Radio frequency front-end module

Abstract

The utility model provides a radio frequency front-end module. The radio frequency front-end module comprises a substrate, a first chip, a second chip, a third chip, a coupler, a Bluetooth signal transmitting end, a radio frequency signal transmitting end, an antenna end, a radio frequency signal receiving end and a coupling power output end, the first chip, the second chip, the third chip and the coupler are all fixed on the substrate; the first chip is integrated with a power amplification circuit and a resistor, the second chip is integrated with a logic control circuit and a first voltage conversion circuit, and the third chip is integrated with a first switching circuit and a second switching circuit. According to the utility model, the mode of controlling the transmitting power of the radio frequency front-end module can be simplified, the radiation is reduced, the energy consumption is reduced, and the service life of the radio frequency front-end module is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of wireless communication technology, and in particular to a radio frequency front-end module. Background Technology

[0002] In TDD (Time Division Duplex) systems such as Wi-Fi, a radio frequency front-end module (FEM) is often required. The FEM consists of circuits such as radio frequency switches, power amplifiers (PA), and low-noise amplifiers (LNA).

[0003] The RF switch switches the RF path according to the transmit / receive timing control signal, the RF power amplifier amplifies the transmitted signal, and the low-noise amplifier amplifies the received weak signal. However, in actual circuit operation, the received signal strength varies greatly, with a dynamic range exceeding 90dB. To handle strong signals, a bypass channel needs to be designed in the receiving path. When a strong signal is received, the RF front-end module internally opens the bypass channel and closes the low-noise amplifier channel; when a weak signal is received, the bypass channel closes and the low-noise amplifier channel opens.

[0004] In the existing technology, the circuit control of the transmission power of the radio frequency front-end module is relatively complex, and the radiation and energy consumption are high, which cannot meet the needs of practical applications. Utility Model Content

[0005] To address the shortcomings of the existing technologies, this utility model proposes a radio frequency front-end module to solve the problems of complex control methods for the transmission power of radio frequency front-end modules, as well as high radiation and energy consumption.

[0006] To address the aforementioned technical problems, this utility model provides a radio frequency front-end module, comprising a substrate, a first chip, a second chip, a third chip, a coupler, a Bluetooth signal transmitter, a radio frequency signal transmitter, an antenna, a radio frequency signal receiver, and a coupled power output terminal; the first chip, the second chip, the third chip, and the coupler are all fixed to the substrate; the first chip integrates a power amplifier circuit and a resistor, the second chip integrates a logic control circuit and a first voltage conversion circuit, and the third chip integrates a first switching circuit and a second switching circuit;

[0007] The first input terminal of the power amplifier circuit is used to connect to an external first power source, and the output terminal of the power amplifier circuit is connected to the input terminal of the coupler.

[0008] The first terminal of the resistor is grounded.

[0009] The input terminal of the logic control circuit is used to receive externally transmitted level signals, and the output terminal of the logic control circuit is used to output logic control signals according to the received level signals.

[0010] The first input terminal of the first voltage conversion circuit is connected to an external second power supply, the second input terminal of the first voltage conversion circuit is connected to the output terminal of the logic control circuit, and the output terminal of the first voltage conversion circuit is connected to the second input terminal of the power amplifier circuit.

[0011] The first input terminal of the first switching circuit is connected to the Bluetooth signal transmitting terminal, the second input terminal of the first switching circuit is connected to the radio frequency signal transmitting terminal, the third input terminal of the first switching circuit is connected to the output terminal of the logic control circuit, the first output terminal of the first switching circuit is connected to the third input terminal of the power amplifier circuit, and the second output terminal of the first switching circuit is connected to the input terminal of the coupler. The first switching circuit is used to control whether the first input terminal of the first switching circuit is connected to the Bluetooth signal transmitting terminal, whether the second input terminal of the first switching circuit is connected to the radio frequency signal transmitting terminal, whether the first output terminal of the first switching circuit is connected to the third input terminal of the power amplifier circuit, and whether the second output terminal of the first switching circuit is connected to the input terminal of the coupler, according to the logic control signal output by the output terminal of the logic control circuit.

