Tuner calibration system for improving impedance detection precision and control method thereof

Abstract

The invention provides a tuner calibration system and method for improving impedance detection precision. The system comprises a radio frequency integrated circuit, a coupler, a tuner, a calibration load and a correction load. The radio frequency integrated circuit is used for obtaining an off-line reflection coefficient of an antenna side, controlling the calibration switch to be switched and connected to the calibration load, obtaining a reflection coefficient of the calibration load through the coupler, obtaining a conversion parameter of the reflection coefficient based on the off-line reflection coefficient of the antenna side and the reflection coefficient of the calibration load, obtaining a real-time reflection coefficient of the antenna side, and outputting the real-time reflection coefficient of the antenna side. The calibration switch is controlled to be switched and connected to the correction load, the reflection coefficient of the correction load is obtained through the coupler, the antenna reflection coefficient is obtained based on the reflection coefficient of the correction load and the conversion parameter, and the correction factor is obtained based on the antenna reflection coefficient; and performing error compensation on the real-time reflection coefficient of the antenna side based on the correction factor to obtain the compensated reflection coefficient of the antenna side. According to the invention, the impedance detection precision can be improved, and the tuning accuracy can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of radio frequency technology, in particular to a tuner calibration system for improving impedance detection accuracy and a control method thereof. BACKGROUND

[0002] In the field of radio frequency, power transmission performance is a key indicator to measure system performance, therefore, it is very important to ensure maximum power transmission. Terminal equipment is prone to mismatching state with the change of external environment (such as hand holding, etc.), therefore, in order to ensure that the signal or energy is effectively transmitted from the "signal source" to the "load", it is often necessary to detect the impedance of the radio frequency link to identify the radio frequency state of the radio frequency link and perform corresponding antenna and impedance tuning to improve the performance of the air interface. Impedance detection is usually performed by calculating the reflection coefficient of the antenna side from the reflection coefficient of the feedback side obtained by the coupler, and the conversion of the reflection coefficient of the antenna side and the reflection coefficient of the feedback side involves multiple link radio frequency parameters (for convenience of description, the abc parameter can be taken as an example for illustration), and the detection accuracy of the reflection coefficient of the antenna side depends on the detection accuracy of the abc parameter. In the field of radio frequency, the front-end circuit of the radio frequency link contains multiple components, and the radio frequency parameters of these components will be affected by process accuracy, temperature and frequency dimensions, and there will be a certain amount of fluctuation, therefore, in order to ensure the power transmission performance of the radio frequency link, it is necessary to be able to track the changes in these dimensions in real time. If the above-mentioned abc parameter cannot identify these fluctuations, it will inevitably cause estimation errors in the detection of the reflection coefficient of the antenna side, resulting in incorrect antenna and impedance tuning, thereby affecting the power transmission performance of the radio frequency link.

[0003] The present application relates to the field of radio frequency technology, in particular to a tuner calibration system for improving impedance detection accuracy and a control method thereof. SUMMARY

[0004] The present application provides a tuner calibration system for improving impedance detection accuracy and a control method thereof, which can improve impedance detection accuracy and improve tuning accuracy.

[0005] In a first aspect, the application provides a tuner calibration system for improving impedance detection accuracy, which comprises a radio frequency integrated circuit, a coupler, a tuner, a calibration load and a correction load. One end of the coupler is connected to the radio frequency integrated circuit, the other end of the coupler is connected to one end of the tuner, the other end of the tuner is used to connect to an antenna, one end of the calibration load and the correction load is used to connect to one end of a calibration switch, the other end of the calibration load and the correction load is grounded, and the other end of the calibration switch is connected to the coupler. The radio frequency integrated circuit is used to measure the impedance of the calibration load offline to obtain an offline reflection coefficient on the antenna side, control the calibration switch to switch to connect to the calibration load, and obtain the reflection coefficient of the calibration load through the coupler, and obtain a conversion parameter of the reflection coefficient on the antenna side and the reflection coefficient on the feedback side based on the offline reflection coefficient on the antenna side and the reflection coefficient of the calibration load. Here, the radio frequency integrated circuit can obtain the feedback coefficient on the antenna side by measuring offline by obtaining the impedance of the calibration load, and can calculate the conversion parameter of the reflection coefficient on the antenna side and the reflection coefficient on the feedback side by obtaining the reflection coefficient of the calibration load as the reflection coefficient on the feedback side. It can be understood that the conversion parameter here can be a comprehensive parameter of multiple link radio frequency parameters involved in the conversion of the reflection coefficient on the antenna side and the reflection coefficient on the feedback side. The application can realize real-time calculation of the comprehensive parameter of multiple link radio frequency parameters involved in the conversion of the reflection coefficient on the antenna side and the reflection coefficient on the feedback side by introducing the calibration load, can improve the detection accuracy of the comprehensive parameter of the link radio frequency parameter, and thus can improve the detection accuracy of the radio frequency parameter of the component in the radio frequency link with the dimensional fluctuations of process accuracy, temperature and frequency, and improve the impedance detection accuracy of the radio frequency link. In addition, the radio frequency integrated circuit can also be used to obtain the real-time reflection coefficient on the antenna side, control the calibration switch to switch to connect to the correction load, and obtain the reflection coefficient of the correction load through the coupler, obtain the antenna reflection coefficient based on the reflection coefficient of the correction load and the conversion parameter, and obtain the correction factor based on the antenna reflection coefficient, and perform error compensation on the real-time reflection coefficient on the antenna side based on the correction factor to obtain the compensated reflection coefficient on the antenna side. Here, the compensated reflection coefficient on the antenna side is used to obtain the configuration of impedance tuning and / or aperture tuning, and the tuner can realize impedance tuning and / or aperture tuning based on the configuration of impedance tuning and / or aperture tuning. In the application, the calculation accuracy of the configuration of impedance tuning and / or aperture tuning can be improved by compensating the real-time reflection coefficient on the antenna side, so as to improve the accuracy of impedance tuning and / or aperture tuning, improve the impedance detection accuracy, and have simple structure and strong applicability.

