CN113922830B - Impedance adjustment method, radio frequency circuit, communication device and computer device - Google Patents
Impedance adjustment method, radio frequency circuit, communication device and computer device Download PDFInfo
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- 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
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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
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- H04B1/0475—Circuits with means for limiting noise, interference or distortion
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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
- H04B1/02—Transmitters
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- H04B2001/0408—Circuits with power amplifiers
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Abstract
The application relates to an impedance adjustment method, a radio frequency circuit, a communication device and a computer device. The impedance adjusting method is applied to communication equipment; the method comprises the following steps: carrying out load traction on a power amplifier in communication equipment to obtain a first mapping relation between an impedance value of an antenna matching circuit and output current of the power amplifier and a second mapping relation between the impedance value and output power of the power amplifier; determining an impedance value interval corresponding to a preset power interval according to the second mapping relation; determining selectable impedance points according to the impedance value interval and the first mapping relation; the selectable impedance point is an impedance point with an impedance value within an impedance value interval and an output current corresponding to the impedance value smaller than a current threshold value; the current threshold is a corresponding current value when a noise value generated by the power amplifier working in a preset power interval is larger than or equal to the noise threshold. The current noise generated by the power amplifier can be reduced on the premise of ensuring the communication quality.
Description
Technical Field
The present disclosure relates to the field of radio frequency technologies, and in particular, to an impedance adjustment method, a radio frequency circuit, a communication device, and a computer device.
Background
With the continuous development of radio frequency technology, the quality requirements of communication equipment on transmitted signals are also higher and higher, so that the design of radio frequency circuits is challenged.
When the radio frequency circuit works in some frequency bands requiring higher transmission Power, the current at the output end of a Power Amplifier (PA) in the radio frequency circuit is relatively large, so that relatively large current noise can be generated when communication is performed, and if the output Power of the Power Amplifier is directly reduced to improve the current noise, the communication quality can be influenced.
Disclosure of Invention
The embodiment of the application provides an impedance adjusting method, a radio frequency circuit, communication equipment and computer equipment, which can reduce current noise generated by a power amplifier on the premise of ensuring communication quality.
An impedance adjusting method is applied to communication equipment; the method comprises the following steps:
carrying out load traction on a power amplifier in the communication equipment to obtain a first mapping relation between an impedance value of an antenna matching circuit and output current of the power amplifier and a second mapping relation between the impedance value and output power of the power amplifier;
determining an impedance value interval corresponding to a preset power interval according to the second mapping relation;
Determining selectable impedance points according to the impedance value interval and the first mapping relation; the selectable impedance point is an impedance point with an impedance value within the impedance value interval and an output current corresponding to the impedance value smaller than a current threshold value; the current threshold is a current value corresponding to a noise value generated by the power amplifier working in the preset power interval when the noise value is greater than or equal to the noise threshold.
A radio frequency circuit comprising:
an antenna;
a power amplifier;
the radio frequency matching circuit is connected with the power amplifier and used for providing impedance matching with the power amplifier;
the first antenna matching circuit is respectively connected with the radio frequency matching circuit and the antenna and is used for providing impedance matching with the antenna so as to reduce noise generated when the power amplifier works in a first frequency band;
wherein the impedance point of the first antenna matching circuit is selected from selectable impedance points; the selectable impedance point is determined according to the steps of:
carrying out load traction on the power amplifier to obtain a first mapping relation between an impedance value of a first antenna matching circuit and output current of the power amplifier and a second mapping relation between the impedance value and output power of the power amplifier;
Determining an impedance value interval corresponding to a preset power interval according to the second mapping relation;
determining selectable impedance points according to the impedance value interval and the first mapping relation; the selectable impedance point is an impedance point with an impedance value within the impedance value interval and an output current corresponding to the impedance value smaller than a current threshold value; the current threshold is a current value corresponding to a noise value generated by the power amplifier working in the preset power interval when the noise value is greater than or equal to the noise threshold.
A communication device comprising a radio frequency circuit as described above.
A computer device comprising a memory storing a computer program and a processor which when executing the computer program performs the steps of:
carrying out load traction on a power amplifier in the communication equipment to obtain a first mapping relation between an impedance value of an antenna matching circuit and output current of the power amplifier and a second mapping relation between the impedance value and output power of the power amplifier;
determining an impedance value interval corresponding to a preset power interval according to the second mapping relation;
determining selectable impedance points according to the impedance value interval and the first mapping relation; the selectable impedance point is an impedance point with an impedance value within the impedance value interval and an output current corresponding to the impedance value smaller than a current threshold value; the current threshold is a current value corresponding to a noise value generated by the power amplifier working in the preset power interval when the noise value is greater than or equal to the noise threshold.
A computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of:
carrying out load traction on a power amplifier in the communication equipment to obtain a first mapping relation between an impedance value of an antenna matching circuit and output current of the power amplifier and a second mapping relation between the impedance value and output power of the power amplifier;
determining an impedance value interval corresponding to a preset power interval according to the second mapping relation;
determining selectable impedance points according to the impedance value interval and the first mapping relation; the selectable impedance point is an impedance point with an impedance value within the impedance value interval and an output current corresponding to the impedance value smaller than a current threshold value; the current threshold is a current value corresponding to a noise value generated by the power amplifier working in the preset power interval when the noise value is greater than or equal to the noise threshold.
According to the impedance adjusting method, the radio frequency circuit, the communication equipment and the computer equipment, the first mapping relation between the impedance value of the antenna matching circuit and the output current of the power amplifier and the second mapping relation between the impedance value of the antenna matching circuit and the output power are obtained through carrying out load traction on the power amplifier in the communication equipment, the impedance value interval meeting the power requirement is determined according to the preset power interval and the second mapping relation, and then the selectable impedance point which enables the noise value of the power amplifier to be lower than the noise threshold value is determined by combining the first mapping relation, so that the impedance point of the antenna matching circuit is selected, further, the current noise is reduced as far as possible without reducing the power, and the additional noise reduction device, the device structure or the circuit structure are not required to be changed on the premise of ensuring the communication quality.
Drawings
In order to more clearly illustrate the technical solutions of embodiments or conventional techniques of the present application, the drawings required for the descriptions of the embodiments or conventional techniques will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a flow chart of an impedance adjusting method according to an embodiment;
FIG. 2 is a flow chart of an impedance adjusting method according to another embodiment;
FIG. 3 is a flowchart illustrating a step of determining one of a plurality of selectable impedance points as a target impedance point according to an embodiment;
FIG. 4 is a flowchart illustrating a step of determining one of a plurality of selectable impedance points as a target impedance point according to another embodiment;
FIG. 5 is a flow chart of an impedance adjusting method according to another embodiment;
FIG. 6 is a block diagram of an impedance adjusting device according to an embodiment;
FIG. 7 is a block diagram of an impedance adjusting device according to another embodiment;
FIG. 8 is one of the block diagrams of the RF circuit of an embodiment;
FIG. 9 is a second block diagram of an RF circuit according to an embodiment;
FIG. 10 is a third block diagram of an RF circuit according to an embodiment;
FIG. 11 is a fourth block diagram of a radio frequency circuit of an embodiment;
fig. 12 is a schematic structural diagram of a communication device according to an embodiment.
Detailed Description
In order to facilitate an understanding of the present application, a more complete description of the present application will now be provided with reference to the relevant figures. Examples of the present application are given in the accompanying drawings. This application may, however, be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that the terms "first," "second," and the like, as used herein, may be used to describe various features, but these features are not limited by these terms. These terms are only used to distinguish one feature from another feature.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless explicitly defined otherwise.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected to the other element through intervening elements. Further, "connection" in the following embodiments should be understood as "electrical connection", "communication connection", and the like if there is transmission of electrical signals or data between objects to be connected.
As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," and/or the like, specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof. Also, the term "and/or" as used in this specification includes any and all combinations of the associated listed items.
The impedance adjustment method of an embodiment of the present application is applied to performing impedance adjustment on an antenna matching circuit of a communication device, where in one embodiment, the communication device may be a communication device including a mobile phone, a tablet computer, a notebook computer, a palm computer, a mobile internet device (Mobile Internet Device, MID), a wearable device (e.g. a smart watch, a smart bracelet, a pedometer, etc.), or other communication devices provided with an antenna matching circuit.
As shown in fig. 1, an embodiment of the present application provides an impedance adjustment method, including steps 101 to 103, where:
step 101, carrying out load traction on a power amplifier in the communication equipment to obtain a first mapping relation between an impedance value of an antenna matching circuit and an output current of the power amplifier and a second mapping relation between the impedance value and output power of the power amplifier.
The load traction is a method for obtaining working parameters of a device under different input end impedance and output end impedance by continuously adjusting the input end impedance and the output end impedance of an active device (particularly a power amplifier in the application), and is mainly used for adjusting the output end impedance of the power amplifier (namely, the impedance of an antenna matching circuit in a radio frequency circuit) in the embodiment of the application, so as to further determine the corresponding relation between the different impedances and the output current and the output power of the power amplifier, namely, obtain a first mapping relation between an impedance value and the output current and a second mapping relation between the impedance value and the output power.
