CN110855310A - Matching circuit, terminal and matching method - Google Patents
Matching circuit, terminal and matching method Download PDFInfo
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- CN110855310A CN110855310A CN201810836729.0A CN201810836729A CN110855310A CN 110855310 A CN110855310 A CN 110855310A CN 201810836729 A CN201810836729 A CN 201810836729A CN 110855310 A CN110855310 A CN 110855310A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
- H04B1/0067—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with one or more circuit blocks in common for different bands
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Abstract
The invention discloses a matching circuit, comprising: the device comprises a control circuit, an impedance adjusting circuit, a radio frequency circuit and an antenna; the control circuit is used for determining a first parameter based on the current working frequency band of the antenna; the first parameter characterizes a parameter forming impedance; generating a first instruction based on the first parameter, and sending the first instruction to the impedance adjusting circuit; the impedance adjusting circuit is used for receiving the first instruction; responding to the first instruction, adjusting the capacitance and the inductance in the self circuit based on the first parameter, and forming a first impedance; the second impedance and the radio frequency impedance of the radio frequency circuit meet a preset matching condition; the second impedance is the sum of the first impedance and the impedance of the antenna. The invention also discloses a terminal and a matching method.
Description
Technical Field
The invention relates to the technical field of antennas, in particular to a matching circuit, a terminal and a matching method.
Background
Power consumption is an important indicator of mobile terminal products, and reduction of power consumption is usually achieved by impedance matching. A group of matching circuits are shared between a radio frequency circuit on the mobile terminal and the antenna, and the antenna is a full-band antenna, so that only impedance convergence matched under a certain frequency band can be ensured, impedance convergence matched under each frequency band cannot be ensured, and the lowest power consumption of the mobile terminal cannot be realized under each frequency band.
Disclosure of Invention
In view of this, embodiments of the present invention are expected to provide a matching circuit, a terminal, and a matching method, which can achieve the lowest power consumption of the terminal in each operating frequency band.
The technical scheme of the embodiment of the invention is realized as follows:
the embodiment of the invention provides a matching circuit, which comprises a control circuit, an impedance adjusting circuit, a radio frequency circuit and an antenna, wherein the control circuit is used for controlling the impedance of the antenna; wherein the content of the first and second substances,
the control circuit is used for determining a first parameter based on the current working frequency band of the antenna; the first parameter characterizes a parameter forming impedance; generating a first instruction based on the first parameter, and sending the first instruction to the impedance adjusting circuit;
the impedance adjusting circuit is used for receiving the first instruction; responding to the first instruction, adjusting the capacitance and the inductance in the self circuit based on the first parameter, and forming a first impedance; the second impedance and the radio frequency impedance of the radio frequency circuit meet a preset matching condition; the second impedance is a sum of the first impedance and an impedance of the antenna.
In the above scheme, the control circuit is specifically configured to search an impedance parameter corresponding to the operating frequency band from a preset corresponding relationship between the frequency band and the impedance parameter; the searched impedance parameter is taken as the first parameter.
In the foregoing solution, the control circuit is specifically configured to send the first instruction to the impedance adjusting circuit through a Mobile Industry Processor Interface (MIPI) or a General Purpose input/output Interface (GPIO).
In the above scheme, the control circuit is configured to obtain a communication parameter; determining the current working frequency band of the antenna by using the communication parameters; the control circuit is a baseband processor on the terminal.
An embodiment of the present invention provides a terminal, where the terminal includes: the device comprises a control circuit, an impedance adjusting circuit, a radio frequency circuit and an antenna; wherein the content of the first and second substances,
the control circuit is used for determining a first parameter based on the current working frequency band of the antenna; the first parameter characterizes a parameter forming impedance; generating a first instruction based on the first parameter, and sending the first instruction to the impedance adjusting circuit;
the impedance adjusting circuit is used for receiving the first instruction; responding to the first instruction, adjusting the capacitance and the inductance in the self circuit based on the first parameter, and forming a first impedance; the second impedance and the radio frequency impedance of the radio frequency circuit meet a preset matching condition; the second impedance is a sum of the first impedance and an impedance of the antenna.