[0006] In combination with the first aspect, in a first possible implementation manner, the calibration load includes at least three first loads in parallel, and the correction load includes at least two second loads in parallel. In this application, the independent arrangement of the calibration load and the correction load can improve the operation convenience of the switching control of the calibration switch during the detection of the reflection coefficient of the feedback side, and is simple and applicable.

[0007] In combination with the first aspect, in a second possible implementation manner, the calibration load includes at least three first loads in parallel; the tuner calibration system further includes at least one phase shifter, at least one first load in the calibration load is used as at least one correction load, and the at least one first load in the calibration load is used to connect one end of the calibration switch in series with the phase shifter as at least one correction load. In this application, the addition of the phase shifter can realize the partial multiplexing of the calibration load and the correction load, reduce the number of components of the system, improve the stability of the system, and enhance the structural diversity of the system, and is more applicable.

[0008] In combination with the first aspect, in a third possible implementation manner, the tuner calibration system includes at least two phase shifters and a target load, the target load is used as one calibration load or one correction load, and the target load is used to connect one end of the calibration switch in series with one phase shifter as one calibration load or one correction load. In this application, the addition of the phase shifter can realize the complete multiplexing of the calibration load and the correction load while reducing the number of loads, thereby reducing the number of components of the system, improving the stability of the system, and enhancing the structural diversity of the system, and is simple and applicable.

[0009] In combination with any one of the first aspect to the third possible implementation manner of the first aspect, in a fourth possible implementation manner, the calibration load and the correction load are integrated in the tuner. In this application, the integration of the calibration load and the correction load in the tuner can simplify the circuit structure of the system, reduce the volume of the system, and thereby improve the structural stability of the system.

[0010] In combination with any one of the first aspect to the fourth possible implementation manner of the first aspect, in a fifth possible implementation manner, the radio frequency integrated circuit is used to measure the impedance of the three calibration loads offline to obtain three groups of offline reflection coefficients of the antenna side, control the calibration switch to be switched to be connected to the three calibration loads, and obtain three groups of reflection coefficients of the three calibration loads through the coupler respectively, take the three groups of reflection coefficients of the three calibration loads as the reflection coefficients of the feedback side, and obtain the conversion parameters abc of the reflection coefficients of the antenna side and the reflection coefficients of the feedback side based on the three groups of offline reflection coefficients of the antenna side and the three groups of reflection coefficients, wherein the conversion parameters abc satisfy:

[0011]

[0012] wherein, Γ in is the reflection coefficient of the antenna side, Γ mrx is the reflection coefficient of the feedback side. In the present application, the calculation of the three parameters of the conversion parameter abc of the reflection coefficient of the antenna side and the reflection coefficient of the feedback side is realized by three calibration loads, which is simple in operation and strong in applicability.

[0013] With reference to the fifth possible implementation manner of the first aspect, in a sixth possible implementation manner, the radio frequency integrated circuit is configured to control the calibration switch to switch to connect to at least two correction loads and obtain at least two groups of reflection coefficients of the at least two correction loads through the coupler, take the at least two groups of reflection coefficients of the at least two correction loads as the reflection coefficient of the feedback side, obtain at least two groups of antenna reflection coefficients in combination with the conversion parameter, and obtain the correction factor based on the at least two groups of antenna reflection coefficients. Here, the correction factor includes a mean value of the at least two groups of antenna reflection coefficients, or a value of a center of a circle in which the at least two groups of antenna reflection coefficients are located. In the present application, the calculation of the correction factor is realized by introducing the correction load, which is simple in operation and strong in applicability.

[0014] In a second aspect, the application provides a control method for a tuner calibration system for improving impedance detection accuracy. The control method is applied to a radio frequency integrated circuit in the tuner calibration system, which further comprises a coupler, a tuner, a calibration load, and a correction load. One end of the coupler is connected to the radio frequency integrated circuit, the other end of the coupler is connected to one end of the tuner, the other end of the tuner is used to connect an antenna, one end of the calibration load and the correction load is used to connect one end of a calibration switch, the other end of the calibration load and the correction load is grounded, and the other end of the calibration switch is connected to the coupler. In the application, the method based on the radio frequency integrated circuit can include offline measurement of the impedance of the calibration load to obtain an offline reflection coefficient on the antenna side, control of the calibration switch to switch to connect to the calibration load and obtain the reflection coefficient of the calibration load through the coupler, obtaining of a conversion parameter of the reflection coefficient on the antenna side and the reflection coefficient on the feedback side based on the offline reflection coefficient on the antenna side and the reflection coefficient of the calibration load; obtaining of a real-time reflection coefficient on the antenna side, control of the calibration switch to switch to connect to the correction load and obtain the reflection coefficient of the correction load through the coupler, obtaining of an antenna reflection coefficient based on the reflection coefficient of the correction load and the conversion parameter, obtaining of a correction factor based on the antenna reflection coefficient, error compensation of the real-time reflection coefficient on the antenna side based on the correction factor to obtain a compensated reflection coefficient on the antenna side, and obtaining of impedance tuning and / or aperture tuning configuration based on the compensated reflection coefficient on the antenna side. In the application, the introduction of the calibration load can realize real-time calculation of the comprehensive parameter of the multiple link radio frequency parameters involved in the conversion of the reflection coefficient on the antenna side and the reflection coefficient on the feedback side, improve the detection accuracy of the comprehensive parameter of the link radio frequency parameters, and thus improve the detection accuracy of the radio frequency parameters of the components in the radio frequency link with respect to process accuracy, temperature, and frequency dimensions, and improve the impedance detection accuracy of the radio frequency link. In addition, the introduction of the correction load can realize compensation of the real-time reflection coefficient on the antenna side, which can improve the calculation accuracy of the impedance tuning and / or aperture tuning configuration through the compensation of the real-time reflection coefficient on the antenna side, and thus improve the accuracy of the impedance tuning and / or aperture tuning, improve the impedance detection accuracy, and have simple structure and strong applicability.

