Radio frequency front-end chip, radio frequency front-end circuit and electronic device

Abstract

The present application relates to the field of radio frequency and is used for implementing a radio frequency front end integrating multiple satellite communication modes. Disclosed are a radio frequency front-end chip, a radio frequency front-end circuit and an electronic device. In the radio frequency front-end chip, a plurality of input pins are respectively and electrically connected to a plurality of gating ends of a switch; a control end of the switch is electrically connected to a control circuit; the control circuit is electrically connected to a control pin, a third power supply pin and a bias circuit, the bias circuit being electrically connected to a PA, and the PA being electrically connected to a first power supply pin and a second power supply pin; a common end of the switch is electrically connected to a first end of a first capacitor; a second end of the first capacitor is electrically connected to an input end of the PA; an output end of the PA is electrically connected to an input end of a coupler; a through port of the coupler is electrically connected to a first end of a second capacitor, and a coupled port of the coupler is electrically connected to a coupling output pin and a detection pin; a second end of the second capacitor is electrically connected to an antenna pin.

Description

Radio frequency front-end chip, radio frequency front-end circuit and electronic device

[0001] The present application claims priority from the Chinese patent application No. 202422200742.0 filed on September 6, 2024, and entitled "Radio frequency front-end chip, radio frequency front-end circuit and electronic device", the whole content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the field of radio frequency, in particular to a radio frequency front-end chip, a radio frequency front-end circuit and an electronic device. BACKGROUND

[0003] More and more miniaturized electronic devices (such as mobile phones) support multiple satellite communication modes, such as Beidou satellite communication, Tianhong satellite communication, Xingwang satellite communication, etc. Various satellite communication modes have independent baseband chips, radio frequency integrated circuits (RFICs) and radio frequency front-end chips, and in particular, the radio frequency front-end chips of multiple satellite communication modes occupy too large an area of the circuit board, which is not conducive to the miniaturization of the electronic device.

[0004] Practical new type content

[0005] Embodiments of the present application provide a radio frequency front-end chip, a radio frequency front-end circuit and an electronic device, which are used to realize a radio frequency front-end chip integrated with multiple satellite communication modes, so as to facilitate the miniaturization of the electronic device.

[0006] To achieve the above-mentioned purpose, embodiments of the present application adopt the following technical solutions:

[0007] In a first aspect, a radio frequency front-end chip is provided, comprising: a power amplifier (PA), a coupler, a switch, a control circuit, a bias circuit, a first capacitor, a second capacitor, a plurality of input pins, a control pin, a first power supply pin, a second power supply pin, a third power supply pin, an antenna pin, a coupling output pin, a detection pin, and a ground pin; the plurality of input pins are electrically connected to a plurality of gating terminals of the switch, respectively; a control terminal of the switch is electrically connected to the control circuit, the control circuit is electrically connected to the control pin, the third power supply pin, and the bias circuit, the bias circuit is electrically connected to the PA, and the PA is electrically connected to the first power supply pin and the second power supply pin; a common terminal of the switch is electrically connected to a first terminal of the first capacitor, a second terminal of the first capacitor is electrically connected to an input terminal of the PA, an output terminal of the PA is electrically connected to an input terminal of the coupler, a through terminal of the coupler is electrically connected to a first terminal of the second capacitor, and a coupling terminal of the coupler is electrically connected to the coupling output pin and the detection pin; a second terminal of the second capacitor is electrically connected to the antenna pin; the plurality of input pins are configured to input radio frequency signals of different satellite communication modes; the control pin is configured to control the switch to turn on one of the plurality of gating terminals and the common terminal by the control circuit, and control the bias circuit to output a bias voltage to the PA; the coupling output pin is configured to output coupled radio frequency signals; the detection pin is configured to output a direct current signal indicating a power of the PA; the antenna pin is configured to be electrically connected to an antenna; the first power supply pin is configured to supply power to a driving stage of the PA; the second power supply pin is configured to supply power to a last stage of the PA; the third power supply pin is configured to supply power to the control circuit and provide a bias voltage and a bias current to the PA through the bias circuit; and the ground pin is configured to be grounded.

[0008] In the radio frequency front-end chip, the plurality of gating terminals of the switch are electrically connected to the plurality of input pins, respectively, and each input pin can input radio frequency signals of one satellite communication mode. The common terminal of the switch is electrically connected to the input terminal of the PA, and the switch is controlled by a control signal input by the control pin to select one of the plurality of gating terminals to be turned on with the common terminal, so as to select one of the plurality of input pins to be turned on with the input terminal of the PA. Thus, the radio frequency front-end chip integrating multiple satellite communication modes is realized, which facilitates miniaturization of electronic devices.

[0009] In a possible implementation, the plurality of input pins include a first input pin, a second input pin, and a third input pin, and the plurality of gating terminals of the switch include a first gating terminal, a second gating terminal, and a third gating terminal. The first input pin is electrically connected to the first gating terminal of the switch, the second input pin is electrically connected to the second gating terminal of the switch, and the third input pin is electrically connected to the third gating terminal of the switch. The plurality of input pins can further include more (for example, four) or fewer (for example, two) input pins to adapt to input radio frequency signals of different satellite communication modes.

[0010] In a possible implementation, the control pins include a first control pin and a second control pin, and the first control pin and the second control pin are configured to control, by the control circuit, the switch to turn on one of the first gating terminal, the second gating terminal, and the third gating terminal and the common terminal. The number of the input pins is the same as the number of the gating terminals of the switch. As the number of the input pins increases, the number of the gating terminals of the switch increases, and the number of the control pins can also increase accordingly. For example, one control pin can control at least two gating terminals (and at least two input pins) to be turned on with the common terminal, two control pins can control at least four gating terminals (and at least four input pins) to be turned on with the common terminal, and so on. K control pins can control at least 2^K gating terminals (and at least 2^K input pins) to be turned on with the common terminal. The plurality of input pins are located on the same side, and the control pins are located on the same side, which facilitates the wiring of the radio frequency front-end chip.

[0011] In a possible implementation, the package of the radio frequency front-end chip is a quadrilateral, and the plurality of input pins are located on a first side of the quadrilateral. The antenna pin and the coupling output pin are located on a third side of the quadrilateral. The first side is opposite to the third side. The plurality of input pins are located on the same side, which facilitates the wiring of the radio frequency front-end chip. The plurality of input pins are configured to input radio frequency signals, and the antenna pin and the coupling output pin are configured to output radio frequency signals. Therefore, the first side on which the plurality of input pins are located is opposite to the third side on which the antenna pin and the coupling output pin are located, to avoid mutual interference caused by coupling.

[0012] In a possible implementation, the control pin, the detection pin, and the third power supply pin are located on a fourth side of the quadrilateral. The control pin and the detection pin are both direct current signals, and are located on the same side and are not located on the same side as the radio frequency signals, to avoid interference from the radio frequency signals. The third power supply pin and the control pin are both electrically connected to the control circuit, and therefore the third power supply pin and the control pin are also located on the same side, to shorten the internal wiring distance.

[0013] In a possible implementation, the first power supply pin and the second power supply pin are located on a second side of the quadrilateral. The first power supply pin and the second power supply pin are both configured to supply power to the PA, and therefore the first power supply pin and the second power supply pin are also located on the same side, to shorten the internal wiring distance.

[0014] In a possible implementation, the remaining pins of the radio frequency front-end chip are all ground pins, and the plurality of ground pins are distributed in the center and the four corners of the radio frequency front-end chip, to achieve good grounding of the radio frequency front-end chip and reduce interference of external signals on the internal part of the radio frequency front-end chip.

[0015] In one possible implementation, the package size of the RF front-end chip is 3.5mm*3.5mm. This is smaller than the sizes of the RF front-end chips for Tiantong and Beidou in the prior art (5mm*5mm and 5mm*4mm respectively), saving the area of ​​at least one RF front-end chip when supporting multiple satellite communication methods, and making it easier to lay out on the circuit board.

[0016] In a second aspect, a radio frequency (RF) front-end circuit is provided, comprising an RF front-end chip as described in the first aspect and any embodiment thereof, a harmonic suppression network, a first switch, a first low noise amplifier (LNA), a first filter, and a second filter. The first terminal of the first filter is an input terminal for an RF signal; the second terminal of the first filter is electrically connected to a first input pin of the RF front-end chip; the first and second control pins of the RF front-end chip are electrically connected to a baseband chip; the first, second, and third power supply pins of the RF front-end chip are electrically connected to a power supply; the coupling output pin and detection pin of the RF front-end chip are electrically connected to the baseband chip; and the antenna pin of the RF front-end chip is electrically connected to the first terminal of the harmonic suppression network. The second terminal of the harmonic suppression network is electrically connected to a first selection terminal of the first switch; the first common terminal of the first switch is electrically connected to the antenna; the second selection terminal of the first switch is electrically connected to the input terminal of the first LNA; the output terminal of the first LNA is electrically connected to the second terminal of the second filter; and the first terminal of the second filter is an output terminal for an RF signal. This RF front-end circuit supports either Tiantong satellite communication or Xingwang satellite communication.

[0017] In one possible implementation, a third filter is also included, with the second selection terminal of the first switch electrically connected to the input terminal of the first LNA via the third filter. This RF front-end circuit supports BeiDou satellite communication. The downlink signal-to-noise ratio of BeiDou satellite communication is sufficiently high. Although adding a third filter to the input terminal of the first LNA increases insertion loss, it can filter out out-of-band noise signals, thereby improving the sensitivity of the first LNA.

[0018] In one possible implementation, the system further includes a second switch, a fourth filter, and a fifth filter. The first terminal of the fourth filter is the input terminal for the radio frequency (RF) signal. The second terminal of the fourth filter is electrically connected to the second input pin of the RF front-end chip. The output terminal of the first LNA is electrically connected to the common terminal of the second switch. The first select terminal of the second switch is electrically connected to the second terminal of the second filter. The second select terminal of the second switch is electrically connected to the second terminal of the fifth filter. The first terminal of the fifth filter is the output terminal for the RF signal. This RF front-end circuit supports both Tiantong satellite communication and Xingwang satellite communication.

[0019] In a possible implementation, the second switch, the fourth filter, the sixth filter, the seventh filter, and the second LNA are further included, the first end of the fourth filter is an input end of the radio frequency signal, the second end of the fourth filter is electrically connected with a second input pin of the radio frequency front-end chip, the third gating end of the first switch is electrically connected with the input end of the first LNA through the sixth filter, the output end of the first LNA is electrically connected with the second end of the seventh filter, and the first end of the seventh filter is an output end of the radio frequency signal. The radio frequency front-end circuit supports two satellite communication modes of the Tianxiang satellite communication and the Beidou satellite communication, or supports two satellite communication modes of the Xingwang satellite communication and the Beidou satellite communication.

[0020] In a possible implementation, the eighth filter is further included, the first end of the eighth filter is an input end of the radio frequency signal, and the second end of the eighth filter is electrically connected with a third input pin of the radio frequency front-end chip.

[0021] In a possible implementation, the third switch is further included, the first common end of the first switch is electrically connected with a common end of the third switch, the first gating end of the third switch is electrically connected with the first antenna, and the second gating end of the third switch is electrically connected with the second antenna. The radio frequency front-end circuit can be electrically connected with the dual antennas.

[0022] In a possible implementation, the first common end of the first switch is electrically connected with the first antenna, and the second common end of the first switch is electrically connected with the second antenna. The radio frequency front-end circuit can be electrically connected with the dual antennas.

[0023] In a possible implementation, the harmonic suppression network includes: a first inductor, a second inductor, a first capacitor, a third capacitor, and a fourth capacitor; the first end of the first inductor is a first end of the harmonic suppression network, the second end of the first inductor, the first end of the first capacitor, the first end of the second inductor, and the first end of the third capacitor are electrically connected, and the second end of the first capacitor is grounded; the second end of the second inductor is a second end of the harmonic suppression network and is electrically connected with the second end of the fourth capacitor; and the second end of the third capacitor is electrically connected with the first end of the fourth capacitor. Since the satellite communication has high transmission power and large harmonic energy, a corresponding harmonic suppression network needs to be designed according to different satellite communications to suppress the out-of-band spurious signals, which is different from the cellular communication. Although the PA in the radio frequency front-end chip can preliminarily suppress the harmonics of the radio frequency signal, the effect is limited, and the harmonic suppression network needs to provide additional harmonic suppression. The harmonic suppression network can be applied to the radio frequency front-end circuit supporting the Xingwang satellite communication or the Tianxiang satellite communication.