Step 102, determining an impedance value interval corresponding to the preset power interval according to the second mapping relation.
The lower power limit of the preset power interval is the lowest power for ensuring stable communication quality of the communication equipment, and the upper power limit of the preset power interval can be the maximum power for meeting the power consumption requirement of the communication equipment. And determining an impedance value interval capable of ensuring stable communication quality of the communication equipment based on the preset power interval and the second mapping relation.
And step 103, determining an optional impedance point according to the impedance value interval and the first mapping relation.
The selectable impedance point is an impedance point with an impedance value within an impedance value interval and an output current corresponding to the impedance value smaller than a current threshold value; the current threshold is a corresponding current value when a noise value generated by the power amplifier working in a preset power interval is larger than or equal to the noise threshold.
Within an impedance value interval determined based on a preset power interval, a selectable impedance point at which the output current is less than a current threshold is determined in conjunction with a first mapping relationship associated with the output current. Because the impedance value is nonlinear correlation with the output power and the output current, the selectable impedance point which can not only ensure the communication quality requirement but also reduce the output current can be found through load traction, thereby realizing the purpose of reducing the noise generated by the power amplifier.
According to the impedance adjusting method, the first mapping relation between the impedance value of the antenna matching circuit and the output current of the power amplifier and the second mapping relation between the impedance value of the antenna matching circuit and the output power are obtained through carrying out load traction on the power amplifier in the communication equipment, the impedance value interval meeting the power requirement is determined according to the preset power interval and the second mapping relation, and then the selectable impedance point which enables the noise value of the power amplifier to be lower than the noise threshold value is determined by combining the first mapping relation and is used for selecting the impedance point of the antenna matching circuit, so that the current noise is reduced on the premise that the power is not reduced as much as possible, an additional noise reduction device is not required to be added, the device structure is not required to be changed, or the circuit structure is not required to be changed, the implementation is simple, and the cost is not required to be increased.
As shown in fig. 2, in one embodiment, the determined selectable impedance point is a plurality, and the impedance adjustment method includes steps 201-205, where:
step 201, load traction is performed on a power amplifier in the communication device, so as to obtain a first mapping relation between an impedance value of an antenna matching circuit and an output current of the power amplifier, and a second mapping relation between the impedance value and an output power of the power amplifier.
Step 202, determining an impedance value interval corresponding to the preset power interval according to the second mapping relation.
And 203, determining an optional impedance point according to the impedance value interval and the first mapping relation. The selectable impedance point is an impedance point with an impedance value within an impedance value interval and an output current corresponding to the impedance value smaller than a current threshold value; the current threshold is a corresponding current value when a noise value generated by the power amplifier working in a preset power interval is larger than or equal to the noise threshold.
At step 204, one of a plurality of selectable impedance points is determined as a target impedance point.
Step 205, determining the electrical parameters of the impedance devices in the antenna matching circuit according to the target impedance point.
In some embodiments, there are a plurality of impedance points within the impedance value interval that satisfy the output current less than the current resistance, and at this time, one of the impedance points may be selected as a target impedance point according to the working requirement of the power amplifier, so as to determine the electrical parameter of the impedance device in the antenna matching circuit. Wherein the impedance device may comprise at least one of a capacitance, an inductance, and a resistance, and the electrical parameter comprises a capacitance value of the capacitance when the impedance device comprises the capacitance; when the impedance device comprises an inductance, the electrical parameter comprises an inductance value of the inductance; when the impedance device comprises a resistor, the electrical parameter comprises a resistance value of the resistor; when the impedance device includes more than two devices, the electrical parameter further includes a connection relationship between each device, for example, a capacitor and an inductor, where the capacitor and the inductor are disposed in series or in parallel.
As shown in fig. 3, in one embodiment, the step of determining one of the plurality of selectable impedance points as a target impedance point includes steps 301-302, wherein:
in step 301, a noise value of a power amplifier is obtained.
Step 302, determining a target impedance point in a plurality of selectable impedance points according to the noise value; the noise value is inversely related to the output current corresponding to the target impedance point.
In this embodiment, a noise value of the power amplifier that generates noise when in operation may be acquired, and the target impedance point may be determined among the selectable impedance points based on the magnitude of the noise value. If the noise value is larger, a corresponding target impedance point with smaller output current can be selected so as to reduce the noise caused by the output current; if the noise value is smaller, a corresponding target impedance point with larger output current can be selected, and the output power requirement of the power amplifier is preferentially ensured.
As shown in fig. 4, in one embodiment, the step of determining one of the plurality of selectable impedance points as a target impedance point includes steps 401-403, wherein:
step 401, operating a power amplifier in a plurality of signal strength scenarios.