The embodiment of the invention provides a matching method, which comprises the following steps:
the control circuit determines a first parameter based on the current working frequency band of the antenna; the first parameter characterizes a parameter forming impedance; generating a first instruction based on the first parameter, and sending the first instruction to an impedance adjusting circuit;
the impedance adjustment circuit receives the first instruction; responding to the first instruction, adjusting the capacitance and the inductance in the self circuit based on the first parameter, and forming a first impedance; the second impedance and the radio frequency impedance of the radio frequency circuit meet a preset matching condition; the second impedance is a sum of the first impedance and an impedance of the antenna.
In the foregoing solution, the determining the first parameter includes:
searching impedance parameters corresponding to the working frequency band from a preset corresponding relation between the frequency band and the impedance parameters; the searched impedance parameter is taken as the first parameter.
In the foregoing solution, the sending the first instruction to the impedance adjusting circuit includes:
and the control circuit sends the first instruction to the impedance adjusting circuit through MIPI or GPIO.
In the above scheme, the method further comprises:
acquiring communication parameters; and determining the current working frequency band of the antenna by using the communication parameters.
In the above scheme, the control circuit is a baseband processor on the terminal.
The matching circuit, the terminal and the matching method provided by the embodiment of the invention comprise a radio frequency circuit, a control circuit, an impedance adjusting circuit and an antenna; the control circuit is used for determining a first parameter based on the current working frequency band of the antenna; the first parameter characterizes a parameter forming impedance; generating a first instruction based on the first parameter, and sending the first instruction to the impedance adjusting circuit; the impedance adjusting circuit is used for receiving the first instruction; responding to the first instruction, adjusting the capacitance and the inductance in the self circuit based on the first parameter, and forming a first impedance; the second impedance and the radio frequency impedance of the radio frequency circuit meet a preset matching condition; the second impedance is a sum of the first impedance and an impedance of the antenna. In the embodiment of the invention, a first parameter is determined based on the current working frequency band of the antenna; and forming a first impedance based on the first parameter, so that the sum of the first impedance and the impedance of the antenna and the radio frequency impedance of the radio frequency circuit can meet a preset matching condition in each working frequency band.
Meanwhile, when the sum of the first impedance and the impedance of the antenna and the radio frequency impedance of the radio frequency circuit meet a preset matching condition, the lowest power consumption of the terminal can be achieved, and therefore the lowest power consumption of the terminal can be achieved in each working frequency band.
Drawings
FIG. 1 is a graph illustrating the Smith chart impedance of a radio frequency link in the B8 band of the related art;
FIG. 2 is a current line schematic of a Smith chart illustrating the load pull-shift of a power amplifier in an RF link in the B8 band according to the related art;
FIG. 3 is a schematic diagram of a circuit structure of a matching circuit in the related art;
FIG. 4 is a schematic diagram of a matching circuit according to an embodiment of the present invention;
FIG. 5 is a first diagram illustrating a detailed structure of a matching circuit according to an embodiment of the present invention;
FIG. 6 is a second exemplary schematic diagram of a matching circuit according to the present invention;
FIG. 7 is a schematic diagram of an implementation flow of a matching method according to an embodiment of the present invention;
fig. 8 is a flowchart illustrating a specific implementation of the matching method according to the embodiment of the present invention.
Detailed Description
At present, how to reduce the power consumption of the mobile phone becomes a main problem of a terminal product, and the power consumption of a terminal power amplifier basically occupies about half of the power consumption of the mobile phone. Different frequency bands and systems in the radio frequency circuit have different matching circuits, so that the matching circuit of the power amplifier is optimal, and the power consumption of the power amplifier is also optimal.
However, since the antenna of the terminal product is integrated with all frequency band systems, it is impossible to achieve the optimum for different frequency bands at the same time. Therefore, after the antenna is added to the rf circuit, the current terminal product cannot minimize power consumption. In some cases, the power consumption of the product may be deteriorated more than twice as much as the minimum power consumption.
