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

Abstract

The utility model discloses a radio frequency front-end chip, a radio frequency front-end circuit and electronic equipment, relates to the field of radio frequency, and is used for realizing a radio frequency front end integrating a plurality of satellite communication modes. A plurality of input pins in the radio frequency front-end chip are electrically connected with a plurality of gating ends of the switch respectively; the switch control end is electrically connected with the control circuit, the control circuit is electrically connected with the control pin, the third power supply pin and the bias circuit, the bias circuit is electrically connected with the PA, and the PA is electrically connected with the first power supply pin and the second power supply pin; the common end of the switch is electrically connected with the first end of the first capacitor, the second end of the first capacitor is electrically connected with the PA input end, the PA output end is electrically connected with the input end of the coupler, the straight-through end of the coupler is electrically connected with the first end of the second capacitor, and the coupling end of the coupler is electrically connected with the coupling output pin and the detection pin; the second end of the second capacitor is electrically connected with the antenna pin.

Description

Technical Field

[0001] The present application relates to the field of radio frequency, and in particular to a radio frequency front-end chip, a radio frequency front-end circuit and an electronic device. Background Art

[0002] An increasing number of miniaturized electronic devices (such as mobile phones) support various satellite communication methods, including Beidou, Tiantong, and StarNet. Each satellite communication method requires its own baseband chip, radio frequency integrated circuit (RFIC), and RF front-end chip. The RF front-end chips for these various satellite communication methods occupy a large area on the circuit board, hindering the miniaturization of electronic devices. Utility Model Content

[0003] The embodiments of the present application provide a radio frequency front-end chip, a radio frequency front-end circuit, and an electronic device for realizing a radio frequency front-end chip integrating multiple satellite communication modes, so as to facilitate the miniaturization of the electronic device.

[0004] To achieve the above objectives, the embodiments of the present application adopt the following technical solutions:

[0005] 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 pin, a second power pin, a third power pin, an antenna pin, a coupling output pin, a detection pin, and a ground pin; the plurality of input pins are electrically connected to the plurality of selection terminals of the switch, respectively; the 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 pin and the bias circuit, the bias circuit is electrically connected to the PA, and the PA is electrically connected to the first power pin and the second power pin; the common terminal of the switch is electrically connected to the first terminal of the first capacitor, the second terminal of the first capacitor is electrically connected to the input terminal of the PA, the output terminal of the PA is electrically connected to the input terminal of the coupler, and the through terminal of the coupler is electrically connected to the first terminal of the second capacitor. The first power pin is electrically connected to the PA, the second power pin is electrically connected to the coupling output pin and the detection pin; the second end of the second capacitor is electrically connected to the antenna pin; the multiple input pins are used to input radio frequency signals of different satellite communication modes; the control pin is used to control the switch to connect one of the multiple selection terminals to the common terminal through the control circuit, and to control the bias voltage output by the bias circuit to the PA; the coupling output pin is used to output the coupled radio frequency signal, and the detection pin is used to output a DC signal indicating the power of the PA; the antenna pin is used to be electrically connected to the antenna; the first power pin is used to power the driving stage of the PA, the second power pin is used to power the last stage of the PA, the third power pin is used to power the control circuit and provide a bias voltage and bias current to the PA through the bias circuit, and the ground pin is used for grounding.

[0006] In the RF front-end chip provided in the embodiments of the present application, multiple strobe terminals of a switch are electrically connected to multiple input pins, each of which can receive a RF signal representing a satellite communication method. The common terminal of the switch is electrically connected to the input terminal of a PA. The switch is controlled by a control signal input from a control pin, selecting one of the multiple strobe terminals of the switch to be connected to the common terminal, thereby selecting one of the multiple input pins to be connected to the input terminal of the PA. This implements an RF front-end chip that integrates multiple satellite communication methods, facilitating the miniaturization of electronic devices.

[0007] In one possible implementation, the multiple input pins include a first input pin, a second input pin, and a third input pin, and the multiple select terminals of the switch include a first select terminal, a second select terminal, and a third select terminal. The first input pin is electrically connected to the first select terminal of the switch, the second input pin is electrically connected to the second select terminal of the switch, and the third input pin is electrically connected to the third select terminal of the switch. The multiple input pins may further include more (e.g., four) or fewer (e.g., two) input pins to accommodate input of radio frequency signals of different satellite communication modes.

[0008] In one possible embodiment, the control pin includes a first control pin and a second control pin, and the first control pin and the second control pin are used to control the switch to connect one of the first selection terminal, the second selection terminal, and the third selection terminal to the common terminal through the control circuit. The number of input pins is the same as the number of selection terminals of the switch. As the number of input pins increases, the number of selection 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 selection terminals (and at least two input pins) to be connected to the common terminal, two control pins can control at least four selection terminals (and at least four input pins) to be connected to the common terminal, and so on. K control pins can control at least 2^K selection terminals (and at least 2^K input pins) to be connected to the common terminal. Multiple input pins are located on the same side, and the control pins are located on the same side, which can facilitate the wiring of the RF front-end chip.

[0009] In one possible embodiment, the RF front-end chip is packaged in a quadrilateral shape, with multiple input pins located on the first side of the quadrilateral; antenna pins and coupled output pins are located on the third side of the quadrilateral; the first side and the third side are opposite each other. Having multiple input pins on the same side facilitates routing of the RF front-end chip. The multiple input pins are used to input RF signals, while the antenna pins and coupled output pins are used to output RF signals. Therefore, the first side where the multiple input pins are located is opposite the third side where the antenna pins and coupled output pins are located, preventing interference caused by coupling between them.

[0010] In one possible implementation, the control pin, detection pin, and third power pin are located on the fourth side of the quadrilateral. The control pin and detection pin are both DC signals and are located on the same side, separate from the RF signal, to avoid interference from RF signals. The third power pin and control pin are both electrically connected to the control circuit, so they are also located on the same side to shorten internal wiring distances.

[0011] In one possible implementation, the first power pin and the second power pin are located on the second side of the quadrilateral. Both the first power pin and the second power pin are used to power the PA, so the first power pin and the second power pin are also located on the same side to shorten the internal wiring distance.

[0012] In one possible implementation, the remaining pins of the RF front-end chip are all ground pins, and multiple ground pins are distributed in the center and four corners of the RF front-end chip, which can achieve good grounding of the RF front-end chip and reduce the interference of external signals on the inside of the RF front-end chip.

[0013] In one possible implementation, the RF front-end chip has a package size of 3.5mm*3.5mm. This is smaller than the existing RF front-end chips of Tiantong and Beidou (5mm*5mm and 5mm*4mm, respectively). This saves the area of at least one RF front-end chip when supporting multiple satellite communication modes, making it easier to layout on a circuit board.

[0014] In a second aspect, a radio frequency front-end circuit is provided, comprising the radio frequency 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 end of the first filter is an input end of the radio frequency signal, the second end of the first filter is electrically connected to the first input pin of the radio frequency front-end chip, the first control pin and the second control pin of the radio frequency front-end chip are used to electrically connect to the baseband chip, the first power pin, the second power pin, and the third power pin of the radio frequency front-end chip are used to electrically connect to the power supply, the coupling output pin and the detection pin of the radio frequency front-end chip are used to electrically connect to the baseband chip, and the antenna pin of the radio frequency front-end chip is electrically connected to the first end of the harmonic suppression network; the second end of the harmonic suppression network is electrically connected to the first selection end of the first switch, the first common end of the first switch is used to electrically connect to the antenna, the second selection end of the first switch is electrically connected to the input end of the first LNA, the output end of the first LNA is electrically connected to the second end of the second filter, and the first end of the second filter is an output end of the radio frequency signal. The radio frequency front-end circuit supports a satellite communication mode of Tiantong satellite communication or Xingwang satellite communication.

[0015] In one possible implementation, a third filter is further included, and the second select terminal of the first switch is 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. While adding the third filter to the input terminal of the first LNA increases insertion loss, it can filter out out-of-band clutter signals, thereby improving the sensitivity of the first LNA.

[0016] In one possible embodiment, the system further includes a second switch, a fourth filter, and a fifth filter. The first end of the fourth filter is an input end for RF signals, the second end of the fourth filter is electrically connected to the second input pin of the RF front-end chip, the output end of the first LNA is electrically connected to the common end of the second switch, the first selection end of the second switch is electrically connected to the second end of the second filter, the second selection end of the second switch is electrically connected to the second end of the fifth filter, and the first end of the fifth filter is an output end for RF signals. This RF front-end circuit supports both Tiantong satellite communication and Xingwang satellite communication.

[0017] In one possible embodiment, the system further includes a second switch, a fourth filter, a sixth filter, a seventh filter, and a second LNA. The first end of the fourth filter is an input end for RF signals, the second end of the fourth filter is electrically connected to the second input pin of the RF front-end chip, the third selection end of the first switch is electrically connected to the input end of the first LNA via the sixth filter, the output end of the first LNA is electrically connected to the second end of the seventh filter, and the first end of the seventh filter is an output end for RF signals. The RF front-end circuit supports both Tiantong satellite communication and Beidou satellite communication, or supports both Xingwang satellite communication and Beidou satellite communication.

[0018] In a possible implementation, an eighth filter is further included, wherein a first end of the eighth filter is an input end of the radio frequency signal, and a second end of the eighth filter is electrically connected to the third input pin of the radio frequency front-end chip.

[0019] In one possible implementation, a third switch is further included, wherein the first common terminal of the first switch is electrically connected to the common terminal of the third switch, the first gating terminal of the third switch is electrically connected to the first antenna, and the second gating terminal of the third switch is electrically connected to the second antenna. The RF front-end circuit can be electrically connected to the dual antennas.

[0020] In one possible implementation, the first common terminal of the first switch is electrically connected to the first antenna, and the second common terminal of the first switch is electrically connected to the second antenna. The RF front-end circuit can be electrically connected to dual antennas.