[0012] The control terminal of the second switching circuit is connected to the antenna terminal, the first connection terminal of the second switching circuit is connected to the radio frequency signal receiving terminal, the second connection terminal of the second switching circuit is connected to the output terminal of the coupler, and the input terminal of the second switching circuit is connected to the output terminal of the logic control circuit. The second switching circuit is used to control the control terminal of the second switching circuit to connect to the first connection terminal or the second connection terminal of the second switching circuit according to the logic control signal output by the output terminal of the logic control circuit.

[0013] The isolation terminal of the coupler is connected to the second terminal of the resistor, and the coupling terminal of the coupler is connected to the coupling power output terminal.

[0014] Preferably, the power amplifier circuit includes an input matching circuit, a power amplifier, an output matching circuit, and a bias circuit;

[0015] The input terminal of the input matching circuit serves as the third input terminal of the power amplifier circuit.

[0016] The first input terminal of the power amplifier is connected to the output terminal of the input matching circuit, and the second input terminal of the power amplifier serves as the first input terminal of the power amplifier circuit.

[0017] The input terminal of the output matching circuit is connected to the output terminal of the power amplifier, and the output terminal of the output matching circuit serves as the output terminal of the power amplifier circuit.

[0018] The input terminal of the bias circuit serves as the second input terminal of the power amplifier circuit, and the output terminal of the bias circuit is connected to the third input terminal of the power amplifier.

[0019] Preferably, the power amplifier consists of a multi-stage transistor amplifier circuit.

[0020] Preferably, the first switching circuit includes a first single-pole single-throw radio frequency switch, a single-pole triple-throw radio frequency switch, and a second single-pole single-throw radio frequency switch;

[0021] The first connection terminal of the first single-pole single-throw radio frequency switch is connected to the Bluetooth signal transmitting terminal, the second connection terminal of the first single-pole single-throw radio frequency switch is connected to the input terminal of the coupler, and the control terminal of the first single-pole single-throw radio frequency switch is connected to the output terminal of the logic control circuit, and is used to control the opening or closing of the first single-pole single-throw radio frequency switch according to the logic control signal output by the output terminal of the logic control circuit.

[0022] The common terminal of the single-pole triple-throw RF switch is connected to the input terminal of the power amplifier circuit. The first connection terminal of the single-pole triple-throw RF switch is connected to the Bluetooth signal transmitter. The second connection terminal of the single-pole triple-throw RF switch is connected to the RF signal transmitter. The third connection terminal of the single-pole triple-throw RF switch is left floating. The first and second control terminals of the single-pole triple-throw RF switch are respectively connected to the output terminal of the logic control circuit. They are used to control the common terminal of the single-pole triple-throw RF switch to connect to one of the first, second, and third connection terminals of the single-pole triple-throw RF switch according to the logic control signal output by the output terminal of the logic control circuit.

[0023] The first connection terminal of the second single-pole single-throw radio frequency switch is connected to the radio frequency signal transmitting terminal, the second connection terminal of the second single-pole single-throw radio frequency switch is connected to the input terminal of the coupler, and the control terminal of the second single-pole single-throw radio frequency switch is connected to the output terminal of the logic control circuit, and is used to control the opening or closing of the second single-pole single-throw radio frequency switch according to the logic control signal output by the output terminal of the logic control circuit.