Taking the B8 band of a project as an example, fig. 1 is a smith chart impedance chart on a radio frequency link under the B8 band, as shown in fig. 1, when an antenna is added on the radio frequency link, the smith chart impedance of the B8 band is converged, and after the antenna is added on the radio frequency link, the smith chart impedance of the B8 band is not converged very much, obviously, the B8 band of the project has the problem that the radio frequency impedance and the antenna impedance are not compatible. Fig. 2 is a schematic diagram of a smith chart current line of a load pull shift (Loadpull) of a power amplifier in a radio frequency link under a B8 frequency band, and as shown in fig. 2, after an antenna is added to the radio frequency link, a current under a B8 frequency band spans about 150mA, so that a large current fluctuation, large power consumption and severe heat generation are caused in a process of using a B8 frequency band of the project by a mobile phone.
It should be noted that, during the debugging in the development phase, if no antenna is added on the radio frequency link of the mobile phone, the impedance matching of each frequency band at the radio frequency RF side is converged. However, since all frequency bands of the mobile phone share the same antenna, and a group of matching is shared from the RF side to the antenna side, as shown in fig. 3, it is not compatible with all frequency band impedances, and there is some frequency band impedances that do not converge, that is, the impedance has a large span of the current line on the smith chart of the load pull (Loadpull) of the power amplifier, which results in large current, large power consumption, severe heat generation, poor user experience, and the like when we use the mobile phone in an actual environment.
Based on this, in the embodiment of the present invention, the control circuit is configured to determine a first parameter based on a working frequency band in which the antenna is currently located; the first parameter characterizes a parameter forming impedance; generating a first instruction based on the first parameter, and sending the first instruction to an impedance adjusting circuit; the impedance adjusting circuit is used for receiving the first instruction; responding to the first instruction, adjusting the capacitance and the inductance in the self circuit based on the first parameter, and forming a first impedance; the sum of the first impedance and the impedance of the antenna and the radio frequency impedance of the radio frequency circuit meet a preset matching condition.
Fig. 4 is a matching circuit provided in an embodiment of the present invention, and as shown in fig. 4, the matching circuit includes: a control circuit 41, an impedance adjusting circuit 42, a radio frequency circuit 43, and an antenna 44; wherein the content of the first and second substances,
the control circuit 41 is configured to determine a first parameter based on the operating frequency band in which the antenna 44 is currently located; the first parameter characterizes a parameter forming impedance; based on the first parameter, a first instruction is generated and sent to the impedance adjusting circuit 42.
The impedance adjusting circuit 42 is configured to receive the first instruction; responding to the first instruction, adjusting the capacitance and the inductance of each element in the self circuit based on the first parameter, and forming a first impedance; the sum of the first impedance and the impedance of the antenna 44 and the rf impedance of the rf circuit 43 satisfy a preset matching condition.
Here, the first parameter may be a voltage, a current parameter, or the like characterizing the formation of the impedance; the components of the impedance adjusting circuit 42 include, but are not limited to, a variable inductance, a variable capacitance, a tuning switch Tuner, and the like.
The preset matching condition may be that the sum of the first impedance and the impedance of the antenna 44 is equal to the rf impedance of the rf circuit 43; it may also mean that the sum of the first impedance and the impedance of the antenna 44 and the radio frequency impedance of the radio frequency circuit 43 satisfy a conjugate matching condition, for example, a smith chart impedance point formed by the sum of the first impedance and the impedance of the antenna 44 and a smith chart impedance point formed by the radio frequency impedance satisfy central symmetry on a smith chart, so as to realize conjugate matching. The preset matching conditions include, but are not limited to, impedance equality, conjugate matching, and the like.
In practical application, the antenna impedance under different working frequency bands is different, for example, when the terminal works in the B1 frequency band, the antenna impedance is 50 ohms, the radio frequency impedance corresponding to the radio frequency circuit is 50 ohms, and here, the antenna impedance is matched with the radio frequency impedance; assuming that the terminal operates in the B2 band, the antenna impedance is 30 ohms and the rf impedance is 50 ohms, where the antenna impedance does not match the rf impedance.