[0015] In combination with the second aspect, in a first possible implementation, the impedance of the calibration load is measured offline to obtain the offline reflection coefficient on the antenna side, the impedance of the three calibration loads is measured offline to obtain three sets of offline reflection coefficients on the antenna side when the calibration switch is controlled to switch to connect to the calibration load and the reflection coefficient of the calibration load is obtained through the coupler, and the calibration switch is controlled to switch to connect to the three calibration loads respectively and three sets of reflection coefficients of the three calibration loads are obtained through the coupler respectively. The three sets of reflection coefficients of the three calibration loads can be used as the reflection coefficient on the feedback side when the conversion parameters of the reflection coefficient on the antenna side and the reflection coefficient on the feedback side are obtained based on the offline reflection coefficient on the antenna side and the reflection coefficient of the calibration load, and the conversion parameters abc of the reflection coefficient on the antenna side and the reflection coefficient on the feedback side are obtained based on the three sets of offline reflection coefficients on the antenna side and the three sets of reflection coefficients; wherein the conversion parameters abc satisfy:

[0016]

[0017] wherein, Γ in is the reflection coefficient on the antenna side, and Γ mrx is the reflection coefficient on the feedback side.

[0018] In combination with the first possible implementation of the second aspect, in a second possible implementation, the calibration switch is controlled to switch to connect to the correction load and the reflection coefficient of the correction load is obtained through the coupler when the calibration switch is controlled to switch to connect to the correction load and the reflection coefficient of the correction load is obtained through the coupler, and the calibration switch is controlled to switch to connect to at least two correction loads respectively and at least two sets of reflection coefficients of the at least two correction loads are obtained through the coupler. The at least two sets of reflection coefficients of the at least two correction loads can be used as the reflection coefficient on the feedback side when the antenna reflection coefficient is obtained based on the reflection coefficient of the correction load and the conversion parameters, and the correction factor is obtained based on the antenna reflection coefficient, the at least two sets of antenna reflection coefficients are obtained in combination with the conversion parameters, and the correction factor is obtained based on the at least two sets of antenna reflection coefficients. Herein, the correction factor includes the mean value of the at least two sets of antenna reflection coefficients, or the value of the center of the circle in which the at least two sets of antenna reflection coefficients are located. In the present application, the calculation of the correction factor is realized by introducing the correction load, which is simple to operate and has strong applicability. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a structural schematic diagram of a tuner calibration system for improving impedance detection precision provided by the present application;

[0020] Figure 2 is a structural schematic diagram of a calibration load and a correction load provided by the present application;

[0021] Figure 3 is another structural schematic diagram of a calibration load and a correction load provided by the present application;

[0022] Figure 4Another structural schematic diagram of the calibration load and correction load provided in this application;

[0023] Figure 5 This is a flow chart of a control method for a tuner calibration system for improving impedance detection accuracy provided by the present application. DETAILED DESCRIPTION

[0024] The tuner calibration system and control method for improving impedance detection accuracy provided in the present application can be applied to radio frequency links. The front-end circuit of the radio frequency link may include but is not limited to components such as couplers, matching networks, switches, printed circuit board (PCB) traces or flexible printed circuit boards (FPC). The fluctuations of the radio frequency parameters of these components can be tracked, thereby improving the detection accuracy of the reflection coefficient on the antenna side of the radio frequency circuit, and further improving the impedance detection accuracy and the tuning accuracy of the radio frequency link. The system has a simple structure and strong applicability.

[0025] See also Figure 1 , Figure 1 Schematic diagram of the structure of the tuner calibration system for improving impedance detection accuracy provided by this application. Figure 1 As shown, the tuner calibration system for improving impedance detection accuracy provided by the present application includes a radio frequency integrated circuit 10, a coupler 20, a tuner 30, a calibration load 41 and a correction load 42, wherein one end of the coupler 20 is connected to the radio frequency integrated circuit 10, the other end of the coupler 20 is connected to one end of the tuner 30, the other end of the tuner 30 is used to connect to the antenna, and one end of the calibration load 41 and the correction load 42 is used to connect to the calibration switch ( Figure 1 One end of the calibration load 41 and the correction load 42 is grounded (not shown). Figure 1 (not shown), the other end of the calibration switch is connected to the coupler 20. Optionally, the tuner calibration system may further include a power amplifier 50, which may be determined according to the actual application scenario and is not limited here. Figure 1It should be understood that the calibration load 41 and the correction load 42 can also be arranged outside the tuner, and the specific arrangement can be determined according to the actual application scenario, which is not limited herein. In the present application, the calibration load 41 and the correction load 42 integrated in the tuner can simplify the circuit structure of the system and reduce the volume of the system, thereby improving the structural stability of the system. The calibration load 41 and the correction load 42 can also be arranged outside the tuner, which is flexible and has strong applicability. The correction load 42 can be independent or associated with the calibration load 41. In other words, the calibration load 41 and the correction load 42 can be independent of each other, partially multiplexed, or fully multiplexed, and the specific arrangement can be determined according to the actual application scenario, which is not limited herein. The calibration load 41 can include three or more, and the correction load 42 can include two or more. The calibration load can be used to obtain the calibration coefficient of the antenna side, the correction load can be used to calculate the correction error of the calibration coefficient of the antenna side, and the correction error can be compensated to the calibration coefficient of the antenna side to obtain the final calculation result as the reflection coefficient of the antenna side, thereby improving the detection accuracy of the reflection system of the antenna side.

[0026] In some possible embodiments, the radio frequency integrated circuit 10 can measure the impedance of the calibration load 41 offline to obtain the offline reflection coefficient of the antenna side. Here, it should be understood that the offline reflection coefficient of the antenna side is the reflection coefficient of the antenna side obtained by offline measurement. After obtaining the offline reflection coefficient of the antenna side, the radio frequency integrated circuit 10 can control the calibration switch to switch to be connected to the calibration load 41 and obtain the reflection coefficient of the calibration load 41 through the coupler 20, and obtain the conversion parameter of the reflection coefficient of the antenna side and the reflection coefficient of the feedback side based on the offline reflection coefficient of the antenna side and the reflection coefficient of the calibration load 41. Here, the radio frequency integrated circuit 10 can obtain the offline measurement of the feedback coefficient of the antenna side by obtaining the impedance of the calibration load 41, and can calculate the conversion parameter of the reflection coefficient of the antenna side and the reflection coefficient of the feedback side by obtaining the reflection coefficient of the calibration load 41 as the reflection coefficient of the feedback side. It should be understood that the conversion parameter herein can be a comprehensive parameter of multiple link radio frequency parameters involved in the conversion of the reflection coefficient of the antenna side and the reflection coefficient of the feedback side. In the radio frequency link, the impedance detection method is to calculate the reflection coefficient of the antenna side by the reflection coefficient of the feedback side obtained by the coupler. The corresponding conversion relationship is shown in the following formula (1), where Γ in and Γ mrx are the reflection coefficients of the antenna side and the feedback side, respectively, and abc is a comprehensive value of the radio frequency link S parameter (i.e., a radio frequency parameter), that is, the abc parameter is a value of the comprehensive effect of multiple S parameters, which represents the link characteristics.

