CN110492951B - Radio frequency feedback detection circuit, antenna assembly and electronic equipment - Google Patents
Radio frequency feedback detection circuit, antenna assembly and electronic equipment Download PDFInfo
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- CN110492951B CN110492951B CN201910713414.1A CN201910713414A CN110492951B CN 110492951 B CN110492951 B CN 110492951B CN 201910713414 A CN201910713414 A CN 201910713414A CN 110492951 B CN110492951 B CN 110492951B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/101—Monitoring; Testing of transmitters for measurement of specific parameters of the transmitter or components thereof
- H04B17/102—Power radiated at antenna
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/101—Monitoring; Testing of transmitters for measurement of specific parameters of the transmitter or components thereof
- H04B17/103—Reflected power, e.g. return loss
Abstract
The application discloses radio frequency feedback detection circuitry, antenna module and electronic equipment, this radio frequency feedback detection circuitry includes: the radio frequency circuit comprises a radio frequency output end and a feedback receiving end; the output end of the antenna tuning circuit is coupled with the antenna; the isolation circuit is coupled to the radio frequency output end of the radio frequency circuit, the input end of the antenna tuning circuit and the feedback receiving end of the radio frequency circuit, and is used for forming a signal transmitting path from the radio frequency output end to the antenna tuning circuit and forming a signal reflecting path from the antenna tuning circuit to the feedback receiving end. By the mode, the interference of the reflected signal can be prevented, and the accuracy of signal detection is improved.
Description
Technical Field
The present application relates to the field of radio frequency technologies, and in particular, to a radio frequency feedback detection circuit, an antenna assembly, and an electronic device.
Background
When the electronic device performs radio frequency communication, due to changes in communication environment, such as changes in temperature of the electronic device from indoor to outdoor, changes in hand holding posture, etc., the state of a radio frequency link in the electronic device fluctuates, most typically, gain changes and antenna impedance changes of the radio frequency link, and if an internal link of the electronic device is not adjusted in time, the communication quality of the electronic device is affected.
Disclosure of Invention
The technical scheme adopted by the application is as follows: there is provided a radio frequency feedback detection circuit, comprising: the radio frequency circuit comprises a radio frequency output end and a feedback receiving end; the output end of the antenna tuning circuit is coupled with the antenna; the isolation circuit is coupled to the radio frequency output end of the radio frequency circuit, the input end of the antenna tuning circuit and the feedback receiving end of the radio frequency circuit, and is used for forming a signal transmitting path from the radio frequency output end to the antenna tuning circuit and forming a signal reflecting path from the antenna tuning circuit to the feedback receiving end.
Another technical scheme adopted by the application is as follows: an antenna assembly is provided, the antenna assembly comprising an antenna and a radio frequency feedback detection circuit; wherein, the radio frequency feedback detection circuit includes: the radio frequency circuit comprises a radio frequency output end and a feedback receiving end; the output end of the antenna tuning circuit is coupled with the antenna; the isolation circuit is coupled to the radio frequency output end of the radio frequency circuit, the input end of the antenna tuning circuit and the feedback receiving end of the radio frequency circuit, and is used for forming a signal transmitting path from the radio frequency output end to the antenna tuning circuit and forming a signal reflecting path from the antenna tuning circuit to the feedback receiving end.
Another technical scheme adopted by the application is as follows: an electronic device is provided, which comprises the radio frequency feedback detection circuit as described above.