The communication equipment is used for ensuring stable communication quality when working under different signal intensity scenes, and the requirements for the output power of the power amplifier are different. If the signal strength of the signal strength scene where the communication equipment is located is weaker, the power amplifier needs higher output power to ensure the communication quality; if the signal strength of the signal strength scene where the communication equipment is located is stronger, the power amplifier can adopt lower output power to ensure the communication quality. The signal strength scene of the communication equipment can be changed in a scene simulation mode, so that the power amplifier works in a plurality of signal strength scenes.
Step 402, a noise value generated by a power amplifier operating in each signal strength scenario is obtained.
Since the output power requirements of the power amplifier may vary when the communication device is operating in each signal strength scenario, the noise value generated by the power amplifier may also vary, so that the noise value generated by the power amplifier in each signal strength scenario may be obtained to select a target impedance point for the communication device operating in a different signal strength scenario.
Step 403, determining a target impedance point in the plurality of selectable impedance points according to the noise value corresponding to each signal intensity scene.
According to the noise value of the noise generated by the power amplifier under each signal intensity scene, a corresponding target impedance point is selected from the selectable impedance points, and then a plurality of antenna matching circuits respectively used under different signal intensity scenes are selected for the communication equipment, so that the noise of the power amplifier is reduced.
As shown in fig. 5, in one embodiment, the impedance adjustment method includes steps 501-508, wherein:
step 501, load traction is performed on a power amplifier in a communication device, so as to obtain a first mapping relation between an impedance value of an antenna matching circuit and an output current of the power amplifier, and a second mapping relation between the impedance value and an output power of the power amplifier.
Step 502, determining a preset power interval according to a signal strength scene; the lower limit value of the preset power interval is equal to the minimum output power required by the power amplifier in each signal strength scene.
Step 503, determining an impedance value interval corresponding to the preset power interval according to the second mapping relation.
Step 504, determining selectable impedance points according to the impedance value interval and the first mapping relation; the selectable impedance point is an impedance point with an impedance value within an impedance value interval and an output current corresponding to the impedance value smaller than a current threshold value; the current threshold is a corresponding current value when a noise value generated by the power amplifier working in a preset power interval is larger than or equal to the noise threshold.
Step 505, operating the power amplifier in a plurality of signal strength scenarios.
Step 506, obtaining a noise value generated by a power amplifier operating in each signal strength scenario.
Step 507, determining a target impedance point in a plurality of selectable impedance points according to the noise value corresponding to each signal intensity scene; the noise value is inversely related to the output current corresponding to the target impedance point.
Step 508, determining the electrical parameters of the impedance devices in the antenna matching circuit according to the target impedance point.
In this embodiment, in order to ensure stable communication quality of the communication device under different signal strength scenarios, a preset power interval may be determined according to the lowest output power of the power amplifier under each signal strength scenario, then an impedance value interval is determined according to the preset power interval and the second mapping relation, an optional impedance point where the output current is smaller than the current threshold is determined according to the determined impedance value interval and the first mapping relation, then a target impedance point is determined in the optional impedance points according to the noise value corresponding to each signal strength scenario, and then an electrical parameter of an impedance device in the antenna matching circuit is determined.
It should be understood that, although the steps in the flowcharts of fig. 1-5 are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least a portion of the steps of fig. 1-5 may include multiple steps or stages that are not necessarily performed at the same time, but may be performed at different times, nor does the order in which the steps or stages are performed necessarily occur sequentially, but may be performed alternately or alternately with at least a portion of the steps or stages in other steps or other steps.
As shown in fig. 6, the embodiment of the present application further provides an impedance adjusting device 600, including:
the load traction module 602 is configured to perform load traction on a power amplifier in the communication device, so as to obtain a first mapping relationship between an impedance value of the antenna matching circuit and an output current of the power amplifier, and a second mapping relationship between the impedance value and an output power of the power amplifier;
the impedance value interval determining module 604 is configured to determine an impedance value interval corresponding to the preset power interval according to the second mapping relationship;
an optional impedance point determining module 606, configured to determine an optional impedance point according to the impedance value interval and the first mapping relationship; the selectable impedance point is an impedance point with an impedance value within an impedance value interval and an output current corresponding to the impedance value smaller than a current threshold value; the current threshold is a corresponding current value when a noise value generated by the power amplifier working in a preset power interval is larger than or equal to the noise threshold.
In one embodiment, as shown in fig. 7, the impedance adjusting apparatus 600 further includes:
a target impedance point determination module 608 for determining one of a plurality of selectable impedance points as a target impedance point;
the electrical parameter determining module 610 is configured to determine an electrical parameter of an impedance device in the antenna matching circuit according to the target impedance point.
