CN113922830A - Impedance adjusting method, radio frequency circuit, communication device and computer device - Google Patents
Impedance adjusting 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
- H04B1/02—Transmitters
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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
- H04B1/04—Circuits
- 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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- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The application relates to an impedance adjusting method, a radio frequency circuit, communication equipment and computer equipment. The 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 the output current of the power amplifier and a second mapping relation between the impedance value and the output power of the power amplifier; determining an impedance value interval corresponding to the 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; the current threshold is a current value corresponding to a noise value generated by the power amplifier working in a preset power interval and larger than or equal to the noise threshold. The current noise generated by the low power amplifier can be reduced on the premise of ensuring the communication quality.
Description
Technical Field
The present application relates to the field of radio frequency technologies, and in particular, to an impedance adjusting method, a radio frequency circuit, a communication device, and a computer device.
Background
With the continuous development of radio frequency technology, the quality requirement of the communication equipment for the transmitted signal is higher and higher, thereby bringing great challenges to the design of radio frequency circuits.
When the radio frequency circuit works in some frequency bands requiring high transmission Power, the current at the output end of a Power Amplifier (PA) in the radio frequency circuit is high, so that high current noise is generated during communication, and if the output Power of the PA is directly reduced to improve the current noise, the communication quality may be affected.
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 low-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 an output current of the power amplifier and a second mapping relation between the impedance value and the output power of the power amplifier;
determining an impedance value interval corresponding to a preset power interval according to the second mapping relation;
determining a selectable impedance point according to the impedance value interval and the first mapping relation; the selectable impedance point is an impedance point of which the impedance value is within the impedance value interval and the output current corresponding to the impedance value is smaller than the current threshold value; the current threshold is a corresponding current value when the noise value generated by the power amplifier working in the preset power interval is larger 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 is 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 an impedance point of the first antenna matching circuit is selected among selectable impedance points; the selectable 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 the output current of the power amplifier and a second mapping relation between the impedance value and the output power of the power amplifier;
determining an impedance value interval corresponding to a preset power interval according to the second mapping relation;
determining a selectable impedance point according to the impedance value interval and the first mapping relation; the selectable impedance point is an impedance point of which the impedance value is within the impedance value interval and the output current corresponding to the impedance value is smaller than the current threshold value; the current threshold is a corresponding current value when the noise value generated by the power amplifier working in the preset power interval is larger than or equal to the noise threshold.
A communication device comprising a radio frequency circuit as described above.
A computer device 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 an output current of the power amplifier and a second mapping relation between the impedance value and the output power of the power amplifier;
determining an impedance value interval corresponding to a preset power interval according to the second mapping relation;
determining a selectable impedance point according to the impedance value interval and the first mapping relation; the selectable impedance point is an impedance point of which the impedance value is within the impedance value interval and the output current corresponding to the impedance value is smaller than the current threshold value; the current threshold is a corresponding current value when the noise value generated by the power amplifier working in the preset power interval is larger than or equal to the noise threshold.
A computer-readable storage medium, on which a computer program is stored which, when executed by a processor, carries out 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 an output current of the power amplifier and a second mapping relation between the impedance value and the output power of the power amplifier;
determining an impedance value interval corresponding to a preset power interval according to the second mapping relation;
determining a selectable impedance point according to the impedance value interval and the first mapping relation; the selectable impedance point is an impedance point of which the impedance value is within the impedance value interval and the output current corresponding to the impedance value is smaller than the current threshold value; the current threshold is a corresponding current value when the noise value generated by the power amplifier working in the preset power interval is larger 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 by 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, the selectable impedance point which can enable the noise value of the power amplifier to be lower than the noise threshold value is determined by combining the first mapping relation, the impedance point of the antenna matching circuit is selected, and therefore the purposes that the power is not reduced as far as possible, the current noise is reduced on the premise that the communication quality is guaranteed, additional noise reduction devices are not needed, the structure of the devices is not needed to be changed, or the structure of the circuits is not needed to be changed, the implementation is simple, and the cost is not needed to be increased are achieved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic flow chart of an impedance adjusting method according to an embodiment;
FIG. 2 is a schematic flow chart of an impedance adjusting method according to another embodiment;
FIG. 3 is a flowchart illustrating the step of determining one of a plurality of selectable impedance points as a target impedance point according to one embodiment;
FIG. 4 is a schematic flowchart of 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 schematic flow chart illustrating an impedance adjusting method according to yet another embodiment;
FIG. 6 is a block diagram of an impedance adjusting apparatus according to an embodiment;
fig. 7 is a block diagram showing the structure of an impedance adjusting apparatus according to another embodiment;
FIG. 8 is a block diagram of an embodiment of an RF circuit;
FIG. 9 is a second block diagram of the RF circuit according to an embodiment;
FIG. 10 is a third block diagram illustrating an exemplary RF circuit;
FIG. 11 is a block diagram of an embodiment of an RF circuit;
fig. 12 is a schematic structural diagram of a communication device according to an embodiment.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth 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 present 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 herein to describe various features, but these features are not limited by these terms. These terms are only used to distinguish one feature from another.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited 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 is understood to mean "electrical connection", "communication connection", or the like, if there is a transfer of electrical signals or data between the connected objects.