[0021] In one possible embodiment, 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 serves as the 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 serves as the second end of the harmonic suppression network and is electrically connected to the second end of the fourth capacitor; the second end of the third capacitor is electrically connected to the first end of the fourth capacitor. Since satellite communications have high transmission power and large harmonic energy, it is necessary to design corresponding harmonic suppression networks according to different satellite communications to suppress out-of-band spurious signals, which is different from cellular communications. Although the PA in the RF front-end chip can initially suppress the harmonics of the RF signal, its effect is limited, so the harmonic suppression network is required to provide additional harmonic suppression. This harmonic suppression network can be applied to RF front-end circuits that support StarNet satellite communications or Tiantong satellite communications.

[0022] In one possible implementation, the harmonic suppression network further includes: a third inductor, a fourth inductor, and a second capacitor; the first end of the first inductor is electrically connected to 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 to the first end of the fourth inductor; and the second ends of the third inductor and the fourth inductor are grounded. This harmonic suppression network can be applied to a radio frequency front-end circuit supporting Beidou satellite communications, or can be applied to a radio frequency front-end circuit supporting Beidou satellite communications and StarNet satellite communications.

[0023] In one possible implementation, the harmonic suppression network further includes: a fifth capacitor, a sixth capacitor, and a seventh capacitor; the first end of the third capacitor is electrically connected to 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 to the second end of the fourth capacitor. This harmonic suppression network can be applied to a radio frequency front-end circuit supporting three satellite communication modes.

[0024] In one possible implementation, the harmonic suppression network further includes: a fifth inductor, a sixth inductor, and a seventh capacitor; the first end of the second inductor is electrically connected to the first end of the fifth inductor, the second end of the second inductor is electrically connected to 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. This harmonic suppression network can be used in RF front-end circuits supporting StarNet satellite communications and Tiantong satellite communications.

[0025] In a third aspect, an electronic device is provided, comprising 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 embodiment thereof, wherein the baseband chip is electrically connected to the radio frequency integrated circuit and the radio frequency front-end circuit, the radio frequency integrated circuit and the radio frequency front-end circuit are electrically connected, and the radio frequency integrated circuit is electrically connected to the antenna.

[0026] The technical effects of the third aspect refer to the technical effects of the first to second aspects and any of their embodiments, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of the appearance of an electronic device provided in an embodiment of the present application;

[0028] Figure 2 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application;

[0029] Figure 3 A schematic structural diagram of a radio frequency front-end circuit provided in an embodiment of the present application;

[0030] Figure 4 A schematic structural diagram of a radio frequency front-end circuit provided in an embodiment of the present application;

[0031] Figure 5 A schematic diagram of the structure of a radio frequency front-end chip provided in an embodiment of the present application;

[0032] Figure 6 A schematic diagram of a packaging of a radio frequency front-end chip provided in an embodiment of the present application;

[0033] Figure 7 A schematic structural diagram of a radio frequency front-end circuit provided in an embodiment of the present application;

[0034] Figure 8 A schematic diagram of the flow of radio frequency signals provided in an embodiment of the present application;

[0035] Figure 9 A schematic diagram of the flow of radio frequency signals provided in an embodiment of the present application;

[0036] Figure 10 A schematic diagram of the flow of radio frequency signals provided in an embodiment of the present application;

[0037] Figure 11 A schematic structural diagram of a radio frequency front-end circuit provided in an embodiment of the present application;

[0038] Figure 12 A schematic structural diagram of a radio frequency front-end circuit provided in an embodiment of the present application;

[0039] Figure 13 A schematic structural diagram of a radio frequency front-end circuit provided in an embodiment of the present application;

[0040] Figure 14 A schematic structural diagram of a radio frequency front-end circuit provided in an embodiment of the present application;

[0041] Figure 15 A schematic diagram of the flow of radio frequency signals provided in an embodiment of the present application;

[0042] Figure 16 A schematic diagram of the flow of radio frequency signals provided in an embodiment of the present application;

[0043] Figure 17 A schematic structural diagram of a radio frequency front-end circuit provided in an embodiment of the present application;

[0044] Figure 18 A schematic diagram of the flow of radio frequency signals provided in an embodiment of the present application;

[0045] Figure 19 A schematic diagram of the flow of radio frequency signals provided in an embodiment of the present application;

[0046] Figure 20A schematic structural diagram of a radio frequency front-end circuit provided in an embodiment of the present application;

[0047] Figure 21 A schematic diagram of the flow of radio frequency signals provided in an embodiment of the present application;

[0048] Figure 22 A schematic diagram of the flow of radio frequency signals provided in an embodiment of the present application;

[0049] Figure 23 A schematic structural diagram of a radio frequency front-end circuit provided in an embodiment of the present application;

[0050] Figure 24 A schematic structural diagram of a radio frequency front-end circuit provided in an embodiment of the present application;

[0051] Figure 25 A schematic diagram of the structure of a harmonic suppression network provided in an embodiment of the present application;

[0052] Figure 26 A schematic diagram illustrating the harmonic suppression effect of a harmonic suppression network provided in an embodiment of the present application;

[0053] Figure 27 A schematic diagram of the structure of another harmonic suppression network provided in an embodiment of the present application;

[0054] Figure 28 A schematic diagram illustrating the harmonic suppression effect of another harmonic suppression network provided in an embodiment of the present application;

[0055] Figure 29 A schematic diagram of the structure of another harmonic suppression network provided in an embodiment of the present application;

[0056] Figure 30 A schematic diagram illustrating the harmonic suppression effect of another harmonic suppression network provided in an embodiment of the present application;

[0057] Figure 31 A schematic diagram illustrating the harmonic suppression effect of another harmonic suppression network provided in an embodiment of the present application;

[0058] Figure 32 A schematic diagram of the structure of another harmonic suppression network provided in an embodiment of the present application;

[0059] Figure 33 A schematic diagram illustrating the harmonic suppression effect of another harmonic suppression network provided in an embodiment of the present application. DETAILED DESCRIPTION

[0060] First, some concepts involved in this application are described.

[0061] The terms "first", "second", etc. involved in the embodiments of the present application are only used to distinguish features of the same type and cannot be understood as indicating relative importance, quantity, order, etc.

[0062] The terms "exemplary" or "for example" in the embodiments of this application are used to indicate examples, illustrations, or descriptions. Any embodiment or design described in this application as "exemplary" or "for example" should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0063] The terms "coupling" and "connection" involved in the embodiments of this application should be understood in a broad sense. For example, they may refer to a physical direct connection, or an indirect connection achieved through electronic devices, such as a connection achieved through resistors, inductors, capacitors or other electronic devices.

[0064] Tiantong Satellite Communications (abbreviated as ) refers to the communication services that enable voice calls, text message sending, data transmission and related value-added services through the Tiantong-1 satellite.

[0065] BeiDou Satellite Communications (abbreviated as ) refers to the sending and receiving of short messages via Beidou satellites.

[0066] Starnet Satellite Communications (abbreviated as ) 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.

[0067] like Figure 1As shown, an embodiment of the present application provides an electronic device 101, which is an electronic device with wireless communication function. The electronic device can be mobile or fixed. The electronic device can be deployed on land (for example, indoors or outdoors, handheld or vehicle-mounted, etc.), on water (for example, ships, etc.), or in the air (for example, airplanes, balloons, and satellites, etc.). The electronic device can be called user equipment (UE), access terminal, terminal unit, subscriber unit (subscriber unit), terminal 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 laptop computer, a smart bracelet, a smart screen, a smart watch, a virtual reality (VR) device, an augmented reality (AR) device, a terminal in industrial control, a terminal in self-driving, a terminal in remote medical, a terminal in a smart grid, a terminal in transportation safety, a terminal in a smart city, a terminal in a 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.

[0068] like Figure 1 As shown in Figure A, the electronic device 101 may include a front camera 2931 and a display screen 294. Figure 1 As shown in Figure B, the electronic device 101 may include a rear camera 2932. The front camera 2931 and the rear camera 2932 are used to capture static images or dynamic videos (collectively referred to as images). The display screen 294 is used to display images or receive user touch operations.

[0069] Electronic devices can perform cellular communications (such as 2G / 3G / 4G / 5G communications) and satellite communications (such as Beidou satellite communications, Tiantong satellite communications, and StarNet satellite communications). Satellite communication modules are independent of cellular communication modules. Compared to cellular communications, satellite communications require much greater power. For example, the power required for power level 2 of 4G or 5G is 26dBm, the power required for 2G low-frequency band is 33dBm, and the power required for satellite communications is as high as 35dBm or more. The RF front-end chip for cellular communications uses the RF front-end mobile industry processor interface (RFFE MIPI) protocol to control the components in the RF front-end chip. However, the RF front-end chip for satellite communications does not support the RFFE MIPI protocol, so the RF front-end chip for cellular communications cannot be used for satellite communications.

[0070] Various satellite communication modules have independent baseband chips, RFICs, and RF front-end chips. For example, the Tiantong satellite communication module uses Tiantong's baseband chip, RFIC, and RF front-end chip; the Beidou satellite communication module uses Beidou's baseband chip, RFIC, and RF front-end chip; and the Starnet satellite communication module uses Starnet's baseband chip, RFIC, and RF front-end chip. Conventional technology currently uses Tiantong's RF front-end chip in a 5mm*5mm package, while Beidou's RF front-end chip has a 5mm*4mm package size.

[0071] like Figure 2 As shown, the electronic device includes a processor 210 and a satellite communication module 30. The satellite communication module 30 may 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 may also be integrated with the processor 210 in a SoC.

[0072] The baseband chip 31 is used to convert data from the processor 210 into baseband signals, including performing modulation and demodulation, digital filtering, and equalization on the baseband signals. The baseband chip 31 is also used to control the various switches in the RF front-end circuit 33. The RFIC 32 is used to convert the baseband signals from the baseband chip 31 into RF signals, which are then amplified by the RF front-end circuit 33 and transmitted from the antenna 34. The RF front-end circuit 33 can also amplify the RF signals received from the antenna 34 and transmit them to the RFIC 32. The RFIC 32 converts the RF signals into baseband signals and transmits them to the baseband chip 31. The baseband chip 31 then converts the baseband signals into data and transmits them to the processor 210.