[0024] In a possible implementation, the harmonic suppression network further includes: a third inductor, a fourth inductor, and a second capacitor; a first end of the first inductor is electrically connected with a first end of the third inductor and a first end of the second capacitor, a second end of the second capacitor is electrically connected with a first end of the fourth inductor, and a second end of the third inductor and a second end of the fourth inductor are grounded. The harmonic suppression network can be applied to a radio frequency front-end circuit supporting Beidou satellite communication, or can be applied to a radio frequency front-end circuit supporting Beidou satellite communication and satellite network satellite communication.

[0025] In a possible implementation, the harmonic suppression network further includes: a fifth capacitor, a sixth capacitor, and a seventh capacitor; a first end of the third capacitor is electrically connected with a first end of the fifth capacitor, a second end of the fifth capacitor, a first end of the sixth capacitor, and a first end of the seventh capacitor are electrically connected, a second end of the seventh capacitor is grounded, and a second end of the sixth capacitor is electrically connected with a second end of the fourth capacitor. The harmonic suppression network can be applied to a radio frequency front-end circuit supporting three satellite communication modes.

[0026] In a possible implementation, the harmonic suppression network further includes: a fifth inductor, a sixth inductor, and a seventh capacitor; a first end of the second inductor is electrically connected with a first end of the fifth inductor, a second end of the second inductor is electrically connected with a second end of the sixth inductor, a second end of the seventh capacitor is grounded, and a second end of the sixth inductor is electrically connected with a second end of the fourth capacitor. The harmonic suppression network can be applied to a radio frequency front-end circuit supporting satellite network satellite communication and Tianhong satellite communication.

[0027] In a third aspect, an electronic device is provided, including a baseband chip, a radio frequency integrated circuit, an antenna, and a radio frequency front-end circuit as described in the second aspect and any one of the implementations thereof, the baseband chip is electrically connected with the radio frequency integrated circuit and the radio frequency front-end circuit, the radio frequency integrated circuit is electrically connected with the radio frequency front-end circuit, and the radio frequency integrated circuit is electrically connected with the antenna.

[0028] The technical effects of the third aspect are referred to the technical effects of the first aspect to the second aspect and any one of the implementations thereof, which are not repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0029] FIG. 1 is a schematic diagram of an appearance of an electronic device according to an embodiment of the present application;

[0030] FIG. 2 is a schematic diagram of a structure of an electronic device according to an embodiment of the present application;

[0031] FIG. 3 is a schematic diagram of a structure of a radio frequency front-end circuit according to an embodiment of the present application;

[0032] FIG. 4 is a schematic diagram of a structure of a radio frequency front-end circuit according to an embodiment of the present application;

[0033] FIG. 5 is a structural schematic diagram of a radio frequency front-end chip according to an embodiment of the present application;

[0034] FIG. 6 is a packaging schematic diagram of a radio frequency front-end chip according to an embodiment of the present application;

[0035] FIG. 7 is a structural schematic diagram of a radio frequency front-end circuit according to an embodiment of the present application;

[0036] FIG. 8 is a schematic diagram of a radio frequency signal flow direction according to an embodiment of the present application;

[0037] FIG. 9 is a schematic diagram of a radio frequency signal flow direction according to an embodiment of the present application;

[0038] FIG. 10 is a schematic diagram of a radio frequency signal flow direction according to an embodiment of the present application;

[0039] FIG. 11 is a structural schematic diagram of a radio frequency front-end circuit according to an embodiment of the present application;

[0040] FIG. 12 is a structural schematic diagram of a radio frequency front-end circuit according to an embodiment of the present application;

[0041] FIG. 13 is a structural schematic diagram of a radio frequency front-end circuit according to an embodiment of the present application;

[0042] FIG. 14 is a structural schematic diagram of a radio frequency front-end circuit according to an embodiment of the present application;

[0043] FIG. 15 is a schematic diagram of a radio frequency signal flow direction according to an embodiment of the present application;

[0044] FIG. 16 is a schematic diagram of a radio frequency signal flow direction according to an embodiment of the present application;

[0045] FIG. 17 is a structural schematic diagram of a radio frequency front-end circuit according to an embodiment of the present application;

[0046] FIG. 18 is a schematic diagram of a radio frequency signal flow direction according to an embodiment of the present application;

[0047] FIG. 19 is a schematic diagram of a radio frequency signal flow direction according to an embodiment of the present application;

[0048] FIG. 20 is a structural schematic diagram of a radio frequency front-end circuit according to an embodiment of the present application;

[0049] FIG. 21 is a schematic diagram of a radio frequency signal flow direction according to an embodiment of the present application;

[0050] FIG. 22 is a schematic diagram of a radio frequency signal flow direction according to an embodiment of the present application;

[0051] FIG. 23 is a structural schematic diagram of a radio frequency front-end circuit according to an embodiment of the present application;

[0052] FIG. 24 is a structural schematic diagram of a radio frequency front-end circuit according to an embodiment of the present application;

[0053] FIG. 25 is a structural schematic diagram of a harmonic suppression network according to an embodiment of the present application;

[0054] FIG. 26 is a schematic diagram of harmonic suppression effect of the harmonic suppression network according to an embodiment of the present application;

[0055] FIG. 27 is a structural schematic diagram of another harmonic suppression network according to an embodiment of the present application;

[0056] FIG. 28 is a schematic diagram of harmonic suppression effect of the harmonic suppression network according to an embodiment of the present application;

[0057] FIG. 29 is a structural schematic diagram of still another harmonic suppression network according to an embodiment of the present application;

[0058] FIG. 30 is a schematic diagram of harmonic suppression effect of the harmonic suppression network according to an embodiment of the present application;

[0059] FIG. 31 is a schematic diagram of harmonic suppression effect of the harmonic suppression network according to an embodiment of the present application;

[0060] FIG. 32 is a structural schematic diagram of still another harmonic suppression network according to an embodiment of the present application;

[0061] FIG. 33 is a schematic diagram of harmonic suppression effect of the harmonic suppression network according to an embodiment of the present application. DETAILED DESCRIPTION

[0062] First, some concepts involved in the present application are described.

[0063] The terms "first", "second", and the like involved in the embodiments of the present application are only used for distinguishing the same type of features, and should not be understood as indicating relative importance, quantity, order, and the like.

[0064] The terms "exemplary" or "for example" and the like involved in the embodiments of the present application are used to represent an example, illustration, or description. Any embodiment or design scheme described as "exemplary" or "for example" in the present application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. Rather, the terms "exemplary" or "for example" are intended to present the relevant concept in a specific manner.

[0065] The terms "coupled" and "connected" involved in the embodiments of the present application should be interpreted in a broad sense, for example, can refer to a direct physical connection, or an indirect connection through electronic devices, such as a connection through resistors, inductors, capacitors, or other electronic devices.

[0066] China Satellite Telecommunications (hereinafter referred to as China Satellite) ) refers to a communication service that realizes voice call, short message sending, data transmission and related value-added services through Tianhong No. 1 satellite.

[0067] Beidou satellite communication (referred to as Beidou ) refers to receiving and sending short messages through Beidou satellite.

[0068] Star network satellite communication (referred to as Star network ) refers to data service communication through high-orbit satellites and low-orbit satellites. The embodiments of the present application can be used for Star network satellite communication of high-orbit satellites.

[0069] As shown in FIG. 1, the electronic device 101 provided by the embodiments of the present application is an electronic device with wireless communication function. The electronic device can be mobile or fixed. The electronic device can be deployed on land (such as indoors or outdoors, handheld or vehicle-mounted, etc.), on water (such as ships, etc.), or in the air (such as airplanes, balloons and satellites, etc.). The electronic device can be referred to as user equipment (user equipment, UE), access terminal, terminal unit, subscriber unit, terminal station, mobile station (mobile station, MS), mobile station, terminal agent or terminal device, etc. For example, the electronic device can be a mobile phone, a tablet computer, a notebook computer, a smart bracelet, a smart screen, a smart watch, a virtual reality (virtual reality, VR) device, an augmented reality (augmented reality, AR) device, a terminal in industrial control, a terminal in self driving, a terminal in remote medical, a terminal in smart grid, a terminal in transportation safety, a terminal in smart city, a terminal in smart home, etc. The embodiments of the present application do not limit the specific type and structure of the electronic device. A possible structure of the electronic device is described below.

[0070] As shown in FIG. 1A, the electronic device 101 can include a front camera 2931 and a display screen 294. As shown in FIG. 1B, the electronic device 101 can include a back camera 2932. The front camera 2931 and the back camera 2932 are used to take still images or dynamic videos (which can be collectively referred to as images). The display screen 294 is used to display images or receive touch operations of the user.

[0071] The electronic device can perform cellular communication (e.g., 2G / 3G / 4G / 5G communication) and satellite communication (e.g., Beidou satellite communication, Tianhong satellite communication, Xingwang satellite communication). The satellite communication module is independent of the cellular communication module, and the satellite communication requires much more power than the cellular communication. For example, the power required for 4G or 5G power level 2 is 26 dBm, the power required for 2G low frequency band is 33 dBm, and the power required for satellite communication is as high as 35 dBm or more. The radio frequency front-end chip of the cellular communication uses a radio frequency front-end mobile industry processor interface (RFFE MIPI) protocol to control the devices in the radio frequency front-end chip, while the radio frequency front-end chip of the satellite communication does not support the RFFE MIPI protocol, so the radio frequency front-end chip of the cellular communication cannot be used for satellite communication.

[0072] Various satellite communication modules have independent baseband chips, RFICs, and radio frequency front-end chips. For example, the Tianhong satellite communication module has a Tianhong baseband chip, a Tianhong RFIC, and a Tianhong radio frequency front-end chip, the Beidou satellite communication module has a Beidou baseband chip, a Beidou RFIC, and a Beidou radio frequency front-end chip, and the Xingwang satellite communication module has an Xingwang baseband chip, an Xingwang RFIC, and an Xingwang radio frequency front-end chip. In the prior art, the package size of the Tianhong radio frequency front-end chip is 5mm*5mm, and the package size of the Beidou radio frequency front-end chip is 5mm*4mm.

[0073] As shown in FIG. 2, the electronic device includes a processor 210 and a satellite communication module 30. The satellite communication module 30 can include a baseband chip 31, a radio frequency integrated circuit (RFIC) 32, and a radio frequency front-end circuit 33. The baseband chip 31 and the RFIC 32 can also be integrated with the processor 210 in a SoC.

[0074] The baseband chip 31 is used to convert data from the processor 210 into a baseband signal, including modulating and demodulating, digitally filtering, and equalizing the baseband signal. The baseband chip 31 is also used to control the switches in the radio frequency front-end circuit 33. The RFIC 32 is used to convert the baseband signal from the baseband chip 31 into a radio frequency signal, which is amplified in power by the radio frequency front-end circuit 33 and then transmitted from the antenna 34. The radio frequency front-end circuit 33 can also amplify the radio frequency signal received from the antenna 34 in power and then send it to the RFIC 32, which converts the radio frequency signal into a baseband signal and sends it to the baseband chip 31. The baseband chip 31 converts the baseband signal into data and sends it to the processor 210.