[0024] The first connection terminal of the first single-pole single-throw RF switch and the first connection terminal of the single-pole triple-throw RF switch together serve as the first input terminal of the first switching circuit. The second connection terminal of the single-pole triple-throw RF switch and the first connection terminal of the second single-pole single-throw RF switch together serve as the second input terminal of the first switching circuit. The common terminal of the single-pole triple-throw RF switch serves as the first output terminal of the first switching circuit. The second connection terminal of the first single-pole single-throw RF switch and the second connection terminal of the second single-pole single-throw RF switch together serve as the second output terminal of the first switching circuit. The control terminal of the first single-pole single-throw RF switch, the first control terminal and the second control terminal of the single-pole triple-throw RF switch, and the control terminal of the second single-pole single-throw RF switch together serve as the third input terminal of the first switching circuit.

[0025] Preferably, the second switching circuit includes a single-pole double-throw (SPD) RF switch; the common terminal of the SPD RF switch serves as the control terminal of the second switching circuit, the first connection terminal of the SPD RF switch serves as the first connection terminal of the second switching circuit, the second connection terminal of the SPD RF switch serves as the second connection terminal of the second switching circuit, and the control terminal of the SPD RF switch serves as the input terminal of the second switching circuit.

[0026] Preferably, the second switching circuit further includes a second voltage conversion circuit and a low-noise amplifier;

[0027] The first input terminal of the second voltage conversion circuit is used to connect to an external second power supply, and the second input terminal of the second voltage converter is connected to the output terminal of the logic control circuit.

[0028] The first input terminal of the low-noise amplifier is connected to the first connection terminal of the single-pole double-throw radio frequency switch, the second input terminal of the low-noise amplifier is connected to the output terminal of the second voltage conversion circuit, and the output terminal of the low-noise amplifier is connected to the radio frequency signal receiving terminal.

[0029] Preferably, the second switching circuit further includes a third single-pole single-throw radio frequency switch; the third single-pole single-throw radio frequency switch further includes a first connection terminal connected to the first connection terminal of the single-pole double-throw radio frequency switch, a second connection terminal of the third single-pole single-throw radio frequency switch connected to the radio frequency signal receiving terminal, and a control terminal of the third single-pole single-throw radio frequency switch connected to the output terminal of the logic control circuit, and used to control the opening or closing of the third single-pole single-throw radio frequency switch according to the logic control signal output by the output terminal of the logic control circuit.

[0030] Preferably, the first chip, the second chip, and the third chip are fixedly connected to the substrate by means of silver paste or solder balls.

[0031] Preferably, the substrate, the first chip, the second chip, and the third chip are electrically connected by metal wires or by solder balls in an upside-down mounting configuration.

[0032] Preferably, the first chip is fabricated using GaAs technology; the second chip is fabricated using CMOS technology; and the third chip is fabricated using PHEMT technology or SOI technology.

[0033] Compared with the prior art, the RF front-end module of this utility model is designed with a first chip, a second chip, a third chip and a coupler. The first chip integrates a power amplifier circuit and a resistor, the second chip integrates a logic control circuit and a first voltage conversion circuit, and the third chip integrates a first switching circuit and a second switching circuit. The connection method of each circuit is also defined, which simplifies the way the RF front-end module controls its transmission power, reduces radiation, lowers energy consumption and improves the service life of the RF front-end module. Attached Figure Description

[0034] The present invention will now be described in detail with reference to the accompanying drawings. The above and other aspects of the present invention will become clearer and easier to understand through the detailed description in conjunction with the following drawings. In the drawings:

[0035] Figure 1 This is a schematic diagram of the structure of the radio frequency front-end module provided in an embodiment of the present utility model. Detailed Implementation

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings of this application, are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, not to describe a particular order.

[0037] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0039] This utility model embodiment provides a radio frequency front-end module 100, combined with... Figure 1 As shown, it includes a substrate 110, a first chip 120, a second chip 130, a third chip 140, a coupler, a Bluetooth signal transmitter BT, an RF signal transmitter TX, an antenna ANT, an RF signal receiver RX, and a coupled power output terminal CPLR; the first chip 120, the second chip 130, the third chip 140, and the coupler are all fixed to the substrate 110; the first chip 120 integrates a power amplifier circuit 121 and a resistor, the second chip 130 integrates a logic control circuit 131 and a first voltage conversion circuit 132, and the third chip 140 integrates a first switching circuit 141 and a second switching circuit 142.