[0073] like Figure 3 and Figure 4 As shown, in the prior art, for an electronic device including multiple satellite communication modules, the RF front-end circuit 33 includes: a first RF front-end chip 401, a first low noise amplifier (LNA) 402, a first switch 403, a filter 404, a filter 405, a second RF front-end chip 411, a second LNA 412, a second switch 413, a filter 414, a filter 415, and a filter 416. The first RF front-end chip 401 includes a first power amplifier (PA) 4011 and a coupler 4012. The second RF front-end chip 411 includes a second PA 4111. The first RF front-end chip 401 and the first LNA 402 are used for Tiantong satellite communication, while the second RF 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.

[0074] The LNA and PA involved in the embodiments of the present application are used to power amplify radio frequency signals. The LNA has a very low noise figure and is suitable for power amplifying weak received radio frequency signals, and the PA is suitable for power amplifying 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 of 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 it through the coupling end. When electrically connected to the PA, it can be used for closed-loop power control of the PA.

[0075] like Figure 3 As shown, two satellite communications and cellular communications share the same antenna. The first end of the filter 404 is the input end of the RF signal, which is used to Figure 2 The RFIC 32 in the filter 404 is electrically connected, the second end of the filter 404 is electrically connected to the input end of the first PA 4011, the output end of the first PA 4011 is electrically connected to the input end of the coupler 4012, and the coupling end of the coupler 4012 is used to connect to the Figure 2 The baseband chip 31 is electrically connected to the baseband chip 31, the through end of the coupler 4012 is electrically connected to the first selection end of the first switch 403, the common end of the first switch 403 is electrically connected to the first antenna 341, the second selection end of the first switch 403 is electrically connected to the common end of the second switch 413, the third selection end of the first switch 403 is electrically connected to the input end of the first LNA 402, the output end of the first LNA 402 is electrically connected to the second end of the filter 405, and the first end of the filter 405 is used to connect to the first antenna 341. Figure 2The first terminal of the filter 414 is the input terminal of the radio frequency signal and is used to connect to the cellular communication module. Figure 2 The RFIC 32 in the embodiment is electrically connected, the second end of the filter 414 is electrically connected to the input end of the second PA 4111, the output end of the second PA 4111 is electrically connected to the first selection end of the second switch 413, the third selection end of the second switch 413 is electrically connected to the second end of the filter 416, the first end of the filter 416 is electrically connected to the input end of the second LNA 412, the output end of the second LNA 412 is electrically connected to the second end of the filter 415, and the first end of the filter 415 is used to connect to the Figure 2 The fourth selection end of the first switch 403 is electrically connected to the RFIC 32 in the cellular communication module.

[0076] Figure 4 and Figure 3 The difference is, Figure 4 The two satellite communications use independent antennas, and each satellite communication can share an antenna with the cellular communication. The second selection end of the first switch 403 is left floating, and the common end of the second switch 413 is electrically connected to the second antenna 342. For other contents, refer to Figure 3 The description is not repeated here.

[0077] Figure 3 and Figure 4 The working principle of the RF front-end circuit shown is as follows:

[0078] When electronic devices transmit radio frequency signals via Tiantong satellite communications, Figure 2 The baseband chip 31 in the first switch 403 controls the common terminal and the first selection terminal to be turned on. Figure 2 The RF signal of the RFIC 32 shown enters the filter 404, and then the RF signal is amplified by the first PA 4011, transmitted to the first antenna 341 through the first switch 403, and transmitted through the first antenna 341. When the electronic device receives the RF signal through the Tiantong satellite communication, Figure 2 The baseband chip 31 controls the common end of the first switch 403 and the third selection end to be turned on, and 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 then transmitted to the first LNA 402 through the filter 405. Figure 2 RFIC 32 is shown.

[0079] When electronic devices transmit radio frequency signals via BeiDou satellite communications, Figure 2 Baseband chip 31 control Figure 3 The common terminal of the first switch 403 is connected to the second gate terminal, and the common terminal of the second switch 413 is controlled to be connected to the first gate terminal. Figure 2 The RF signal of the RFIC 32 shown enters the filter 414, and then the RF signal is amplified by the second PA 4111, transmitted to the first antenna 341 through the second switch 413 and the first switch 403, and transmitted through the first antenna 341. Or, Figure 2 Baseband chip 31 control Figure 4 The common terminal of the second switch 413 is connected to the first selection terminal, and the Figure 2 The radio frequency signal of the RFIC 32 shown 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 .

[0080] When electronic devices receive radio frequency signals through BeiDou satellite communications, Figure 2 Baseband chip 31 control Figure 3 The common terminal of the first switch 403 is connected to the second gate terminal, and the common terminal of the second switch 413 is controlled to be connected to the third gate terminal. The RF signal from the first antenna 341 is transmitted to the filter 416 through the first switch 403 and the second switch 413, and is transmitted to the second LNA 412 through the filter 416 for power amplification, and then transmitted to the filter 415. Figure 2 RFIC 32 shown. Alternatively, Figure 2 Baseband chip 31 control Figure 4 The common terminal of the second switch 413 is connected to the third selection terminal, and the RF signal from the second antenna 342 is transmitted to the filter 416 through the second switch 413, and is transmitted to the second LNA 412 through the filter 416 for power amplification, and then transmitted to the filter 415 through the filter 415. Figure 2 RFIC 32 is shown.

[0081] for Figure 3 For the RF front-end circuit shown in the figure, since the RF link margin of Tiantong satellite communication is more limited and the requirements for transmission power and receiving sensitivity are higher, the transmission and reception of Tiantong satellite communication only go through one-stage switching. The RF link margin of Beidou satellite communication is more sufficient, so the transmission and reception of Beidou satellite communication go through two-stage switching. Figure 3 The RF front-end circuit shown is relative to Figure 4 The RF front-end circuit shown will still lead to a degradation in the transmission and reception performance of Beidou satellite communications.

[0082] In some cases, the same electronic device has multiple versions, some supporting Tiantong satellite communications, some supporting Beidou satellite communications, and some supporting both. If multiple versions use the same circuit board, even if some versions only support Tiantong satellite communications, space for Beidou satellite communications' RF components must be reserved, increasing the circuit board area. Furthermore, supporting both Tiantong and Beidou satellite communications requires more RF components, increasing costs.

[0083] To this end, the present application provides another RF front-end chip and RF front-end circuit. In the RF front-end chip, the RF signal of one satellite communication mode among multiple satellite communications (such as Tiantong, Beidou, and Star Network) is input into the PA through a switch, and the PA performs power amplification on the RF signal. There is no need to use an RF front-end chip for each satellite communication, thereby reducing the number of RF front-end chips.

[0084] like Figure 5 As shown, the RF 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. Figure 5 and Figure 6 As shown, the RF front-end chip 601 further includes a plurality of input pins, a control pin, a first power pin VCC1, a second power pin VCC2, a third power pin VBATT, an antenna pin ANT, a coupled output pin CPL OUT, and a detection pin VDET. Figure 6 As shown, the RF front-end chip 601 also includes multiple ground pins GND for grounding. Exemplarily, 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 may also include more (e.g., four) or fewer (e.g., two) input pins to accommodate input of RF signals for different types of satellite communication methods.

[0085] Multiple input pins are electrically connected to multiple selection 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 to the second terminal of the switch 6013, the second input pin TX IN2 is electrically connected to the second selection terminal of the switch 6013, and the third input pin TX IN3 is electrically connected to the third selection 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 communicate with the Figure 2 The RFIC32 shown is electrically connected to input radio frequency signals of different satellite communications. Figure 7In the figure, the first RF signal input by the first input pin TX IN1 is the RF signal of Tiantong satellite communication, the second RF signal input by the second input pin TX IN2 is the RF signal of Beidou satellite communication, and the third RF signal input by the third input pin TX IN3 is the RF signal of Xingwang satellite communication.

[0086] It should be noted that the number of input pins is the same as the number of the switch's gate terminals. As the number of input pins increases, the number of the switch's gate terminals increases, and the number of control pins can also increase accordingly. For example, one control pin can control at least two gate terminals (and at least two input pins) to be connected to the common terminal, two control pins can control at least four gate terminals (and at least four input pins) to be connected to the common terminal, and so on. K control pins can control at least 2^K gate terminals (and at least 2^K input pins) to be connected to the common terminal.

[0087] The control end of the switch 6013 is electrically connected to the control circuit 6014, and the control circuit 6014 is connected to the control pin (for example, the first control pin CTL1 and the second control pin CTL2) via the control pin. Figure 2 The baseband chip 31 shown in FIG is electrically connected, the control circuit 6014 is electrically connected to the power supply via the third power pin VBATT, the control circuit 6014 is also electrically connected to the bias circuit 6015, the bias circuit 6015 is electrically connected to the PA 6011, and the PA 6011 is also electrically connected to the power supply via the first power pin VCC1 and the second power pin VCC2. The common terminal of the switch 6013 is electrically connected to the first end of the first capacitor C1, the second end of the first capacitor C1 is electrically connected to the input end of the PA 6011, the output end of the PA 6011 is electrically connected to the input end of the coupler 6012, the through terminal of the coupler 6012 is electrically connected to the first end of the second capacitor C2, and the coupling end of the coupler 6012 is electrically connected to the output pin CPL OUT and the detection pin VDET. Figure 2 The second end of the second capacitor C2 is electrically connected to the antenna pin ANT, and the antenna pin ANT is used to be electrically connected to the antenna.

[0088] It should be noted that, unless otherwise specified, the first port of the switch involved in this application is the common port, and all ports of the switch other than the control port are strobe ports. Any of the strobe ports can be electrically connected to the common port, and the names of the various strobe ports of the switch are interchangeable without affecting the scope of protection of the embodiments of this application. For example, a device electrically connected to the first strobe port of the switch can be replaced by the device electrically connected to the second strobe port of the switch.