[0075] As shown in FIG. 3 and FIG. 4, in the prior art, for an electronic device including multiple satellite communication modules, the radio frequency front-end circuit 33 includes: a first radio frequency front-end chip 401, a first low noise amplifier (LNA) 402, a first switch 403, a filter 404, a filter 405, a second radio frequency front-end chip 411, a second LNA 412, a second switch 413, a filter 414, a filter 415, and a filter 416. The first radio frequency front-end chip 401 includes a first power amplifier (PA) 4011, a coupler 4012. The second radio frequency front-end chip 411 includes a second PA 4111. The first radio frequency front-end chip 401 and the first LNA 402 are used for Tianhong satellite communication, and the second radio frequency front-end chip 411 and the second LNA 412 are used for Beidou satellite communication. The first switch 403 and the second switch 413 are single pole four throw (SP4T) switches.

[0076] The LNA and the PA involved in the embodiments of the present application are used for power amplification of radio frequency signals, wherein the noise figure of the LNA is very low, and the LNA is suitable for power amplification of weak received radio frequency signals, and the PA is suitable for power amplification of transmitted radio frequency signals. The filter is used to filter out stray signals outside the radio frequency signal band. The coupler is used to couple the radio frequency signal in the straight-through path (the path between the input end and the straight-through end of the coupler) to the coupling path (the path between the coupling end and the isolation end of the coupler), and output through the coupling end. When electrically connected with the PA, it can be used for closed-loop power control of the PA.

[0077] As shown in FIG. 3, two satellite communications and cellular communication share the same antenna. The first end of the filter 404 is the input end of the radio frequency signal, which is electrically connected with the RFIC 32 in FIG. 2. The second end of the filter 404 is electrically connected with the input end of the first PA 4011. The output end of the first PA 4011 is electrically connected with the input end of the coupler 4012. The coupling end of the coupler 4012 is electrically connected with the baseband chip 31 in FIG. 2. The through end of the coupler 4012 is electrically connected with the first gating end of the first switch 403. The common end of the first switch 403 is electrically connected with the first antenna 341. The second gating end of the first switch 403 is electrically connected with the common end of the second switch 413. The third gating end of the first switch 403 is electrically connected with the input end of the first LNA 402. The output end of the first LNA 402 is electrically connected with the second end of the filter 405. The first end of the filter 405 is electrically connected with the RFIC 32 in FIG. 2. The fourth gating end of the first switch 403 is electrically connected with the cellular communication module. The first end of the filter 414 is the input end of the radio frequency signal, which is electrically connected with the RFIC 32 in FIG. 2. The second end of the filter 414 is electrically connected with the input end of the second PA 4111. The output end of the second PA 4111 is electrically connected with the first gating end of the second switch 413. The third gating end of the second switch 413 is electrically connected with the second end of the filter 416. The first end of the filter 416 is electrically connected with the input end of the second LNA 412. The output end of the second LNA 412 is electrically connected with the second end of the filter 415. The first end of the filter 415 is electrically connected with the RFIC 32 in FIG. 2. The fourth gating end of the first switch 403 is electrically connected with the cellular communication module.

[0078] The difference between FIG. 4 and FIG. 3 is that two satellite communications in FIG. 4 use independent antennas, and each satellite communication can share the antenna with the cellular communication. The second gating end of the first switch 403 is suspended. The common end of the second switch 413 is electrically connected with the second antenna 342. Other contents refer to the description of FIG. 3, which will not be repeated here.

[0079] The working principle of the radio frequency front-end circuit shown in FIG. 3 and FIG. 4 is as follows:

[0080] When the electronic device transmits a radio frequency signal through the Tianhong satellite communication, the baseband chip 31 in FIG. 2 controls the common end of the first switch 403 to be conductive with the first gating end, the radio frequency signal from the RFIC 32 shown in FIG. 2 enters the filter 404, then the radio frequency signal is power amplified by the first PA 4011, is transmitted to the first antenna 341 through the first switch 403, and is emitted through the first antenna 341. When the electronic device receives a radio frequency signal through the Tianhong satellite communication, the baseband chip 31 in FIG. 2 controls the common end of the first switch 403 to be conductive with the third gating end, the radio frequency signal from the first antenna 341 is transmitted to the first LNA 402 through the first switch 403 for power amplification, and is transmitted to the RFIC 32 shown in FIG. 2 through the filter 405.

[0081] When the electronic device transmits a radio frequency signal through the Beidou satellite communication, the baseband chip 31 in FIG. 2 controls the common end of the first switch 403 in FIG. 3 to be conductive with the second gating end, controls the common end of the second switch 413 to be conductive with the first gating end, the radio frequency signal from the RFIC 32 shown in FIG. 2 enters the filter 414, then the radio frequency signal is power amplified by the second PA 4111, is transmitted to the first antenna 341 through the second switch 413 and the first switch 403, and is emitted through the first antenna 341. Alternatively, the baseband chip 31 in FIG. 2 controls the common end of the second switch 413 in FIG. 4 to be conductive with the first gating end, the radio frequency signal from the RFIC 32 shown in FIG. 2 enters the filter 414, is power amplified by the second PA 4111, is transmitted to the second antenna 342 through the second switch 413, and is emitted through the second antenna 342.

[0082] When the electronic device receives a radio frequency signal through the Beidou satellite communication, the baseband chip 31 in FIG. 2 controls the common end of the first switch 403 in FIG. 3 to be conductive with the second gating end, controls the common end of the second switch 413 to be conductive with the third gating end, the radio frequency signal from the first antenna 341 is transmitted to the filter 416 through the first switch 403 and the second switch 413, is transmitted to the second LNA 412 through the filter 416 for power amplification, and is transmitted to the RFIC 32 shown in FIG. 2 through the filter 415. Alternatively, the baseband chip 31 in FIG. 2 controls the common end of the second switch 413 in FIG. 4 to be conductive with the third gating end, the radio frequency signal from the second antenna 342 is transmitted to the filter 416 through the second switch 413, is transmitted to the second LNA 412 through the filter 416 for power amplification, and is transmitted to the RFIC 32 shown in FIG. 2 through the filter 415.

[0083] For the radio frequency front-end circuit shown in FIG. 3, since the radio frequency link margin of the Tianhong satellite communication is more nervous, the requirements for the transmitting power and the receiving sensitivity are higher, therefore the transmitting and receiving of the Tianhong satellite communication only passes through one stage of switch. The radio frequency link margin of the Beidou satellite communication is more sufficient, therefore the transmitting and receiving of the Beidou satellite communication passes through two stages of switch. However, the radio frequency front-end circuit shown in FIG. 3 will still cause the performance of the transmitting and receiving of the Beidou satellite communication to decline, compared with the radio frequency front-end circuit shown in FIG. 4.

[0084] In some cases, there are many versions of the same electronic device, some versions support the Tianhong satellite communication, some versions support the Beidou satellite communication, and some versions support both the Tianhong satellite communication and the Beidou satellite communication. If the same circuit version is used for multiple versions, even if some versions only support the Tianhong satellite communication, the positions of the radio frequency devices for the Beidou satellite communication need to be reserved, which increases the area of the circuit board. And when supporting both the Tianhong satellite communication and the Beidou satellite communication, many radio frequency devices are needed, which increases the cost.

[0085] Therefore, another radio frequency front-end chip and radio frequency front-end circuit are provided in the present application, in which a radio frequency signal of one satellite communication mode in multiple satellite communications (such as Tianhong, Beidou, and Xingwang) is input into the PA through a switch, and the PA performs power amplification on the radio frequency signal, so that one radio frequency front-end chip is not needed for each satellite communication, thereby reducing the number of radio frequency front-end chips.

[0086] As shown in FIG. 5, the radio frequency front-end chip 601 includes a PA 6011, a coupler 6012, a switch 6013, a control circuit 6014, a bias circuit 6015, a first capacitor C1, and a second capacitor C2. As shown in FIG. 5 and FIG. 6, the radio frequency front-end chip 601 further includes multiple input pins, control pins, a first power supply pin VCC1, a second power supply pin VCC2, a third power supply pin VBATT, an antenna pin ANT, a coupling output pin CPL OUT, and a detection pin VDET. As shown in FIG. 6, the radio frequency front-end chip 601 further includes multiple ground pins GND for grounding. For example, the multiple input pins include a first input pin TX IN1, a second input pin TX IN2, and a third input pin TX IN3. The multiple control pins include a first control pin CTL1 and a second control pin CTL2. It should be noted that the multiple input pins can also include more (for example, 4) or fewer (for example, 2) input pins to adapt to inputting radio frequency signals of different satellite communication modes.

[0087] The plurality of input pins are electrically connected with the plurality of gating terminals of the switch 6013 respectively, for inputting radio frequency signals of different satellite communication modes. Among them, the first input pin TX IN1 is electrically connected with the second terminal of the switch 6013, the second input pin TX IN2 is electrically connected with the second gating terminal of the switch 6013, and the third input pin TX IN3 is electrically connected with the third gating terminal of the switch 6013. The first input pin TX IN1, the second input pin TX IN2, and the third input pin TX IN3 are used to be electrically connected with the RFIC 32 shown in FIG. 2, to input radio frequency signals of different satellite communications. For example, in FIG. 7, the first radio frequency signal input by the first input pin TX IN1 is a radio frequency signal of Tianhong satellite communication, the second radio frequency signal input by the second input pin TX IN2 is a radio frequency signal of Beidou satellite communication, and the third radio frequency signal input by the third input pin TX IN3 is a radio frequency signal of Xingwang satellite communication.

[0088] It should be noted that the number of input pins is the same as the number of gating terminals of the switch, and as the number of input pins increases, the number of gating terminals of the switch increases, and the number of control pins can also increase accordingly, for example, one control pin can control at least two gating terminals (and at least two input pins) to be conductive with the common terminal, two control pins can control at least four gating terminals (and at least four input pins) to be conductive with the common terminal, and so on, and K control pins can control at least 2^K gating terminals (and at least 2^K input pins) to be conductive with the common terminal.

[0089] The control terminal of the switch 6013 is electrically connected with the control circuit 6014, the control circuit 6014 is electrically connected with the baseband chip 31 shown in FIG. 2 through the control pin (such as the first control pin CTL1 and the second control pin CTL2), the control circuit 6014 is electrically connected with the power supply through the third power supply pin VBATT, and the control circuit 6014 is also electrically connected with the bias circuit 6015. The bias circuit 6015 is electrically connected with the PA 6011, and the PA 6011 is also electrically connected with the power supply through the first power supply pin VCC1 and the second power supply pin VCC2. The common terminal of the switch 6013 is electrically connected with the first terminal of the first capacitor C1, the second terminal of the first capacitor C1 is electrically connected with the input terminal of the PA 6011, the output terminal of the PA 6011 is electrically connected with the input terminal of the coupler 6012, the through terminal of the coupler 6012 is electrically connected with the first terminal of the second capacitor C2, and the coupling terminal of the coupler 6012 is electrically connected with the baseband chip 31 shown in FIG. 2 through the coupling output pin CPL OUT and the detection pin VDET. The second terminal of the second capacitor C2 is electrically connected with the antenna pin ANT, and the antenna pin ANT is used to be electrically connected with the antenna.

[0090] It should be noted that, unless otherwise specified, the first port of the switch in the present application is a common port, and the other ports of the switch except the control port are all gating ports, any one of the gating ports can be connected with the common port, and the names of the gating ports of the switch can be exchanged, which does not affect the protection scope of the embodiments of the present application. For example, a device connected with the first gating port of the switch can be replaced by a device connected with the second gating port of the switch.

[0091] The packaging size of the radio frequency front-end chip 601 in FIG. 6 is 3.5mm*3.5mm, which is smaller than the sizes of the radio frequency front-end chips of the Beidou and the Tianhong in the prior art (5mm*5m and 5mm*4mm respectively), and at least one radio frequency front-end chip is saved when supporting multiple satellite communication modes, which is more conducive to the layout on the circuit board. The switch 6013 in FIG. 5 is a single-pole three-throw (SP3T) switch, which is used to connect one of the first gating port, the second gating port and the third gating port with the common port. The PA 6011 in FIG. 5 can amplify the power of the radio frequency signals in the L band and the S band (1.61GHz-2.01GHz) in satellite communication, wherein the Beidou satellite communication is located at 1.61-1.6265GHz, the Star Network satellite communication is offset at 1.668-1.675GHz, and the Tianhong satellite communication is located at 1.98-2.01GHz. The first capacitor C1 and the second capacitor C2 in FIG. 5 are used to isolate direct current.