The application provides a radio frequency feedback detection circuit includes: the radio frequency circuit comprises a radio frequency output end and a feedback receiving end; the output end of the antenna tuning circuit is coupled with the antenna; the isolation circuit is coupled to the radio frequency output end of the radio frequency circuit, the input end of the antenna tuning circuit and the feedback receiving end of the radio frequency circuit, and is used for forming a signal transmitting path from the radio frequency output end to the antenna tuning circuit and forming a signal reflecting path from the antenna tuning circuit to the feedback receiving end. By the mode, the isolation circuit is additionally arranged in the circuit, so that the transmitting signal and the reflected signal can be isolated, and the two signals cannot be influenced mutually. Further, since other power devices may be disposed between the rf circuit 11 and the isolation circuit 13, the reflected signal may also be prevented from affecting the power devices. In addition, when the power of the transmitted signal and the reflected signal is detected, the accuracy of signal power detection can be improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts. Wherein:
fig. 1 is a schematic diagram of a first structure of an rf feedback detection circuit according to an embodiment of the present disclosure;
FIG. 2 is a schematic structural diagram of a circulator provided by an embodiment of the application;
fig. 3 is a schematic diagram of a second structure of the rf feedback detection circuit according to the embodiment of the present application;
fig. 4 is a schematic structural diagram of a directional coupler provided in an embodiment of the present application;
FIG. 5 is a schematic diagram of a third structure of an RF feedback detection circuit according to an embodiment of the present application;
fig. 6 is a schematic diagram of a fourth structure of the rf feedback detection circuit according to the embodiment of the present application;
fig. 7 is a schematic diagram of a fifth structure of a rf feedback detection circuit according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of an antenna assembly provided by an embodiment of the present application;
fig. 9 is a schematic structural diagram of an electronic device provided in an embodiment of the present application.
Detailed Description
Referring to fig. 1, fig. 1 is a schematic diagram of a first structure of an rf feedback detection circuit according to an embodiment of the present disclosure, where the rf feedback detection circuit 10 includes an rf circuit 11, an antenna tuning circuit 12, and an isolation circuit 13.
The radio frequency circuit 11 comprises a radio frequency output end 11a and a feedback receiving end 11 b; the rf output terminal 11a is used for outputting a transmission signal, and the feedback receiving terminal 11b is used for receiving a reflection signal. The output terminal of the antenna tuning circuit 12 is coupled to the antenna 20; the antenna tuning circuit 12 is specifically used to adjust the impedance of the antenna 20.
The isolation circuit 13 is coupled to the rf output terminal 11a of the rf circuit 11, the input terminal of the antenna tuning circuit 12, and the feedback receiving terminal 11b of the rf circuit 11, and is configured to form a signal transmitting path from the rf output terminal 11a to the antenna tuning circuit 12, and form a signal reflecting path from the antenna tuning circuit 12 to the feedback receiving terminal 11 b.
Specifically, when a signal is transmitted, the transmission signal is output through the rf output terminal 11a, the antenna tuning circuit 12 is output through the isolation circuit 13, and since there is no path from the rf output terminal 11a to the feedback receiving terminal 11b in the isolation circuit 12, the transmission signal cannot reach the feedback receiving terminal 11 b. Further, when the signal is reflected, the reflected signal reaches the feedback receiving terminal 11b through the antenna 20, the antenna tuning circuit 12, and the isolation circuit 13, and since there is no path from the antenna tuning circuit 12 to the rf output terminal 11a in the isolation circuit 13, the reflected signal cannot reach the rf output terminal 11 a.
Optionally, in an embodiment, the isolation circuit 13 comprises a circulator. As shown in fig. 2, fig. 2 is a schematic structural diagram of a circulator provided by an embodiment of the present application.
The circulator 13a includes a first end 13a1, a second end 13a2, and a third end 13a3, wherein the circulator 13a is configured to form a forward signal path from the first end 13a1 to the second end 13a2 and to form a forward signal path from the second end 13a2 to the third end 13a 3. And the reverse signal path from the first end 13a1 to the second end 13a2, the reverse signal path from the second end 13a2 to the third end 13a3, and the forward and reverse signal path from the first end 13a1 and the third end 13a3 are isolated, i.e., do not allow signals to pass through.