As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" or "comprising," or the like, specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Also, as used in this specification, the term "and/or" includes any and all combinations of the associated listed items.
In one embodiment, the communication Device may be a Mobile phone, a tablet computer, a notebook computer, a palmtop computer, a Mobile Internet Device (MID), a wearable Device (e.g., a smart watch, a smart bracelet, a pedometer, etc.), or another communication Device provided with an antenna matching circuit.
As shown in fig. 1, an embodiment of the present application provides an impedance adjusting method, including steps 101 to 103, where:
step 101, performing load traction on a power amplifier in the communication device 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.
The load traction is to obtain working parameters of the device under different input end impedances and output end impedances by continuously adjusting an input end impedance and an output end impedance of an active device (in this application, a power amplifier is specifically referred to in this application), and in this application, the load traction 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), and further determining a corresponding relationship between the different impedances and an output current and an output power of the power amplifier, that is, obtaining a first mapping relationship between an impedance value and the output current, and a second mapping relationship between the impedance value and the output power.
And 102, determining an impedance value interval corresponding to the preset power interval according to the second mapping relation.
The lower limit of the power value of the preset power interval is the minimum power for ensuring the communication quality of the communication equipment to be stable, and the upper limit of the power value can be the maximum power meeting the power consumption requirement of the communication equipment. The impedance value interval capable of ensuring the communication quality temperature of the communication device can be determined based on the preset power interval and the second mapping relation.
And 103, determining a selectable impedance point according to the impedance value interval and the first mapping relation.
The selectable impedance point is an impedance point of which the impedance value is within the impedance value interval and the output current corresponding to the impedance value is smaller than the current threshold value; the current threshold is a current value corresponding to a noise value generated by the power amplifier working in a preset power interval and larger than or equal to the noise threshold.
And determining an optional impedance point, in combination with a first mapping relation related to the output current, of the output current smaller than the current threshold value in the impedance value interval determined based on the preset power interval. Because the impedance value is in nonlinear correlation with the output power and the output current, an optional 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 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 of the antenna matching circuit and the output power, an impedance value interval meeting the power requirement is determined according to a preset power interval and the second mapping relation, and then an optional impedance point capable of enabling the noise value of the power amplifier to be lower than a noise threshold value is determined by combining the first mapping relation to select the impedance point of the antenna matching circuit, so that the power is not reduced as much as possible, the current noise is reduced on the premise of ensuring the communication quality, an additional noise reduction device is not required to be added, the structure of the device 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 multiple, and the impedance adjusting method includes steps 201 to 205, where:
step 201, performing load pulling on a power amplifier in the communication device, and obtaining a first mapping relation between an impedance value of the 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.
Step 203, determining a selectable impedance point according to the impedance value interval and the first mapping relation. The selectable impedance point is an impedance point of which the impedance value is within the impedance value interval and the output current corresponding to the impedance value is smaller than the current threshold value; the current threshold is a current value corresponding to a noise value generated by the power amplifier working in a preset power interval and larger than or equal to the noise threshold.