[0092] As shown in FIG. 6, the packaging of the radio frequency front-end chip 601 is a quadrilateral (for example, a rectangle or a square), which includes four sides and four corners. A ground pin GND (pin number 21) is located in the middle of the quadrilateral, and other pins are distributed around the ground pin GND. Among them, a plurality of input pins such as a first input pin TX IN1 (pin number 7), a second input pin TX IN2 (pin number 8), a third input pin TX IN3 (pin number 9), and a ground pin (pin number 10) are located on the first side of the quadrilateral. A first power supply pin VCC1 (pin number 12), a second power supply pin VCC2 (pin number 14), and two ground pins GND (pin numbers 13 / 15) are located on the second side. An antenna pin ANT (pin number 20), a coupled output pin CPL OUT (pin number 18), and two ground pins (pin numbers 17 / 19) are located on the third side. Four ground pins GND (pin numbers 1 / 6 / 11 / 16) are respectively located at the four corners. A first control pin CTL1 (pin number 3), a second control pin CTL2 (pin number 4), a detection pin VDET (pin number 2), and a third power supply pin VBATT (pin number 5) are located on the fourth side of the quadrilateral.

[0093] The plurality of input pins are located on the same side, which facilitates the wiring of the radio frequency front-end chip 601. The plurality of input pins are used for inputting radio frequency signals, and the antenna pin ANT and the coupling output pin CPL OUT are used for outputting radio frequency signals. Therefore, the first side on which the plurality of input pins are located is opposite to the third side on which the antenna pin ANT and the coupling output pin CPL OUT are located, so as to avoid mutual coupling and interference.

[0094] The control pin and the detection pin VDET are both direct current signals, are located on the same side, and are not located on the same side as the radio frequency signals, so as to avoid being interfered by the radio frequency signals. The third power supply pin VBATT and the control pin are both electrically connected to the control circuit. Therefore, the third power supply pin VBATT and the control pin are also located on the same side, so as to shorten the internal wiring distance. The first power supply pin VCC1 and the second power supply pin VCC2 are both used for supplying power to the PA. Therefore, the first power supply pin VCC1 and the second power supply pin VCC2 are also located on the same side, so as to shorten the internal wiring distance. The remaining pins are all ground pins, and the plurality of ground pins GND are distributed at the center and the four corners of the radio frequency front-end chip 601, so as to achieve good grounding of the radio frequency front-end chip 601 and reduce the interference of external signals on the internal part of the radio frequency front-end chip 601.

[0095] The functions of the various pins of the radio frequency front-end chip 601 and other devices in FIGS. 5 and 6 are shown in Table 1. Among them, the first control pin CTL1 and the second control pin CTL2 are controlled by the baseband chip 31 in FIG. 2, and the control logic of the first control pin CTL1 and the second control pin CTL2 is shown in Table 2. Since the gain requirement of the radio frequency signal is relatively high in the satellite communication of China Telecom and the satellite network communication, when the first input pin TX IN1 or the third input pin TX IN3 is turned on in Table 2, the attenuation value of the path between the first input pin TX IN1 or the third input pin TX IN3 and the switch 6013 is relatively low, and the PA gain is relatively high. Since the gain requirement of the radio frequency signal is relatively low in the satellite communication of Beidou, when the second input pin TX IN2 is turned on in Table 2, the attenuation value of the path between the second input pin TX IN2 and the switch 6013 can be relatively high, and the PA gain can be relatively low. The attenuation of the path can be T-type attenuation, π-type attenuation or resistance. It should be noted that Table 1 and Table 2 are only examples and are not intended to be limited thereto.

[0096] Table 1

[0097] Table 2

[0098] Embodiments of the present application provide a radio frequency front-end circuit, which can be applied to three satellite communication (Tiantong, Beidou, and Star Network) scenarios. As shown in FIG. 7, the radio frequency front-end circuit includes a radio frequency front-end chip 601, a harmonic suppression network 602, a first switch 603, a first LNA 605, a second LNA 604, a second switch 606, a filter 607, a filter 608, a filter 609, a filter 610, a filter 611, a filter 612, and a filter 613. The first switch 603 is an SP4T switch, and the second switch 606 is an SPDT (single pole double throw) switch. If satellite communication does not need to share an antenna with cellular communication, the first switch 603 can be reduced by one port (the fourth gating end) to become an SP3T. The radio frequency front-end chip 601, the first switch 603, and the second switch 606 involved in the embodiments of the present application are all controlled by the baseband chip 31 in FIG. 2.

[0099] The first end of the filter 607 is an input end of the first radio frequency signal, configured to be electrically connected with the RFIC 32 in FIG. 2, and the second end of the filter 607 is electrically connected with the first input pin TX IN1 of the radio frequency front-end chip 601. The first end of the filter 608 is an input end of the second radio frequency signal, configured to be electrically connected with the RFIC 32 in FIG. 2, and the second end of the filter 608 is electrically connected with the second input pin TX IN2 of the radio frequency front-end chip 601. The first end of the filter 609 is an input end of the third radio frequency signal, configured to be electrically connected with the RFIC 32 in FIG. 2, and the second end of the filter 609 is electrically connected with the third input pin TX IN3 of the radio frequency front-end chip 601. The first control pin CTL1 and the second control pin CTL2 of the radio frequency front-end chip 601 are configured to be electrically connected with the baseband chip 31 shown in FIG. 2, and the third power supply pin VBATT, the first power supply pin VCC1 and the second power supply pin VCC2 are configured to be electrically connected with a power supply. The coupling output pin CPL OUT and the detection pin VDET of the radio frequency front-end chip 601 are configured to be electrically connected with the baseband chip 31 shown in FIG. 2. The antenna pin ANT of the radio frequency front-end chip 601 is electrically connected with the first end of the harmonic suppression network 602. The second end of the harmonic suppression network 602 is electrically connected with the second end of the first switch 603, the common end of the first switch 403 is electrically connected with the antenna 34, the second gating end of the first switch 603 is electrically connected with the second end of the filter 611, the first end of the filter 611 is electrically connected with the input end of the second LNA 604, the output end of the second LNA 604 is electrically connected with the second end of the filter 610, the first end of the filter 610 is an output end of the second radio frequency signal, configured to be electrically connected with the RFIC 32 shown in FIG. 2. The third gating end of the first switch 603 is electrically connected with the input end of the first LNA 605, the output end of the first LNA 605 is electrically connected with the common end of the second switch 606, the first gating end of the second switch 606 is electrically connected with the second end of the filter 612, the first end of the filter 612 is an output end of the first radio frequency signal, configured to be electrically connected with the RFIC 32 in FIG. 2, the second gating end of the second switch 606 is electrically connected with the second end of the filter 613, the first end of the filter 613 is an output end of the third radio frequency signal, configured to be electrically connected with the RFIC 32 in FIG. 2, and the fourth gating end of the first switch 603 is configured to be electrically connected with a cellular communication module.

[0100] As shown by the solid arrows in FIG. 8, when the electronic device transmits a radio frequency signal through the Tianhong satellite communication, the baseband chip 31 in FIG. 2 controls the common terminal of the first switch 603 to be conductive with the first gating terminal, controls the common terminal of the switch 6013 to be conductive with the first gating terminal through the control circuit 6014, the radio frequency signal from the RFIC 32 shown in FIG. 2 enters the filter 607, and then the radio frequency signal is transmitted to the PA 6011 through the switch 6013 and the first capacitor C1. The PA 6011 performs power amplification on the radio frequency signal, the radio frequency signal is transmitted to the antenna 34 through the coupler 6012, the second capacitor C2, the harmonic suppression network 602, and the first switch 603, and is emitted through the antenna 34.

[0101] As shown by the dashed arrows in FIG. 8, when the electronic device receives a radio frequency signal through the Tianhong satellite communication, the baseband chip 31 in FIG. 2 controls the common terminal of the first switch 603 to be conductive with the third gating terminal, controls the common terminal of the second switch 606 to be conductive with the first gating terminal, the radio frequency signal from the antenna 34 is transmitted to the first LNA 605 through the first switch 603, the first LNA 605 performs power amplification on the radio frequency signal, and the radio frequency signal is transmitted to the RFIC 32 shown in FIG. 2 through the second switch 606 and the filter 612.

[0102] As shown by the solid arrows in FIG. 9, when the electronic device transmits a radio frequency signal through the Beidou satellite communication, the baseband chip 31 in FIG. 2 controls the common terminal of the first switch 603 to be conductive with the first gating terminal, controls the common terminal of the switch 6013 to be conductive with the second gating terminal through the control circuit 6014, the radio frequency signal from the RFIC 32 shown in FIG. 2 enters the filter 608, and then the radio frequency signal is transmitted to the PA 6011 through the switch 6013 and the first capacitor C1. The PA 6011 performs power amplification on the radio frequency signal, the radio frequency signal is transmitted to the antenna 34 through the coupler 6012, the second capacitor C2, the harmonic suppression network 602, and the first switch 603, and is emitted through the antenna 34.

[0103] As shown by the dashed arrows in FIG. 9, when the electronic device receives a radio frequency signal through the Beidou satellite communication, the baseband chip 31 in FIG. 2 controls the common terminal of the first switch 603 to be conductive with the second gating terminal, the radio frequency signal from the antenna 34 is transmitted to the second LNA 604 through the first switch 603 and the filter 611, the second LNA 604 performs power amplification on the radio frequency signal, and the radio frequency signal is transmitted to the RFIC 32 shown in FIG. 2 through the filter 610.

[0104] As shown by the solid arrows in FIG. 10, when the electronic device transmits a radio frequency signal through the satellite communication of Star Network, the baseband chip 31 in FIG. 2 controls the common terminal of the first switch 603 to be conductive with the first gating terminal, controls the common terminal of the switch 6013 to be conductive with the second gating terminal through the control circuit 6014, and the radio frequency signal from the RFIC 32 shown in FIG. 2 enters the filter 609, and then the radio frequency signal is transmitted to the PA 6011 through the switch 6013 and the first capacitor C1, the radio frequency signal is power amplified by the PA 6011, and the radio frequency signal is transmitted to the antenna 34 through the coupler 6012, the second capacitor C2, the harmonic suppression network 602, and the first switch 603, and is emitted through the antenna 34.

[0105] As shown by the dashed arrows in FIG. 10, when the electronic device receives a radio frequency signal through the satellite communication of Star Network, the baseband chip 31 in FIG. 2 controls the common terminal of the first switch 603 to be conductive with the third gating terminal, and controls the common terminal of the second switch 606 to be electrically connected with the second gating terminal, the radio frequency signal from the antenna 34 is transmitted to the first LNA 605 through the first switch 603, the radio frequency signal is power amplified by the first LNA 605, and the radio frequency signal is transmitted to the RFIC 32 shown in FIG. 2 through the second switch 606 and the filter 613.

[0106] It should be noted that the signal-to-noise ratio of the downlink of the satellite communication of Beidou is high enough, and although the insertion loss will be increased by adding a filter (the filter 611) at the input terminal of the LNA, the out-of-band noise signal can be filtered out, thereby avoiding the influence of the out-of-band interference signal on the LNA. The signal-to-noise ratio of the downlink of the satellite communication of Tian Gang and Star Network is not high enough, and adding a filter will result in a lower noise ratio, reduce the receiving sensitivity, and cause signal connection problems, so it is not convenient to add a filter at the input terminal of the LNA.

[0107] In addition to the above scenarios supporting three satellite communication modes, some electronic devices support fewer satellite communications to reduce costs. For example, the embodiments of the present application provide a radio frequency front-end circuit which can be applied to the scenario that the electronic device supports one satellite communication mode. It is not necessary to additionally reserve another set of radio frequency front-end chips on the circuit board, thereby saving the area of the circuit board. The radio frequency front-end circuit shown in FIG. 11 can be used for the satellite communication of Tian Gang, the radio frequency front-end circuit shown in FIG. 12 can be used for the satellite communication of Star Network, and the radio frequency front-end circuit shown in FIG. 13 can be used for the satellite communication of Beidou.