Specifically, the first end 13a1 of the circulator 13a is coupled to the rf output end 11a, and the second end 13a2 of the circulator 13a is coupled to the input end of the antenna tuning circuit 12, so as to form a signal transmission path from the rf output end 11a to the antenna tuning circuit 12; the second terminal 13a2 of the circulator 13a is coupled to the input terminal of the antenna tuning circuit 12, and the third terminal 13a3 of the circulator 13a is coupled to the feedback receiving terminal 11b, so as to form a signal reflection path from the antenna tuning circuit 12 to the feedback receiving terminal 11 b.
In the above embodiment, since the isolation circuit is added to the circuit, the transmission signal and the reflection signal can be isolated from each other, and the two signals do not affect each other. Further, since other power devices may be disposed between the rf circuit 11 and the isolation circuit 13, the reflected signal may also be prevented from affecting the power devices. In addition, when the power of the transmitted signal and the reflected signal is detected, the accuracy of signal power detection can be improved.
Referring to fig. 3, fig. 3 is a schematic diagram of a second structure of the rf feedback detection circuit according to the embodiment of the present application, where the rf feedback detection circuit 10 includes an rf circuit 11, an antenna tuning circuit 12, an isolation circuit 13, and a directional coupler 14.
The rf circuit 11 includes an rf output terminal 11a, a first feedback receiving terminal 11b1, and a second feedback receiving terminal 11b 2.
The directional coupler is a microwave device widely used in microwave systems, and essentially distributes power of microwave signals according to a certain proportion. Referring to fig. 4, fig. 4 is a schematic structural diagram of a directional coupler according to an embodiment of the present application, in which the directional coupler 14 is composed of two closely spaced conductive lines, including a first conductive line L1 and a second conductive line L2, and further includes an input end 14a, an output end 14b, a coupling end 14c, and an isolation end 14 d.
The input terminal 14a of the directional coupler 14 is coupled to the rf output terminal 11a, the output terminal 14b of the directional coupler 14 is coupled to the isolation circuit 13, the coupling terminal 14c of the directional coupler 14 is coupled to the first feedback receiving terminal 11b1, and the isolation terminal 14d of the directional coupler 14 is coupled to the load R.
In addition, the isolation circuit 13 is coupled to the second feedback receiving terminal.
Specifically, when the signal is transmitted, the transmission signal is output through the radio frequency output terminal 11a, when the transmission signal passes through the directional coupler 14, most of the signal is output through the output terminal 14b of the directional coupler 14 and is output to the antenna tuning circuit 12 through the isolation circuit 13, and a small part of the signal is transmitted to the first feedback receiving terminal 11b1 through the coupling terminal 14c of the directional coupler 14 due to the coupling effect.
Therefore, the power of the transmitted signal can be detected by calculating the signal received by the first feedback receiving end 11b 1.
Specifically, when the signal is reflected, the reflected signal reaches the second feedback receiving terminal 11b2 through the antenna 20, the antenna tuning circuit 12, and the isolation circuit 13, and since there is no path from the antenna tuning circuit 12 to the radio frequency output terminal 11a in the isolation circuit 13, the reflected signal cannot reach the radio frequency output terminal 11 a.
Referring to fig. 5, fig. 5 is a schematic diagram of a third structure of an rf feedback detection circuit provided in an embodiment of the present application, where the rf feedback detection circuit 10 includes an rf circuit 11, an antenna tuning circuit 12, an isolation circuit 13, a directional coupler 14, and a single-pole double-throw switch 15.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a directional coupler according to an embodiment of the present application, in which the directional coupler 14 is composed of two closely spaced conductive lines, including a first conductive line L1 and a second conductive line L2, and further includes an input end 14a, an output end 14b, a coupling end 14c, and an isolation end 14 d.
The input end 14a of the directional coupler 14 is coupled to the rf output end 11a, the output end 14b of the directional coupler 14 is coupled to the isolation circuit 13, the coupling end 14c of the directional coupler 14 is coupled to the first input end of the single-pole double-throw switch 15, and the isolation end 14d of the directional coupler 14 is coupled to the load R.