[0040] Among them, the first chip 120 can also be understood as Die1, the second chip 130 can also be understood as Die2, and the third chip 140 can also be understood as Die3.

[0041] The first input terminal of the power amplifier circuit 121 is connected to the external first power supply VCC, and the output terminal of the power amplifier circuit 121 is connected to the input terminal of the coupler.

[0042] The first end of the resistor is grounded.

[0043] The input terminal of the logic control circuit 131 is used to receive externally transmitted level signals, and the output terminal of the logic control circuit 131 is used to output logic control signals according to the received level signals; the level signals are mainly sent by the external host computer.

[0044] The first input terminal of the first voltage conversion circuit 132 is connected to the external second power supply VDD. The second input terminal of the first voltage conversion circuit 132 is connected to the output terminal of the logic control circuit 131. The output terminal of the first voltage conversion circuit 132 is connected to the second input terminal of the power amplifier circuit 121.

[0045] The first input terminal of the first switching circuit 141 is connected to the Bluetooth signal transmitter BT, the second input terminal of the first switching circuit 141 is connected to the radio frequency signal transmitter TX, the third input terminal of the first switching circuit 141 is connected to the output terminal of the logic control circuit 131, the first output terminal of the first switching circuit 141 is connected to the third input terminal of the power amplifier circuit 121, and the second output terminal of the first switching circuit 141 is connected to the input terminal of the coupler. The first switching circuit 141 is used to control whether the first input terminal of the first switching circuit 141 is connected to the Bluetooth signal transmitter BT, whether the second input terminal of the first switching circuit 141 is connected to the radio frequency signal transmitter TX, and whether the first output terminal of the first switching circuit 141 is connected to the third input terminal of the power amplifier circuit 121 and whether the second output terminal of the first switching circuit 141 is connected to the input terminal of the coupler, according to the logic control signal output by the output terminal of the logic control circuit 131.

[0046] The control terminal of the second switching circuit 142 is connected to the antenna terminal ANT, the first connection terminal of the second switching circuit 142 is connected to the radio frequency signal receiving terminal RX, the second connection terminal of the second switching circuit 142 is connected to the output terminal of the coupler Coupler, and the input terminal of the second switching circuit 142 is connected to the output terminal of the logic control circuit 131. The input terminal of the second switching circuit 142 is used to control the control terminal of the second switching circuit 142 to connect to the first connection terminal or the second connection terminal of the second switching circuit 142 according to the logic control signal output by the output terminal of the logic control circuit 131.

[0047] The isolation terminal of the coupler is connected to the second terminal of the resistor, and the coupling terminal of the coupler is connected to the coupling power output terminal CPLR.

[0048] In this embodiment, the first chip 120, the second chip 130, and the third chip 140 are fixedly connected to the substrate 110 by means of silver paste or solder balls. The first chip 120, the second chip 130, and the third chip 140 can also be fixed to the substrate 110 by other fixing methods.

[0049] The substrate 110, the first chip 120, the second chip 130, and the third chip 140 are electrically connected by thin metal wires or by solder balls in an upside-down mounting configuration. The first chip 120, the second chip 130, and the third chip 140 can also be electrically connected using other methods.

[0050] The first chip 120 is fabricated using a GaAs process; the second chip 130 is fabricated using a CMOS process; and the third chip 140 is fabricated using a PHEMT process or an SOI process. The first chip 120, the second chip 130, and the third chip 140 can also be fabricated using other processes.

[0051] In this embodiment, the power amplifier circuit 121 includes an input matching circuit 1211, a power amplifier PA, an output matching circuit 1212, and a bias circuit 1213.