[0108] As shown in FIG. 11, the radio frequency front-end circuit includes a radio frequency front-end chip 601, a harmonic suppression network 602, a first switch 603, a first LNA 605, a filter 607, a filter 612. The first switch 603 is an SP4T switch or an SP3T switch, and if satellite communication does not need to share an antenna with cellular communication, the first switch 603 can reduce one port (the fourth gating terminal) and become an SP3T or SPDT switch.

[0109] A first end of the filter 607 is an input end of the radio frequency signal, used to be electrically connected with the RFIC 32 in FIG. 2, and a second end of the filter 607 is electrically connected with a first input pin TX IN1 of the radio frequency front-end chip 601. A first control pin CTL1 and a second control pin CTL2 of the radio frequency front-end chip 601 are used to be electrically connected with the baseband chip 31 shown in FIG. 2, and a third power supply pin VBATT, a first power supply pin VCC1 and a second power supply pin VCC2 are used to be electrically connected with a power supply. A coupling output pin CPL OUT and a detection pin VDET of the radio frequency front-end chip 601 are used to be electrically connected with the baseband chip 31 shown in FIG. 2. An antenna pin ANT of the radio frequency front-end chip 601 is electrically connected with a first end of the harmonic suppression network 602. A second end of the harmonic suppression network 602 is electrically connected with a second end of the first switch 603, and a common terminal of the first switch 403 is electrically connected with the antenna 34. A third gating terminal of the first switch 603 is electrically connected with an input end of the first LNA 605, and an output end of the first LNA 605 is electrically connected with a second end of the filter 612. A first end of the filter 612 is an output end of the radio frequency signal, used to be electrically connected with the RFIC 32 shown in FIG. 2. A fourth gating terminal of the first switch 603 is used to be electrically connected with a cellular communication module.

[0110] When the electronic device transmits a radio frequency signal, the baseband chip 31 in FIG. 2 controls the common terminal and the first gating terminal of the first switch 603 to be conductive, controls the common terminal and the first gating terminal of the switch 6013 to be conductive through the control circuit 6014, and the radio frequency signal from the RFIC 32 shown in FIG. 2 enters the filter 607, and then the radio frequency signal is transmitted to the PA 6011 through the switch 6013, the first capacitor C1, and the radio frequency signal is power amplified by the PA 6011. The radio frequency signal is transmitted to the antenna 34 through the coupler 6012, the second capacitor C2, the harmonic suppression network 602 and the first switch 603, and is emitted through the antenna 34.

[0111] When the electronic device receives a radio frequency signal, the baseband chip 31 in FIG. 2 controls the common terminal and the third gating terminal of the first switch 603 to be conductive, and the radio frequency signal from the antenna 34 is transmitted to the first LNA 605 through the first switch 603, and the radio frequency signal is power amplified by the first LNA 605. The radio frequency signal is transmitted to the RFIC 32 shown in FIG. 2 through the filter 612.

[0112] As shown in FIG. 12, the radio frequency front-end circuit includes a radio frequency front-end chip 601, a harmonic suppression network 602, a first switch 603, a first LNA 605, a filter 609, a filter 612. The first switch 603 is a SP4T switch or a SP3T switch, if the satellite communication does not need to share the antenna with the cellular communication, the first switch 603 can reduce one port (the fourth gating terminal) and become a SP3T or SPDT switch.

[0113] The first end of the filter 609 is the input end of the radio frequency signal, which is used to be electrically connected with the RFIC 32 in FIG. 2, and the second end of the filter 609 is electrically connected with the third input pin TX IN3 of the radio frequency front-end chip 601. The first control pin CTL1 and the second control pin CTL2 of the radio frequency front-end chip 601 are used to be electrically connected with the baseband chip 31 shown in FIG. 2, and the third power supply pin VBATT, the first power supply pin VCC1 and the second power supply pin VCC2 are used to be electrically connected with the power supply. The coupling output pin CPL OUT and the detection pin VDET of the radio frequency front-end chip 601 are used to be electrically connected with the baseband chip 31 shown in FIG. 2. The antenna pin ANT of the radio frequency front-end chip 601 is electrically connected with the first end of the harmonic suppression network 602. The second end of the harmonic suppression network 602 is electrically connected with the second end of the first switch 603, and the common terminal of the first switch 403 is electrically connected with the antenna 34. The third gating terminal of the first switch 603 is electrically connected with the input end of the first LNA 605, and the output end of the first LNA 605 is electrically connected with the second end of the filter 612. The first end of the filter 612 is the output end of the radio frequency signal, which is used to be electrically connected with the RFIC 32 shown in FIG. 2. The fourth gating terminal of the first switch 603 is used to be electrically connected with the cellular communication module.

[0114] When the electronic device transmits the radio frequency signal, the baseband chip 31 in FIG. 2 controls the common terminal and the first gating terminal of the first switch 603 to be conductive, controls the common terminal and the third gating terminal of the switch 6013 to be conductive through the control circuit 6014, and the radio frequency signal from the RFIC 32 shown in FIG. 2 enters the filter 609, and then the radio frequency signal is transmitted to the PA 6011 through the switch 6013 and the first capacitor C1. The PA 6011 amplifies the power of the radio frequency signal, and the radio frequency signal is transmitted to the antenna 34 through the coupler 6012, the second capacitor C2, the harmonic suppression network 602 and the first switch 603, and is emitted through the antenna 34.

[0115] When the electronic device receives the radio frequency signal, the baseband chip 31 in FIG. 2 controls the common terminal of the first switch 603 to be conductive with the third gating terminal, the radio frequency signal from the antenna 34 is transmitted to the first LNA 605 through the first switch 603, the radio frequency signal is power amplified by the first LNA 605, and the radio frequency signal is transmitted to the RFIC 32 shown in FIG. 2 through the filter 612.

[0116] As shown in FIG. 13, the radio frequency front-end circuit includes a radio frequency front-end chip 601, a harmonic suppression network 602, a first switch 603, a second LNA 604, a filter 608, a filter 610, and a filter 611. The first switch 603 is an SP4T switch or an SP3T switch. If satellite communication does not need to share an antenna with cellular communication, the first switch 603 can reduce one port (the fourth gating terminal) and become an SP3T or SPDT switch.

[0117] The first end of the filter 608 is an input end of the radio frequency signal, used to be electrically connected with the RFIC 32 in FIG. 2, and the second end of the filter 608 is electrically connected with the second input pin TX IN2 of the radio frequency front-end chip 601. The first control pin CTL1 and the second control pin CTL2 of the radio frequency front-end chip 601 are used to be electrically connected with the baseband chip 31 shown in FIG. 2, and the third power supply pin VBATT, the first power supply pin VCC1, and the second power supply pin VCC2 are used to be electrically connected with a power supply. The coupling output pin CPL OUT and the detection pin VDET of the radio frequency front-end chip 601 are used to be electrically connected with the baseband chip 31 shown in FIG. 2. The antenna pin ANT of the radio frequency front-end chip 601 is electrically connected with the first end of the harmonic suppression network 602. The second end of the harmonic suppression network 602 is electrically connected with the second end of the first switch 603, and the common terminal of the first switch 403 is electrically connected with the antenna 34. The second gating terminal of the first switch 603 is electrically connected with the second end of the filter 611, the first end of the filter 611 is electrically connected with the input end of the second LNA 604. The output end of the second LNA 604 is electrically connected with the second end of the filter 610, and the first end of the filter 610 is an output end of the radio frequency signal, used to be electrically connected with the RFIC 32 shown in FIG. 2. The fourth gating terminal of the first switch 603 is used to be electrically connected with a cellular communication module.

[0118] When the electronic device transmits a radio frequency signal, the baseband chip 31 in FIG. 2 controls the common terminal of the first switch 603 to be conductive with the first gating terminal, controls the common terminal of the switch 6013 to be conductive with the second gating terminal through the control circuit 6014, the radio frequency signal from the RFIC 32 shown in FIG. 2 enters the filter 608, and then the radio frequency signal is transmitted to the PA 6011 through the switch 6013 and the first capacitor C1, the radio frequency signal is power amplified by the PA 6011, and the radio frequency signal is transmitted to the antenna 34 through the coupler 6012, the second capacitor C2, the harmonic suppression network 602 and the first switch 603, and is emitted through the antenna 34.

[0119] When the electronic device receives a radio frequency signal, the baseband chip 31 in FIG. 2 controls the common terminal of the first switch 603 to be conductive with the second gating terminal, the radio frequency signal from the antenna 34 is transmitted to the second LNA 604 through the first switch 603 and the filter 611, the radio frequency signal is power amplified by the second LNA 604, and the radio frequency signal is transmitted to the RFIC 32 shown in FIG. 2 through the filter 610.

[0120] The embodiment of the present application provides a radio frequency front-end circuit, which can be applied to a scenario in which an electronic device supports two satellite communication modes of Tianhong satellite communication and Xingwang satellite communication. As shown in FIG. 14, the radio frequency front-end circuit comprises a radio frequency front-end chip 601, a harmonic suppression network 602, a first switch 603, a first LNA 605, a second switch 606, a filter 607, a filter 609, a filter 612 and a filter 613. The first switch 603 is an SP4T switch or an SP3T switch, and the second switch 606 is an SPDT switch. If satellite communication does not need to share an antenna with cellular communication, the first switch 603 can reduce one port (the fourth gating terminal) and become an SP3T or SPDT switch.

[0121] The first end of the filter 607 is an input end of the radio frequency signal, used for electrical connection with the RFIC 32 in FIG. 2, and the second end of the filter 607 is electrically connected with the first input pin TX IN1 of the radio frequency front-end chip 601. The first end of the filter 609 is an input end of the radio frequency signal, used for electrical connection with the RFIC 32 in FIG. 2, and the second end of the filter 609 is electrically connected with the third input pin TX IN3 of the radio frequency front-end chip 601. The first control pin CTL1 and the second control pin CTL2 of the radio frequency front-end chip 601 are used for electrical connection with the baseband chip 31 shown in FIG. 2, and the third power supply pin VBATT, the first power supply pin VCC1 and the second power supply pin VCC2 are used for electrical connection with a power supply. The coupling output pin CPL OUT and the detection pin VDET of the radio frequency front-end chip 601 are used for electrical connection with the baseband chip 31 shown in FIG. 2. The antenna pin ANT of the radio frequency front-end chip 601 is electrically connected with the first end of the harmonic suppression network 602. The second end of the harmonic suppression network 602 is electrically connected with the second end of the first switch 603, the common end of the first switch 403 is electrically connected with the antenna 34, the third gating end of the first switch 603 is electrically connected with the input end of the first LNA 605, the output end of the first LNA 605 is electrically connected with the common end of the second switch 606, the first gating end of the second switch 606 is electrically connected with the second end of the filter 612, the first end of the filter 612 is an output end of the radio frequency signal, used for electrical connection with the RFIC 32 in FIG. 2, the second gating end of the second switch 606 is electrically connected with the second end of the filter 613, the first end of the filter 613 is an output end of the radio frequency signal, used for electrical connection with the RFIC 32 in FIG. 2, and the fourth gating end of the first switch 603 is used for electrical connection with a cellular communication module.

[0122] As shown by the solid arrow in FIG. 15, when the electronic device transmits a radio frequency signal through the Tianhong satellite communication, the baseband chip 31 in FIG. 2 controls the common end and the first gating end of the first switch 603 to be conductive, controls the common end and the first gating end of the switch 6013 to be conductive through the control circuit 6014, the radio frequency signal from the RFIC 32 shown in FIG. 2 enters the filter 607, and then the radio frequency signal is transmitted to the PA 6011 through the switch 6013 and the first capacitor C1, the radio frequency signal is power amplified by the PA 6011, and the radio frequency signal is transmitted to the antenna 34 through the coupler 6012, the second capacitor C2, the harmonic suppression network 602 and the first switch 603, and is emitted through the antenna 34.