In addition, the isolation circuit 13 is coupled to a second input terminal of the single-pole double-throw switch 15, and an output terminal of the single-pole double-throw switch 15 is coupled to the feedback receiving terminal 11 b.
Specifically, when a signal is transmitted, the single-pole double-throw switch 15 connects the first input terminal and the output terminal, the transmission signal is output through the radio frequency output terminal 11a, when the transmission signal passes through the directional coupler 14, most of the signal is output through the output terminal 14b of the directional coupler 14 and is output to the antenna tuning circuit 12 through the isolation circuit 13, and a small part of the signal is transmitted to the feedback receiving terminal 11b through the coupling terminal 14c of the directional coupler 14 due to the coupling effect.
Specifically, when a signal is reflected, the single-pole double-throw switch 15 communicates the second input terminal and the output terminal, the reflected signal reaches the feedback receiving terminal 11b through the antenna 20, the antenna tuning circuit 12 and the isolation circuit 13, and since there is no path from the antenna tuning circuit 12 to the radio frequency output terminal 11a in the isolation circuit 13, the reflected signal cannot reach the radio frequency output terminal 11 a.
Referring to fig. 6, fig. 6 is a schematic diagram of a fourth structure of the rf feedback detection circuit according to the embodiment of the present application, where the rf feedback detection circuit 10 includes an rf circuit 11, an antenna tuning circuit 12, an isolation circuit 13, a directional coupler 14, a single-pole double-throw switch 15, a power amplification circuit 16, and a gain adjustment circuit 17.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a directional coupler according to an embodiment of the present application, in which the directional coupler 14 is composed of two closely spaced conductive lines, including a first conductive line L1 and a second conductive line L2, and further includes an input end 14a, an output end 14b, a coupling end 14c, and an isolation end 14 d.
Alternatively, the radio frequency circuit 11 may be a radio Transceiver (Transceiver) which includes a Tx port (radio frequency output 11a) and an FBRx port (feedback receiving end 11 b).
An input terminal of the power amplifier circuit 16 is coupled to the rf output terminal 11a, and an output terminal of the power amplifier circuit 16 is coupled to the input terminal 14a of the directional coupler 14.
Alternatively, the power amplifier circuit 16 may be a multi-mode multi-frequency power amplifier (MMPA), which may maintain high efficiency operation at a variety of output powers.
The output terminal 14b of the directional coupler 14 is coupled to the isolation circuit 13, the coupling terminal 14c of the directional coupler 14 is coupled to the first input terminal of the single-pole double-throw switch 15, and the isolation terminal 14d of the directional coupler 14 is coupled to the load R.
The isolation circuit 13 is coupled to an input terminal of the gain adjustment circuit 17.
Wherein, the output end of the gain adjusting circuit 17 is a second input end of the single-pole double-throw switch 15, and the output end of the single-pole double-throw switch 15 is coupled to the feedback receiving end 11 b.
Alternatively, the gain adjustment circuit 17 may be an adjustable attenuator, which is a circuit that introduces a predetermined attenuation over a specified frequency range. Generally indicated in decibels of the attenuation introduced and ohms of its characteristic impedance.
Specifically, the minimum attenuation value of the adjustable attenuator is less than or equal to 1dB, and a high dynamic reflected power detection range is realized, so that more agile antenna tuning power is realized, and better communication quality is achieved.
Wherein the antenna tuning circuit 12 is coupled to the isolation circuit 13 and the antenna 20.
Specifically, when a signal is transmitted, the single-pole double-throw switch 15 is communicated with the first input end and the output end, the transmitted signal is output through the radio frequency output end 11a and is amplified by the power amplifying circuit 16, when the transmitted signal passes through the directional coupler 14, most of the signal is output through the output end 14b of the directional coupler 14 and is output to the antenna tuning circuit 12 through the isolating circuit 13, and a small part of the signal is transmitted to the feedback receiving end 11b through the coupling end 14c of the directional coupler 14 due to the coupling effect.