[0089] Figure 6The package size of the RF front-end chip 601 is 3.5mm*3.5mm, which is smaller than the size of the RF front-end chips of the existing Zhongtiantong and Beidou technologies (5mm*5m and 5mm*4mm respectively). When supporting multiple satellite communication modes, it saves the area of at least one RF front-end chip and is easier to layout on the circuit board. Figure 5 The middle switch 6013 is a single pole double throw (SP3T) switch, which is used to connect one of the first selection terminal, the second selection terminal, and the third selection terminal to the common terminal. Figure 5 The PA 6011 can power amplify the RF signals in the L-band and S-band (1.61GHz to 2.01GHz) of satellite communications. Among them, Beidou satellite communication is located at 1.61 to 1.6265GHz, Starnet satellite communication is biased at 1.668 to 1.675GHz, and Tiantong satellite communication is located at 1.98 to 2.01GHz. Figure 5 The first capacitor C1 and the second capacitor C2 are used to isolate direct current.

[0090] like Figure 6 As shown, the package of the RF front-end chip 601 is a quadrilateral (e.g., a rectangle or square) with 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 it. Multiple input pins, such as the first input pin TX IN1 (pin number 7), the second input pin TX IN2 (pin number 8), the third input pin TX IN3 (pin number 9), and the ground pin (pin number 10), are located on the first side of the quadrilateral. The first power pin VCC1 (pin number 12), the second power pin VCC2 (pin number 14), and two ground pins GND (pin numbers 13 / 15) are located on the second side. The antenna pin ANT (pin number 20), the coupled output pin CPLOUT (pin number 18), and two ground pins (pin numbers 17 / 19) are located on the third side. The four ground pins GND (pins 1 / 6 / 11 / 16) are located at the four corners. The first control pin CTL1 (pin 3), the second control pin CTL2 (pin 4), the detection pin VDET (pin 2), and the third power pin VBATT (pin 5) are located on the fourth side of the quadrilateral.

[0091] Multiple input pins are located on the same side, which facilitates the routing of the RF front-end chip 601. The multiple input pins are used to input RF signals, while the antenna pin ANT and the coupled output pin CPL OUT are used to output RF signals. Therefore, the first side where the multiple input pins are located is opposite the third side where the antenna pin ANT and the coupled output pin CPL OUT are located, avoiding interference caused by coupling between them.

[0092] The control pin and the detection pin VDET are both DC signals, located on the same side and not on the same side as the RF signal to avoid interference from the RF signal. The third power pin VBATT and the control pin are both electrically connected to the control circuit, so the third power pin VBATT and the control pin are also located on the same side to shorten the internal wiring distance. The first power pin VCC1 and the second power pin VCC2 are both used to power the PA, so the first power pin VCC1 and the second power pin VCC2 are also located on the same side to shorten the internal wiring distance. The remaining pins are all ground pins, and multiple ground pins GND are distributed in the center and four corners of the RF front-end chip 601, which can achieve good grounding of the RF front-end chip 601 and reduce the interference of external signals on the inside of the RF front-end chip 601.

[0093] Figure 5 and Figure 6 The functions of the various pins and other components of the RF front-end chip 601 are shown in Table 1. The first control pin CTL1 and the second control pin CTL2 are controlled by Figure 2 Table 2 shows the control logic for the first control pin CTL1 and the second control pin CTL2 of the baseband chip 31. Since Tiantong and Xingwang satellite communications require high RF signal gain, when the first input pin TX IN1 or the third input pin TX IN3 is turned on, the attenuation of the path between the first and third input pins TX IN1 and TX IN3 and switch 6013 must be low, and the PA gain must be high. Since Beidou satellite communications require low RF signal gain, when the second input pin TX IN2 is turned on, the attenuation of the path between the second input pin TX IN2 and switch 6013 can be high, and the PA gain can be low. The attenuation of this path can be T-type attenuation, π-type attenuation, or resistance. It should be noted that Tables 1 and 2 are examples only and are not intended to be limiting.

[0094] Table 1

[0095]

[0096]

[0097] Table 2

[0098]

[0099] The embodiment of the present application provides a radio frequency front-end circuit that can be applied to three satellite communication scenarios (Tiantong, Beidou, and Xingwang). Figure 7As shown, the RF front-end circuit includes an RF 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 a single pole double throw (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 selection port) and become SP3T. The RF front-end chip 601, the first switch 603, and the second switch 606 involved in the implementation of this application are all controlled by Figure 2 Baseband chip 31.

[0100] The first end of the filter 607 is the input end of the first RF signal, which is used to Figure 2 The first end of the filter 608 is the input end of the second RF signal, and is used to connect to the RFIC 32 in the RF front-end chip 601. Figure 2 The first end of the filter 609 is the input end of the third RF signal, and is used to connect to the RFIC 32 in the RF front-end chip 601. Figure 2 The first control pin CTL1 and the second control pin CTL2 of the RF front-end chip 601 are used to communicate with the RFIC 32 in the RF front-end chip 601. Figure 2 The baseband chip 31 shown in FIG is electrically connected to the third power pin VBATT, the first power pin VCC1 and the second power pin VCC2 are used to be electrically connected to the power supply. The coupling output pin CPL OUT and the detection pin VDET of the RF front-end chip 601 are used to be electrically connected to the power supply. Figure 2 The baseband chip 31 shown in FIG is electrically connected. The antenna pin ANT of the RF front-end chip 601 is electrically connected to the first end of the harmonic suppression network 602. The second end of the harmonic suppression network 602 is electrically connected to the second end of the first switch 603. The common end of the first switch 403 is electrically connected to the antenna 34. The second selection end of the first switch 603 is electrically connected to the second end of the filter 611. The first end of the filter 611 is electrically connected to the input end of the second LNA 604. The output end of the second LNA 604 is electrically connected to the second end of the filter 610. The first end of the filter 610 is the output end of the second RF signal, which is used to communicate with the first end of the filter 610. Figure 2The third selection terminal of the first switch 603 is electrically connected to the input terminal of the first LNA 605, the output terminal of the first LNA 605 is electrically connected to the common terminal of the second switch 606, the first selection terminal of the second switch 606 is electrically connected to the second terminal of the filter 612, and the first terminal of the filter 612 is the output terminal of the first RF signal for communicating with the first RF signal. Figure 2 The RFIC 32 in the second switch 606 is electrically connected to the second end of the filter 613, and the first end of the filter 613 is the output end of the third RF signal for communicating with the RFIC 32 in the second switch 606. Figure 2 The fourth selection end of the first switch 603 is electrically connected to the RFIC 32 in the cellular communication module.

[0101] like Figure 8 As shown by the solid arrow in the middle, when electronic equipment transmits radio frequency signals through Tiantong satellite communication, Figure 2 The baseband chip 31 controls the common end of the first switch 603 to be connected to the first gate end, and controls the common end of the switch 6013 to be connected to the first gate end through the control circuit 6014. Figure 2 The RF signal of the RFIC 32 shown enters the filter 607, and then the RF signal is transmitted to the PA 6011 through the switch 6013 and the first capacitor C1. The PA 6011 amplifies the power of the RF signal. The RF 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.

[0102] like Figure 8 As shown by the dotted arrow in the middle, when the electronic device receives the radio frequency signal through the Tiantong satellite communication, Figure 2 The baseband chip 31 controls the common end of the first switch 603 to be connected to the third gate end, and controls the common end of the second switch 606 to be connected to the first gate end. The RF signal from the antenna 34 is transmitted to the first LNA 605 through the first switch 603. The first LNA 605 amplifies the RF signal. The RF signal is transmitted to the first LNA 605 through the second switch 606 and the filter 612. Figure 2 RFIC 32 is shown.

[0103] like Figure 9 As shown by the solid arrow in the middle, when electronic equipment transmits radio frequency signals through BeiDou satellite communication, Figure 2 The baseband chip 31 controls the common terminal of the first switch 603 to be connected to the first gate terminal, and controls the common terminal of the switch 6013 to be connected to the second gate terminal through the control circuit 6014. Figure 2The RF signal of the RFIC 32 shown enters the filter 608, and then the RF signal is transmitted to the PA 6011 through the switch 6013 and the first capacitor C1. The PA 6011 amplifies the power of the RF signal, and the RF 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.

[0104] like Figure 9 As shown by the dotted arrow in the middle, when an electronic device receives a radio frequency signal through BeiDou satellite communication, Figure 2 The baseband chip 31 in the embodiment controls the common terminal of the first switch 603 to be connected with the second selection terminal, and 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 amplifies the radio frequency signal and transmits the radio frequency signal to the second LNA 604 through the filter 610. Figure 2 RFIC 32 is shown.

[0105] like Figure 10 As shown by the solid arrow in the middle, when electronic equipment transmits radio frequency signals through StarNet satellite communication, Figure 2 The baseband chip 31 controls the common terminal of the first switch 603 to be connected to the first gate terminal, and controls the common terminal of the switch 6013 to be connected to the second gate terminal through the control circuit 6014. Figure 2 The RF signal of the RFIC 32 shown enters the filter 609, and then the RF signal is transmitted to the PA6011 through the switch 6013 and the first capacitor C1. The PA6011 amplifies the power of the RF signal. The RF 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.

[0106] like Figure 10 As shown by the dotted arrow in the middle, when the electronic device receives the radio frequency signal through the StarNet satellite communication, Figure 2 The baseband chip 31 controls the common end of the first switch 603 to be connected to the third gate end, and controls the common end of the second switch 606 to be electrically connected to the second gate end. The radio frequency signal from the antenna 34 is transmitted to the first LNA 605 through the first switch 603, and the first LNA 605 amplifies the radio frequency signal. The radio frequency signal is transmitted to the first LNA 605 through the second switch 606 and the filter 613. Figure 2 RFIC 32 is shown.