[0027]

[0028] As can be seen from the above formula (1), three equations can be constructed by testing three groups of data, and the value of abc can be obtained through the above three equations.

[0029] In some possible embodiments, referring to Figure 2 , Figure 2 A structural diagram of a calibration load and a correction load provided in the present application is shown in Figure 1 The system shown can include at least three calibration loads, as shown in Figure 2 One end of the at least three calibration loads can be connected in parallel and grounded, and the other end of the calibration load is used to connect one end of a calibration switch, and the other end of the calibration switch is connected to a calibration position. It can be understood that in the radio frequency link, the radio frequency parameters of the components included in the front-end circuit, such as the coupler, the matching network, the switch, the circuit board trace, or the flexible circuit board, etc. can be affected by the process accuracy, the temperature, and the frequency, etc. dimensions, and there can be a certain order of fluctuation, therefore, to ensure the power transmission performance of the radio frequency link, it is necessary to track the changes in these dimensions in real time, therefore, the radio frequency parameters of these components can need to be calibrated, and therefore the calibration position connected by the calibration switch can include but is not limited to the connection end of the components such as the coupler, the matching network, the switch, the circuit board trace, or the flexible circuit board, etc. For convenience of description, the other end of the calibration switch is connected to the coupler 20 as an example for illustration.

[0030] In some possible embodiments, the radio frequency integrated circuit 10 can measure the impedance of the three calibration loads 41 offline to obtain three groups of offline reflection coefficients on the antenna side, control the calibration switch to switch to be connected to the three calibration loads respectively, and obtain three groups of reflection coefficients of the three calibration loads 41 through the coupler 20 respectively, take the three groups of reflection coefficients of the three calibration loads 41 as the reflection coefficients on the feedback side, and obtain the conversion parameters abc of the reflection coefficients on the antenna side and the reflection coefficients on the feedback side based on the three groups of offline reflection coefficients on the antenna side and the above three groups of reflection coefficients; wherein the conversion parameters abc satisfy:

[0031]

[0032] wherein, Γ in is the reflection coefficient on the antenna side, Γ mrxThe feedback side reflection coefficient. In the present application, the three parameters of the conversion parameter abc of the antenna side reflection coefficient and the feedback side reflection coefficient are calculated by three calibration loads, the operation is simple, and the applicability is strong. Here. The radio frequency integrated circuit 10 measures the impedance of the three calibration loads 41 offline to obtain three sets of offline reflection coefficients of the antenna side. The offline measurement methods that can be adopted include but are not limited to the network measurement, and the specific determination can be made according to the actual application scene, which is not limited here. In the present application, the real-time calculation of the comprehensive parameters (i.e. the above-mentioned abc parameters) of the multiple link radio frequency parameters involved in the conversion of the antenna side reflection coefficient and the feedback side reflection coefficient can be realized by introducing the calibration load 41, which can improve the detection accuracy of the comprehensive parameters of the link radio frequency parameters, thereby improving the detection accuracy of the radio frequency parameters of the components in the radio frequency link with the process precision, temperature and frequency dimensions. Fluctuation, improve the impedance detection accuracy of the radio frequency link.

[0033] In some feasible embodiments, after the radio frequency integrated circuit 10 obtains the above-mentioned abc parameters, the compensation of the antenna side reflection coefficient can be realized based on the abc parameters and the reflection coefficient of the correction load 42, which can further improve the detection accuracy of the antenna side reflection coefficient. Please refer again to Figure 2 As Figure 2 shown, the system provided by the present application can include at least two correction loads, one end of the at least two correction loads can be connected in parallel and grounded, and the other end of the correction load is used to connect one end of the calibration switch. For convenience of description, two correction loads or three correction loads will be taken as examples for example description. In the present application, the radio frequency integrated circuit 10 can obtain the real-time reflection coefficient of the antenna side, control the calibration switch to switch to connect to the correction load 42, and obtain the reflection coefficient of the correction load 42 through the coupler, obtain the antenna reflection coefficient based on the reflection coefficient of the correction load 42 and the conversion parameter, and obtain the correction factor based on the antenna reflection coefficient. The real-time reflection coefficient of the antenna side is compensated based on the correction factor to obtain the above-mentioned antenna side compensated reflection coefficient. Here, the antenna side compensated reflection coefficient is used to obtain the configuration of impedance tuning and / or aperture tuning, and the tuner 30 can realize impedance tuning and / or aperture tuning based on the above-mentioned impedance tuning and / or aperture tuning configuration. In the present application, the calculation accuracy of the impedance tuning and / or aperture tuning configuration can be improved by compensating the real-time reflection coefficient of the antenna side, thereby improving the accuracy of the impedance tuning and / or aperture tuning, improving the impedance detection accuracy, and the structure is simple and the applicability is strong.

[0034] In some possible implementation manners, the radio frequency integrated circuit 10 can control the calibration switch to switch to connect to the at least two correction loads 42 respectively, and obtain at least two sets of reflection coefficients of the at least two correction loads 42 through the coupler 20, take the at least two sets of reflection coefficients of the at least two correction loads as the reflection coefficient of the feedback side, obtain at least two sets of antenna reflection coefficients by combining the conversion parameters abc, and obtain the correction factor based on the at least two sets of antenna reflection coefficients. Here, the correction factor includes a mean value of the at least two sets of antenna reflection coefficients, or a value of a center of a circle in which the at least two sets of antenna reflection coefficients are located. In this application, the correction factor can be calculated by introducing the correction load, which is simple to operate and has strong applicability.