Here, different antenna states in the same operating band also cause differences in antenna impedance. For example, assuming that the current working frequency band of the antenna is the B1 frequency band, when the user uses the left-handed terminal to make a call, assuming that the antenna impedance is 50 ohms and the rf impedance is 50 ohms, the antenna impedance and the rf impedance are matched; when a user uses the right-hand-held terminal to carry out conversation, the antenna impedance is not matched with the radio frequency impedance under the assumption that the antenna impedance is 40 ohms and the radio frequency impedance is 50 ohms; when the terminal is placed in free space, such as a table, the antenna impedance does not match the rf impedance, assuming 45 ohms for the antenna and 50 ohms for the rf impedance.
The antenna state refers to the current state of the terminal where the antenna is located, and specifically includes that the left-hand handheld terminal carries out conversation, the right-hand handheld terminal carries out conversation, and the terminal is placed in a free space.
In order to eliminate the difference between the antenna impedances in different operating frequency bands or different antenna states of the same operating frequency band, so as to match the antenna impedance with the radio frequency impedance, the impedance adjusting circuit 42 may adjust the capacitance and inductance of each element in its circuit by using the first parameter, form the first impedance, and match the sum of the first impedance and the antenna impedance with the radio frequency impedance, so as to ensure that the antenna impedance is matched with the radio frequency impedance in each operating frequency band and each antenna state. The components in the impedance adjusting circuit 42 may include: variable capacitance, variable inductance, resonant switch; for the variable capacitance element, only the capacitance is adjusted; for the variable inductance element, only the inductance is adjusted; for resonant switches, both capacitance and inductance can be adjusted.
It should be noted that, the voltage value is not limited herein to be used to adjust the capacitance and inductance of all the elements in the impedance adjusting circuit 42 to form the first impedance, and the implementation manner of forming the first impedance may be selected in combination with practical situations in practical applications.
In an embodiment, the control circuit 41 is specifically configured to search an impedance parameter corresponding to the operating frequency band from a preset corresponding relationship between the frequency band and the impedance parameter; the searched impedance parameter is taken as the first parameter.
In practical application, the control circuit 41 may also determine an impedance parameter according to the current working frequency band where the antenna is located and the antenna state; the determined impedance parameter is taken as the first parameter.
Here, for different antenna states of each operating frequency band supported by the terminal, a user may respectively optimize impedance parameters of first impedance formed in different antenna states of a corresponding operating frequency band through a vector network analyzer, so that the sum of the antenna impedance and the first impedance and the radio frequency impedance can both satisfy a preset matching condition in each antenna state corresponding to each operating frequency band; and writes the correspondence of the second parameter to the impedance parameter into the control circuit 41. The second parameter at least comprises frequency band information and antenna state information; the impedance parameter may be an impedance value, and may also be a voltage, current parameter, etc. characterizing the forming impedance.
In an embodiment, the control circuit 41 is specifically configured to send the first instruction to the impedance adjusting circuit 42 through MIPI or GPIO.
In practical application, the first instruction may carry a voltage value for controlling the formed impedance.
In an embodiment, the control circuit 41 is further configured to obtain a communication parameter from a base station; and determining the current working frequency band of the terminal antenna 44 by using the communication parameters. The communication parameter may be a Transmit Power Control (TPC) parameter.
Here, the control circuit 41 may further obtain status information of the sensor acquisition terminal, and determine the current antenna status by using the status information. Wherein, the sensor can be a gyroscope, an infrared sensor and the like.
The antenna 44 has different antenna impedances in different antenna states supported by the terminal in different frequency bands or in the same frequency band.
In practical application, the transmitting power can be determined according to the TPC parameters; and determining the corresponding working mode by using the determined transmitting power.
In one embodiment, the control circuit 41 is a baseband processor on the terminal.
Here, in order not to add circuit elements, the control circuit 41 may be a BaseBand (BB) processing unit on the terminal, so that not only the circuit modification is small, but also hardware resources can be saved.