For example, the coupling coefficient of the directional coupler 14 is 23dB, the output power of the power amplification circuit 16 is 23dBm, the signal emitted by the radio frequency circuit 11 is amplified by the power amplification circuit 16 and then connected to the directional coupler 14 at an Antenna Switch Module (ASM) (not shown), most of the power is transmitted to the antenna tuning circuit 12 through the isolation circuit 13, and a small part of the power (23dBm-23dB ═ 0dBm) is transmitted from the coupling end of the directional coupler 13 to the feedback receiving end 11b through the single-pole double-throw gate, so that the corresponding forward power value P _ FWD can be obtained through calculation.
Specifically, when a signal is reflected, the single-pole double-throw switch 15 communicates the second input terminal and the output terminal, the reflected signal reaches the feedback receiving terminal 11b through the antenna 20, the antenna tuning circuit 12 and the isolation circuit 13, and since there is no path from the antenna tuning circuit 12 to the radio frequency output terminal 11a in the isolation circuit 13, the reflected signal cannot reach the radio frequency output terminal 11 a.
For example, when the reflected power at the antenna end is detected, since the isolation circuit 13 has directivity, the reflected signal reflected from the antenna 20 does not reach the directional coupler 14 or even the power amplification circuit 16, but only reaches the gain adjustment circuit 17, and then reaches the feedback receiving end 11b through the single-pole double-throw switch 15, so that the corresponding reflected power value P _ REV can be obtained through calculation.
Referring to fig. 7, fig. 7 is a fifth structural schematic diagram of the rf feedback detection circuit according to the embodiment of the present application, where the rf feedback detection circuit 10 includes an rf circuit 11, an antenna tuning circuit 12, an isolation circuit 13, a directional coupler 14, a single-pole double-throw switch 15, a power amplification circuit 16, a gain adjustment circuit 17, and a processor 18.
The processor 18 is coupled to the radio frequency circuit 11, the gain adjusting circuit 17 and the antenna tuning circuit 12, and is configured to adjust the gain adjusting circuit 17 or the antenna tuning circuit 12 according to the signal power detected by the feedback receiving end 11 b.
Optionally, the signal power detected by the feedback receiving end 11b is the power of the reflected signal.
Therein, the forward power value P _ FWD and the reflected power value P _ REV may be detected by the aforementioned embodiments. The matching state of the antenna 20 can be calculated from the forward power value P _ FWD and the reflected power value P _ REV, so that the antenna tuning circuit 12 is adjusted, and thus the impedance of the antenna 20 is adjusted so that the impedance of the antenna 20 and the impedance of the front-end circuit match.
For example, the reflected signal received by the feedback receiving end 11b of the rf circuit 11 is weak and cannot be accurately detected, the processor 18 may correspondingly adjust the gain of the gain adjusting circuit 17, for example, the gain adjusting circuit 17 is an adjustable attenuator and may correspondingly decrease the attenuation coefficient thereof.
In the above embodiment, since the isolation circuit is added to the circuit, the transmission signal and the reflection signal can be isolated from each other, and the two signals do not affect each other. Further, since other power devices may be disposed between the rf circuit 11 and the isolation circuit 13, the reflected signal may also be prevented from affecting the power devices. In addition, when the power of the transmitted signal and the reflected signal is detected, the accuracy of signal power detection can be improved. Particularly, the power amplifying circuit can be protected under the condition that the antenna matching state is not good, and the high-dynamic reflected power detection range is realized by adopting the adjustable attenuator link, so that the antenna matching tuning is more agile, and better communication experience is achieved.
Referring to fig. 8, fig. 8 is a schematic structural diagram of an antenna assembly 80 provided in the present embodiment, where the antenna assembly 80 includes an rf feedback detection circuit 10 and an antenna 20.