In one embodiment, the target impedance point determination module includes:
a noise value acquisition unit for acquiring a noise value of the power amplifier;
a first selection unit for determining a target impedance point among a plurality of selectable impedance points according to the noise value; the noise value is inversely related to the output current corresponding to the target impedance point.
In one embodiment, the target impedance point determination module includes:
the scene simulation unit is used for enabling the power amplifier to work under a plurality of signal intensity scenes;
a noise value acquisition unit for acquiring a noise value generated by a power amplifier operating in each signal intensity scene;
the second selecting unit is used for respectively determining target impedance points in a plurality of selectable impedance points according to the noise value corresponding to each signal intensity scene; the noise value is inversely related to the output current corresponding to the target impedance point.
In one embodiment, the impedance adjusting device further comprises:
the power interval determining module is used for determining a preset power interval according to the signal strength scene.
For specific limitations of the impedance adjusting device, reference may be made to the above limitations of the impedance adjusting method, and no further description is given here. The respective modules in the above-described impedance adjusting apparatus may be implemented in whole or in part by software, hardware, and combinations thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules. It should be noted that, in the embodiment of the present application, the division of the modules is schematic, which is merely a logic function division, and other division manners may be implemented in actual implementation.
In one embodiment, a computer device is provided, comprising a memory and a processor, the memory storing a computer program, the processor implementing the following steps when executing the computer program:
carrying out load traction on a power amplifier in the communication equipment to obtain a first mapping relation between an impedance value of an antenna matching circuit and output current of the power amplifier and a second mapping relation between the impedance value and output power of the power amplifier;
determining an impedance value interval corresponding to a preset power interval according to the second mapping relation;
determining selectable impedance points according to the impedance value interval and the first mapping relation; the selectable impedance point is an impedance point with an impedance value within the impedance value interval and an output current corresponding to the impedance value smaller than a current threshold value; the current threshold is a current value corresponding to a noise value generated by the power amplifier working in the preset power interval when the noise value is greater than or equal to the noise threshold.
In one embodiment, the processor when executing the computer program further performs the steps of:
determining one of a plurality of the selectable impedance points as a target impedance point;
And determining the electrical parameters of the impedance devices in the antenna matching circuit according to the target impedance points.
In one embodiment, the processor when executing the computer program further performs the steps of:
acquiring a noise value of the power amplifier;
determining the target impedance point from a plurality of the selectable impedance points according to the noise value; the noise value is inversely related to the output current corresponding to the target impedance point.
In one embodiment, the processor when executing the computer program further performs the steps of:
operating the power amplifier in a plurality of signal strength scenarios;
acquiring noise values generated by the power amplifier working in each signal intensity scene;
determining target impedance points in a plurality of selectable impedance points according to the noise values corresponding to each signal intensity scene; the noise value is inversely related to the output current corresponding to the target impedance point.
In one embodiment, the processor when executing the computer program further performs the steps of:
determining the preset power interval according to the signal intensity scene; the lower limit value of the preset power interval is equal to the minimum output power required by the power amplifier in each signal strength scene.
In one embodiment, a computer readable storage medium is provided having a computer program stored thereon, which when executed by a processor, performs the steps of:
carrying out load traction on a power amplifier in the communication equipment to obtain a first mapping relation between an impedance value of an antenna matching circuit and output current of the power amplifier and a second mapping relation between the impedance value and output power of the power amplifier;
determining an impedance value interval corresponding to a preset power interval according to the second mapping relation;
determining selectable impedance points according to the impedance value interval and the first mapping relation; the selectable impedance point is an impedance point with an impedance value within the impedance value interval and an output current corresponding to the impedance value smaller than a current threshold value; the current threshold is a current value corresponding to a noise value generated by the power amplifier working in the preset power interval when the noise value is greater than or equal to the noise threshold.
In one embodiment, the computer program when executed by the processor further performs the steps of:
determining one of a plurality of the selectable impedance points as a target impedance point;
And determining the electrical parameters of the impedance devices in the antenna matching circuit according to the target impedance points.
In one embodiment, the computer program when executed by the processor further performs the steps of:
acquiring a noise value of the power amplifier;
determining the target impedance point from a plurality of the selectable impedance points according to the noise value; the noise value is inversely related to the output current corresponding to the target impedance point.
In one embodiment, the computer program when executed by the processor further performs the steps of:
operating the power amplifier in a plurality of signal strength scenarios;
acquiring noise values generated by the power amplifier working in each signal intensity scene;
determining target impedance points in a plurality of selectable impedance points according to the noise values corresponding to each signal intensity scene; the noise value is inversely related to the output current corresponding to the target impedance point.