[0052] The input terminal of the input matching circuit 1211 serves as the third input terminal of the power amplifier circuit 121.

[0053] The first input terminal of the power amplifier PA is connected to the output terminal of the input matching circuit 1211, and the second input terminal of the power amplifier PA serves as the first input terminal of the power amplifier circuit 121.

[0054] The input terminal of the output matching circuit 1212 is connected to the output terminal of the power amplifier PA, and the output terminal of the output matching circuit 1212 serves as the output terminal of the power amplifier circuit 121.

[0055] The input terminal of the bias circuit 1213 serves as the second input terminal of the power amplifier circuit 121, and the output terminal of the bias circuit 1213 is connected to the third input terminal of the power amplifier PA.

[0056] A power amplifier (PA) consists of a multi-stage transistor amplifier circuit, such as a three-stage transistor amplifier circuit or a four-stage transistor amplifier circuit. The transistors can be bipolar transistors or field-effect transistors.

[0057] In this embodiment, the first switching circuit 141 includes a first single-pole single-throw RF switch SW1, a single-pole triple-throw RF switch SW4, and a second single-pole single-throw RF switch SW2.

[0058] The first connection terminal of the first single-pole single-throw RF switch SW1 is connected to the Bluetooth signal transmitter BT, the second connection terminal of the first single-pole single-throw RF switch SW1 is connected to the input terminal of the coupler, and the control terminal of the first single-pole single-throw RF switch SW1 is connected to the output terminal of the logic control circuit 131 and is used to control the opening or closing of the first single-pole single-throw RF switch SW1 according to the logic control signal output by the output terminal of the logic control circuit 131.

[0059] The common terminal of the single-pole triple-throw RF switch SW4 is connected to the input terminal of the power amplifier circuit 121. The first connection terminal of the single-pole triple-throw RF switch SW4 is connected to the Bluetooth signal transmitter BT. The second connection terminal of the single-pole triple-throw RF switch SW4 is connected to the RF signal transmitter TX. The third connection terminal of the single-pole triple-throw RF switch SW4 is left floating. The first and second control terminals of the single-pole triple-throw RF switch SW4 are respectively connected to the output terminal of the logic control circuit 131. They are used to control the common terminal of the single-pole triple-throw RF switch SW4 to connect to one of the first, second, and third connection terminals of the single-pole triple-throw RF switch SW4 according to the logic control signal output by the output terminal of the logic control circuit 131.

[0060] The first connection terminal of the second single-pole single-throw RF switch SW2 is connected to the RF signal transmitting terminal TX, the second connection terminal of the second single-pole single-throw RF switch SW2 is connected to the input terminal of the coupler, and the control terminal of the second single-pole single-throw RF switch SW2 is connected to the output terminal of the logic control circuit 131 and is used to control the opening or closing of the second single-pole single-throw RF switch SW2 according to the logic control signal output by the output terminal of the logic control circuit 131.

[0061] The first connection terminal of the first single-pole single-throw RF switch SW1 and the first connection terminal of the single-pole triple-throw RF switch SW4 together serve as the first input terminal of the first switching circuit 141. The second connection terminal of the single-pole triple-throw RF switch SW4 and the first connection terminal of the second single-pole single-throw RF switch SW2 together serve as the second input terminal of the first switching circuit 141. The common terminal of the single-pole triple-throw RF switch SW4 serves as the first output terminal of the first switching circuit 141. The second connection terminal of the first single-pole single-throw RF switch SW1 and the second connection terminal of the second single-pole single-throw RF switch SW2 together serve as the second output terminal of the first switching circuit 141. The control terminal of the first single-pole single-throw RF switch SW1, the first and second control terminals of the single-pole triple-throw RF switch SW4, and the control terminal of the second single-pole single-throw RF switch SW2 together serve as the third input terminal of the first switching circuit 141.