The rf feedback detection circuit 10 may be the rf feedback detection circuit described in the above embodiments, and its structure and operation principle are similar, and are not described herein again.
Referring to fig. 9, fig. 9 is a schematic structural diagram of an electronic device according to an embodiment of the present disclosure, where the electronic device 90 includes a processor 91, an rf feedback detection circuit 10, and an antenna 20.
The rf feedback detection circuit 10 is the rf feedback detection circuit described in the above embodiments, and has similar structure and operation principle, which are not described herein again.
Alternatively, in conjunction with fig. 7, the processor 18 in the foregoing embodiment may be the same processor in the processor 91 in this embodiment.
Optionally, the number of the antennas 20 in this embodiment may be multiple, taking a mobile phone as an example, the antenna 20 may include an upper antenna, a lower antenna, and the like, and the multiple antennas may be respectively configured with one rf feedback detection circuit 10 and respectively connected to the processor 91.
It is understood that the electronic device 90 in the present embodiment may be a mobile phone, a tablet computer, a wearable device, and the like.
The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made according to the content of the present specification and the accompanying drawings, or which are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.
Claims (8)
1. A radio frequency feedback detection circuit, the radio frequency feedback detection circuit comprising:
the radio frequency circuit comprises a radio frequency output end and a feedback receiving end, wherein the radio frequency output end is used for outputting a transmitting signal, and the feedback receiving end is used for receiving a reflected signal;
the output end of the antenna tuning circuit is coupled with the antenna;
the isolation circuit is coupled with a radio frequency output end of the radio frequency circuit, an input end of the antenna tuning circuit and a feedback receiving end of the radio frequency circuit, and is used for forming a signal transmitting path from the radio frequency output end to the antenna tuning circuit and forming a signal reflecting path from the antenna tuning circuit to the feedback receiving end;
the input end of the directional coupler is coupled with the radio frequency output end, the output end of the directional coupler is coupled with the isolation circuit, and the coupling end of the directional coupler is coupled with the feedback receiving end;
a single-pole double-throw switch, a first input end of the single-pole double-throw switch is coupled with the coupling end of the directional coupler, and an output end of the single-pole double-throw switch is coupled with the feedback receiving end;
the input end of the gain adjusting circuit is coupled with the isolating circuit, and the output end of the gain adjusting circuit is coupled with the second input end of the single-pole double-throw switch;
when a signal is transmitted, the first input end is communicated with the output end of the single-pole double-throw switch, and a part of the transmission signal is input to the feedback receiving end through the coupling end of the directional coupler and the single-pole double-throw switch, so that the radio frequency circuit detects the power of the transmission signal; when a signal is reflected, the second input end is communicated with the output end of the single-pole double-throw switch, and the reflected signal is input to the feedback receiving end through the antenna, the antenna tuning circuit, the isolation circuit, the gain adjusting circuit and the single-pole double-throw switch, so that the radio frequency circuit detects the power of the reflected signal.
2. The RF feedback detection circuit of claim 1,
the isolation circuit comprises a circulator;
a first end of the circulator is coupled to the radio frequency output end, a second end of the circulator is coupled to the input end of the antenna tuning circuit, and a signal transmission path from the radio frequency output end to the antenna tuning circuit is formed;
the second end of the circulator is coupled to the input end of the antenna tuning circuit, and the third end of the circulator is coupled to the feedback receiving end to form a signal reflection path from the antenna tuning circuit to the feedback receiving end.
3. The RF feedback detection circuit of claim 1,
the radio frequency feedback detection circuit further comprises a directional coupler;
the input end of the directional coupler is coupled with the radio frequency output end, the output end of the directional coupler is coupled with the isolation circuit, and the coupling end of the directional coupler is coupled with the feedback receiving end.
4. The RF feedback detection circuit of claim 3,
the feedback receiving end includes:
the first feedback receiving end is coupled with the coupling end of the directional coupler;
and the second feedback receiving end is coupled with the isolation circuit.