In the embodiment of the invention, in the using process of the terminal, the respective first impedance is formed under each working frequency band, and the sum of the first impedance and the impedance of the antenna and the radio frequency impedance of the radio frequency circuit meet the preset matching condition, so that the problems of large current and large power consumption of the terminal in the using process caused by the difference of the antenna impedance under different working frequency bands or different antenna states of the same working frequency band can be solved. Meanwhile, the problem that the radio frequency impedance is not matched with the antenna impedance due to the fact that the antenna impedance is different under different working frequency bands or different antenna states of the same working frequency band can be solved through the first impedance, the impedance of the whole radio frequency link is enabled to be optimal, heating of a terminal is reduced, and the satisfaction degree of a user can be improved.
In addition, in different antenna states of different operating frequency bands or the same operating frequency band, only the capacitance and inductance of each element in the impedance adjusting circuit 42 need to be adjusted without adding hardware elements, and the impedance difference existing in the antenna impedance in different antenna states of different frequency bands or the same frequency band is eliminated through the formed first impedance, so that the antenna impedance is matched with the radio frequency impedance in each operating frequency band or each antenna state of the same frequency band.
An embodiment of the present invention further provides a terminal, where the terminal includes: a control circuit 41, an impedance adjusting circuit 42, a radio frequency circuit 43, and an antenna 44; wherein the content of the first and second substances,
the control circuit 41 is configured to determine a first parameter based on the operating frequency band in which the antenna 44 is currently located; the first parameter characterizes a parameter forming impedance; generating a first instruction based on the first parameter and sending the first instruction to the impedance adjusting circuit 42;
the impedance adjusting circuit 42 is configured to receive the first instruction; responding to the first instruction, adjusting the capacitance and the inductance of each element in the self circuit based on the first parameter, and forming a first impedance; wherein, the sum of the first impedance and the impedance of the antenna 44 and the radio frequency impedance of the radio frequency circuit 43 satisfy a preset matching condition.
Fig. 5 is a specific application example of the circuit shown in fig. 4, and as shown in fig. 5, the matching circuit includes: a Power Amplifier (PA), duplexes 1 to n, a Wireless radio transceiver (WTR), a switch, a test seat, a controllable matching circuit, an antenna, a BB processing unit and an antenna; wherein the content of the first and second substances,
the control circuit 41 is a BB processing unit; the impedance adjusting circuit 42 is a controllable matching circuit; the controllable matching circuit comprises a variable inductance, a variable capacitance, a resonant switch (not shown in fig. 5); the radio frequency circuit 43 includes: PA, duplex 1 to duplex n, WTR, switch, test socket; in the research and development period, most radio frequency tests are completed by radio frequency conduction test lines for radio frequency, and a radio frequency comprehensive test instrument needs to be connected to the test seat of the single board to realize radio frequency index tests; when the radio frequency comprehensive test instrument is not connected, the switch is communicated with the controllable matching circuit through the test seat; the switch is used for switching from the duplex 1 to the duplex n, and when the switch is switched to the duplex 1, the PA works in a B1 frequency band; when switching to duplex 2, the PA is indicated to operate in the B2 frequency band; by analogy, when the working frequency band is switched to the duplex n, the PA is indicated to work in the Bn frequency band, and thus, the switching of the working frequency band of the PA can be controlled through the switch; the antenna 44 is an antenna.
The operating principle of the matching circuit shown in fig. 5 is:
the BB processing unit determines an impedance parameter forming first impedance based on a current working frequency range of the antenna and the state of the antenna; generating a first instruction based on the impedance parameter, and sending the first instruction to the controllable matching circuit through MIPI or GPIO; the first command carries a voltage value that controls the formation of a first impedance.
After the controllable matching circuit receives the first instruction, the capacitance and inductance of all elements in the circuit of the controllable matching circuit are adjusted by using the voltage value to form first impedance; the sum of the first impedance and the impedance of the antenna and the impedance of the radio frequency circuit meet a preset matching condition, so that the power consumption of the terminal under the current working frequency band can be the lowest.