In one embodiment, the computer program when executed by the processor further performs the steps of:
determining the preset power interval according to the signal intensity scene; the lower limit value of the preset power interval is equal to the minimum output power required by the power amplifier in each signal strength scene.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, or the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory. By way of illustration, and not limitation, RAM can be in the form of a variety of forms, such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), and the like.
As shown in fig. 8, a radio frequency circuit is also provided in the embodiment of the present application. The radio frequency circuitry includes an antenna 810, a power amplifier 820, a radio frequency matching circuit 830, and an antenna matching circuit 840. The radio frequency matching circuit 830 is connected to the power amplifier 820 and the first antenna matching circuit 840, respectively, and the first antenna matching circuit 840 is also connected to the antenna 810. The impedance point of the first antenna matching circuit 840 is selected from the selectable impedance points, which may be determined according to the impedance adjustment method described in any of the above embodiments, to reduce noise generated when the power amplifier 820 operates in the first frequency band.
In one embodiment, antenna 810 may be a directional antenna or a non-directional antenna. By way of example, the antenna may be formed using any suitable type of antenna. For example, antenna 810 may include an antenna with a resonating element formed from the following antenna structure: at least one of an array antenna structure, a loop antenna structure, a patch antenna structure, a slot antenna structure, a helical antenna structure, a strip antenna, a monopole antenna, a dipole antenna, and the like. Different types of antennas may be used for frequency band combinations of different radio frequency signals.
The power amplifier 820 is used for amplifying a radio frequency signal output by a radio frequency transceiver in the communication device or a radio frequency signal received by the antenna 810. The radio frequency matching circuit 830 is used to provide impedance matching with the power amplifier 820. The first antenna matching circuit 840 is for providing impedance matching with the antenna 810. Since the link from the connection between the rf matching circuit 830 and the first antenna matching circuit 840 to the antenna 810 is a common link for receiving and transmitting, the first antenna matching circuit 840 needs to be set for matching only once, and the influence of the antenna 810 on impedance can be considered; the link from the connection between the radio frequency matching circuit 830 and the first antenna matching circuit 840 to the power amplifier 820 comprises separate receive and transmit chains, requiring separate matching of the receive and transmit chains, i.e. the radio frequency matching circuit 830 comprises a part for providing impedance matching for the receive chain and a part for providing impedance matching for the transmit chain.
Specifically, when the radio frequency circuit transmits the radio frequency signal in the first frequency band, under the action of the first antenna matching circuit 840, the noise of the power amplifier 820 can be reduced on the premise of ensuring that the communication quality is stable as much as possible. Wherein the first frequency band may be GSM900.
As shown in fig. 9, in one embodiment, the radio frequency circuit further includes a second antenna matching circuit 850 and a switch circuit 860. Wherein the second antenna matching circuit 850 is connected to the antenna 810; the switch circuit 860 includes a first end and a plurality of second ends, the first end of the switch circuit 860 is connected to the rf matching circuit 840, and the plurality of second ends of the switch circuit 860 are connected to the first antenna matching circuit 840 and the second antenna matching circuit 850, respectively.
The second antenna matching circuit 850 is configured to provide impedance matching with the antenna 810 when the power amplifier 820 is operated in a plurality of frequency bands, including the first frequency band. The switch circuit 860 is used to switch on a path between the radio frequency matching circuit 830 and the first antenna matching circuit 840 or a path between the radio frequency matching circuit 830 and the second antenna matching circuit 850.
The rf circuit does not necessarily generate noise under different power requirements, and the transmit power of different frequency bands will also have a difference, and not all frequency bands will generate noise, however if the impedance of the antenna matching circuit capable of supporting multiple frequency bands is adjusted to overcome the noise problem of one frequency band, the normal use of other frequency bands may be affected. Therefore, the switching circuit 860 is configured to switch between the first antenna matching circuit 840 and the second antenna matching circuit 850, and when the antenna needs to operate in the first frequency band and noise influence exists under the current power requirement, the antenna is switched to the first antenna matching circuit 840; when operation in another frequency band is required, or when operation in the first frequency band is required but there is no noise effect in the current power requirement, the second antenna matching circuit 850 is switched. Therefore, noise generated when the first frequency band works is reduced under the condition that normal use of other frequency bands is not affected.
As shown in fig. 10, in one embodiment, the first antenna matching circuit 840 includes a plurality of antenna matching units 841. A plurality of second terminals of the switch circuit 860 are connected to the plurality of antenna matching units 841 and the second antenna matching circuit 850, respectively.