In step 204, one of the plurality of selectable impedance points is determined as a target impedance point.
Step 205, determining the electrical parameters of the impedance device in the antenna matching circuit according to the target impedance point.
In some embodiments, there are a plurality of impedance points in the impedance value interval, where the impedance points satisfy that the output current is smaller than the current resistance value, and one of the impedance points may be selected as a target impedance point according to the working requirement of the power amplifier to determine the electrical parameter of the impedance device in the antenna matching circuit. The impedance device may include at least one of a capacitor, an inductor, and a resistor, and when the impedance device includes a capacitor, the electrical parameter includes a capacitance value of the capacitor; when the impedance device comprises an inductor, the electrical parameter comprises an inductance value of the inductor; when the impedance device comprises a resistor, the electrical parameter comprises a resistance value of the resistor; when the impedance device includes two or more devices, the electrical parameters further include the connection relationship between the devices, for example, when the impedance device includes a capacitor and an inductor, the capacitor and the inductor are arranged in series or in parallel.
As shown in fig. 3, in one embodiment, the step of determining one of the selectable impedance points as the target impedance point includes steps 301 to 302, where:
step 301, acquiring a noise value of the power amplifier.
Step 302, determining a target impedance point in a plurality of selectable impedance points according to the noise value; the noise value is in a negative correlation with the output current corresponding to the target impedance point.
In this embodiment, a noise value of noise generated by the power amplifier during operation may be obtained, and the target impedance point may be determined among the selectable impedance points based on the noise value. If the noise value is larger, a corresponding target impedance point with smaller output current can be selected to reduce the noise caused by the output current; if the noise value is small, the corresponding target impedance point with large 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 selectable impedance points as the target impedance point includes steps 401 to 403, where:
step 401, the power amplifier is operated under a plurality of signal strength scenes.
The communication equipment has different signal strengths under different signal strength scenes, and when the communication equipment works under different signal strength scenes, the requirements on the output power of the power amplifier are different in order to ensure stable communication quality. If the signal intensity of the signal intensity scene where the communication equipment is located is weak, the power amplifier needs higher output power to ensure the communication quality; if the signal intensity of the signal intensity scene where the communication equipment is located is strong, the power amplifier can adopt low output power to ensure the communication quality. The signal strength scene where the communication equipment is located can be changed in a scene simulating mode, and therefore the power amplifier can work under a plurality of signal strength scenes.
Step 402, noise values generated by the power amplifier operating in each signal strength scenario are obtained.
When the communication equipment works in each signal intensity scene, the output power requirements of the power amplifiers may be different, and the noise value generated by the power amplifiers also changes, so that the noise value generated by the power amplifiers in each signal intensity scene can be acquired to select a target impedance point for the communication equipment working in different signal intensity scenes.
Step 403, respectively determining a target impedance point from a plurality of selectable impedance points according to the noise value corresponding to each signal intensity scene.
And selecting a corresponding target impedance point from the selectable impedance points according to the noise value of the noise generated by the power amplifier under each signal intensity scene, and further selecting a plurality of antenna matching circuits for the communication equipment, wherein the antenna matching circuits are respectively used under different signal intensity scenes, so that the noise of the power amplifier is reduced.
As shown in fig. 5, in one embodiment, the impedance adjusting method includes steps 501 to 508, where:
step 501, performing load pulling on a power amplifier in the communication device, and obtaining 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 intensity scene; the lower limit value of the preset power interval is equal to the minimum output power required by the power amplifier under each signal intensity scene.
Step 503, determining an impedance value interval corresponding to the preset power interval according to the second mapping relationship.
Step 504, determining a selectable 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; the current threshold is a current value corresponding to a noise value generated by the power amplifier working in a preset power interval and larger than or equal to the noise threshold.
And 505, enabling the power amplifier to work under a plurality of signal strength scenes.
At step 506, noise values generated by the power amplifier operating in each signal strength scenario are obtained.
Step 507, 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 in a negative correlation with the output current corresponding to the target impedance point.