Therefore, the lowest power consumption can be realized in different working frequency bands supported by the terminal and different antenna states of the same working frequency band, and therefore, the terminal is not heated, and the user satisfaction is improved.
It should be noted that, a controllable matching circuit is added at the front end of the antenna on the Radio Frequency link of the terminal, and the controllable matching circuit is used for optimizing impedance matching from the Radio Frequency (RF) side to the antenna side, so that the terminal can form corresponding first impedance by using the controllable matching circuit in each supported working Frequency band or each antenna state of the same working Frequency band; the first impedance is adaptively adjusted along with the change of the working frequency band.
In addition, for each working frequency band supported by the terminal and the antenna state under the current working frequency band, a user can respectively optimize the impedance parameters of the corresponding working frequency band through a vector network analyzer, and specifically, after the antenna is added to the radio frequency link, when the impedance on a LoadPull smith chart of the power amplifier is optimal, namely close to 1, the current of the radio frequency link during working is minimum, and further the power consumption is minimum. After the optimization is completed, writing a corresponding relation between a second parameter and an impedance parameter into a BB processing unit of the terminal, wherein the second parameter at least comprises a working frequency band and an antenna state, so that under different use scenes, namely under different antenna states of different frequency bands or the same frequency band, the BB processing unit can control the controllable matching circuit to dynamically adjust the first impedance through the MIPI or the GPIO, the sum of the first impedance and the impedance of the antenna and the impedance of the radio frequency circuit meet a preset matching condition, and the impedance on the Smith chart is closer to 1. In other words, the best impedance matching state can be realized under different working frequency bands or different antenna states of the same working frequency band, so that the current and the power consumption of each working frequency band are minimum.
Fig. 6 is another specific application example of the circuit shown in fig. 4, and as shown in fig. 6, the matching circuit includes: an RF circuit, a BB processing unit on a terminal, a base station, a controllable matching circuit and a terminal antenna; wherein the content of the first and second substances,
the control circuit 41 is a BB processing unit; the impedance adjusting circuit 42 is a controllable matching circuit; the controllable matching circuit comprises a variable inductor, a variable capacitor and a tuning switch; the radio frequency circuit 43 is an RF circuit; the antenna 44 is an antenna.
The operating principle of the matching circuit shown in fig. 6 is:
the BB processing unit acquires communication parameters such as TPC parameters from a base station, determines the current working frequency band of a terminal antenna according to the acquired TPC parameters, acquires terminal state information acquired by a sensor, determines the current antenna state according to the terminal state information, and determines impedance parameters corresponding to the first antenna state from the corresponding relation between preset second parameters and the impedance parameters; the second parameter at least comprises a working frequency band and an antenna state; and based on the impedance parameters, inputting digital signals to the controllable matching circuit through the MIPI or the GPIO to dynamically adjust the capacitance and the inductance of all elements in the controllable matching circuit so as to form a first impedance which enables the impedance of the whole radio frequency link to be optimal.
Fig. 7 is a matching method provided in an embodiment of the present invention, and as shown in fig. 7, the method includes:
step 701: the control circuit determines a first parameter based on a working frequency band where the terminal antenna is currently located; the first parameter characterizes a parameter forming impedance; generating a first instruction based on the first parameter, and sending the first instruction to an impedance adjusting circuit;
step 702: the impedance matching adjustment circuit receives the first instruction; responding to the first instruction, adjusting the capacitance and the inductance of each element in the self circuit based on the first parameter, and forming a first impedance; the first impedance meets the condition that the sum of the first impedance and the impedance of the antenna and the radio frequency impedance of the radio frequency circuit meet a preset matching condition.
Here, the first parameter may be an impedance parameter, and may also be a voltage, a current parameter, or the like characterizing the formation of impedance; various components of the impedance matching adjustment circuit include, but are not limited to, a variable inductance, a variable capacitance, a tuning switch Tuner, and the like.
It should be noted that, the voltage value is not limited to be used here to adjust the capacitance and inductance of each element to form the first impedance, and in practical applications, an implementation manner of forming the first impedance may be selected according to practical situations.