[0107] It should be noted that the signal-to-noise ratio (SNR) of the Beidou satellite communication downlink is sufficiently high. Although adding a filter (filter 611) to the LNA input will increase insertion loss, it can filter out out-of-band clutter signals, thereby preventing the LNA from being affected by out-of-band interference signals. The SNR of the Tiantong satellite communication and Starnet satellite communication downlinks is not high enough. Adding a filter will result in an even lower SNR, reducing receiver sensitivity and causing signal connection problems. Therefore, adding a filter to the LNA input is not convenient.

[0108] In addition to the scenarios described above where three satellite communication methods are supported, some electronic devices may support fewer satellite communication methods to reduce costs. For example, an embodiment of the present application provides a radio frequency front-end circuit that can be used in scenarios where an electronic device supports only one satellite communication method. This eliminates the need to reserve a separate set of radio frequency front-end chips on the circuit board, saving circuit board area. Figure 11 The RF front-end circuit shown can be used for Tiantong satellite communications. Figure 12 The RF front-end circuit shown can be used for StarNet satellite communications. Figure 13 The RF front-end circuit shown can be used for Beidou satellite communication.

[0109] like Figure 11 As shown, the RF front-end circuit includes an RF front-end chip 601, a harmonic suppression network 602, a first switch 603, a first LNA 605, a filter 607, and a filter 612. 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 selection port) and become an SP3T or SPDT switch.

[0110] The first end of the filter 607 is the input end of the radio frequency signal, which is used to Figure 2 The first control pin CTL1 and the second control pin CTL2 of the RF front-end chip 601 are used to communicate with the RFIC 32 in the RF front-end chip 601. Figure 2 The baseband chip 31 shown in FIG is electrically connected to the third power pin VBATT, the first power pin VCC1 and the second power pin VCC2 are used to be electrically connected to the power supply. The coupling output pin CPL OUT and the detection pin VDET of the RF front-end chip 601 are used to be electrically connected to the power supply. Figure 2The baseband chip 31 shown in FIG is electrically connected. The antenna pin ANT of the RF front-end chip 601 is electrically connected to the first end of the harmonic suppression network 602. The second end of the harmonic suppression network 602 is electrically connected to the second end of the first switch 603, and the common end of the first switch 403 is electrically connected to the antenna 34. The third selection end of the first switch 603 is electrically connected to the input end of the first LNA 605, and the output end of the first LNA 605 is electrically connected to the second end of the filter 612. The first end of the filter 612 is the output end of the RF signal, which is used to communicate with the first LNA 605. Figure 2 The fourth gate terminal of the first switch 603 is used to be electrically connected to the cellular communication module.

[0111] When an electronic device transmits a radio frequency signal, Figure 2 The baseband chip 31 controls the common end of the first switch 603 to be connected to the first gate end, and controls the common end of the switch 6013 to be connected to the first gate end through the control circuit 6014. Figure 2 The RF signal of the RFIC 32 shown enters the filter 607, and then the RF signal is transmitted to the PA6011 through the switch 6013 and the first capacitor C1. The PA6011 amplifies the power of the RF signal. The RF 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.

[0112] When an electronic device receives a radio frequency signal, Figure 2 The baseband chip 31 controls the common end of the first switch 603 and the third selection end to be turned on, and the radio frequency signal from the antenna 34 is transmitted to the first LNA 605 through the first switch 603. The first LNA 605 amplifies the radio frequency signal and transmits the radio frequency signal to the first LNA 605 through the filter 612. Figure 2 RFIC 32 is shown.

[0113] like Figure 12 As shown, the RF front-end circuit includes an RF front-end chip 601, a harmonic suppression network 602, a first switch 603, a first LNA 605, a filter 609, and a filter 612. 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 selection port) and become an SP3T or SPDT switch.

[0114] The first end of the filter 609 is the input end of the radio frequency signal, which is used to Figure 2 The first control pin CTL1 and the second control pin CTL2 of the RF front-end chip 601 are used to connect to the RFIC 32 in the RF front-end chip 601. Figure 2 The baseband chip 31 shown in FIG is electrically connected to the third power pin VBATT, the first power pin VCC1 and the second power pin VCC2 are used to be electrically connected to the power supply. The coupling output pin CPL OUT and the detection pin VDET of the RF front-end chip 601 are used to be electrically connected to the power supply. Figure 2 The baseband chip 31 shown in FIG is electrically connected. The antenna pin ANT of the RF front-end chip 601 is electrically connected to the first end of the harmonic suppression network 602. The second end of the harmonic suppression network 602 is electrically connected to the second end of the first switch 603, and the common end of the first switch 403 is electrically connected to the antenna 34. The third selection end of the first switch 603 is electrically connected to the input end of the first LNA 605, and the output end of the first LNA 605 is electrically connected to the second end of the filter 612. The first end of the filter 612 is the output end of the RF signal, which is used to communicate with the first LNA 605. Figure 2 The fourth gate terminal of the first switch 603 is used to be electrically connected to the cellular communication module.

[0115] When an electronic device transmits a radio frequency signal, Figure 2 The baseband chip 31 controls the common terminal of the first switch 603 to be connected to the first gate terminal, and controls the common terminal of the switch 6013 to be connected to the third gate terminal through the control circuit 6014. Figure 2 The RF signal of the RFIC 32 shown enters the filter 609, and then the RF signal is transmitted to the PA6011 through the switch 6013 and the first capacitor C1. The PA6011 amplifies the power of the RF signal. The RF 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.

[0116] When an electronic device receives a radio frequency signal, Figure 2 The baseband chip 31 controls the common terminal of the first switch 603 to be connected to the third selection terminal, and the radio frequency signal from the antenna 34 is transmitted to the first LNA 605 through the first switch 603. The first LNA 605 amplifies the radio frequency signal and transmits the radio frequency signal to the first LNA 605 through the filter 612. Figure 2 RFIC 32 is shown.

[0117] like Figure 13 As shown, the RF front-end circuit includes an RF 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 selection port) and become an SP3T or SPDT switch.

[0118] The first end of the filter 608 is the input end of the radio frequency signal, which is used to Figure 2 The first control pin CTL1 and the second control pin CTL2 of the RF front-end chip 601 are used to communicate with the RFIC 32 in the RF front-end chip 601. Figure 2 The baseband chip 31 shown in FIG is electrically connected to the third power pin VBATT, the first power pin VCC1 and the second power pin VCC2 are used to be electrically connected to the power supply. The coupling output pin CPL OUT and the detection pin VDET of the RF front-end chip 601 are used to be electrically connected to the power supply. Figure 2 The baseband chip 31 shown in FIG is electrically connected. The antenna pin ANT of the RF front-end chip 601 is electrically connected to the first end of the harmonic suppression network 602. The second end of the harmonic suppression network 602 is electrically connected to the second end of the first switch 603, and the common end of the first switch 403 is electrically connected to the antenna 34. The second selection end of the first switch 603 is electrically connected to the second end of the filter 611, and the first end of the filter 611 is electrically connected to the input end of the second LNA 604. The output end of the second LNA 604 is electrically connected to the second end of the filter 610, and the first end of the filter 610 is the output end of the RF signal, which is used to communicate with the first LNA 604. Figure 2 The fourth gate terminal of the first switch 603 is used to be electrically connected to the cellular communication module.

[0119] When an electronic device transmits a radio frequency signal, Figure 2 The baseband chip 31 controls the common terminal of the first switch 603 to be connected to the first gate terminal, and controls the common terminal of the switch 6013 to be connected to the second gate terminal through the control circuit 6014. Figure 2 The RF signal of the RFIC 32 shown enters the filter 608, and then the RF signal is transmitted to the PA 6011 through the switch 6013 and the first capacitor C1. The PA 6011 amplifies the power of the RF signal, and the RF 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.

[0120] When an electronic device receives a radio frequency signal, Figure 2 The baseband chip 31 in the embodiment controls the common terminal of the first switch 603 and the second selection terminal to be turned on, and 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 amplifies the radio frequency signal and transmits the radio frequency signal to the second LNA 604 through the filter 610. Figure 2 RFIC32 shown.

[0121] The embodiment of the present application provides a radio frequency front-end circuit that can be applied to scenarios where electronic equipment supports two satellite communication modes, namely, Tiantong satellite communication and Xingwang satellite communication. Figure 14 As shown, the RF front-end circuit includes an RF 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 selection port) and become an SP3T or SPDT switch.

[0122] The first end of the filter 607 is the input end of the radio frequency signal, which is used to Figure 2 The first end of the filter 609 is the input end of the RF signal, and is used to communicate with the first input pin TX IN1 of the RF front-end chip 601. Figure 2 The first control pin CTL1 and the second control pin CTL2 of the RF front-end chip 601 are used to connect to the RFIC 32 in the RF front-end chip 601. Figure 2 The baseband chip 31 shown in FIG is electrically connected to the third power pin VBATT, the first power pin VCC1 and the second power pin VCC2 are used to be electrically connected to the power supply. The coupling output pin CPL OUT and the detection pin VDET of the RF front-end chip 601 are used to be electrically connected to the power supply. Figure 2 The baseband chip 31 shown in FIG is electrically connected. The antenna pin ANT of the RF front-end chip 601 is electrically connected to the first end of the harmonic suppression network 602. The second end of the harmonic suppression network 602 is electrically connected to the second end of the first switch 603. The common end of the first switch 403 is electrically connected to the antenna 34. The third selection end of the first switch 603 is electrically connected to the input end of the first LNA 605. The output end of the first LNA 605 is electrically connected to the common end of the second switch 606. The first selection end of the second switch 606 is electrically connected to the second end of the filter 612. The first end of the filter 612 is the output end of the RF signal, which is used to Figure 2 The second gate terminal of the second switch 606 is electrically connected to the second terminal of the filter 613. The first terminal of the filter 613 is the output terminal of the radio frequency signal and is used to Figure 2 The fourth selection end of the first switch 603 is electrically connected to the RFIC 32 in the cellular communication module.