The antenna matching units 841 are respectively configured to provide impedance matching with different impedance values, so as to reduce noise when the power amplifier 820 generates different noise values, and ensure that the output power of the power amplifier 820 meets the power requirement. The switch circuit 860 is used to switch and conduct the paths between the antenna matching units 841, the second antenna matching circuit 850 and the rf matching circuit 830.
As shown in fig. 11, the radio frequency circuit further includes a noise detection circuit 870 and a control circuit 880. The control circuit 880 is connected to the noise detection circuit 870 and the switch circuit 860, respectively.
The noise detection circuit 870 is configured to detect a noise value of noise generated by the power amplifier 820, and the control circuit 880 is configured to obtain the noise value detected by the noise detection circuit 870, and control the switching circuit 860 to selectively conduct a path between either the antenna matching unit 841 or the second antenna matching circuit 850 and the radio frequency matching circuit 830 according to the noise value.
Specifically, when the noise value is lower than the noise threshold, the control circuit 880 controls the switch circuit 860 to switch on the path between the second antenna matching circuit 850 and the radio frequency matching circuit 830; when the noise value is greater than or equal to the noise threshold value, the path between the antenna matching unit 841 capable of providing impedance matching corresponding to the noise value and the radio frequency matching circuit 830 is selected to be turned on according to the magnitude of the noise value. Wherein the noise value is inversely related to the impedance value of the antenna matching unit 841.
In one embodiment, the control circuit 880 is further configured to determine the signal strength of the signal strength scenario, and control the switching circuit to selectively turn on the path between either the antenna matching unit 841 or the second antenna matching circuit 850 and the rf matching circuit 830 according to the signal strength and the noise value of the power amplifier 820.
When the communication device operates in different signal strength scenarios, the requirements for the output power of the power amplifier 820 are different in order to ensure stable communication quality. Each antenna matching unit 841 is used for providing impedance matching with different impedance values, so as to reduce noise for the power amplifier 820 operating under different signal strength scenarios, and ensure that the output power of the power amplifier 820 meets the power requirement. The switch circuit 860 is used to switch and conduct the paths between the antenna matching units 841, the second antenna matching circuit 850 and the rf matching circuit 830.
Specifically, when the noise value is lower than the noise threshold, the control circuit 880 controls the switch circuit 860 to switch on the path between the second antenna matching circuit 850 and the radio frequency matching circuit 830; when the noise value is greater than or equal to the noise threshold, the signal strength of the signal strength scene where the communication device is located is weaker, the power amplifier 820 needs higher output power to ensure the communication quality, and the path between the antenna matching unit 841 and the radio frequency matching circuit 830, which can provide impedance matching corresponding to the noise value, is selected to be conducted according to the output power requirement and the noise value of the power amplifier 820. Wherein the noise value is inversely related to the impedance value of the antenna matching unit 841.
As shown in fig. 12, an embodiment of the present application further provides a communication device, where the radio frequency circuit in any one of the foregoing embodiments is disposed on the communication device.
The power amplifier in the communication equipment is subjected to load traction to obtain a first mapping relation between the impedance value of the antenna matching circuit and the output current of the power amplifier and a second mapping relation between the impedance value and the output power of the power amplifier, an impedance value interval meeting the power requirement is determined according to a preset power interval and the second mapping relation, and then the first mapping relation is combined to determine a selectable impedance point which can enable the noise value of the power amplifier to be lower than a noise threshold value, so that the impedance point of the first antenna matching circuit is selected, the purpose of reducing current noise on the premise of ensuring communication quality without reducing power as much as possible and without adding an additional noise reduction device, changing a device structure or a circuit structure is achieved, and the implementation is simple and the cost is not increased.
In the description of the present specification, reference to the terms "some embodiments," "one embodiment," "a particular" and the like means that a particular feature, structure, material or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples merely represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.
Claims (13)
1. An impedance adjusting method, characterized by being applied to a communication device; the method comprises the following steps:
carrying out load traction on a power amplifier in the communication equipment to obtain a first mapping relation between an impedance value of an antenna matching circuit and output current of the power amplifier and a second mapping relation between the impedance value and output power of the power amplifier;
determining an impedance value interval corresponding to a preset power interval according to the second mapping relation;
determining selectable impedance points according to the impedance value interval and the first mapping relation; the selectable impedance point is an impedance point with an impedance value within the impedance value interval and an output current corresponding to the impedance value smaller than a current threshold value; the current threshold is a current value corresponding to the noise value generated by the power amplifier working in the preset power interval when the noise value is greater than or equal to the noise threshold; the number of the selectable impedance points is a plurality;
determining a target impedance point among a plurality of selectable impedance points according to the noise value of the power amplifier; the noise value and the output current corresponding to the target impedance point form a negative correlation; or, determining a target impedance point in a plurality of selectable impedance points according to the noise value corresponding to each signal intensity scene; the noise value is inversely related to the output current corresponding to the target impedance point.
