Radio frequency circuit and electronic equipment

Abstract

The utility model relates to a radio frequency circuit and electronic equipment, and relates to the technical field of communication, and the radio frequency circuit comprises a radio frequency transmission channel, a radio frequency signal coupling circuit, and a feedback signal receiving circuit. The feedback signal receiving circuit comprising the emitting diode and the receiving diode is arranged, a photoelectric conversion mode is adopted, power feedback signals are transmitted in the space in an optical signal mode, the PCB wiring area is saved, meanwhile, due to the fact that the optical signals are not transmitted through PCB signal wiring, the power feedback signals are not interfered by PCB-level signals, and the reliability of the power feedback signals is improved. And the power feedback control precision is improved.

Description

Technical Field

[0001] The present disclosure relates to the field of communication technology, and in particular to a radio frequency circuit and electronic equipment. Background Art

[0002] The function of the coupler is to transfer the RF signal from one circuit to another while maintaining the signal amplitude characteristics, realizing closed-loop control of the RF signal feedback, which is of great significance to the power control accuracy and system stability of mobile phones.

[0003] In the existing technology, two methods are usually used to build the power feedback circuit of the RF signal. One is to use a coupler chip. With the increasing number of 5G frequency bands and the increase in mobile phone functions, the PCB (printed circuit board) wiring space becomes smaller. The coupler output signal is transmitted to the RF transceiver chip through the signal line on the PCB, which requires PCB wiring area. The RF signal is a high-frequency sensitive signal. The coupled signal is only the coupled component of the RF signal and is easily interfered with by other strong signals. Because it carries the transmitted signal component, it often interferes with the received signal in the circuit system, resulting in poor receiver signal quality. The other is to use a PCB microstrip line coupler for construction. Compared with the coupler chip, it has lower cost, but the microstrip line coupling circuit occupies a larger PCB area. In addition, the use of PCB routing to transmit the feedback signal also has the problem of signal interference or interference with the receiver system.

[0004] Therefore, how to reduce feedback signal interference and reduce the wiring area of ​​the feedback circuit on the PCB has become a technical problem that needs to be solved urgently by those skilled in the art. Utility Model Content

[0005] In order to solve the above technical problems, the present disclosure provides a radio frequency circuit and an electronic device, which are used to improve the anti-interference capability of the radio frequency circuit and save PCB wiring area.

[0006] In a first aspect, the present disclosure provides a radio frequency circuit, comprising: a radio frequency transmission channel, a radio frequency signal coupling circuit, and a feedback signal receiving circuit;

[0007] The radio frequency transmission channel includes a power amplifier, a first end of the power amplifier is connected to the radio frequency chip, and a second end of the power amplifier is connected to the antenna input interface;

[0008] The first end of the RF signal coupling circuit is connected to the antenna input interface, the second end of the RF signal coupling circuit is connected to the first end of the feedback signal receiving circuit, and the second end of the feedback signal receiving circuit is connected to the RF chip;

[0009] The feedback signal receiving circuit includes an optical signal transmission module, which is used to transmit the signal obtained by the radio frequency signal coupling circuit in the form of an optical signal.

[0010] Optionally, the optical signal transmission module includes a transmitting diode, a receiving diode, and a sampling circuit. The second end of the RF signal coupling circuit is connected to the transmitting diode through a signal line, the receiving diode is connected to the sampling circuit through a signal line, and the sampling circuit is connected to the RF chip through a signal line.

[0011] Optionally, there is no obstruction between the transmitting diode and the receiving diode.

[0012] Optionally, the radio frequency signal coupling circuit includes a Hall element.

[0013] Optionally, the Hall element is connected to the transmitting diode in the feedback signal receiving circuit through a signal line.

[0014] Optionally, the radio frequency circuit is located on a printed circuit board, the printed circuit board includes a radio frequency shielding cover, the radio frequency circuit is located in a cavity of the radio frequency shielding cover, and the cavity of the radio frequency shielding cover is a dark environment without light.

[0015] Optionally, the radio frequency circuit includes multiple radio frequency transmission channels and multiple radio frequency signal coupling circuits, and the multiple radio frequency transmission channels correspond one to one to the multiple radio frequency signal coupling circuits.

[0016] Optionally, the multiple radio frequency signal coupling circuits are connected to one feedback signal receiving circuit.

[0017] In a second aspect, the present disclosure provides an electronic device comprising the radio frequency circuit as described in the first aspect.