And step 508, determining the electrical parameters of the impedance device 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 in different signal strength scenes, a preset power interval may be determined according to the lowest output power of the power amplifier in each signal strength scene, and then an impedance value interval is determined according to the preset power interval and the second mapping relationship, 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 relationship, and then a target impedance point is determined in the optional impedance point according to the noise value corresponding to each signal strength scene, so as to determine the electrical parameter of the impedance device in the antenna matching circuit.
It should be understood that although the various steps in the flowcharts of fig. 1-5 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 1-5 may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed in turn or alternately with other steps or at least some of the other steps or stages.
As shown in fig. 6, an embodiment of the present application further provides an impedance adjusting apparatus 600, including:
a load pulling module 602, configured to perform load pulling 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;
an impedance value interval determining module 604, configured to determine an impedance value interval corresponding to the preset power interval according to the second mapping relationship;
a selectable impedance point determining module 606, configured to determine a selectable 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; the current threshold is a current value corresponding to a noise value generated by the power amplifier working in a preset power interval and 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 comprises:
the noise value acquisition unit is used for acquiring a noise value of the power amplifier;
a first selection unit for determining a target impedance point among the plurality of selectable impedance points according to a noise value; the noise value is in a negative correlation with the output current corresponding to the target impedance point.
In one embodiment, the target impedance point determination module comprises:
a scene simulation unit for operating the power amplifier in a plurality of signal strength scenes;
the noise value acquisition unit is used for acquiring noise values generated by the power amplifiers working under each signal intensity scene;
the second selection unit is used for respectively determining a target impedance point in the plurality of selectable impedance points according to the noise value corresponding to each signal intensity scene; the noise value is in a negative correlation with the output current corresponding to the target impedance point.
In one embodiment, the impedance adjusting apparatus further includes:
and the power interval determining module is used for determining a preset power interval according to the signal intensity scene.
For the specific definition of the impedance adjusting device, reference may be made to the above definition of the impedance adjusting method, which is not described herein again. The modules in the impedance adjusting apparatus may be implemented in whole or in part by software, hardware, and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules. It should be noted that, in the embodiment of the present application, the division of the module is schematic, and is only one logic function division, and there may be another division manner in actual implementation.
In one embodiment, a computer device is provided, comprising a memory and a processor, the memory having a computer program stored therein, 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 an output current of the power amplifier and a second mapping relation between the impedance value and the output power of the power amplifier;
determining an impedance value interval corresponding to a preset power interval according to the second mapping relation;
determining a selectable impedance point according to the impedance value interval and the first mapping relation; the selectable impedance point is an impedance point of which the impedance value is within the impedance value interval and the output current corresponding to the impedance value is smaller than the current threshold value; the current threshold is a corresponding current value when the noise value generated by the power amplifier working in the preset power interval is larger 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 device in the antenna matching circuit according to the target impedance point.
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 the noise value in a plurality of selectable impedance points; and the noise value and the output current corresponding to the target impedance point form a negative correlation relationship.
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 amplifiers working under each signal intensity scene;
respectively determining a target impedance point in the selectable impedance points according to the noise value corresponding to each signal intensity scene; and the noise value and the output current corresponding to the target impedance point form a negative correlation relationship.
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 lowest output power required by the power amplifier under each signal intensity scene.
In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored, 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 an output current of the power amplifier and a second mapping relation between the impedance value and the output power of the power amplifier;
determining an impedance value interval corresponding to a preset power interval according to the second mapping relation;
determining a selectable impedance point according to the impedance value interval and the first mapping relation; the selectable impedance point is an impedance point of which the impedance value is within the impedance value interval and the output current corresponding to the impedance value is smaller than the current threshold value; the current threshold is a corresponding current value when the noise value generated by the power amplifier working in the preset power interval is larger 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 device in the antenna matching circuit according to the target impedance point.
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 the noise value in a plurality of selectable impedance points; and the noise value and the output current corresponding to the target impedance point form a negative correlation relationship.
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 amplifiers working under each signal intensity scene;
respectively determining a target impedance point in the selectable impedance points according to the noise value corresponding to each signal intensity scene; and the noise value and the output current corresponding to the target impedance point form a negative correlation relationship.
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 lowest output power required by the power amplifier under each signal intensity scene.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.