[0123] like Figure 15As shown by the solid arrow in the middle, when electronic equipment transmits radio frequency signals through Tiantong satellite communication, Figure 2 The baseband chip 31 controls the common end of the first switch 603 to be connected to the first gate end, and controls the common end of the switch 6013 to be connected to the first gate end through the control circuit 6014. Figure 2 The RF signal of the RFIC 32 shown enters the filter 607, and then the RF signal is transmitted to the PA 6011 through the switch 6013 and the first capacitor C1. The PA 6011 amplifies the power of the RF signal, and the RF 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.

[0124] like Figure 15 As shown by the dotted arrow in the middle, when the electronic device receives the radio frequency signal through the Tiantong satellite communication, Figure 2 The baseband chip 31 controls the common end of the first switch 603 to be connected to the third gate end, and controls the common end of the second switch 606 to be connected to the first gate end. The RF signal from the antenna 34 is transmitted to the first LNA 605 through the first switch 603. The first LNA 605 amplifies the RF signal. The RF signal is transmitted to the second switch 606 and the filter 612. Figure 2 RFIC32 shown.

[0125] like Figure 16 As shown by the solid arrow in the middle, when electronic equipment transmits radio frequency signals through StarNet satellite communication, Figure 2 The baseband chip 31 controls the common terminal of the first switch 603 to be connected to the first gate terminal, and controls the common terminal of the switch 6013 to be connected to the third gate terminal through the control circuit 6014. Figure 2 The RF signal of the RFIC 32 shown enters the filter 609, and then the RF signal is transmitted to the PA 6011 through the switch 6013 and the first capacitor C1. The PA 6011 amplifies the RF signal. The RF 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.

[0126] like Figure 16 As shown by the dotted arrow in the middle, when the electronic device receives the radio frequency signal through the StarNet satellite communication, Figure 2 The baseband chip 31 controls the common end of the first switch 603 to be connected to the third gate end, and controls the common end of the second switch 606 to be electrically connected to the second gate end. The radio frequency signal from the antenna 34 is transmitted to the first LNA 605 through the first switch 603, and the first LNA 605 amplifies the radio frequency signal. The radio frequency signal is then transmitted to the first LNA 605 through the second switch 606 and the filter 613. Figure 2RFIC 32 is shown.

[0127] The embodiment of the present application provides a radio frequency front-end circuit that can be applied to electronic devices to support two satellite communication modes, Beidou satellite communication and Tiantong satellite communication. Figure 17 As shown, the RF front-end circuit includes an RF 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. If satellite communication does not need to share an antenna with cellular communication, the first switch 603 can reduce one port (the fourth selection port) and become an SP3T or SPDT switch.

[0128] The first end of the filter 607 is the input end of the radio frequency signal, which is used to Figure 2 The first end of the filter 608 is the input end of the RF signal, and is used to connect to the RFIC 32 in the RF front-end chip 601. Figure 2 The first control pin CTL1 and the second control pin CTL2 of the RF front-end chip 601 are used to communicate with the RFIC 32 in the RF front-end chip 601. Figure 2 The baseband chip 31 shown in FIG is electrically connected to the third power pin VBATT, the first power pin VCC1 and the second power pin VCC2 are used to be electrically connected to the power supply. The coupling output pin CPL OUT and the detection pin VDET of the RF front-end chip 601 are used to be electrically connected to the power supply. Figure 2 The baseband chip 31 shown in FIG is electrically connected. The antenna pin ANT of the RF front-end chip 601 is electrically connected to the first end of the harmonic suppression network 602. The second end of the harmonic suppression network 602 is electrically connected to the second end of the first switch 603. The common end of the first switch 403 is electrically connected to the antenna 34. The second selection end of the first switch 603 is electrically connected to the second end of the filter 611. The first end of the filter 611 is electrically connected to the input end of the second LNA 604. The output end of the second LNA 604 is electrically connected to the second end of the filter 610. The first end of the filter 610 is the output end of the RF signal, which is used to communicate with the first end of the filter 610. Figure 2 The third gate terminal of the first switch 603 is electrically connected to the input terminal of the first LNA 605, and the output terminal of the first LNA 605 is electrically connected to the second terminal of the filter 612. The first terminal of the filter 612 is the output terminal of the RF signal, which is used to Figure 2 The fourth selection end of the first switch 603 is electrically connected to the RFIC32 in the cellular communication module.

[0129] like Figure 18 As shown by the solid arrow in the middle, when electronic equipment transmits radio frequency signals through Tiantong satellite communication, Figure 2 The baseband chip 31 controls the common end of the first switch 603 to be connected to the first gate end, and controls the common end of the switch 6013 to be connected to the first gate end through the control circuit 6014. Figure 2 The RF signal of the RFIC 32 shown enters the filter 607, and then the RF signal is transmitted to the PA 6011 through the switch 6013 and the first capacitor C1. The PA 6011 amplifies the power of the RF signal. The RF 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.

[0130] like Figure 18 As shown by the dotted arrow in the middle, when the electronic device receives the radio frequency signal through the Tiantong satellite communication, Figure 2 The baseband chip 31 controls the common end of the first switch 603 to be connected to the third gate end, and controls the common end of the second switch 606 to be connected to the first gate end. The RF signal from the antenna 34 is transmitted to the first LNA 605 through the first switch 603. The first LNA 605 amplifies the RF signal and transmits it to the first LNA 605 through the filter 612. Figure 2 RFIC 32 is shown.

[0131] like Figure 19 As shown by the solid arrow in the middle, when electronic equipment transmits radio frequency signals through BeiDou satellite communication, Figure 2 The baseband chip 31 controls the common terminal of the first switch 603 to be connected to the first gate terminal, and controls the common terminal of the switch 6013 to be connected to the second gate terminal through the control circuit 6014. Figure 2 The RF signal of the RFIC 32 shown enters the filter 608, and then the RF signal is transmitted to the PA 6011 through the switch 6013 and the first capacitor C1. The PA 6011 amplifies the RF signal. The RF 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.

[0132] like Figure 19 As shown by the dotted arrow in the middle, when an electronic device receives a radio frequency signal through BeiDou satellite communication, Figure 2 The baseband chip 31 in the embodiment controls the common terminal of the first switch 603 and the second selection terminal to be connected, and 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 amplifies the radio frequency signal and transmits the radio frequency signal to the second LNA 604 through the filter 610. Figure 2RFIC 32 is shown.

[0133] The embodiment of the present application provides a radio frequency front-end circuit that can be applied to scenarios where electronic equipment supports two satellite communication modes, Beidou satellite communication and Starnet satellite communication. Figure 20 As shown, the RF front-end circuit includes an RF 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. If satellite communication does not need to share an antenna with cellular communication, the first switch 603 can reduce one port (the fourth selection port) and become an SP3T or SPDT switch.

[0134] The first end of the filter 608 is the input end of the radio frequency signal, which is used to Figure 2 The first end of the filter 609 is the input end of the RF signal, and is used to connect to the RFIC 32 in the RF front-end chip 601. Figure 2 The first control pin CTL1 and the second control pin CTL2 of the RF front-end chip 601 are used to connect to the RFIC 32 in the RF front-end chip 601. Figure 2 The baseband chip 31 shown in FIG is electrically connected to the third power pin VBATT, the first power pin VCC1 and the second power pin VCC2 are used to be electrically connected to the power supply. The coupling output pin CPL OUT and the detection pin VDET of the RF front-end chip 601 are used to be electrically connected to the power supply. Figure 2 The baseband chip 31 shown in FIG is electrically connected. The antenna pin ANT of the RF front-end chip 601 is electrically connected to the first end of the harmonic suppression network 602. The second end of the harmonic suppression network 602 is electrically connected to the second end of the first switch 603. The common end of the first switch 403 is electrically connected to the antenna 34. The second selection end of the first switch 603 is electrically connected to the second end of the filter 611. The first end of the filter 611 is electrically connected to the input end of the second LNA 604. The output end of the second LNA 604 is electrically connected to the second end of the filter 610. The first end of the filter 610 is the output end of the RF signal, which is used to communicate with the first end of the filter 610. Figure 2 The third gate terminal of the first switch 603 is electrically connected to the input terminal of the first LNA 605, and the output terminal of the first LNA 605 is electrically connected to the second terminal of the filter 613. The first terminal of the filter 613 is the output terminal of the RF signal, which is used to Figure 2 The fourth selection end of the first switch 603 is electrically connected to the RFIC32 in the cellular communication module.

[0135] like Figure 21 As shown by the solid arrow in the middle, when electronic equipment transmits radio frequency signals through StarNet satellite communication, Figure 2 The baseband chip 31 controls the common terminal of the first switch 603 to be connected to the first gate terminal, and controls the common terminal of the switch 6013 to be connected to the third gate terminal through the control circuit 6014. Figure 2 The RF signal of the RFIC 32 shown enters the filter 609, and then the RF signal is transmitted to the PA 6011 through the switch 6013 and the first capacitor C1. The PA 6011 amplifies the RF signal. The RF 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.

[0136] like Figure 21 As shown by the dotted arrow in the middle, when the electronic device receives the radio frequency signal through the StarNet satellite communication, Figure 2 The baseband chip 31 controls the common end of the first switch 603 to be connected to the third gate end, and controls the common end of the second switch 606 to be connected to the first gate end. The RF signal from the antenna 34 is transmitted to the first LNA 605 through the first switch 603. The first LNA 605 amplifies the RF signal and transmits it to the first LNA 605 through the filter 613. Figure 2 RFIC 32 is shown.

[0137] like Figure 22 As shown by the solid arrow in the middle, when electronic equipment transmits radio frequency signals through BeiDou satellite communication, Figure 2 The baseband chip 31 controls the common terminal of the first switch 603 to be connected to the first gate terminal, and controls the common terminal of the switch 6013 to be connected to the second gate terminal through the control circuit 6014. Figure 2 The RF signal of the RFIC 32 shown enters the filter 608, and then the RF signal is transmitted to the PA 6011 through the switch 6013 and the first capacitor C1. The PA 6011 amplifies the power of the RF signal. The RF 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.