[0018] The technical solution provided by the embodiments of the present disclosure has the following advantages over the existing technology: based on the Hall effect, the power feedback signal is transmitted in space in the form of an optical signal through electromagnetic conversion and photoelectric conversion, saving PCB wiring area; the power feedback signal is not subject to interference from PCB board-level signals, thereby improving the accuracy of power feedback control and reducing the impact of leakage radiation of the power feedback signal on receiver performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0020] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0021] Figure 1 FIG2 is a schematic diagram of a radio frequency circuit connection provided by an embodiment of the present disclosure;

[0022] Figure 2 FIG2 is a schematic diagram of a feedback signal receiving circuit provided by an embodiment of the present disclosure;

[0023] Figure 3 Shown is a schematic diagram of a radio frequency circuit connection provided by an embodiment of the present disclosure. DETAILED DESCRIPTION

[0024] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features therein can be combined with each other in the absence of conflict.

[0025] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0026] Figure 1 FIG. 1 is a schematic diagram of a radio frequency circuit connection provided by an embodiment of the present disclosure. Figure 2 The figure shows a schematic diagram of a feedback signal receiving circuit provided by an embodiment of the present disclosure. Please refer to Figure 1 and Figure 2 , the present disclosure provides a radio frequency circuit 00, comprising: a radio frequency transmission channel 10, a radio frequency signal coupling circuit 20, and a feedback signal receiving circuit 30;

[0027] The RF transmission channel 10 includes a power amplifier 11. A first end of the power amplifier 11 is connected to the RF chip 01. A second end of the power amplifier 11 is connected to an antenna input interface 12. The antenna input interface 12 is connected to an external antenna 13.

[0028] A first end of the RF signal coupling circuit 20 is connected to the antenna input interface 12, a second end of the RF signal coupling circuit 20 is connected to a first end of the feedback signal receiving circuit 30, and a second end of the feedback signal receiving circuit 30 is connected to the RF chip 01;

[0029] The feedback signal receiving circuit 30 includes an optical signal transmission module for transmitting the signal obtained by the RF signal coupling circuit 20 as an optical signal. In an optional embodiment provided by the present disclosure, the optical signal transmission module includes an emitting diode 31, a receiving diode 32, and a sampling circuit 33. The second end of the RF signal coupling circuit 20 is connected to the emitting diode 31 via a signal trace, the receiving diode 32 is connected to the sampling circuit 33 via a signal trace, and the sampling circuit 33 is connected to the RF chip 01 via a signal trace. The sampling circuit can adopt the structure of a sampling circuit in the prior art, for example, including a comparator.

[0030] Specifically, the RF circuit 00 includes an RF transmission channel 10, which includes a power amplifier 11. The first end of the power amplifier 11 is connected to the RF chip 01, and the second end of the power amplifier 11 is connected to the antenna input interface 12. The RF chip 01 sends a RF signal, which is input to the first end of the power amplifier 11. The RF signal amplified by the power amplifier 11 enters the antenna input interface 12 from the second end of the power amplifier 11; the first end of the RF signal coupling circuit 20 is connected to the antenna input interface 12, and the signal input by the RF signal coupling circuit 20 is the RF signal amplified by the power amplifier 11. The RF signal enters the RF signal coupling circuit 20 through the signal line on the PCB, and the second end of the RF signal coupling circuit 20 is connected to the first end of the feedback signal receiving circuit 30. The output signal of the RF signal coupling circuit 20 enters the first end of the feedback signal receiving circuit 30 from the second end of the RF signal coupling circuit 20, and the second end of the feedback signal receiving circuit 30 is connected to the RF chip 01. The power feedback signal output by the feedback signal receiving circuit 30 is input to the RF chip 01 from the second end of the feedback signal receiving circuit 30.

[0031] The feedback signal receiving circuit 30 includes an emitting diode 31. The second end of the RF signal coupling circuit 20 is connected to the emitting diode 31 through a signal trace on the PCB. The output signal of the RF signal coupling circuit 20 serves as the power supply for the emitting diode 31, driving the emitting diode 31 to emit light. The brightness of the emitting diode 31 changes with the size of the output signal. The feedback signal receiving circuit 30 includes a receiving diode 32. The receiving diode 32 can receive the optical signal emitted by the emitting diode 31 and convert the received optical signal into an electrical signal. The feedback signal receiving circuit 30 also includes a sampling circuit 33. The receiving diode 32 is connected to the sampling circuit 33 through a signal trace on the PCB. The sampling circuit 33 is connected to the RF chip 01 through a signal trace. After the receiving diode 32 converts the optical signal into an electrical signal, the generated weak electrical signal is amplified by the sampling circuit 33. The amplified electrical signal is transmitted to the RF chip 01 as a power feedback signal. The RF chip 01 determines the output signal size based on the size of the power feedback signal, thereby dynamically adjusting the output power size to achieve precise power feedback control.