As shown in fig. 8, an embodiment of the present application further provides a radio frequency circuit. The radio frequency circuit comprises an antenna 810, a power amplifier 820, a radio frequency matching circuit 830 and an antenna matching circuit 840. The rf matching circuit 830 is connected to the power amplifier 820 and the first antenna matching circuit 840, and the first antenna matching circuit 840 is further connected to the antenna 810. The impedance point of the first antenna matching circuit 840 is selected from selectable impedance points, which may be determined according to any of the impedance adjusting methods described in the embodiments above, so as to reduce noise generated when the power amplifier 820 operates in the first frequency band.
In one embodiment, the antenna 810 may be a directional antenna or a non-directional antenna. Illustratively, 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 combining of different radio frequency signals.
The power amplifier 820 is used for amplifying the rf signal output by the rf transceiver or received by the antenna 810 in the communication device. The rf matching circuit 830 is used to provide impedance matching with the power amplifier 820. The first antenna matching circuit 840 serves to provide 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 reception and transmission, the first antenna matching circuit 840 only needs to be set for matching once, and the influence of the antenna 810 on the 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 section for providing impedance matching for the receive chain and a section for providing impedance matching for the transmit chain.
Specifically, when the rf circuit transmits the rf signal of the first frequency band, the noise of the power amplifier 820 can be reduced under the effect of the first antenna matching circuit 840 on the premise of ensuring the stability of the communication quality as much as possible. Wherein the first frequency band may be GSM 900.
As shown in fig. 9, in one embodiment, the rf circuit further includes a second antenna matching circuit 850 and a switch circuit 860. The second antenna matching circuit 850 is connected to the antenna 810; the switch circuit 860 includes a first terminal and a plurality of second terminals, the first terminal of the switch circuit 860 is connected to the rf matching circuit 840, and the plurality of second terminals 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 operates in a plurality of frequency bands, including the first frequency band. The switch circuit 860 is used to switch on a path between the rf matching circuit 830 and the first antenna matching circuit 840 or a path between the rf matching circuit 830 and the second antenna matching circuit 850.
In the rf circuit, under different power requirements, the power amplifier 820 may not generate noise, and the transmission power of different frequency bands may also be different, and not all frequency bands may 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, in the present embodiment, the switch 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 there is noise influence under the current power requirement, the antenna is switched to the first antenna matching circuit 840; when it is desired to operate in other frequency bands, or when it is desired to operate in the first frequency band but there is no noise effect due to the current power requirement, the second antenna matching circuit 850 is switched to. Therefore, the noise generated when the first frequency band works is reduced under the condition that the normal use of other frequency bands is not influenced.
As shown in fig. 10, in one embodiment, the first antenna matching circuit 840 includes a plurality of antenna matching units 841. The 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 noise values with different magnitudes, 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 and 850, and the rf matching circuit 830.
As shown in fig. 11, the rf 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 the 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 switch circuit 860 to selectively turn on a path between any one of the antenna matching unit 841 and the rf matching circuit 830 or a path between any one of the second antenna matching circuit 850 and the rf 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 rf matching circuit 830; when the noise value is greater than or equal to the noise threshold value, a path between the antenna matching unit 841 and the rf matching circuit 830, which can provide impedance matching corresponding to the noise value, is selectively conducted according to the magnitude of the noise value. Wherein the noise value is in a negative correlation with 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 switch circuit to selectively turn on a path between any one of the antenna matching unit 841 and the second antenna matching circuit 850 and the rf matching circuit 830 according to the signal strength and the noise level 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 respectively configured to provide impedance matching with different impedance values, so as to reduce noise for the power amplifier 820 operating in 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 and 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 rf 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 weak, the power amplifier 820 needs high output power to ensure the communication quality, and a 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 in a negative correlation with 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 of the above embodiments is disposed on the communication device.
The method comprises the steps of obtaining 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 of the antenna matching circuit and the output power through load traction of the power amplifier in the communication equipment, determining an impedance value interval meeting power requirements according to a preset power interval and the second mapping relation, determining an optional impedance point which can enable a noise value of the power amplifier to be lower than a noise threshold value by combining the first mapping relation, and selecting the impedance point of the first antenna matching circuit to further achieve the purposes of not reducing the power as much as possible and reducing the current noise on the premise of ensuring the communication quality, and does not need to add an additional noise reduction device, change a device structure or change a circuit structure, so that the method is simple to achieve and does not need to increase the cost.