[0138] like Figure 22 As shown by the dotted arrow in the middle, when an electronic device receives a radio frequency signal through BeiDou satellite communication, Figure 2 The baseband chip 31 in the embodiment controls the common terminal of the first switch 603 to be connected with the second selection terminal, and 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 amplifies the radio frequency signal and transmits the radio frequency signal to the second LNA 604 through the filter 610. Figure 2 RFIC 32 is shown.

[0139] The above-mentioned radio frequency front-end circuit is electrically connected to a single antenna, and the radio frequency front-end circuit can also be electrically connected to dual antennas.

[0140] by Figure 7 Take the RF end circuit shown in the figure as an example, Figure 23 As shown, in Figure 7 Based on the RF front-end circuit shown in FIG, the RF end circuit further includes a third switch 614, which is a SPDT switch. The common end of the first switch 603 is electrically connected to the common end of the third switch 614, the first selection end of the third switch 614 is electrically connected to the first antenna 341, and the second selection end of the third switch 614 is electrically connected to the second antenna 342. The third switch 614 is controlled by Figure 2 The baseband chip 31 is connected to the baseband chip 31. When the electronic device is performing satellite communication, the baseband chip 31 controls the third switch 614 to connect the common terminal to the first gate terminal; when the electronic device is performing cellular communication, the baseband chip 31 controls the third switch 614 to connect the common terminal to the second gate terminal. Alternatively, when the electronic device is performing one type of satellite communication, the baseband chip 31 controls the third switch 614 to connect the common terminal to the first gate terminal; when the electronic device is performing another type of satellite communication, the baseband chip 31 controls the third switch 614 to connect the common terminal to the second gate terminal.

[0141] Still Figure 7 Take the RF end circuit shown in the figure as an example, Figure 24 As shown, the first switch 603 can be a double-pole four-throw (DP4T) switch. The first common terminal of the first switch 603 is electrically connected to the first antenna 341, and the second common terminal of the first switch 603 is electrically connected to the second antenna 342. When the electronic device performs satellite communication, the baseband chip 31 controls the first switch 603 to connect the first common terminal to one of the first, second, and third gate terminals. When the electronic device performs cellular communication, the baseband chip 31 controls the first switch 603 to connect the second common terminal to the fourth gate terminal. Alternatively, when the electronic device performs one type of satellite communication, the baseband chip 31 controls the first switch 603 to connect the first common terminal to one of the first, second, and third gate terminals. When the electronic device performs another type of satellite communication, the baseband chip 31 controls the first switch 603 to connect the first common terminal to any of the other ports among the first, second, and third gate terminals.

[0142] It should be noted that Figure 23 The connection method of the first switch 603, the third switch 614, the first antenna 341, and the second antenna 342, and Figure 24The connection method of the first switch 603 and the first antenna 341 and the second antenna 342 can also be applied to other embodiments, such as Figure 7-Figure 22 middle.

[0143] Because satellite communications have high transmission power and large harmonic energy, a harmonic suppression network must be designed for each satellite communication type to suppress out-of-band spurious signals. This is different from cellular communications. Satellite communication protocols require that the spurious amplitude of harmonics in S-band satellite communications be less than -30dBm / MHz, while L-band satellite communications require that the spurious amplitude of harmonics be less than -50dBm / 4kHz. Although the PA 6011 in the RF front-end chip 601 can initially suppress the harmonics of the RF signal, its effectiveness is limited. For example, if the spurious amplitude of the PA's harmonics is -17dBm / 4kHz, the harmonic suppression network 602 is required to provide an additional 33dB (-17 + 50) of harmonic suppression for the L-band.

[0144] like Figure 25 As shown, an embodiment of the present application provides a structure of a harmonic suppression network 602, including: inductor L1, inductor L2, inductor L3, inductor L4, capacitor C1, capacitor C2, capacitor C3, capacitor C4, capacitor C5, capacitor C6, and capacitor C7.

[0145] The first end of inductor L1 serves as the first end of harmonic suppression network 602 and is electrically connected to the first end of inductor L3 and the first end of capacitor C2. The second end of capacitor C2 is electrically connected to the first end of inductor L4. The second end of inductor L2 and the second end of inductor L3 are grounded. The second end of inductor L1, the first end of capacitor C1, the first end of inductor L2, the first end of capacitor C3, and the first end of capacitor C5 are electrically connected. The second end of capacitor C1 is grounded. The second end of inductor L2 serves as the second end of harmonic suppression network 602 and is electrically connected to the second end of capacitor C4 and the second end of capacitor C6. The second end of capacitor C3 is electrically connected to the first end of capacitor C4, the second end of capacitor C5, the first end of capacitor C6, and the first end of capacitor C7. The second end of capacitor C7 is electrically connected.

[0146] The harmonic suppression network 602 can be applied to Figure 7 As shown, in the RF front-end circuit that supports three satellite communication modes. It can achieve harmonic suppression of RF signals in the L-band and S-band (1.61GHz~2.01GHz) in satellite communication, and increase the insertion loss in the L-band and S-band by 0.6dB. 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, C7=1pF. As Figure 26The S1 shown in Figure A is the loss of the harmonic suppression network 602 to the RF signal in the L-band and S-band (1.61GHz to 2.01GHz), and S2 is the loss of the harmonic suppression network 602 to the second harmonics (the main energy source of interference) of the L-band and S-band. It can be seen that the loss of the RF signal in the L-band and S-band is small, while the second harmonics of the L-band and S-band are well suppressed. Due to fluctuations in the production process, there are errors in the capacitance value of the capacitor and the inductance value of the inductor. Therefore, Figure 26 As shown in B, Figure 26 On the basis of A, by introducing the errors of capacitance and inductance, more curves can be drawn, and it can be determined that the maximum suppression degree of the second harmonic of the L-band and S-band by the harmonic suppression network 602 is about -35dB.

[0147] like Figure 27 As shown, an embodiment of the present application provides a structure of a harmonic suppression network 602, including: 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.

[0148] The first end of inductor L1 serves as the first end of harmonic suppression network 602 and is electrically connected to the first end of inductor L3 and the first end of capacitor C2. The second end of capacitor C2 is electrically connected to the first end of inductor L4. The second end of inductor L3 and the second end of inductor L4 are grounded. The second end of inductor L1, the first end of capacitor C1, the first end of inductor L2, and the first end of capacitor C3 are electrically connected. The second end of capacitor C1 is grounded. The second end of inductor L2 serves as the second end of harmonic suppression network 602 and is electrically connected to the second end of capacitor C4. The second end of capacitor C3 is electrically connected to the first end of capacitor C4.

[0149] The harmonic suppression network 602 can be applied to Figure 13 The RF front-end circuit supporting Beidou satellite communication shown in the figure can also be applied to Figure 17 The RF front-end circuit supporting Beidou satellite communication and Starnet satellite communication is shown. Beidou satellite communication and Starnet satellite communication are both located in the L-band, so the harmonic suppression network 602 can achieve harmonic suppression of the RF signal in the L-band in satellite communication, and only increase the insertion loss in the L-band by 0.4dB, and increase the insertion loss in the S-band by 0.8dB (actually has no effect on Beidou satellite communication and Starnet satellite communication). For example, L1 = 4.3nH, L2 = 3nH, L3 = 5.6nH, L4 = 1.3nH, C1 = 1.5pF, C2 = 1.5pF, C3 = 56pF, C4 = 0.4pF. As shown Figure 28As shown in the figure, after introducing capacitance and inductance errors, S1 represents the loss of the L-band RF signal by the harmonic suppression network 602, and S2 represents the loss of the L-band second harmonic (the main source of interference energy). It can be seen that the loss of the L-band RF signal is small, while the L-band second harmonic is well suppressed. By analyzing multiple curves, it can be determined that the maximum suppression level of the L-band second harmonic by the harmonic suppression network 602 is approximately -35dB.

[0150] like Figure 29 As shown, an embodiment of the present application provides a structure of a harmonic suppression network 602, including: an inductor L1, an inductor L2, a capacitor C1, a capacitor C3, and a capacitor C4.

[0151] The first end of the inductor L1 serves 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, and the first end of the capacitor C3 are electrically connected. The second end of the capacitor C1 is grounded. The second end of the inductor L2 serves as the second end of the harmonic suppression network 602 and 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. The harmonic suppression network 602 can be applied to Figure 11 The RF front-end circuit supporting StarNet satellite communication or Tiantong satellite communication is shown.

[0152] StarNet satellite communication is in the L-band. The harmonic suppression network 602 can achieve harmonic suppression of the L-band RF signal in satellite communication, increasing the insertion loss in the L-band by only 0.2dB and the insertion loss in the S-band by 0.5dB (which actually has no effect on StarNet satellite communication). For example, L1 = 3nH, L2 = 3nH, C1 = 1.2pF, C3 = 1.2pF, C4 = 1pF. Figure 30 As shown in the figure, after introducing capacitance and inductance errors, S1 represents the loss of the L-band RF signal by the harmonic suppression network 602, and S2 represents the loss of the L-band second harmonic (the main source of interference energy). It can be seen that the loss of the L-band RF signal is small, while the L-band second harmonic is well suppressed. By analyzing multiple curves, it can be determined that the maximum suppression level of the L-band second harmonic by the harmonic suppression network 602 is approximately -36dB.

[0153] Tiantong satellite communication is in the S band. The harmonic suppression network 602 can achieve harmonic suppression of the S band RF signal in satellite communication, and only increase the insertion loss in the S band by 0.3dB. For example, L1 = 3nH, L2 = 3nH, C1 = 1pF, C3 = 1pF, C4 = 0.5pF. Figure 31As shown in the figure, after introducing capacitance and inductance errors, S1 represents the loss of the S-band RF signal by the harmonic suppression network 602, and S2 represents the loss of the S-band second harmonic (the main source of interference energy). It can be seen that the loss of the S-band RF signal is small, while the S-band second harmonic is well suppressed. By analyzing multiple curves, it can be determined that the maximum suppression level of the S-band second harmonic by the harmonic suppression network 602 is approximately -44dB.