[0032] In an optional embodiment provided by the present disclosure, the receiving diode 32 can be composed of a photodiode, which is a semiconductor device that uses the photoelectric effect to convert light energy into electrical energy. When light is irradiated on the PN junction of the photodiode, photons are absorbed and stimulate electron-hole pairs. These electron-hole pairs are separated under the action of the electric field of the PN junction to form a photocurrent, and the magnitude of the photocurrent is proportional to the intensity of the incident light.

[0033] In this way, by providing a feedback signal receiving circuit 30 having a transmitting diode 31 and a receiving diode 32, the power feedback signal is transmitted in space in the form of an optical signal using a photoelectric conversion method, thereby saving PCB wiring area. At the same time, since the optical signal is not transmitted using PCB signal routing, the power feedback signal is not subject to interference from PCB board-level signals, thereby improving the accuracy of power feedback control and preventing the receiver performance from being affected by power signal leakage radiation.

[0034] Please refer to Figure 1 and Figure 2 In an optional embodiment provided by the present disclosure, there is no obstruction between the transmitting diode 31 and the receiving diode 32.

[0035] Specifically, the emitting diode 31 is bound to the surface of the PCB, and the receiving diode 32 is placed on the surface of the PCB. The receiving diode 32 corresponds to the emitting diode 31 in spatial position. The receiving diode 32 includes a probe. The probe of the receiving diode 32 faces the side of the emitting diode 31. The emitting diode 31 emits an optical signal, and the receiving diode 32 receives the optical signal emitted by the emitting diode 31. The space between the two is unobstructed, which is conducive to the receiving diode 32 directly receiving the optical signal and improving the transmission effect of the optical signal.

[0036] Please continue to refer to Figure 1 and Figure 2 In an optional embodiment provided by the present disclosure, the RF signal coupling circuit 20 includes a Hall element 21 .

[0037] Specifically, the RF signal coupling circuit 20 includes a Hall element 21, which can generate a Hall effect. The Hall effect can detect changes in the magnetic field and convert them into electrical signals for output, and has the characteristics of high precision, low power consumption, and easy integration. The RF signal coupling circuit 20, which uses a magnetic field as a working medium and is based on the Hall effect, can convert the amplified RF signal input to the first end of the RF signal coupling circuit 20 into an electrical signal, which is output from the second end of the RF signal coupling circuit 20 to the first end of the feedback signal receiving circuit 30, serving as the power supply for the transmitting diode 31 in the feedback signal receiving circuit 30. In this way, by providing the Hall element 21 in the RF signal coupling circuit 20, the RF signal power coupling signal can be converted into an electrical signal, which serves as the power supply for the transmitting diode 31, facilitating subsequent signal transmission processing via an optical medium, ensuring that the coupled signal transmission process is not interfered with by PCB board-level signals, and reducing the interference of the power feedback signal on the receiver signal.

[0038] Please continue to refer to Figure 1 and Figure 2 In an optional embodiment provided by the present disclosure, the Hall element is connected to the emitting diode 31 in the feedback signal receiving circuit 30 through a signal trace.

[0039] Specifically, the signal input at the first end of the RF signal coupling circuit 20 is the RF signal amplified by the power amplifier 11. The RF signal is connected to the Hall element 21 in the RF signal coupling circuit 20 through a PCB line. The Hall element 21 generates an electrical signal based on the Hall effect. The electrical signal is connected to the emitting diode 31 in the feedback signal receiving circuit 30 through a PCB trace, serving as the power supply for the diode. The RF signal power is different. Based on the Hall effect, the voltage of the electrical signal generated by the Hall element 21 is different. The voltage of the electrical signal serves as the power supply for the emitting diode 31 to drive the emitting diode 31 to emit light. The voltage generated by the Hall element 21 is different under different RF signal power levels, driving the emitting diode 31 to emit light at different brightness. In this way, the electrical signal generated by the Hall element 21 serves as the power supply for the emitting diode 31. Based on the Hall effect, through electromagnetic conversion and photoelectric conversion, it is beneficial to transmit the power feedback signal in the form of an optical signal in space, saving PCB wiring area.

[0040] In an optional embodiment provided by the present disclosure, the radio frequency circuit 00 is located on a printed circuit board, the printed circuit board includes a radio frequency shielding cover (not shown in the figure), and the radio frequency circuit 00 is located in the radio frequency shielding cover cavity. Figure 1 The RF chip 01, RF transmission channel 10, RF signal coupling circuit 20, and feedback signal receiving circuit 30 are all located inside the RF shielding cavity, the antenna input interface 12 and the external antenna 13 are located outside the RF shielding cavity, and the RF shielding cavity is a dark environment without light.