[0123] As shown by the dashed arrows in FIG. 15, when the electronic device transmits a radio frequency signal through the Tianhong satellite communication, the baseband chip 31 in FIG. 2 controls the common terminal of the first switch 603 to be conductive with the third gating terminal, controls the common terminal of the second switch 606 to be conductive with the first gating terminal, and the radio frequency signal from the antenna 34 is transmitted to the first LNA 605 through the first switch 603, the radio frequency signal is power amplified by the first LNA 605, and the radio frequency signal is transmitted to the RFIC 32 shown in FIG. 2 through the second switch 606 and the filter 612.

[0124] As shown by the solid arrows in FIG. 16, when the electronic device transmits a radio frequency signal through the Xingwang satellite communication, the baseband chip 31 in FIG. 2 controls the common terminal of the first switch 603 to be conductive with the first gating terminal, controls the common terminal of the switch 6013 to be conductive with the third gating terminal through the control circuit 6014, the radio frequency signal from the RFIC 32 shown in FIG. 2 enters the filter 609, and then the radio frequency signal is transmitted to the PA 6011 through the switch 6013, the first capacitor C1, and the radio frequency signal is power amplified by the PA 6011, the radio frequency signal is transmitted to the antenna 34 through the coupler 6012, the second capacitor C2, the harmonic suppression network 602, the first switch 603, and the radio frequency signal is transmitted through the antenna 34.

[0125] As shown by the dashed arrows in FIG. 16, when the electronic device transmits a radio frequency signal through the Xingwang satellite communication, the baseband chip 31 in FIG. 2 controls the common terminal of the first switch 603 to be conductive with the third gating terminal, controls the common terminal of the second switch 606 to be conductive with the second gating terminal, and the radio frequency signal from the antenna 34 is transmitted to the first LNA 605 through the first switch 603, the radio frequency signal is power amplified by the first LNA 605, and the radio frequency signal is transmitted to the RFIC 32 shown in FIG. 2 through the second switch 606 and the filter 612.

[0126] The embodiment of the present application provides a radio frequency front-end circuit which can be applied to an electronic device supporting two satellite communication modes of the Beidou satellite communication and the Tianhong satellite communication. As shown in FIG. 17, the radio frequency front-end circuit comprises a radio frequency front-end chip 601, a harmonic suppression network 602, a first switch 603, a second LNA 604, a first LNA 605, a filter 607, a filter 608, a filter 610, a filter 611, and a filter 612. The first switch 603 is an SP4T switch or an SP3T switch, and if the satellite communication does not need to share the antenna with the cellular communication, the first switch 603 can reduce one port (the fourth gating terminal) and become an SP3T or SPDT switch.

[0127] The first end of the filter 607 is an input end of the radio frequency signal, used for electrical connection with the RFIC 32 in FIG. 2, and the second end of the filter 607 is electrically connected with the first input pin TX IN1 of the radio frequency front-end chip 601. The first end of the filter 608 is an input end of the radio frequency signal, used for electrical connection with the RFIC 32 in FIG. 2, and the second end of the filter 608 is electrically connected with the second input pin TX IN2 of the radio frequency front-end chip 601. The first control pin CTL1 and the second control pin CTL2 of the radio frequency front-end chip 601 are used for electrical connection with the baseband chip 31 shown in FIG. 2, and the third power supply pin VBATT, the first power supply pin VCC1 and the second power supply pin VCC2 are used for electrical connection with the power supply. The coupling output pin CPL OUT and the detection pin VDET of the radio frequency front-end chip 601 are used for electrical connection with the baseband chip 31 shown in FIG. 2. The antenna pin ANT of the radio frequency front-end chip 601 is electrically connected with the first end of the harmonic suppression network 602. The second end of the harmonic suppression network 602 is electrically connected with the second end of the first switch 603, the common end of the first switch 403 is electrically connected with the antenna 34, the second gating end of the first switch 603 is electrically connected with the second end of the filter 611, the first end of the filter 611 is electrically connected with the input end of the second LNA 604, the output end of the second LNA 604 is electrically connected with the second end of the filter 610, the first end of the filter 610 is an output end of the radio frequency signal, used for electrical connection with the RFIC 32 shown in FIG. 2. The third gating end of the first switch 603 is electrically connected with the input end of the first LNA 605, the output end of the first LNA 605 is electrically connected with the second end of the filter 612, the first end of the filter 612 is an output end of the radio frequency signal, used for electrical connection with the RFIC 32 in FIG. 2, and the fourth gating end of the first switch 603 is used for electrical connection with the cellular communication module.

[0128] As shown by the solid arrow in FIG. 18, when the electronic device transmits a radio frequency signal through the Tianhong satellite communication, the baseband chip 31 in FIG. 2 controls the common end and the first gating end of the first switch 603 to be conductive, controls the common end and the first gating end of the switch 6013 to be conductive through the control circuit 6014, the radio frequency signal from the RFIC 32 shown in FIG. 2 enters the filter 607, and then the radio frequency signal is transmitted to the PA 6011 through the switch 6013, the first capacitor C1, and the radio frequency signal is power amplified by the PA 6011. The radio frequency signal is transmitted to the antenna 34 through the coupler 6012, the second capacitor C2, the harmonic suppression network 602, and the first switch 603, and is emitted through the antenna 34.

[0129] As shown by the dashed arrows in FIG. 18, when the electronic device transmits a radio frequency signal through the Beidou satellite communication, the baseband chip 31 in FIG. 2 controls the common terminal and the first gating terminal of the first switch 603 to be conductive, controls the common terminal and the second gating terminal of the second switch 606 to be conductive, and the radio frequency signal from the antenna 34 is transmitted to the first LNA 605 through the first switch 603, the radio frequency signal is power amplified by the first LNA 605, and the radio frequency signal is transmitted to the RFIC 32 shown in FIG. 2 through the filter 612.

[0130] As shown by the solid arrows in FIG. 19, when the electronic device transmits a radio frequency signal through the Beidou satellite communication, the baseband chip 31 in FIG. 2 controls the common terminal and the first gating terminal of the first switch 603 to be conductive, controls the common terminal and the second gating terminal of the switch 6013 to be conductive through the control circuit 6014, and the radio frequency signal from the RFIC 32 shown in FIG. 2 enters the filter 608, and then the radio frequency signal is transmitted to the PA 6011 through the switch 6013 and the first capacitor C1, the radio frequency signal is power amplified by the PA 6011, and the radio frequency signal is transmitted to the antenna 34 through the coupler 6012, the second capacitor C2, the harmonic suppression network 602, the first switch 603, and is transmitted through the antenna 34.

[0131] As shown by the dashed arrows in FIG. 19, when the electronic device transmits a radio frequency signal through the Beidou satellite communication, the baseband chip 31 in FIG. 2 controls the common terminal and the first gating terminal of the first switch 603 to be conductive, controls the common terminal and the second gating terminal of the second switch 606 to be conductive, and the radio frequency signal from the antenna 34 is transmitted to the first LNA 605 through the first switch 603, the radio frequency signal is power amplified by the first LNA 605, and the radio frequency signal is transmitted to the RFIC 32 shown in FIG. 2 through the filter 612.

[0132] The embodiment of the present application provides a radio frequency front-end circuit which can be applied to the scenario that the electronic device supports two satellite communication modes of the Beidou satellite communication and the Tianwang satellite communication. As shown in FIG. 20, the radio frequency front-end circuit comprises a radio frequency front-end chip 601, a harmonic suppression network 602, a first switch 603, a second LNA 604, a first LNA 605, a filter 608, a filter 609, a filter 610, a filter 611 and a filter 613. The first switch 603 is an SP4T switch or an SP3T switch, and if the satellite communication does not need to share the antenna with the cellular communication, the first switch 603 can reduce one port (the fourth gating terminal) and become an SP3T or SPDT switch.

[0133] The first end of the filter 608 is an input end of the radio frequency signal, used for electrical connection with the RFIC 32 in FIG. 2, and the second end of the filter 608 is electrically connected with the second input pin TX IN2 of the radio frequency front-end chip 601. The first end of the filter 609 is an input end of the radio frequency signal, used for electrical connection with the RFIC 32 in FIG. 2, and the second end of the filter 609 is electrically connected with the third input pin TX IN3 of the radio frequency front-end chip 601. The first control pin CTL1 and the second control pin CTL2 of the radio frequency front-end chip 601 are used for electrical connection with the baseband chip 31 shown in FIG. 2, and the third power supply pin VBATT, the first power supply pin VCC1 and the second power supply pin VCC2 are used for electrical connection with a power supply. The coupling output pin CPL OUT and the detection pin VDET of the radio frequency front-end chip 601 are used for electrical connection with the baseband chip 31 shown in FIG. 2. The antenna pin ANT of the radio frequency front-end chip 601 is electrically connected with the first end of the harmonic suppression network 602. The second end of the harmonic suppression network 602 is electrically connected with the second end of the first switch 603, the common end of the first switch 403 is electrically connected with the antenna 34, the second gating end of the first switch 603 is electrically connected with the second end of the filter 611, the first end of the filter 611 is electrically connected with the input end of the second LNA 604, the output end of the second LNA 604 is electrically connected with the second end of the filter 610, the first end of the filter 610 is an output end of the radio frequency signal, used for electrical connection with the RFIC 32 shown in FIG. 2. The third gating end of the first switch 603 is electrically connected with the input end of the first LNA 605, the output end of the first LNA 605 is electrically connected with the second end of the filter 613, the first end of the filter 613 is an output end of the radio frequency signal, used for electrical connection with the RFIC 32 in FIG. 2, and the fourth gating end of the first switch 603 is used for electrical connection with a cellular communication module.

[0134] As shown by the solid arrow in FIG. 21, when the electronic device transmits a radio frequency signal through satellite communication, the baseband chip 31 in FIG. 2 controls the common end and the first gating end of the first switch 603 to be conductive, controls the common end and the third gating end of the switch 6013 to be conductive through the control circuit 6014, and the radio frequency signal from the RFIC 32 shown in FIG. 2 enters the filter 609, then the radio frequency signal is transmitted to the PA 6011 through the switch 6013, the first capacitor C1, and the radio frequency signal is power amplified by the PA 6011, and the radio frequency signal is transmitted to the antenna 34 through the coupler 6012, the second capacitor C2, the harmonic suppression network 602 and the first switch 603, and is emitted through the antenna 34.

[0135] As shown by the dashed arrows in FIG. 21, when the electronic device receives a radio frequency signal through satellite communication of the Starlink satellite, the baseband chip 31 in FIG. 2 controls the common terminal of the first switch 603 to be conductive with the third gating terminal, and controls the common terminal of the second switch 606 to be conductive with the first gating terminal. The radio frequency signal from the antenna 34 is transmitted to the first LNA 605 through the first switch 603, and the radio frequency signal is power amplified by the first LNA 605. The radio frequency signal is transmitted to the RFIC 32 shown in FIG. 2 through the filter 613.

[0136] As shown by the solid arrows in FIG. 22, when the electronic device transmits a radio frequency signal through satellite communication of the Beidou satellite, the baseband chip 31 in FIG. 2 controls the common terminal of the first switch 603 to be conductive with the first gating terminal, and controls the common terminal of the switch 6013 to be conductive with the second gating terminal through the control circuit 6014. The radio frequency signal from the RFIC 32 shown in FIG. 2 enters the filter 608, and then the radio frequency signal is transmitted to the PA 6011 through the switch 6013 and the first capacitor C1. The radio frequency signal is power amplified by the PA 6011. The radio frequency signal is transmitted to the antenna 34 through the coupler 6012, the second capacitor C2, the harmonic suppression network 602, the first switch 603, and is emitted through the antenna 34.