[0035] In some possible implementation manners, as shown in Figure 2 , the calibration load 41 includes at least three first loads in parallel, one end of each first load is connected in parallel and grounded, and the other end of each first load is used to connect the calibration switch respectively. It can be understood that the end of each calibration load (i.e. the first load) used to connect the calibration switch can be connected to a fixed end or a contact of the calibration switch. Assuming that the calibration switch is a single-throw multi-throw switch, the calibration switch has one movable contact and multiple fixed contacts, one calibration load can be connected to one fixed contact of the calibration switch, and the radio frequency integrated circuit 10 can control the movable contact of the calibration switch to move to control the calibration switch to switch to connect different calibration loads. The specific implementation can be determined according to the actual application scenario, which is not limited herein. Similarly, the correction load 42 includes at least two second loads in parallel, one end of each second load is connected in parallel and grounded, and the other end of each second load is used to connect the calibration switch respectively. For example, one correction load (i.e. the second load) can be connected to one fixed contact of the calibration switch, and the radio frequency integrated circuit 10 can control the movable contact of the calibration switch to move to control the calibration switch to switch to connect different correction loads 42. Here, the first load and the second load are only used to distinguish the calibration load and the correction load, and do not distinguish the load type and the load function and other load device parameters. The selection of the device type of the calibration load and the correction load can be determined according to the actual application scenario, which is not limited herein, and will not be described below. In this application, the separate calibration load and the correction load can improve the operation convenience of the switching control of the calibration switch when detecting the reflection coefficient of the feedback side, which is simple to operate and has strong applicability.

[0036] In some possible implementation manners, please refer to Figure 3 , Figure 3 for another structural schematic diagram of the calibration load and the correction load provided in this application. As shown in Figure 3 , the calibration load includes at least three first loads in parallel, including but not limited to the calibration load 1, the calibration load 2 and the calibration load 3 as shown in Figure 3 . As shown in Figure 3As shown in the above-mentioned tuner calibration system, at least one phase shifter 43 is further included, and at least one first load (such as the calibration load 3) in the above-mentioned calibration load is used to connect one end of the above-mentioned calibration switch in series with the above-mentioned phase shifter 43 as at least one correction load. Figure 3 As shown in the above-mentioned tuner calibration system, at least one phase shifter 43 is further included, and at least one first load (such as the calibration load 3) in the above-mentioned calibration load is used to connect one end of the above-mentioned calibration switch in series with the above-mentioned phase shifter 43 as at least one correction load. Figure 3 As shown in the above-mentioned tuner calibration system, at least one phase shifter 43 is further included, and at least one first load (such as the calibration load 3) in the above-mentioned calibration load is used to connect one end of the above-mentioned calibration switch in series with the above-mentioned phase shifter 43 as at least one correction load. Figure 3 As shown in the above-mentioned tuner calibration system, at least one phase shifter 43 is further included, and at least one first load (such as the calibration load 3) in the above-mentioned calibration load is used to connect one end of the above-mentioned calibration switch in series with the above-mentioned phase shifter 43 as at least one correction load. For example, in the above-mentioned tuner calibration system, there are three calibration loads and two correction loads, and the first correction load is obtained by using one of the calibration loads and the result obtained by performing 180° phase shift on the calibration load through the phase shifter as the second correction load. The radio frequency integrated circuit 10 obtains the correction factor by calculating the average of the reflection coefficients of the two correction loads, and then compensates the real-time reflection coefficient on the antenna side through the correction factor to obtain the value of the reflection coefficient with higher precision, so as to support the modulator to realize impedance tuning or aperture tuning. In the present application, the addition of the phase shifter can realize the partial multiplexing of the calibration load and the correction load, can reduce the number of components of the system, can enhance the structural diversity of the system while improving the stability of the system, and has stronger applicability.

