-readable storage medium can be volatile or non-volatile. For example, the computer-readable medium may include: any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a mobile hard disk, a magnetic disk, an optical disk, a computer memory, and a read-only memory (ROM).

[0149] The present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor of an electronic device, the computer program can implement:

[0150] Acquire a local oscillator signal output by a voltage-controlled oscillator in a transmitting circuit according to a preset delay value;

[0151] Down-mixing the local oscillator signal to obtain a low-frequency signal, and calculating the pulling energy of the low-frequency signal;

[0152] generating a delay value-traction energy function according to the delay value and the traction energy, and determining a target delay value for calibration according to the delay traction function;

[0153] The delay on the transmitting circuit is calibrated by the target delay value to reduce the pulling of the voltage controlled oscillator.

[0154] In the several embodiments provided by the present invention, it should be understood that the disclosed devices, apparatuses and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of the modules is only a logical function division, and there may be other division methods in actual implementation.

[0155] The modules described as separate components may or may not be physically separated, and the components shown as modules may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0156] In addition, each functional module in each embodiment of the present invention may be integrated into one processing unit, each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of hardware plus software functional modules.

[0157] It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention.

[0158] Therefore, no matter from which point of view, the embodiments should be regarded as illustrative and non-restrictive, and the scope of the present invention is limited by the appended claims rather than the above description, so it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any attached figure mark in the claims should not be regarded as limiting the claims involved.

[0159] In addition, it is clear that the word "comprising" does not exclude other units or steps, and the singular does not exclude the plural. Multiple units or devices stated in the system claim can also be implemented by one unit or device through software or hardware. The words first, second, etc. are used to indicate names, and do not indicate any particular order.

[0160] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention.

Claims

1. A voltage controlled oscillator pull-in calibration method, characterized in that: The method comprises: Acquire a local oscillator signal output by a voltage-controlled oscillator in a transmitting circuit according to a preset delay value; Down-mixing the local oscillator signal to obtain a low-frequency signal, and calculating the pulling energy of the low-frequency signal; generating a delay value-traction energy function according to the delay value and the traction energy, and determining a target delay value for calibration according to the delay traction function; The delay on the transmitting circuit is calibrated by the target delay value to reduce the pulling of the voltage controlled oscillator.

2. The voltage controlled oscillator pulling calibration method according to claim 1, characterized in that: The step of down-mixing the local oscillator signal to obtain a low-frequency signal includes: Acquire a local oscillator signal, and perform calculations based on the local oscillator signal and the local oscillator signal to obtain an intermediate frequency signal; The intermediate frequency signal is subjected to denoising and enhancement processing to obtain a low frequency signal.

3. The voltage controlled oscillator pulling calibration method according to claim 1, characterized in that: The calculating the traction energy of the low-frequency signal comprises: Performing digital-to-analog conversion on the low-frequency signal to obtain a digital signal; Perform Fourier transform on the digital signal to obtain the pulling energy.

4. The voltage controlled oscillator pulling calibration method according to claim 1, characterized in that: The generating a delay value-traction energy function according to the delay value and the traction energy comprises: Acquire different delay values ​​and traction energies corresponding to different delay values; Function fitting is performed according to the delay value and the traction energy to obtain the delay value-traction energy function.

5. The voltage controlled oscillator pulling calibration method according to claim 1, characterized in that: After obtaining the local oscillation signal output by the voltage-controlled oscillator in the transmitting circuit according to the preset delay value, the method further includes: Performing frequency division on the local oscillator signal to obtain a frequency-divided signal; Acquire a single tone signal, and up-mix the single tone signal and the frequency-divided signal to obtain a mixed signal; After the mixed signal is input into a power amplifier, a transmission signal is obtained.

6. The voltage controlled oscillator pulling calibration method according to claim 5, characterized in that: The obtaining of the single tone signal comprises: Get the bandwidth of the phase-locked loop; The baseband generates a single tone signal of a specific frequency according to the bandwidth.

7. The voltage controlled oscillator pulling calibration method according to claim 5, characterized in that: The step of up-mixing the single tone signal and the frequency-divided signal to obtain a mixed signal comprises: Determine an I-channel signal and a Q-channel signal according to the single-tone signal; The frequency-divided signal is multiplied by the I-path signal and the Q-path signal respectively to obtain a mixed signal.

8. A calibration device for voltage-controlled oscillator pulling, characterized in that: The calibration device comprises: A voltage-controlled oscillator, used to obtain a local oscillation signal output by a voltage-controlled oscillator in a transmitting circuit according to a preset delay value; A pulling calibration module, used for down-mixing the local oscillator signal to obtain a low-frequency signal, and calculating the pulling energy of the low-frequency signal; A digitally controlled delay module is used to generate a delay value-traction energy function according to the delay value and the traction energy, determine a target delay value for calibration according to the delay traction function; and calibrate the delay on the transmitting circuit by using the target delay value to reduce the traction of the voltage-controlled oscillator.

9. An electronic device, characterized in that: The electronic device comprises: at least one processor; and, a memory communicatively connected to the at least one processor; wherein, The memory stores a computer program executable by the at least one processor, wherein the computer program is executed by the at least one processor so as to enable the at least one processor to perform the steps of the voltage-controlled oscillator pulling calibration method according to any one of claims 1 to 7.

10. A transmitter device, characterized in that: The transmitter device comprises: a mixer, a power amplifier, a transmitting antenna and a voltage-controlled oscillator pulling calibration device as claimed in claim 8.

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