5. The RF feedback detection circuit of claim 1,
the radio frequency feedback detection circuit also comprises a power amplification circuit;
the input end of the power amplifying circuit is coupled with the radio frequency output end, and the output end of the power amplifying circuit is coupled with the isolating circuit.
6. The RF feedback detection circuit of claim 5,
the radio frequency feedback detection circuit further comprises a processor;
the processor is coupled to the radio frequency circuit, the gain adjusting circuit and the antenna tuning circuit, and is configured to adjust the gain adjusting circuit or the antenna tuning circuit according to the signal power detected by the feedback receiving end.
7. An antenna assembly, characterized in that the antenna assembly comprises an antenna and a radio frequency feedback detection circuit;
wherein, the radio frequency feedback detection circuit includes:
the radio frequency circuit comprises a radio frequency output end and a feedback receiving end, wherein the radio frequency output end is used for outputting a transmitting signal, and the feedback receiving end is used for receiving a reflected signal;
an antenna tuning circuit, the output end of which is coupled with the antenna;
the isolation circuit is coupled with a radio frequency output end of the radio frequency circuit, an input end of the antenna tuning circuit and a feedback receiving end of the radio frequency circuit, and is used for forming a signal transmitting path from the radio frequency output end to the antenna tuning circuit and forming a signal reflecting path from the antenna tuning circuit to the feedback receiving end;
the input end of the directional coupler is coupled with the radio frequency output end, the output end of the directional coupler is coupled with the isolation circuit, and the coupling end of the directional coupler is coupled with the feedback receiving end;
a single-pole double-throw switch, a first input end of the single-pole double-throw switch is coupled with the coupling end of the directional coupler, and an output end of the single-pole double-throw switch is coupled with the feedback receiving end;
the input end of the gain adjusting circuit is coupled with the isolating circuit, and the output end of the gain adjusting circuit is coupled with the second input end of the single-pole double-throw switch;
when a signal is transmitted, the first input end is communicated with the output end of the single-pole double-throw switch, and a part of the transmission signal is input to the feedback receiving end through the coupling end of the directional coupler and the single-pole double-throw switch, so that the radio frequency circuit detects the power of the transmission signal; when a signal is reflected, the second input end is communicated with the output end of the single-pole double-throw switch, and the reflected signal is input to the feedback receiving end through the antenna, the antenna tuning circuit, the isolation circuit, the gain adjusting circuit and the single-pole double-throw switch, so that the radio frequency circuit detects the power of the reflected signal.
8. An electronic device, characterized in that the electronic device comprises a radio frequency feedback detection circuit according to any of claims 1-6.
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| CN201910713414.1A CN110492951B (en) | 2019-08-02 | 2019-08-02 | Radio frequency feedback detection circuit, antenna assembly and electronic equipment |
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| CN111211802B (en) * | 2020-01-13 | 2022-01-07 | Oppo广东移动通信有限公司 | Programmable attenuator coupling device, radio frequency circuit and electronic equipment |
| CN111245453A (en) * | 2020-01-16 | 2020-06-05 | 惠州Tcl移动通信有限公司 | Radio frequency structure and mobile terminal |
| CN114629523A (en) * | 2022-05-13 | 2022-06-14 | 绍兴圆方半导体有限公司 | High-integration radio frequency front-end chip and radio frequency front-end for base station |
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| CN105743519A (en) * | 2016-04-07 | 2016-07-06 | 锐迪科微电子（上海）有限公司 | Radio frequency transmitting circuit, bidirectional coupler and directional coupler |
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| CN106571850A (en) * | 2016-11-08 | 2017-04-19 | 北京澳丰源科技股份有限公司 | Bidirectional amplifier of TDD mode |
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| US10320340B1 (en) * | 2018-01-11 | 2019-06-11 | Analog Devices Global Unlimited Company | Frequency-shaped digital predistortion |
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