[0037] In some possible implementation manners, please refer to Figure 4 , Figure 4 Another structural diagram of the calibration load and the correction load provided in the present application is shown in the figure. Figure 4 As shown in the above-mentioned tuner calibration system, at least two phase shifters (such as the phase shifter 44 and the phase shifter 45) and a target load (such as the calibration load & correction load 40) are included, and the target load is used to connect one end of the above-mentioned calibration switch in series with one of the above-mentioned phase shifters as one of the above-mentioned calibration loads or one of the above-mentioned correction loads. Figure 4 As shown in the above-mentioned tuner calibration system, at least two phase shifters (such as the phase shifter 44 and the phase shifter 45) and a target load (such as the calibration load & correction load 40) are included, and the target load is used to connect one end of the above-mentioned calibration switch in series with one of the above-mentioned phase shifters as one of the above-mentioned calibration loads or one of the above-mentioned correction loads. Figure 4 For example, in the above-mentioned tuner calibration system, there are three calibration loads, and the first calibration load is the target load (such as the calibration load & correction load 40), the second calibration load is composed of the target load (such as the calibration load & correction load 40) and a phase shifter (such as the phase shifter 44), and the result obtained by performing phase shift on the calibration load & correction load 40 through the phase shifter 44 is used as the second calibration load. Figure 4 For example, in the above-mentioned tuner calibration system, there are three calibration loads, and the first calibration load is the target load (such as the calibration load & correction load 40), the second calibration load is composed of the target load (such as the calibration load & correction load 40) and a phase shifter (such as the phase shifter 44), and the result obtained by performing phase shift on the calibration load & correction load 40 through the phase shifter 44 is used as the second calibration load. Figure 4 For example, in the above-mentioned tuner calibration system, there are three calibration loads, and the first calibration load is the target load (such as the calibration load & correction load 40), the second calibration load is composed of the target load (such as the calibration load & correction load 40) and a phase shifter (such as the phase shifter 44), and the result obtained by performing phase shift on the calibration load & correction load 40 through the phase shifter 44 is used as the second calibration load. Figure 4 For example, in the above-mentioned tuner calibration system, there are three calibration loads, and the first calibration load is the target load (such as the calibration load & correction load 40), the second calibration load is composed of the target load (such as the calibration load & correction load 40) and a phase shifter (such as the phase shifter 44), and the result obtained by performing phase shift on the calibration load & correction load 40 through the phase shifter 44 is used as the second calibration load. Figure 4 For example, in the above-mentioned tuner calibration system, there are three calibration loads, and the first calibration load is the target load (such as the calibration load & correction load 40), the second calibration load is composed of the target load (such as the calibration load & correction load 40) and a phase shifter (such as the phase shifter 44), and the result obtained by performing phase shift on the calibration load & correction load 40 through the phase shifter 44 is used as the second calibration load. Figure 4The phase shifter 45 is shown to be composed of, the result obtained by the phase shifter 45 to the calibration load & correction load 40 is used as the third correction load. Similarly, in the above tuner calibration system, the correction load is three, the first correction load is the target load (such as Figure 4 The calibration load & correction load 40 shown), the second correction load is composed of the target load (such as Figure 4 The calibration load & correction load 40 shown) and a phase shifter (such as Figure 4 The phase shifter 44 shown), the result obtained by the phase shifter 44 to the calibration load & correction load 40 is used as the second correction load. The third correction load is composed of the target load (such as Figure 5 The calibration load & correction load 40 shown) and a phase shifter (such as Figure 5 The phase shifter 45 shown), the result obtained by the phase shifter 45 to the calibration load & correction load 40 is used as the third correction load. That is, the calibration load and the correction load are completely multiplexed, the calibration load has a certain phase relationship (such as a phase difference of 120 degrees, or other phase relationships, and the phase difference of the three loads ensures that the phases of the three loads are on a circle) between the three loads, and the calibration load & correction load 40 is used as a calibration load or a correction load. The radio frequency integrated circuit 10 can obtain the correction factor by calculating the center position of the three correction loads, and then compensate the real-time reflection coefficient on the antenna side through the correction factor, to obtain a higher precision reflection coefficient value, to support the modulator to realize impedance tuning or aperture tuning. For example, when the radio frequency integrated circuit 10 controls the calibration switch to switch to connect to the calibration load and obtains the reflection coefficient of the calibration load through the coupler 20, the calibration load & correction load 40 is used as the calibration load. When the radio frequency integrated circuit 10 controls the calibration switch to switch to connect to the above correction load and obtains the reflection coefficient of the correction load through the coupler 20, the calibration load & correction load 40 is used as the correction load. In this application, by adding the phase shifter, the calibration load and the correction load can be completely multiplexed while reducing the number of loads, thereby reducing the number of components of the system, improving the stability of the system, and enhancing the structural diversity of the system, the structure is simple, and the applicability is strong.

[0038] In the present application, the introduction of the calibration load can realize the real-time calculation of the comprehensive parameters of the multiple link radio frequency parameters involved in the conversion of the reflection coefficient on the antenna side and the reflection coefficient on the feedback side, which can improve the detection accuracy of the comprehensive parameters of the link radio frequency parameters, thereby improving the detection accuracy of the radio frequency parameters of the components in the radio frequency link with the dimensional fluctuations of process accuracy, temperature and frequency, improving the impedance detection accuracy of the radio frequency link. In addition, the introduction of the correction load can realize the compensation of the real-time reflection coefficient on the antenna side, and the calculation accuracy of the configuration of impedance tuning and / or aperture tuning can be improved through the compensation of the real-time reflection coefficient on the antenna side, thereby improving the accuracy of impedance tuning and / or aperture tuning, improving the impedance detection accuracy, and the structure is simple and has strong applicability.

[0039] Referring to Figures 1 to 4 , Figures 1 to 4 is a flowchart of a control method of a tuner calibration system provided by the present application for improving impedance detection accuracy. The control method of the tuner calibration system provided by the present application (for convenience, or simply referred to as the method) is applicable to the tuner calibration system as shown in Figure 5 , which can be executed by a radio frequency integrated circuit in the tuner calibration system. The structure of the above-mentioned tuner calibration system can be referred to ​ , which will not be described here. As shown in ​ , the method can include the following steps:

[0040] S501, offline measurement of the impedance of the calibration load to obtain the offline reflection coefficient on the antenna side.

[0041] S502, control the calibration switch to switch to connect to the calibration load and obtain the reflection coefficient of the calibration load through the coupler.

[0042] S503, obtain the conversion parameters of the reflection coefficient on the antenna side and the reflection coefficient on the feedback side based on the offline reflection coefficient on the antenna side and the reflection coefficient of the calibration load.

[0043] In some possible implementations, the radio frequency integrated circuit can measure the impedance of the calibration load offline to obtain the offline reflection coefficient on the antenna side, where it can be understood that the offline reflection coefficient on the antenna side is the reflection coefficient on the antenna side obtained offline. After obtaining the offline reflection coefficient on the antenna side, the radio frequency integrated circuit can control the calibration switch to switch to be connected to the calibration load and obtain the reflection coefficient of the calibration load through the coupler, and obtain the conversion parameter of the reflection coefficient on the antenna side and the reflection coefficient on the feedback side based on the offline reflection coefficient on the antenna side and the reflection coefficient of the calibration load. Here, the radio frequency integrated circuit can obtain the offline measured reflection coefficient on the feedback side by obtaining the impedance of the calibration load, and can calculate the conversion parameter of the reflection coefficient on the antenna side and the reflection coefficient on the feedback side by obtaining the reflection coefficient of the calibration load as the reflection coefficient on the feedback side, where it can be understood that the conversion parameter here can be a comprehensive parameter of multiple link radio frequency parameters involved in the conversion of the reflection coefficient on the antenna side and the reflection coefficient on the feedback side. Here, the radio frequency integrated circuit can measure the impedance of three calibration loads offline to obtain three groups of offline reflection coefficients on the antenna side, and control the calibration switch to switch to be connected to the three calibration loads respectively and obtain three groups of reflection coefficients of the three calibration loads through the coupler respectively. When obtaining the conversion parameter of the reflection coefficient on the antenna side and the reflection coefficient on the feedback side based on the offline reflection coefficient on the antenna side and the reflection coefficient of the calibration load, the three groups of reflection coefficients of the three calibration loads can be taken as the reflection coefficient on the feedback side, and the conversion parameter abc of the reflection coefficient on the antenna side and the reflection coefficient on the feedback side can be obtained based on the three groups of offline reflection coefficients on the antenna side and the three groups of reflection coefficients; where the conversion parameter abc satisfies:

[0044]

[0045] where Г in is the reflection coefficient on the antenna side, and Г mrx is the reflection coefficient on the feedback side.