[0062] In this embodiment, the second switching circuit 142 includes a single-pole double-throw radio frequency switch SW5; the common terminal of the single-pole double-throw radio frequency switch SW5 serves as the control terminal of the second switching circuit 142, the first connection terminal of the single-pole double-throw radio frequency switch SW5 serves as the first connection terminal of the second switching circuit 142, the second connection terminal of the single-pole double-throw radio frequency switch SW5 serves as the second connection terminal of the second switching circuit 142, and the control terminal of the single-pole double-throw radio frequency switch SW5 serves as the input terminal of the second switching circuit 142.

[0063] The second switching circuit 142 also includes a second voltage conversion circuit 1421 and a low-noise amplifier;

[0064] The first input terminal of the second voltage conversion circuit 1421 is used to connect to the external second power supply VDD, and the second input terminal of the second voltage converter is connected to the output terminal of the logic control circuit 131.

[0065] The first input terminal of the low-noise amplifier is connected to the first connection terminal of the single-pole double-throw RF switch SW5, the second input terminal of the low-noise amplifier is connected to the output terminal of the second voltage conversion circuit 1421, and the output terminal of the low-noise amplifier is connected to the RF signal receiver RX.

[0066] The second switching circuit 142 also includes a third single-pole single-throw RF switch SW3; the third single-pole single-throw RF switch SW3 also includes a first connection terminal connected to the first connection terminal of the single-pole double-throw RF switch SW5, a second connection terminal of the third single-pole single-throw RF switch SW3 connected to the RF signal receiving terminal RX, and a control terminal of the third single-pole single-throw RF switch SW3 connected to the output terminal of the logic control circuit 131, and used to control the opening or closing of the third single-pole single-throw RF switch SW3 according to the logic control signal output by the output terminal of the logic control circuit 131.

[0067] In this embodiment, the logic control circuit 131 has eight output terminals, which are respectively connected to the second input terminal of the first voltage conversion circuit 132, the control terminal of the first single-pole single-throw RF switch SW1, the first and second control terminals of the single-pole triple-throw RF switch SW4, the control terminal of the second single-pole single-throw RF switch SW2, the control terminal of the third single-pole single-throw RF switch SW3, the second input terminal of the second voltage converter, and the control terminal of the third single-pole single-throw RF switch SW3. The output logic control signals are the first logic control signal CNT1, the second logic control signal CNT2, the third logic control signal CNT3, the fourth logic control signal CNT4, the fifth logic control signal CNT5, the sixth logic control signal CNT6, the seventh logic control signal CNT7, and the eighth logic control signal CNT8.

[0068] The eight output terminals of the logic control circuit 131 output different logic control signals to control the working states of the first voltage conversion circuit 132, the second voltage conversion circuit 1421, the first single-pole single-throw RF switch SW1, the second single-pole single-throw RF switch SW2, the third single-pole single-throw RF switch SW3, the single-pole double-throw RF switch SW5, and the single-pole triple-throw RF switch SW4, respectively.

[0069] The Bluetooth signal is provided by an external Bluetooth transmitting circuit, which sends the Bluetooth signal to the Bluetooth signal transmitter BT so that the Bluetooth signal enters the RF front-end module 100. The RF signal is provided by an external WIFI transmitting circuit, which sends the RF signal to the RF signal transmitter TX so that the RF signal enters the RF front-end module 100. The antenna terminal ANT is used to send or receive external signals, which can be Bluetooth signals or other RF signals. The RF signal receiving terminal RX is used to provide RF signals to external RF signal receiving devices, that is, the RF front-end module 100 sends signals to external RF signal receiving devices so that the external RF signal receiving devices can receive the signals.

[0070] The input matching circuit 1211 is used to convert the impedance of the RF signal transmitter TX to the optimal match required by the third input of the power amplifier PA; the power amplifier PA is used to amplify the input Bluetooth signal or RF signal; the output matching circuit 1212 is used to achieve the optimal match between the signal received at its input and the antenna ANT.