In an embodiment, the determining the first parameter includes: searching impedance parameters corresponding to the working frequency band from a preset corresponding relation between the frequency band and the impedance parameters; the searched impedance parameter is taken as the first parameter.
In practical application, the impedance parameter can be determined according to the current working frequency band of the antenna and the state of the antenna; the determined impedance parameter is taken as the first parameter.
Here, for each operating frequency band supported by the terminal, the user may optimize impedance parameters of the corresponding operating frequency band or the same operating frequency band in different antenna states respectively through the vector network analyzer, so as to obtain a corresponding relationship between the second parameter and the impedance parameter. Wherein the second parameter at least comprises a payroll frequency band and an antenna state; the impedance parameter may be an impedance value, and may also be a voltage, current parameter, etc. characterizing the forming impedance.
In one embodiment, the sending the first instruction to the impedance adjustment circuit includes: and the control circuit sends the first instruction to the impedance adjusting circuit through MIPI or GPIO.
In practical application, the first instruction may carry a voltage value for controlling the formed impedance.
In one embodiment, the method comprises: acquiring communication parameters from a base station; and determining the current working frequency band of the terminal antenna by using the communication parameters.
In an embodiment, the method further comprises: acquiring state information of a sensor acquisition terminal, and determining the current antenna state by using the state information; wherein, the sensor can be a gyroscope, an infrared sensor and the like. The antenna state refers to the current state of the terminal where the antenna is located, and specifically comprises that the left-hand handheld terminal carries out conversation, the right-hand handheld terminal carries out conversation, and the terminal is placed in a free space
In one embodiment, the control circuit is a baseband processor on the terminal.
Here, the control circuit may be a BB baseband processing unit on the terminal so as not to increase circuit elements, and thus, the circuit is less modified, and hardware resources can be saved.
The following describes the specific implementation process of the matching method of the present invention in detail with specific embodiments.
Fig. 8 is a schematic diagram of a specific implementation flow of the matching method according to the embodiment of the present invention, and in combination with a schematic diagram of a composition structure of the matching circuit shown in fig. 6, the method includes the following steps:
step 801: and optimizing impedance parameters according to different antenna states of the current working frequency band of the antenna.
For each antenna state of a certain working frequency band of a terminal such as a mobile phone, in a research and development stage, an engineer optimizes impedance parameters of each antenna state of the frequency band through a vector network analyzer, so that after an antenna is added to a radio frequency link, the impedance is optimal on a LoadPull smith chart of a power amplifier when the radio frequency link looks out from a power amplifier port, and the current of the radio frequency link during working is minimum, namely the power consumption is minimum.
And repeating the step 801 to optimize impedance parameters of other frequency bands supported by the mobile phone in different antenna states. Writing the optimized corresponding relation between the impedance parameter and the second parameter into a BB processing unit of the mobile phone; the second parameter at least comprises an operating frequency band and an antenna state.
Step 802: the BB processing unit acquires TPC parameters and determines the current working frequency band of the antenna; acquiring terminal state information acquired by a sensor, and determining the current antenna state by using the terminal state information; and calling impedance parameters corresponding to the current working frequency band and the current antenna state so as to control the controllable matching circuit to form first impedance.
Under different use scenes, namely different working frequency bands or different antenna states of the same working frequency band, the BB processing unit can dynamically call corresponding impedance parameters, and the controllable matching circuit is controlled to form corresponding first impedance through the MIPI or the GPIO. Therefore, the impedance parameters can be adjusted in a self-adaptive mode, the impedance matching of the radio frequency link under different antenna states of each working frequency band or the same working frequency band is guaranteed to be optimal, and the lowest power consumption is achieved.