[0041] Specifically, the RF circuit 00 is located on a printed circuit board, that is, various components in the RF circuit 00, such as the power amplifier 11, the Hall element 21, the transmitting diode 31, the receiving diode 32, the sampling circuit 33, etc. are all located on the PCB board, and various components are connected through signal traces. The printed circuit board includes a RF shielding cover, which can be a three-dimensional cover with an opening on one side. The cover body can be a cube, a rectangular parallelepiped, a hemisphere, etc., which are not listed here one by one. The RF circuit 00 is located in the RF shielding cover cavity, and the RF shielding cover cavity is a light-free and dark environment. In this way, by setting a RF shielding cover on the RF circuit 00, the components in the RF circuit 00 can be dust-proof and shielded. Based on the light-free and dark environment in the RF shielding cover cavity, the impact on the optical signal transmission between the transmitting diode 31 and the receiving diode 32 is reduced, thereby improving the optical signal transmission effect.

[0042] Figure 3 The figure shows a schematic diagram of a radio frequency circuit connection provided by an embodiment of the present disclosure. Figures 1 to 3In an optional embodiment provided by the present disclosure, the RF circuit 00 includes multiple RF transmission channels 10 and multiple RF signal coupling circuits 20, and the multiple RF transmission channels 10 correspond one to one to the multiple RF signal coupling circuits 20.

[0043] Specifically, in an optional embodiment provided by the present disclosure, the RF circuit 00 may simultaneously include multiple RF transmission channels 10, each RF transmission channel 10 includes a power amplifier 11, and the RF circuit 00 may also simultaneously include multiple RF signal coupling circuits 20, each RF signal coupling circuit 20 includes a Hall element 21, and multiple RF transmission channels 10 correspond one-to-one to multiple RF signal coupling circuits 20, that is, the power amplifiers 11 in the multiple RF transmission channels 10 correspond one-to-one to the Hall elements 21 in the multiple RF signal coupling circuits 20, for the specific power that the same power amplifier 11 only transmits a specific frequency at the same time, multiple RF transmission channels 10 can transmit multiple specific frequency powers at the same time, and accordingly, multiple RF signal coupling circuits 20 can receive multiple specific frequency powers at the same time. In this way, by establishing multiple RF transmission channels 10 and multiple RF signal coupling circuits 20, it is beneficial to subsequently feedback multiple frequency powers at the same time, thereby improving the feedback efficiency of the power feedback signal.

[0044] It should be noted that Figure 3 The number of RF transmission channels 10 and RF signal coupling circuits 20 is for illustration only and does not represent the number of channels in the actual RF circuit 00. For example, the number of RF transmission channels 10 and RF signal coupling circuits 20 in the RF circuit 00 can be 4, 5, 6... and so on. They are not listed here one by one, and the specific number shall be subject to actual needs.

[0045] Please combine Figures 1 to 3 In an optional embodiment provided by the present disclosure, multiple RF signal coupling circuits 20 are connected to one feedback signal receiving circuit 30 .

[0046] Specifically, in an optional embodiment provided by the present disclosure, the RF circuit 00 includes multiple RF transmission channels 10, and the RF circuit 00 includes multiple RF signal coupling circuits 20. The multiple RF transmission channels 10 correspond to the multiple RF signal coupling circuits 20 one by one. The multiple RF transmission channels 10 can transmit multiple specific frequency powers at the same time, and the multiple RF signal coupling circuits 20 can receive multiple specific frequency powers at the same time. The multiple RF signal coupling circuits 20 share a feedback signal receiving circuit 30, that is, the multiple Hall elements 21 in the multiple RF signal coupling circuits 20 are connected to one of the Hall elements 21 in the feedback signal receiving circuit 30. Corresponding to the emitting diode 31, since the frequency of the optical signal is not limited, when there are power feedback signals working simultaneously in multiple transmitting signal coupling channels, the power feedback signals of multiple frequencies are converted into electrical signals of different voltages through the one-to-one corresponding Hall elements 21. The emitting diode 31 emits optical signals of different bands according to different electrical signals, and the receiving diode 32 receives the optical signals of different bands emitted by the emitting diode 31. Based on the characteristic band optical signal identification, multiple power feedback signals can be simultaneously identified. In this way, by sharing one feedback signal receiving circuit 30 through multiple RF signal coupling circuits 20, the PCB wiring area can be further reduced.