[0154] like Figure 32 As shown, an embodiment of the present application provides a structure of a harmonic suppression network 602, including: 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.

[0155] The first end of inductor L1 serves as the first end of harmonic suppression network 602. The second end of inductor L1, the first end of capacitor C1, the first end of inductor L2, the first end of capacitor C3, and the first end of inductor L5 are electrically connected, and the second end of capacitor C1 is grounded. The second end of inductor L2 serves as the second end of harmonic suppression network 602 and is electrically connected to the second end of capacitor C4 and the second end of inductor L6. The second end of capacitor C3 is electrically connected to the first end of capacitor C4, the second end of inductor L5, the first end of inductor L6, and the first end of capacitor C7 are electrically connected, and the second end of capacitor C7 is electrically connected. This harmonic suppression network 602 can be applied to Figure 14 The RF front-end circuit shown supports StarNet satellite communication and Tiantong satellite communication.

[0156] StarNet satellite communication is in the L-band, and Tiantong satellite communication is in the S-band. The harmonic suppression network 602 can achieve harmonic suppression of the RF signals in the S-band and L-band in satellite communication, increasing the insertion loss in the S-band by 0.4dB and the insertion loss in the L-band by 0.35dB. For example, L1 = 3nH, L2 = 3nH, L5 = 22nH, L6 = 2.7nH, C1 = 1.2pF, C3 = 1.2pF, C4 = 1pF, and C7 = 0.5pF. Figure 33 As shown in the figure, after introducing capacitance and inductance errors, S1 represents the loss of RF signals within the S- and L-bands by harmonic suppression network 602, and S2 represents the loss of the second harmonics (the main source of interference energy) within the L- and S-bands by harmonic suppression network 602. It can be seen that the loss of RF signals within the S- and L-bands is relatively small, while the second harmonics of the L- and S-bands are well suppressed. By analyzing multiple curves, it can be determined that the maximum suppression of the second harmonics of the L- and S-bands by harmonic suppression network 602 is approximately -42dB.

[0157] In the RF front-end chip, RF front-end circuit, and electronic device provided by the embodiments of the present application, multiple strobe terminals of a switch are electrically connected to multiple input pins, each of which can input a RF signal of a satellite communication method. The common terminal of the switch is electrically connected to the input terminal of the PA. The switch is controlled by a control signal input from a control pin, selecting one of the multiple strobe terminals of the switch to be connected to the common terminal, thereby selecting one of the multiple input pins to be connected to the input terminal of the PA. This realizes an RF front-end chip that integrates multiple satellite communication methods, facilitating the miniaturization of electronic devices.

[0158] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A radio frequency front-end chip, characterized in that: include: A power amplifier PA, a coupler, a switch, a control circuit, a bias circuit, a first capacitor, a second capacitor, multiple input pins, a control pin, a first power pin, a second power pin, a third power pin, an antenna pin, a coupled output pin, a detection pin, and a ground pin; The multiple input pins are electrically connected to the multiple selection terminals of the switch respectively; the 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 pin and the bias circuit, the bias circuit is electrically connected to the PA, and the PA is electrically connected to the first power pin and the second power pin; the common terminal of the switch is electrically connected to the first end of the first capacitor, the second end of the first capacitor is electrically connected to the input terminal of the PA, the output terminal of the PA is electrically connected to the input terminal of the coupler, the through terminal of the coupler is electrically connected to the first end of the second capacitor, the coupling terminal of the coupler is electrically connected to the coupling output pin and the detection pin; the second end of the second capacitor is electrically connected to the antenna pin; The multiple input pins are used to input radio frequency signals of different satellite communication modes; the control pin is used to control the switch to connect one of the multiple selection terminals to the common terminal through the control circuit, and to control the bias voltage output by the bias circuit to the PA; the coupled output pin is used to output the coupled radio frequency signal, and the detection pin is used to output a DC signal indicating the power of the PA; the antenna pin is used to be electrically connected to the antenna; the first power pin is used to power the driving stage of the PA, the second power pin is used to power the last stage of the PA, the third power pin is used to power the control circuit and provide the bias voltage and bias current to the PA through the bias circuit, and the ground pin is used for grounding.

2. The RF front-end chip according to claim 1, characterized in that: The plurality of input pins include a first input pin, a second input pin and a third input pin, and the plurality of strobe terminals of the switch include a first strobe terminal, a second strobe terminal and a third strobe terminal; The first input pin is electrically connected to the first selection terminal of the switch, the second input pin is electrically connected to the second selection terminal of the switch, and the third input pin is electrically connected to the third selection terminal of the switch.

3. The RF front-end chip according to claim 2, characterized in that: The control pins include a first control pin and a second control pin, and the first control pin and the second control pin are used to control the switch to connect one of the first selection terminal, the second selection terminal, and the third selection terminal to the common terminal through the control circuit.

4. The RF front-end chip according to any one of claims 1 to 3, characterized in that: The RF front-end chip is packaged in a quadrilateral, the multiple input pins are located on the first side of the quadrilateral; the antenna pin and the coupling output pin are located on the third side of the quadrilateral; the first side is opposite to the third side.

5. The RF front-end chip according to claim 4, characterized in that: The control pin, the detection pin, and the third power pin are located on the fourth side of the quadrilateral.

6. The RF front-end chip according to claim 4, characterized in that: The first power pin and the second power pin are located on a second side of the quadrilateral.

7. The RF front-end chip according to claim 4, characterized in that: The remaining pins of the RF front-end chip are all ground pins, and multiple ground pins are distributed in the center and four corners of the RF front-end chip.

8. The RF front-end chip according to claim 4, characterized in that: The package size of the RF front-end chip is 3.5mm*3.5mm.

9. A radio frequency front-end circuit, characterized in that: The method comprises the radio frequency front-end chip according to any one of claims 1 to 8, a harmonic suppression network, a first switch, a first low noise amplifier LNA, a first filter, and a second filter; The first end of the first filter is an input end of the RF signal, the second end of the first filter is electrically connected to the first input pin of the RF front-end chip, the first control pin and the second control pin of the RF front-end chip are used to be electrically connected to the baseband chip, the first power pin, the second power pin and the third power pin of the RF front-end chip are used to be electrically connected to the power supply, the coupling output pin and the detection pin of the RF front-end chip are used to be electrically connected to the baseband chip, and the antenna pin of the RF front-end chip is electrically connected to the first end of the harmonic suppression network; the second end of the harmonic suppression network is electrically connected to the first selection end of the first switch, the first common end of the first switch is used to be electrically connected to the antenna, the second selection end of the first switch is electrically connected to the input end of the first LNA, the output end of the first LNA is electrically connected to the second end of the second filter, and the first end of the second filter is an output end of the RF signal.

10. The circuit according to claim 9, characterized in that A third filter is further included, and the second selection end of the first switch is electrically connected to the input end of the first LNA through the third filter.

11. The circuit according to claim 9, characterized in that Also includes a second switch, a fourth filter, and a fifth filter, The first end of the fourth filter is an input end of the RF signal, the second end of the fourth filter is electrically connected to the second input pin of the RF front-end chip, the output end of the first LNA is electrically connected to the common end of the second switch, the first selection end of the second switch is electrically connected to the second end of the second filter, the second selection end of the second switch is electrically connected to the second end of the fifth filter, and the first end of the fifth filter is an output end of the RF signal.

12. The circuit according to claim 9 or 11, characterized in that Also includes a second switch, a fourth filter, a sixth filter, a seventh filter, a second LNA, A first end of the fourth filter is an input end of the RF signal, a second end of the fourth filter is electrically connected to the second input pin of the RF front-end chip, a third selection end of the first switch is electrically connected to the input end of the first LNA through the sixth filter, an output end of the first LNA is electrically connected to the second end of the seventh filter, and a first end of the seventh filter is an output end of the RF signal.

13. The circuit according to claim 12, characterized in that It also includes an eighth filter, the first end of the eighth filter is the input end of the radio frequency signal, and the second end of the eighth filter is electrically connected to the third input pin of the radio frequency front-end chip.

14. The circuit according to claim 9, characterized in that A third switch is further included, wherein the first common terminal of the first switch is electrically connected to the common terminal of the third switch, the first selection terminal of the third switch is electrically connected to the first antenna, and the second selection terminal of the third switch is electrically connected to the second antenna.

15. The circuit according to claim 9, characterized in that A first common end of the first switch is electrically connected to the first antenna, and a second common end of the first switch is electrically connected to the second antenna.

16. The circuit according to claim 9, characterized in that 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 serves as the 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 serves as the second end of the harmonic suppression network and is electrically connected to the second end of the fourth capacitor; the second end of the third capacitor is electrically connected to the first end of the fourth capacitor.

17. The circuit according to claim 16, characterized in that The harmonic suppression network also includes: a third inductor, a fourth inductor, and a second capacitor; the first end of the first inductor is electrically connected to 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 to 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.

18. The circuit according to claim 17, characterized in that The harmonic suppression network also includes: a fifth capacitor, a sixth capacitor, and a seventh capacitor; the first end of the third capacitor is electrically connected to 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 to the second end of the fourth capacitor.

19. The circuit according to claim 16, wherein: The harmonic suppression network also includes: a fifth inductor, a sixth inductor, and a seventh capacitor; the first end of the second inductor is electrically connected to the first end of the fifth inductor, the second end of the second inductor is electrically connected to 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.

20. An electronic device, characterized in that: It includes a baseband chip, a radio frequency integrated circuit, an antenna and the radio frequency front-end circuit as described in any one of claims 9 to 19, the baseband chip is electrically connected to the radio frequency integrated circuit and the radio frequency front-end circuit, the radio frequency integrated circuit is electrically connected to the radio frequency front-end circuit, and the radio frequency integrated circuit is electrically connected to the antenna.

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