Step 803: judging whether the antenna is switched to other working frequency bands or not; when determined, step 801 is performed.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (10)
1. A matching circuit, characterized in that the matching circuit comprises: the device comprises a control circuit, an impedance adjusting circuit, a radio frequency circuit and an antenna; wherein the content of the first and second substances,
the control circuit is used for determining a first parameter based on the current working frequency band of the antenna; the first parameter characterizes a parameter forming impedance; generating a first instruction based on the first parameter, and sending the first instruction to the impedance adjusting circuit;
the impedance adjusting circuit is used for receiving the first instruction; responding to the first instruction, adjusting the capacitance and the inductance in the self circuit based on the first parameter, and forming a first impedance; the second impedance and the radio frequency impedance of the radio frequency circuit meet a preset matching condition; the second impedance is a sum of the first impedance and an impedance of the antenna.
2. The circuit of claim 1,
the control circuit is specifically configured to search an impedance parameter corresponding to the operating frequency band from a preset corresponding relationship between the frequency band and the impedance parameter; the searched impedance parameter is taken as the first parameter.
3. The circuit of claim 1,
the control circuit is specifically configured to send the first instruction to the impedance adjusting circuit through a mobile industry processor interface MIPI or a general purpose input/output interface GPIO.
4. The circuit of claim 1,
the control circuit is used for acquiring communication parameters; determining the current working frequency band of the antenna by using the communication parameters; the control circuit is a baseband processor on the terminal.
5. A terminal, characterized in that the terminal comprises: the device comprises a control circuit, an impedance adjusting circuit, a radio frequency circuit and an antenna; wherein the content of the first and second substances,
the control circuit is used for determining a first parameter based on the current working frequency band of the antenna; the first parameter characterizes a parameter forming impedance; generating a first instruction based on the first parameter, and sending the first instruction to the impedance adjusting circuit;
the impedance adjusting circuit is used for receiving the first instruction; responding to the first instruction, adjusting the capacitance and the inductance in the self circuit based on the first parameter, and forming a first impedance; the second impedance and the radio frequency impedance of the radio frequency circuit meet a preset matching condition; the second impedance is a sum of the first impedance and an impedance of the antenna.
6. A method of matching, the method comprising:
the control circuit determines a first parameter based on the current working frequency band of the antenna; the first parameter characterizes a parameter forming impedance; generating a first instruction based on the first parameter, and sending the first instruction to an impedance adjusting circuit;
the impedance adjustment circuit receives the first instruction; responding to the first instruction, adjusting the capacitance and the inductance in the self circuit based on the first parameter, and forming a first impedance; the second impedance and the radio frequency impedance of the radio frequency circuit meet a preset matching condition; the second impedance is a sum of the first impedance and an impedance of the antenna.
7. The method of claim 6, wherein determining the first parameter comprises:
searching impedance parameters corresponding to the working frequency band from a preset corresponding relation between the frequency band and the impedance parameters; the searched impedance parameter is taken as the first parameter.
8. The method of claim 6, wherein said sending the first instruction to an impedance adjustment circuit comprises:
and the control circuit sends the first instruction to the impedance adjusting circuit through a Mobile Industry Processor Interface (MIPI) or a general purpose input/output interface (GPIO).
9. The method of claim 6, further comprising:
acquiring communication parameters; and determining the current working frequency band of the antenna by using the communication parameters.
10. The method of claim 9, wherein the control circuit is a baseband processor on the terminal.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810836729.0A CN110855310A (en) | 2018-07-26 | 2018-07-26 | Matching circuit, terminal and matching method |
| PCT/CN2019/097496 WO2020020225A1 (en) | 2018-07-26 | 2019-07-24 | Matching circuit, terminal, and matching method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810836729.0A CN110855310A (en) | 2018-07-26 | 2018-07-26 | Matching circuit, terminal and matching method |
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| CN110855310A true CN110855310A (en) | 2020-02-28 |
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| CN201810836729.0A Pending CN110855310A (en) | 2018-07-26 | 2018-07-26 | Matching circuit, terminal and matching method |
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| Country | Link |
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| CN (1) | CN110855310A (en) |
| WO (1) | WO2020020225A1 (en) |
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| CN112152660A (en) * | 2020-09-25 | 2020-12-29 | Oppo（重庆）智能科技有限公司 | Control method and device of radio frequency circuit and electronic equipment |
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| WO2020020225A1 (en) | 2020-01-30 |
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