[0137] As shown by the dashed arrows in FIG. 22, when the electronic device receives a radio frequency signal through satellite communication of the Beidou satellite, the baseband chip 31 in FIG. 2 controls the common terminal of the first switch 603 to be conductive with the second gating terminal. The radio frequency signal from the antenna 34 is transmitted to the second LNA 604 through the first switch 603 and the filter 611, and the radio frequency signal is power amplified by the second LNA 604. The radio frequency signal is transmitted to the RFIC 32 shown in FIG. 2 through the filter 610.

[0138] The above-mentioned radio frequency front-end circuit is electrically connected with a single antenna, and the radio frequency front-end circuit can also be electrically connected with double antennas.

[0139] Taking the radio frequency end circuit shown in FIG. 7 as an example, as shown in FIG. 23, on the basis of the radio frequency front end circuit shown in FIG. 7, the radio frequency end circuit further includes a third switch 614, and the third switch 614 is a SPDT switch. The common terminal of the first switch 603 is electrically connected with the common terminal of the third switch 614, the first gating terminal of the third switch 614 is electrically connected with the first antenna 341, and the second gating terminal of the third switch 614 is electrically connected with the second antenna 342. The third switch 614 is controlled by the baseband chip 31 in FIG. 2. When the electronic device performs satellite communication, the baseband chip 31 controls the third switch 614 to conduct the common terminal and the first gating terminal; when the electronic device performs cellular communication, the baseband chip 31 controls the third switch 614 to conduct the common terminal and the second gating terminal. Alternatively, when the electronic device performs one kind of satellite communication, the baseband chip 31 controls the third switch 614 to conduct the common terminal and the first gating terminal; when the electronic device performs another kind of satellite communication, the baseband chip 31 controls the third switch 614 to conduct the common terminal and the second gating terminal.

[0140] Still taking the radio frequency end circuit shown in FIG. 7 as an example, as shown in FIG. 24, the first switch 603 can be a DP4T switch. The first common terminal of the first switch 603 is electrically connected with the first antenna 341, and the second common terminal of the first switch 603 is electrically connected with the second antenna 342. When the electronic device performs satellite communication, the baseband chip 31 controls the first switch 603 to conduct the first common terminal and one of the first gating terminal, the second gating terminal and the third gating terminal; when the electronic device performs cellular communication, the baseband chip 31 controls the first switch 603 to conduct the second common terminal and the fourth gating terminal. Alternatively, when the electronic device performs one kind of satellite communication, the baseband chip 31 controls the first switch 603 to conduct the first common terminal and one of the first gating terminal, the second gating terminal and the third gating terminal; when the electronic device performs another kind of satellite communication, the baseband chip 31 controls the first switch 603 to conduct the first common terminal and any one of the first gating terminal, the second gating terminal and the third gating terminal.

[0141] It should be noted that the connection mode of the first switch 603, the third switch 614, the first antenna 341 and the second antenna 342 in FIG. 23, and the connection mode of the first switch 603 and the first antenna 341 and the second antenna 342 in FIG. 24, can also be applied to other embodiments, for example, applied to FIGS. 7-22.

[0142] Because the satellite communication has high transmitting power and large harmonic energy, a harmonic suppression network needs to be designed according to different satellite communications to suppress the out-of-band spurious signals, which is different from cellular communication. The satellite communication protocol requires that the harmonic spurious amplitude of S-band satellite communication is less than -30dBm / MHz, and the harmonic spurious amplitude of L-band satellite communication is less than -50dBm / 4KHz. Although the PA 6011 in the RF front-end chip 601 can preliminarily suppress the harmonics of the RF signal, the effect is limited. For example, the harmonic spurious amplitude of the PA is -17dBm / 4KHz, and the harmonic suppression network 602 needs to additionally provide more than 33dB (-17+50) harmonic suppression for the L-band.

[0143] As shown in FIG. 25, the embodiment of the application provides a structure of the harmonic suppression network 602, which includes inductance L1, inductance L2, inductance L3, inductance L4, capacitance C1, capacitance C2, capacitance C3, capacitance C4, capacitance C5, capacitance C6, and capacitance C7.

[0144] The first end of the inductance L1 is electrically connected to the first end of the inductance L3 and the first end of the capacitance C2, and the second end of the capacitance C2 is electrically connected to the first end of the inductance L4. The second end of the inductance L2 and the second end of the inductance L3 are grounded. The second end of the inductance L1, the first end of the capacitance C1, the first end of the inductance L2, the first end of the capacitance C3, and the first end of the capacitance C5 are electrically connected, and the second end of the capacitance C1 is grounded. The second end of the inductance L2 is electrically connected to the second end of the capacitance C4 and the second end of the capacitance C6. The second end of the capacitance C3 is electrically connected to the first end of the capacitance C4, the second end of the capacitance C5, the first end of the capacitance C6, and the first end of the capacitance C7 are electrically connected, and the second end of the capacitance C7 is electrically connected.

[0145] The harmonic suppression network 602 can be applied to the radio frequency front-end circuit shown in FIG. 7, which supports three satellite communication modes. The harmonic suppression network 602 can be used to suppress the harmonic of the radio frequency signal in the L band and the S band (1.61 GHz-2.01 GHz) in the satellite communication, and the insertion loss of the radio frequency signal in the L band and the S band is increased by 0.6 dB. For example, L1=4.3nH, L2=3nH, L3=5.6nH, L4=1.5nH, C1=1pF, C2=1pF, C3=2.4pF, C4=0.5pF, C5=0.5pF, C6=0.5pF, and C7=1pF. As shown in FIG. 26A, S1 is the loss of the harmonic suppression network 602 to the radio frequency signal in the L band and the S band (1.61 GHz-2.01 GHz), and S2 is the loss of the harmonic suppression network 602 to the second harmonic of the L band and the S band (main energy source of interference). As can be seen, the loss of the radio frequency signal in the L band and the S band is small, and the second harmonic of the L band and the S band is well suppressed. Due to the error of the capacitance value of the capacitor and the inductance value of the inductor caused by the production process fluctuation, as shown in FIG. 26B, the error of the capacitor and the inductor is introduced on the basis of FIG. 26A, more curves can be drawn, and it can be determined that the maximum suppression degree of the harmonic suppression network 602 to the second harmonic of the L band and the S band is about -35 dB.

[0146] As shown in FIG. 27, the embodiment of the present application provides a structure of the harmonic suppression network 602, which includes an inductor L1, an inductor L2, an inductor L3, an inductor L4, a capacitor C1, a capacitor C2, a capacitor C3, and a capacitor C4.

[0147] The first end of the inductor L1 is electrically connected to the first end of the inductor L3 and the first end of the capacitor C2, and the second end of the capacitor C2 is electrically connected to the first end of the inductor L4. The second end of the inductor L3 and the second end of the inductor L4 are grounded. The second end of the inductor L1, the first end of the capacitor C1, the first end of the inductor L2, and the first end of the capacitor C3 are electrically connected, and the second end of the capacitor C1 is grounded. The second end of the inductor L2 is electrically connected to the second end of the capacitor C4. The second end of the capacitor C3 is electrically connected to the first end of the capacitor C4.

[0148] The harmonic suppression network 602 can be applied to the radio frequency front-end circuit supporting Beidou satellite communication shown in FIG. 13, or can be applied to the radio frequency front-end circuit supporting Beidou satellite communication and Starlink satellite communication shown in FIG. 17. Both Beidou satellite communication and Starlink satellite communication are located in the L frequency band, so the harmonic suppression network 602 can realize harmonic suppression of the radio frequency signal in the L frequency band in satellite communication, and the insertion loss in the L frequency band is only increased by 0.4 dB, and the insertion loss in the S frequency band is increased by 0.8 dB (which actually has no effect on Beidou satellite communication and Starlink satellite communication). For example, L1=4.3nH, L2=3nH, L3=5.6nH, L4=1.3nH, C1=1.5pF, C2=1.5pF, C3=56pF, and C4=0.4pF. As shown in FIG. 28, after introducing the error of the capacitance and inductance, S1 is the loss of the harmonic suppression network 602 to the radio frequency signal in the L frequency band, and S2 is the loss of the harmonic suppression network 602 to the second harmonic of the L frequency band (the main energy source of interference). It can be seen that the loss of the radio frequency signal in the L frequency band is small, and the second harmonic of the L frequency band is well suppressed. By analyzing a plurality of curves, it can be determined that the maximum suppression degree of the harmonic suppression network 602 to the second harmonic of the L frequency band is about -35dB.

[0149] As shown in FIG. 29, the embodiment of the present application provides a structure of a harmonic suppression network 602, which includes an inductor L1, an inductor L2, a capacitor C1, a capacitor C3, and a capacitor C4.

[0150] The first end of the inductor L1 is the first end of the harmonic suppression network 602, the second end of the inductor L1, the first end of the capacitor C1, the first end of the inductor L2, and the first end of the capacitor C3 are electrically connected, and the second end of the capacitor C1 is grounded. The second end of the inductor L2 is the second end of the harmonic suppression network 602 and is electrically connected with the second end of the capacitor C4. The second end of the capacitor C3 is electrically connected with the first end of the capacitor C4. The harmonic suppression network 602 can be applied to the radio frequency front-end circuit supporting Starlink satellite communication or Tianhong satellite communication shown in FIG. 11.

[0151] The satellite communication of Star Network is located in L frequency band, and the harmonic suppression network 602 can realize harmonic suppression of the radio frequency signal in the L frequency band of the satellite communication. The insertion loss of the L frequency band is only increased by 0.2 dB, and the insertion loss of the S frequency band is increased by 0.5 dB (which has no effect on the satellite communication of Star Network). For example, L1 = 3nH, L2 = 3nH, C1 = 1.2pF, C3 = 1.2pF, and C4 = 1pF. As shown in FIG. 30, after introducing the error of the capacitor and the inductor, S1 is the loss of the radio frequency signal in the L frequency band of the harmonic suppression network 602, and S2 is the loss of the second harmonic (main energy source of interference) of the L frequency band of the harmonic suppression network 602. It can be seen that the loss of the radio frequency signal in the L frequency band is small, and the second harmonic of the L frequency band is well suppressed. By analyzing a plurality of curves, it can be determined that the maximum suppression degree of the second harmonic of the L frequency band of the harmonic suppression network 602 is about -36dB.

[0152] The satellite communication of Tian Tong is located in S frequency band, and the harmonic suppression network 602 can realize harmonic suppression of the radio frequency signal in the S frequency band of the satellite communication. The insertion loss of the S frequency band is only increased by 0.3 dB. For example, L1 = 3nH, L2 = 3nH, C1 = 1pF, C3 = 1pF, and C4 = 0.5pF. As shown in FIG. 31, after introducing the error of the capacitor and the inductor, S1 is the loss of the radio frequency signal in the S frequency band of the harmonic suppression network 602, and S2 is the loss of the second harmonic (main energy source of interference) of the S frequency band of the harmonic suppression network 602. It can be seen that the loss of the radio frequency signal in the S frequency band is small, and the second harmonic of the S frequency band is well suppressed. By analyzing a plurality of curves, it can be determined that the maximum suppression degree of the second harmonic of the S frequency band of the harmonic suppression network 602 is about -44dB.

[0153] As shown in FIG. 32, the embodiment of the present application provides a structure of a harmonic suppression network 602, which includes an inductor L1, an inductor L2, an inductor L5, an inductor L6, a capacitor C1, a capacitor C3, a capacitor C4, and a capacitor C7.

[0154] The first end of the inductor L1 is used as the first end of the harmonic suppression network 602. The second end of the inductor L1, the first end of the capacitor C1, the first end of the inductor L2, the first end of the capacitor C3, and the first end of the inductor L5 are electrically connected, and the second end of the capacitor C1 is grounded. The second end of the inductor L2 is used as the second end of the harmonic suppression network 602, and is electrically connected with the second end of the capacitor C4 and the second end of the inductor L6. The second end of the capacitor C3 is electrically connected with the first end of the capacitor C4, the second end of the inductor L5, the first end of the inductor L6, and the first end of the capacitor C7, and the second end of the capacitor C7 is electrically connected. The harmonic suppression network 602 can be applied to the radio frequency front-end circuit shown in FIG. 14, which supports satellite communication of Star Network and satellite communication of Tian Tong.