[0046] S504, obtaining the real-time reflection coefficient on the antenna side.

[0047] S505, controlling the calibration switch to switch to be connected to the correction load and obtaining the reflection coefficient of the correction load through the coupler.

[0048] S506, obtaining the antenna reflection coefficient based on the reflection coefficient of the correction load and the conversion parameter, and obtaining the correction factor based on the antenna reflection coefficient.

[0049] S507, performing error compensation on the real-time reflection coefficient on the antenna side based on the correction factor to obtain the compensated reflection coefficient on the antenna side.

[0050] In some possible embodiments, the antenna-side compensated reflection coefficient is used to obtain an impedance tuning and / or aperture tuning configuration, and then the impedance tuning and / or aperture tuning can be realized by the tuner based on the impedance tuning and / or aperture tuning configuration. The radio frequency integrated circuit can obtain a real-time reflection coefficient of the antenna side, control the calibration switch to switch to connect to the correction load and obtain a reflection coefficient of the correction load through the coupler, obtain an antenna reflection coefficient based on the reflection coefficient of the correction load and the conversion parameter, obtain a correction factor based on the antenna reflection coefficient, and compensate the real-time reflection coefficient of the antenna side based on the correction factor to obtain the above-mentioned antenna-side compensated reflection coefficient. Optionally, when the radio frequency integrated circuit controls the calibration switch to switch to connect to the correction load and obtain the reflection coefficient of the correction load through the coupler, the radio frequency integrated circuit can control the calibration switch to switch to connect to at least two correction loads and obtain at least two sets of reflection coefficients of the at least two correction loads through the coupler. When the antenna reflection coefficient is obtained based on the reflection coefficient of the correction load and the conversion parameter, and the correction factor is obtained based on the antenna reflection coefficient, the at least two sets of reflection coefficients of the at least two correction loads can be used as the reflection coefficient of the feedback side, at least two sets of antenna reflection coefficients are obtained by combining the at least two sets of reflection coefficients of the at least two correction loads and the conversion parameter, and the correction factor is obtained based on the at least two sets of antenna reflection coefficients. Herein, the correction factor includes a mean value of the at least two sets of antenna reflection coefficients, or a value of a center of a circle in which the at least two sets of antenna reflection coefficients are located.

[0051] Optionally, in some possible embodiments, the radio frequency integrated circuit can obtain at least two sets of reflection coefficients of at least two correction loads through the coupler, obtain at least two sets of antenna reflection coefficients based on the obtained at least two sets of reflection coefficients and the conversion parameter abc, calculate a mean value of the at least two sets of antenna reflection coefficients, and use the mean value as a correction factor of the antenna reflection coefficient.

[0052] Optionally, in some possible embodiments, the radio frequency integrated circuit can obtain three sets of reflection coefficients of three correction loads through the coupler, obtain three sets of antenna reflection coefficients based on the obtained three sets of reflection coefficients and the conversion parameter, calculate a center value of a circle in which the three sets of antenna reflection coefficients are located, and use the center value as a correction factor of the antenna reflection coefficient. In the present application, the compensation of the real-time reflection coefficient of the antenna side can improve the calculation accuracy of the impedance tuning and / or aperture tuning configuration, thereby improving the accuracy of the impedance tuning and / or aperture tuning, improving the impedance detection accuracy, and having a simple structure and strong applicability.

[0053] In the application, the introduction of the calibration load can realize the real-time calculation of the comprehensive parameters of the multiple link radio frequency parameters involved in the conversion of the reflection coefficient on the antenna side and the reflection coefficient on the feedback side, improve the detection accuracy of the comprehensive parameters of the link radio frequency parameters, and thus improve the detection accuracy of the radio frequency parameters of the components in the radio frequency link with the dimensional fluctuations of process accuracy, temperature and frequency, and improve the impedance detection accuracy of the radio frequency link. In addition, the introduction of the correction load can realize the compensation of the real-time reflection coefficient on the antenna side, and through the compensation of the real-time reflection coefficient on the antenna side, the calculation accuracy of the configuration of impedance tuning and / or aperture tuning can be improved, so that the accuracy of impedance tuning and / or aperture tuning can be improved, the impedance detection accuracy is improved, the structure is simple, and the applicability is strong.

Claims

1. A tuner calibration system for impedance detection accuracy enhancement, characterized by, The tuner calibration system comprises a radio frequency integrated circuit, a coupler, a tuner, a calibration load and a correction load; one end of the coupler is connected to the radio frequency integrated circuit, the other end of the coupler is connected to one end of the tuner, the other end of the tuner is used for connecting an antenna; one end of the calibration load and the correction load is used for connecting one end of a calibration switch, the other end of the calibration load and the correction load is grounded, the other end of the calibration switch is connected to the coupler; The radio frequency integrated circuit is used for offline measuring the impedance of the calibration load to obtain an offline reflection coefficient on the antenna side, controlling the calibration switch to switch to be connected to the calibration load and obtaining a reflection coefficient of the calibration load through the coupler, and obtaining a conversion parameter of a reflection coefficient on the antenna side and a reflection coefficient on the feedback side based on the offline reflection coefficient on the antenna side and the reflection coefficient of the calibration load; The radio frequency integrated circuit is further used for obtaining a real-time reflection coefficient on the antenna side, controlling the calibration switch to switch to be connected to the correction load and obtaining a reflection coefficient of the correction load through the coupler; The radio frequency integrated circuit is further used for obtaining an antenna reflection coefficient based on the reflection coefficient of the correction load and the conversion parameter, obtaining a correction factor based on the antenna reflection coefficient, and performing error compensation on the real-time reflection coefficient on the antenna side based on the correction factor to obtain a compensated reflection coefficient on the antenna side, wherein the compensated reflection coefficient on the antenna side is used for obtaining a configuration of impedance tuning and / or aperture tuning; The tuner is used for implementing impedance tuning and / or aperture tuning based on the configuration of impedance tuning and / or aperture tuning.