[0047] The present disclosure provides an electronic device, including a radio frequency circuit 00 as described in any of the aforementioned embodiments. It should be noted that the radio frequency circuit 00 may also include electronic components such as an antenna tuner, a low noise amplifier, a mixer, and a filter, which are not listed here one by one.

[0048] It can be understood that the electronic device provided in the embodiments of the present disclosure may be a mobile phone, a tablet computer, a wearable device, etc.

[0049] In summary, the present disclosure provides a radio frequency circuit and electronic equipment, which, by setting a feedback signal receiving circuit including a transmitting diode and a receiving diode, adopts a photoelectric conversion method to transmit the power feedback signal in space in the form of an optical signal, thereby saving PCB wiring area. At the same time, since the optical signal is not transmitted through the PCB signal trace, the power feedback signal is not interfered with by the PCB board-level signal, thereby improving the power feedback control accuracy; the receiving diode and the transmitting diode correspond in spatial position, and the space between the two is unobstructed, which is conducive to the receiving diode directly receiving the optical signal and improving the transmission effect of the optical signal; by setting a Hall element in the radio frequency signal coupling circuit, the radio frequency signal power coupling signal can be converted into an electrical signal as the power supply for the transmitting diode, which is beneficial to the subsequent Signal transmission and processing are carried out through optical media; the Hall element is conducive to transmitting the power feedback signal in the form of an optical signal in space through electromagnetic conversion and photoelectric conversion, saving PCB wiring area; by setting an RF shielding cover on the RF circuit, it can provide dust shielding for the components in the RF circuit, and based on the dark and dark environment in the RF shielding cover cavity, it reduces the impact on the optical signal transmission between the transmitting diode and the receiving diode, thereby improving the optical signal transmission effect; by establishing multiple RF transmission channels and multiple RF signal coupling circuits, it is conducive to the subsequent feedback of multiple frequency powers at the same time, thereby improving the feedback efficiency of the power feedback signal; by having multiple RF signal coupling circuits share a feedback signal receiving circuit, the PCB wiring area occupied can be further reduced.

[0050] The foregoing description is intended only to provide specific embodiments of the present disclosure, intended to enable those skilled in the art to understand and implement the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure is not intended to be limited to the embodiments described herein, but rather to be construed in the broadest manner consistent with the principles and novel features disclosed herein.

Claims

1. A radio frequency circuit, characterized in that: include: RF transmission channel, RF signal coupling circuit, feedback signal receiving circuit; The radio frequency transmission channel includes a power amplifier, a first end of the power amplifier is connected to the radio frequency chip, and a second end of the power amplifier is connected to the antenna input interface; The first end of the RF signal coupling circuit is connected to the antenna input interface, the second end of the RF signal coupling circuit is connected to the first end of the feedback signal receiving circuit, and the second end of the feedback signal receiving circuit is connected to the RF chip; The feedback signal receiving circuit includes an optical signal transmission module, which is used to transmit the signal obtained by the radio frequency signal coupling circuit in the form of an optical signal.

2. The radio frequency circuit according to claim 1, wherein: The optical signal transmission module includes a transmitting diode, a receiving diode, and a sampling circuit. The second end of the RF signal coupling circuit is connected to the transmitting diode through a signal line, the receiving diode is connected to the sampling circuit through a signal line, and the sampling circuit is connected to the RF chip through a signal line.

3. The radio frequency circuit according to claim 2, wherein: There is no obstruction between the transmitting diode and the receiving diode.

4. The radio frequency circuit according to claim 1, wherein: The radio frequency signal coupling circuit includes a Hall element.

5. The radio frequency circuit according to claim 4, wherein: The Hall element is connected to the emitting diode in the feedback signal receiving circuit through a signal line.

6. The radio frequency circuit according to claim 1, wherein: The radio frequency circuit is located on a printed circuit board, the printed circuit board includes a radio frequency shielding cover, the radio frequency circuit is located in a radio frequency shielding cover cavity, and the radio frequency shielding cover cavity is a dark environment without light.

7. The radio frequency circuit according to claim 1, wherein: The radio frequency circuit includes a plurality of radio frequency transmission channels and a plurality of radio frequency signal coupling circuits, and the plurality of radio frequency transmission channels correspond one to one to the plurality of radio frequency signal coupling circuits.

8. The radio frequency circuit according to claim 7, wherein: The multiple radio frequency signal coupling circuits are connected to one feedback signal receiving circuit.

9. An electronic device, characterized in that: The method comprises the radio frequency circuit according to any one of claims 1 to 8.

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