[0071] The RF signal output by the output matching circuit 1212 passes through the input terminal of the coupler, and then from the output terminal of the coupler to the second connection terminal of the single-pole double-throw RF switch SW5. The coupling output terminal of the coupler outputs a coupling signal to an external pin, namely the coupling power output terminal CPLR. The output power of the coupling power output terminal CPLR is determined by the input power of the coupler input terminal and the coupling coefficient of the coupler. The isolation terminal of the coupler is connected to a resistor, the resistance of which is generally set to 50Ω.

[0072] The first power supply VCC is used to provide operating power to the power amplifier PA; the bias circuit 1213 is used to provide bias voltage or current to the power amplifier PA.

[0073] The first single-pole single-throw RF switch SW1 is used to control whether the Bluetooth signal is connected to the input terminal of the coupler; the single-pole triple-throw RF switch SW4 is used to control whether the input matching circuit 1211 is connected to the Bluetooth signal or the RF signal; the second single-pole single-throw RF switch SW2 is used to control whether the RF signal is connected to the input terminal of the coupler; the single-pole double-throw RF switch SW5 is used to control whether the antenna terminal ANT is connected to the output terminal of the coupler or to the low-noise amplifier and the third single-pole single-throw RF switch SW3; the third single-pole single-throw RF switch SW3 is used to control whether the antenna terminal ANT is directly connected to the RF signal receiver RX.

[0074] The first and second connection terminals of the single-pole double-throw (SPD-T) RF switch SW5 are used to switch between transmitting and receiving signals. Specifically, the first connection terminal of SPD-T RF switch SW5 is connected to the output terminal of the coupler Coupler, and the second connection terminal of SPD-T RF switch SW5 is connected to the input terminal of the low-noise amplifier and the first connection terminal of the third SPD-T RF switch SW3, respectively. During the transmission phase, the output signal is transmitted to the antenna terminal ANT via the coupler Coupler and the second connection terminal of SPD-T RF switch SW5. The common terminal of SPD-T RF switch SW5 is connected to the antenna terminal ANT.

[0075] The second power supply VDD is used to provide operating power to the first voltage conversion circuit 132 and the second voltage conversion circuit 1421 respectively. The first voltage conversion circuit 132 converts the second power supply VDD to a suitable voltage and outputs it to the bias circuit 1213. The second voltage conversion circuit 1421 converts the second voltage to a suitable voltage and outputs it to the low noise amplifier.

[0076] In the receiving phase of the RF front-end module 100 in this embodiment, the received RF signal or Bluetooth signal enters from the antenna terminal ANT, passes through the single-pole double-throw RF switch SW5 and enters the third integrated circuit, and then passes through the receiving circuit composed of a low-noise amplifier or the third single-pole single-throw RF switch SW3 to transmit the RF signal or Bluetooth signal. The third single-pole single-throw RF switch SW3 acts as a bypass channel or bypass circuit.

[0077] like Figure 1As shown, the first connection terminal of the first single-pole single-throw (SPS) RF switch SW1 can be set to SW1-1, the second connection terminal of the first SPS RF switch SW1 can be set to SW1-2, and the control terminal of the first SPS RF switch SW1 can be set to SW1-3; the first connection terminal of the second SPS RF switch SW2 can be set to SW2-1, the second connection terminal of the second SPS RF switch SW2 can be set to SW2-2, and the control terminal of the first SPS RF switch SW1 can be set to SW2-3; the first connection terminal of the third SPS RF switch SW3 can be set to SW3-1, the second connection terminal of the third SPS RF switch SW3 can be set to SW3-2, and the control terminal of the third SPS RF switch SW3 can be set to SW3-3. -3; Set the first connection terminal of the single-pole triple-throw RF switch SW4 to SW4-1, the second connection terminal of the single-pole triple-throw RF switch SW4 to SW4-2, the third connection terminal of the single-pole triple-throw RF switch SW4 to SW4-3, the common terminal of the single-pole triple-throw RF switch SW4 to S4-4, the first control terminal of the single-pole triple-throw RF switch SW4 to S4-5, and the second control terminal of the single-pole triple-throw RF switch SW4 to S4-6; Set the first connection terminal of the single-pole double-throw RF switch SW5 to S5-1, the second connection terminal of the single-pole double-throw RF switch SW5 to S5-2, the common terminal of the single-pole double-throw RF switch SW5 to S5-3, and the control terminal of the single-pole double-throw RF switch SW5 to S5-4.