2. The tuner calibration system of claim 1, wherein, The calibration load comprises at least three first loads in parallel, and the correction load comprises at least two second loads in parallel.

3. The tuner calibration system of claim 1, wherein, The calibration load comprises at least three first loads in parallel; the tuner calibration system further comprises at least one phase shifter, and at least one first load in the calibration load is used as at least one correction load, and the at least one first load in the calibration load is used for connecting one end of the calibration switch in series with the phase shifter as at least one correction load.

4. The tuner calibration system of claim 1, wherein, The tuner calibration system comprises at least two phase shifters and a target load, the target load is used as one of the calibration load or one of the correction load, and the target load is used for connecting one end of the calibration switch in series with one of the phase shifters as one of the calibration load or one of the correction load.

5. The tuner calibration system of any of claims 1-4, wherein, The calibration load and the correction load are integrated in the tuner.

6. The tuner calibration system of any of claims 1-5, wherein, The radio frequency integrated circuit is used for: offline measuring the impedance of three calibration loads to obtain three groups of offline reflection coefficients on the antenna side; controlling the calibration switch to switch to be connected to the three calibration loads respectively and obtaining three groups of reflection coefficients of the three calibration loads through the coupler respectively; taking the three groups of reflection coefficients of the three calibration loads as reflection coefficients on the feedback side and obtaining a conversion parameter abc of a reflection coefficient on the antenna side and a reflection coefficient on the feedback side based on the three groups of offline reflection coefficients on the antenna side and the three groups of reflection coefficients; The conversion parameter abc satisfies: wherein, Γ in is the reflection coefficient on the antenna side, Γ mrx is the reflection coefficient on the feedback side.

7. The tuner calibration system of claim 6, wherein, The radio frequency integrated circuit is used for: controlling the calibration switch to switch to connect to at least two of the correction loads and to obtain at least two sets of reflection coefficients of the at least two correction loads through the coupler; combining the at least two sets of reflection coefficients of the at least two correction loads as reflection coefficients on the feedback side, obtaining at least two sets of antenna reflection coefficients based on the conversion parameter, and obtaining a correction factor based on the at least two sets of antenna reflection coefficients; The correction factor includes a mean value of the at least two sets of antenna reflection coefficients, or a value of a center of a circle in which the at least two sets of antenna reflection coefficients are located.

8. A control method of a tuner calibration system for impedance detection precision improvement, characterized by, The control method is applicable to a radio frequency integrated circuit in a tuner calibration system, and the tuner calibration system further includes a coupler, a tuner, a calibration load, and a correction load. One end of the coupler is connected to the radio frequency integrated circuit, the other end of the coupler is connected to one end of the tuner, the other end of the tuner is used to connect an antenna, one end of the calibration load and the correction load is used to connect one end of a calibration switch, the other end of the calibration load and the correction load is grounded, and the other end of the calibration switch is connected to the coupler. The method comprises: offline measuring impedance of the calibration load to obtain offline reflection coefficients on the antenna side, and controlling the calibration switch to switch to connect to the calibration load and to obtain reflection coefficients of the calibration load through the coupler; obtaining a conversion parameter of reflection coefficients on the antenna side and reflection coefficients on the feedback side based on the offline reflection coefficients on the antenna side and the reflection coefficients of the calibration load; obtaining real-time reflection coefficients on the antenna side, controlling the calibration switch to switch to connect to the correction load, and obtaining reflection coefficients of the correction load through the coupler; obtaining antenna reflection coefficients based on the reflection coefficients of the correction load and the conversion parameter, and obtaining a correction factor based on the antenna reflection coefficients; error compensating the real-time reflection coefficients on the antenna side based on the correction factor to obtain compensated reflection coefficients on the antenna side, and the compensated reflection coefficients on the antenna side are used to obtain configurations of impedance tuning and / or aperture tuning; implementing impedance tuning and / or aperture tuning based on the configurations of impedance tuning and / or aperture tuning through the tuner.

9. The control method according to claim 8, characterized by, The offline measuring impedance of the calibration load to obtain offline reflection coefficients on the antenna side, and controlling the calibration switch to switch to connect to the calibration load and to obtain reflection coefficients of the calibration load through the coupler comprises: offline measuring impedance of three calibration loads to obtain three sets of offline reflection coefficients on the antenna side, and controlling the calibration switch to switch to connect to the three calibration loads respectively and to obtain three sets of reflection coefficients of the three calibration loads through the coupler respectively; The conversion parameter of reflection coefficients on the antenna side and reflection coefficients on the feedback side based on the offline reflection coefficients on the antenna side and the reflection coefficients of the calibration load comprises: the three sets of reflection coefficients of the three calibration loads are taken as reflection coefficients of a feedback side, and conversion parameters abc of reflection coefficients of an antenna side and reflection coefficients of the feedback side are obtained based on the three sets of offline reflection coefficients of the antenna side and the three sets of reflection coefficients; wherein the conversion parameters abc satisfy: wherein, Γ in is the reflection coefficient on the antenna side, Γ mrx is the reflection coefficient on the feedback side.

10. The control method according to claim 9, characterized by, the control of the calibration switch to switch to be connected to the correction load and to obtain the reflection coefficient of the correction load through the coupler comprises: controlling the calibration switch to switch to be connected to at least two correction loads respectively and to obtain at least two sets of reflection coefficients of the at least two correction loads through the coupler; the obtaining of the antenna reflection coefficient based on the reflection coefficient of the correction load and the conversion parameters, and the obtaining of the correction factor based on the antenna reflection coefficient comprise: the at least two sets of reflection coefficients of the at least two correction loads are taken as reflection coefficients of a feedback side, at least two sets of antenna reflection coefficients are obtained in combination with the conversion parameters, and a correction factor is obtained based on the at least two sets of antenna reflection coefficients; wherein the correction factor comprises a mean value of the at least two sets of antenna reflection coefficients, or a value of a center of a circle in which the at least two sets of antenna reflection coefficients are located.

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