[0155] The satellite communication of Star Network is located in L frequency band, and the satellite communication of Tian Gong is located in S frequency band. The harmonic suppression network 602 can realize harmonic suppression of the radio frequency signals in S frequency band and L frequency band in satellite communication, and increase the insertion loss of S frequency band by 0.4 dB and the insertion loss of L frequency band by 0.35 dB. For example, L1=3nH, L2=3nH, L5=22nH, L6=2.7nH, C1=1.2pF, C3=1.2pF, C4=1pF, and C7=0.5pF. As shown in FIG. 33, after introducing the error of the capacitance and inductance, S1 is the loss of the harmonic suppression network 602 to the radio frequency signals in S frequency band and L frequency band, S2 is the loss of the harmonic suppression network 602 to the second harmonic (main energy source of interference) of L frequency band and S frequency band, and it can be seen that the loss of the radio frequency signals in S frequency band and L frequency band is small, and the second harmonic of L frequency band and S frequency band is well suppressed. By analyzing a plurality of curves, it can be determined that the maximum suppression degree of the harmonic suppression network 602 to the second harmonic of L frequency band and S frequency band is about -42 dB.

[0156] The radio frequency front-end chip, the radio frequency front-end circuit and the electronic device provided by the embodiment of the present application, the plurality of gating terminals of the switch are electrically connected with the plurality of input pins respectively, each input pin can input a radio frequency signal of a satellite communication mode. The common terminal of the switch is electrically connected with the input terminal of the PA, and the switch is controlled by the control signal input by the control pin, one of the plurality of gating terminals of the switch is turned on with the common terminal, so that one of the plurality of input pins is turned on with the input terminal of the PA, realizing a radio frequency front-end chip integrated with multiple satellite communication modes, which is conducive to the miniaturization of the electronic device.

[0157] The above merely provides the specific implementation of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A radio frequency front-end chip, characterized by The radio frequency front-end chip package has multiple devices and multiple pins; the multiple devices include a power amplifier PA, a coupler, a switch, and a control circuit; the multiple pins include multiple input pins, a control pin, and an antenna pin; Multiple gating terminals of the switch are electrically connected with the multiple input pins, and the multiple input pins are used for inputting radio frequency signals of different satellite communication modes; a control terminal of the switch is electrically connected with the control circuit, the control circuit is electrically connected with the control pin, and the control pin is used for controlling the switch to connect one of the multiple gating terminals with a common terminal of the switch through the control circuit, so as to transmit a radio frequency signal of one of the different satellite communication modes to the PA, and the PA is used for power amplifying the radio frequency signal of the one communication mode; the PA is electrically connected with the coupler, and the coupler is used for transmitting the radio frequency signal of the one communication mode to the antenna pin, and the antenna pin is used for transmitting the radio frequency signal of the one communication mode to an antenna.

2. The radio frequency front-end chip of claim 1, wherein, The multiple pins further include a first power supply pin, a second power supply pin, and a third power supply pin; the PA is further electrically connected with the first power supply pin and the second power supply pin, the first power supply pin is used for supplying power to a driving stage of the PA, and the second power supply pin is used for supplying power to a last stage of the PA; the control circuit is further electrically connected with the third power supply pin, and the third power supply pin is used for supplying power to the control circuit.

3. The radio frequency front-end chip according to claim 1 or 2, wherein, The multiple pins further include a coupling output pin and a detection pin, and a coupling terminal of the coupler is electrically connected with the coupling output pin and the detection pin.

4. The radio frequency front-end chip according to any one of claims 1-3, characterized by, The multiple devices further include a bias circuit, the bias circuit is electrically connected with the PA, the third power supply pin is further used for providing a bias voltage and a bias current for the PA through the bias circuit, and the control pin is further used for controlling the bias voltage output by the bias circuit to the PA through the control circuit.

5. The radio frequency front-end chip according to any one of claims 1-4, characterized by, The multiple devices further include a first capacitor, a common terminal of the switch is electrically connected with a first terminal of the first capacitor, and a second terminal of the first capacitor is electrically connected with an input terminal of the PA.

6. The radio frequency front-end chip according to any one of claims 1-5, wherein, The multiple devices further include a second capacitor, an output terminal of the PA is electrically connected with an input terminal of the coupler, a through terminal of the coupler is electrically connected with a first terminal of the second capacitor, and a second terminal of the second capacitor is electrically connected with the antenna pin.

7. The radio frequency front-end chip according to any one of claims 1-6, characterized by, The multiple pins further include a ground pin, and the ground pin is used for grounding.

8. The radio frequency front-end chip according to any one of claims 1-7, wherein, The multiple input pins include a first input pin, a second input pin, and a third input pin, and the multiple gating terminals of the switch include a first gating terminal, a second gating terminal, and a third gating terminal; The first input pin is electrically connected with the first gating terminal of the switch, the second input pin is electrically connected with the second gating terminal of the switch, and the third input pin is electrically connected with the third gating terminal of the switch.

9. The radio frequency front-end chip according to any one of claims 1-8, characterized by, The control pins include a first control pin and a second control pin, the first control pin and the second control pin being used to control the switch to turn on one of the first gate terminal, the second gate terminal and the third gate terminal with the common terminal by the control circuit.

10. The radio frequency front-end chip according to any one of claims 1-9, characterized by, The package of the radio frequency front-end chip is a quadrilateral, the plurality of input pins are located on a first side of the quadrilateral, the antenna pin and the coupling output pin are located on a third side of the quadrilateral, and the first side is opposite to the third side.

11. The radio frequency front end chip of claim 10, wherein, The control pin, the detection pin and the third power supply pin are located on a fourth side of the quadrilateral.

12. The radio frequency front-end chip according to claim 10 or 11, wherein, The first power supply pin and the second power supply pin are located on a second side of the quadrilateral.

13. The radio frequency front-end chip of any one of claims 10-12, wherein, The remaining pins of the radio frequency front-end chip are all ground pins, and a plurality of ground pins are distributed in the center and four corners of the radio frequency front-end chip.

14. The radio frequency front-end chip of any one of claims 10-13, wherein, The package size of the radio frequency front-end chip is 3.5mm*3.5mm.

15. A radio frequency front-end circuit, characterized by The radio frequency front-end chip includes any one of the radio frequency front-end chips in claims 1-14.

16. The circuit of claim 15, wherein, Further comprising a first filter, a first end of the first filter being an input end of a radio frequency signal, and the plurality of input pins including a first input pin, a second end of the first filter being electrically connected with the first input pin.

17. The circuit of claim 15 or 16, wherein, The first control pin and the second control pin of the radio frequency front-end chip are used to be electrically connected with a baseband chip, the first power supply pin, the second power supply pin and the third power supply pin of the radio frequency front-end chip are used to be electrically connected with a power supply, and the coupling output pin and the detection pin of the radio frequency front-end chip are used to be electrically connected with the baseband chip.

18. The circuit of any of claims 15-17, wherein, Further comprising a harmonic suppression network, a first end of the harmonic suppression network being electrically connected with the antenna pin.

19. The circuit of claim 18, wherein, Further comprising a first switch, a second end of the harmonic suppression network being electrically connected with a first gate terminal of the first switch, and a first common terminal of the first switch being used to be electrically connected with the antenna.

20. The circuit of claim 19, wherein, Further comprising a first low noise amplifier (LNA), a second end of the harmonic suppression network being electrically connected with a first gate terminal of the first switch, a first common terminal of the first switch being used to be electrically connected with the antenna, and a second gate terminal of the first switch being electrically connected with an input end of the first LNA.

21. The circuit of claim 20, wherein, Further comprising a second filter, an output end of the first LNA being electrically connected with a second end of the second filter, and a first end of the second filter being an output end of a radio frequency signal.

22. The circuit of claim 20 or 21, wherein, Further comprising a third filter, a second gate terminal of the first switch being electrically connected with an input end of the first LNA through the third filter.

23. The circuit of any of claims 20-22, wherein, Further comprising a second switch, a fourth filter and a fifth filter, the plurality of input pins including a second input pin. A first end of the fourth filter is an input end of a radio frequency signal, a second end of the fourth filter is electrically connected with the second input pin, an output end of the first LNA is electrically connected with a common terminal of the second switch, a first gate terminal of the second switch is electrically connected with a second end of the second filter, a second gate terminal of the second switch is electrically connected with a second end of the fifth filter, and a first end of the fifth filter is an output end of a radio frequency signal.

24. The circuit of any of claims 19-23, wherein, The fourth filter, the sixth filter, the seventh filter, and the second LNA are further included. The first end of the fourth filter is an input end of the radio frequency signal, the second end of the fourth filter is electrically connected with the second input pin, the third gating end of the first switch is electrically connected with the input end of the second LNA through the sixth filter, the output end of the second LNA is electrically connected with the second end of the seventh filter, and the first end of the seventh filter is an output end of the radio frequency signal.

25. The circuit of claim 24, wherein, The eighth filter is further included, the first end of the eighth filter is an input end of the radio frequency signal, the plurality of input pins further include a third input pin, and the second end of the eighth filter is electrically connected with the third input pin.

26. The circuit of any of claims 19-25, wherein, The third switch is further included, the first common end of the first switch is electrically connected with the common end of the third switch, the first gating end of the third switch is electrically connected with the first antenna, and the second gating end of the third switch is electrically connected with the second antenna.

27. The circuit of any of claims 19-25, wherein, The first common end of the first switch is electrically connected with the first antenna, and the second common end of the first switch is electrically connected with the second antenna.

28. The circuit of any of claims 18-27, wherein, The harmonic suppression network comprises a first inductor, a second inductor, a first capacitor, a third capacitor, and a fourth capacitor; the first end of the first inductor is a first end of the harmonic suppression network, the second end of the first inductor, the first end of the first capacitor, the first end of the second inductor, and the first end of the third capacitor are electrically connected, and the second end of the first capacitor is grounded; the second end of the second inductor is a second end of the harmonic suppression network and is electrically connected with the second end of the fourth capacitor; and the second end of the third capacitor is electrically connected with the first end of the fourth capacitor.

29. The circuit of claim 28, wherein, The harmonic suppression network further comprises a third inductor, a fourth inductor, and a second capacitor; the first end of the first inductor is electrically connected with the first end of the third inductor and the first end of the second capacitor, the second end of the second capacitor is electrically connected with the first end of the fourth inductor, and the second end of the third inductor and the second end of the fourth inductor are grounded.

30. The circuit of claim 29, wherein, The harmonic suppression network further comprises a fifth capacitor, a sixth capacitor, and a seventh capacitor; the first end of the third capacitor is electrically connected with the first end of the fifth capacitor, the second end of the fifth capacitor, the first end of the sixth capacitor, and the first end of the seventh capacitor are electrically connected, the second end of the seventh capacitor is grounded, and the second end of the sixth capacitor is electrically connected with the second end of the fourth capacitor.

31. The circuit of claim 28, wherein, The harmonic suppression network further comprises a fifth inductor, a sixth inductor, and a seventh capacitor; the first end of the second inductor is electrically connected with the first end of the fifth inductor, the second end of the second inductor is electrically connected with the second end of the sixth inductor, the second end of the fifth inductor, the first end of the sixth inductor, and the first end of the seventh capacitor are electrically connected, and the second end of the seventh capacitor is grounded.

32. An electronic device, comprising: The electronic device supports one of the following satellite communication modes: ThunSat communication mode, StarNet satellite communication mode, and Beidou satellite communication mode.

33. The electronic device of claim 32, wherein, The electronic device supports one of the following satellite communication modes: ThunSat communication mode, StarNet satellite communication mode, and Beidou satellite communication mode.

34. The electronic device of claim 32, wherein, The electronic device supports one of the following satellite communication modes: ThunSat communication mode, StarNet satellite communication mode, and Beidou satellite communication mode.

35. The electronic device of claim 32, wherein, The electronic device supports one of the following satellite communication modes: ThunSat communication mode, StarNet satellite communication mode, and Beidou satellite communication mode.

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