2. The impedance adjustment method according to claim 1, characterized in that the method further comprises:
and determining the electrical parameters of the impedance devices in the antenna matching circuit according to the target impedance points.
3. The impedance adjustment method according to claim 1, wherein the step of determining a target impedance point among the plurality of selectable impedance points according to the noise value of the power amplifier further comprises:
and acquiring the noise value of the power amplifier.
4. The impedance adjustment method according to claim 1, wherein the step of determining a target impedance point among the plurality of selectable impedance points according to the noise value corresponding to each signal intensity scene, respectively, further comprises:
operating the power amplifier in a plurality of signal strength scenarios;
and acquiring noise values generated by the power amplifier operating in each signal strength scene.
5. The method of adjusting impedance according to claim 4, wherein before the step of determining an impedance value interval corresponding to a preset power interval according to the second mapping relationship, further comprises:
determining the preset power interval according to the signal intensity scene; the lower limit value of the preset power interval is equal to the minimum output power required by the power amplifier in each signal strength scene.
6. A radio frequency circuit, comprising:
an antenna;
a power amplifier;
the radio frequency matching circuit is connected with the power amplifier and used for providing impedance matching with the power amplifier;
the first antenna matching circuit is respectively connected with the radio frequency matching circuit and the antenna and is used for providing impedance matching with the antenna so as to reduce noise generated when the power amplifier works in a first frequency band;
wherein the target impedance point of the first antenna matching circuit is selected from among selectable impedance points; the target impedance point is determined according to the following steps:
carrying out load traction on the power amplifier to obtain a first mapping relation between an impedance value of a first antenna matching circuit and output current of the power amplifier and a second mapping relation between the impedance value and output power of the power amplifier;
determining an impedance value interval corresponding to a preset power interval according to the second mapping relation;
determining selectable impedance points according to the impedance value interval and the first mapping relation; the selectable impedance point is an impedance point with an impedance value within the impedance value interval and an output current corresponding to the impedance value smaller than a current threshold value; the current threshold is a current value corresponding to the noise value generated by the power amplifier working in the preset power interval when the noise value is greater than or equal to the noise threshold; the number of the selectable impedance points is a plurality;
Determining a target impedance point among a plurality of selectable impedance points according to the noise value of the power amplifier; the noise value and the output current corresponding to the target impedance point form a negative correlation; or, determining a target impedance point in a plurality of selectable impedance points according to the noise value corresponding to each signal intensity scene; the noise value is inversely related to the output current corresponding to the target impedance point.
7. The radio frequency circuit of claim 6, further comprising:
a second antenna matching circuit connected to the antenna for providing impedance matching with the antenna when the power amplifier operates in a plurality of frequency bands including the first frequency band, respectively;
the switch circuit comprises a first end and a plurality of second ends, wherein the first end of the switch circuit is connected with the radio frequency matching circuit, the plurality of second ends of the switch circuit are respectively connected with the first antenna matching circuit and the second antenna matching circuit, and the switch circuit is used for switching on a passage between the radio frequency matching circuit and the first antenna matching circuit or a passage between the radio frequency matching circuit and the second antenna matching circuit.
8. The radio frequency circuit of claim 7, wherein the first antenna matching circuit comprises:
a plurality of antenna matching units for providing impedance matching of different impedance values, respectively, so as to reduce noise when the power amplifier generates noise values of different magnitudes;
and a plurality of second ends of the switch circuit are respectively connected with a plurality of antenna matching units and the second antenna matching circuit.
9. The radio frequency circuit of claim 8, further comprising:
a noise detection circuit for detecting a noise value of noise generated by the power amplifier;
and the control circuit is respectively connected with the noise detection circuit and the switching circuit and is used for controlling the switching circuit to selectively conduct any one of the paths between the antenna matching unit or the second antenna matching circuit and the radio frequency matching circuit according to the noise value.
10. The radio frequency circuit of claim 9, further comprising:
the control circuit is also used for determining the signal intensity of a signal intensity scene, and controlling the switching circuit to selectively conduct any one of the antenna matching units or the paths between the second antenna matching circuit and the radio frequency matching circuit according to the signal intensity and the noise value.
11. A communication device comprising a radio frequency circuit as claimed in any one of claims 6 to 10.
12. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any one of claims 1 to 5 when the computer program is executed.
13. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 5.
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