In the description herein, reference to the description of the terms "some embodiments," "one of the embodiments," "specific," etc., 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, a schematic description of the above terminology may not necessarily refer to the same embodiment or example.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
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 an output current of the power amplifier and a second mapping relation between the impedance value and the output power of the power amplifier;
determining an impedance value interval corresponding to a preset power interval according to the second mapping relation;
determining a selectable impedance point according to the impedance value interval and the first mapping relation; the selectable impedance point is an impedance point of which the impedance value is within the impedance value interval and the output current corresponding to the impedance value is smaller than the current threshold value; the current threshold is a corresponding current value when the noise value generated by the power amplifier working in the preset power interval is larger than or equal to the noise threshold.
2. The impedance adjustment method according to claim 1, wherein the number of the selectable impedance points is plural;
the method further comprises the following steps:
determining one of a plurality of the selectable impedance points as a target impedance point;
and determining the electrical parameters of the impedance device in the antenna matching circuit according to the target impedance point.
3. The impedance adjustment method of claim 2, wherein the step of determining one of the plurality of selectable impedance points as a target impedance point comprises:
acquiring a noise value of the power amplifier;
determining the target impedance point from the noise value in a plurality of selectable impedance points; and the noise value and the output current corresponding to the target impedance point form a negative correlation relationship.
4. The impedance adjustment method of claim 2, wherein the step of defining one of the plurality of selectable impedance points as a target impedance point comprises:
operating the power amplifier in a plurality of signal strength scenarios;
acquiring noise values generated by the power amplifiers working under each signal intensity scene;
respectively determining a target impedance point in the selectable impedance points according to the noise value corresponding to each signal intensity scene; and the noise value and the output current corresponding to the target impedance point form a negative correlation relationship.
5. The impedance adjusting method according to claim 4, wherein the step of determining the impedance value interval corresponding to the 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 lowest output power required by the power amplifier under each signal intensity scene.
6. A radio frequency circuit, comprising:
an antenna;
a power amplifier;
the radio frequency matching circuit is connected with the power amplifier and is 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 an impedance point of the first antenna matching circuit is selected among selectable impedance points; the selectable 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 the output current of the power amplifier and a second mapping relation between the impedance value and the output power of the power amplifier;
determining an impedance value interval corresponding to a preset power interval according to the second mapping relation;
determining a selectable impedance point according to the impedance value interval and the first mapping relation; the selectable impedance point is an impedance point of which the impedance value is within the impedance value interval and the output current corresponding to the impedance value is smaller than the current threshold value; the current threshold is a corresponding current value when the noise value generated by the power amplifier working in the preset power interval is larger than or equal to the noise threshold.
7. The radio frequency circuit of claim 6, further comprising:
the second antenna matching circuit is connected with the antenna and used for providing impedance matching with the antenna when the power amplifier works under a plurality of frequency bands including the first frequency band;
the switch circuit comprises a first end and a plurality of second ends, 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 path between the radio frequency matching circuit and the first antenna matching circuit or a path 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:
the antenna matching units are respectively used for providing impedance matching of different impedance values so as to reduce noise when the power amplifier generates noise values with different sizes;
and a plurality of second ends of the switch circuit are respectively connected with the plurality of antenna matching units and the second antenna matching circuit.
9. The radio frequency circuit of claim 8, further comprising:
the noise detection circuit is used for detecting the noise value of the noise generated by the power amplifier;
and the control circuit is respectively connected with the noise detection circuit and the switch circuit and is used for controlling the switch circuit to selectively conduct a path between any one of the antenna matching units 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 further configured to determine the signal strength of the signal strength scene, and control the switch circuit to selectively turn on a path between any one of the antenna matching unit or the second antenna matching circuit and the radio frequency matching circuit according to the signal strength 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, when executing the computer program, implements the steps of the method of any of claims 1 to 5.
13. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 5.
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