[0078] In this embodiment, the RF front-end module 100100 has four modes in the transmission time slot: the first transmission mode is the WIFI power amplification mode, in which S4-4 of the single-pole triple-throw RF switch SW4 is connected to S4-2, and both the first single-pole single-throw RF switch SW1 and the second single-pole single-throw RF switch SW2 are closed or turned off; the second transmission mode is the WIFI transmission pass-through mode, in which S4-4 of the single-pole triple-throw RF switch SW4 is connected to SW-3, the first single-pole single-throw RF switch SW1 is closed, and the second single-pole single-throw RF switch SW2 is open or turned on; the third transmission mode is the Bluetooth power amplification mode, in which S2-4 of the single-pole triple-throw RF switch SW4 is connected to SW-1, and both the first single-pole single-throw RF switch SW1 and the second single-pole single-throw RF switch SW2 are closed; the fourth transmission mode is the Bluetooth transmission pass-through mode, in which S4-4 of the single-pole triple-throw RF switch SW4 is connected to S4-3, the first single-pole single-throw RF switch SW1 is open, and the second single-pole single-throw RF switch SW2 is closed.

[0079] Compared with the prior art, the RF front-end module 100 in this embodiment is designed with a first chip 120, a second chip 130, a third chip 140 and a coupler. The first chip 120 integrates a power amplifier circuit 121 and a resistor, the second chip 130 integrates a logic control circuit 131 and a first voltage conversion circuit 132, and the third chip 140 integrates a first switching circuit 141 and a second switching circuit 142. The connection method of each circuit is also defined, which simplifies the way the RF front-end module 100 controls its transmission power, reduces radiation, lowers energy consumption, and improves the service life of the RF front-end module 100.

[0080] This utility model also provides an embodiment of an RF chip, which includes the RF front-end module 100 in the above embodiments. Since the RF chip in this embodiment includes the RF front-end module 100 in the above embodiments, it can also achieve the technical effects achieved by the RF front-end module 100 in the first embodiment above, and will not be described in detail here.

[0081] It should be noted that the various embodiments described above with reference to the accompanying drawings are only illustrative of the present invention and not intended to limit its scope. Those skilled in the art should understand that any modifications or equivalent substitutions made to the present invention without departing from its spirit and scope should be covered within the scope of the present invention. Furthermore, unless the context otherwise requires, singular terms include plural forms, and vice versa. Additionally, unless specifically stated otherwise, all or part of any embodiment may be used in conjunction with all or part of any other embodiment.

Claims

1. A radio frequency front-end module, characterized in that, The radio frequency front-end module includes a substrate, a first chip, a second chip, a third chip, a coupler, a Bluetooth signal transmitter, a radio frequency signal transmitter, an antenna, a radio frequency signal receiver, and a coupled power output terminal; the first chip, the second chip, the third chip, and the coupler are all fixed to the substrate; the first chip integrates a power amplifier circuit and a resistor, the second chip integrates a logic control circuit and a first voltage conversion circuit, and the third chip integrates a first switching circuit and a second switching circuit; The first input terminal of the power amplifier circuit is used to connect to an external first power source, and the output terminal of the power amplifier circuit is connected to the input terminal of the coupler. The first terminal of the resistor is grounded. The input terminal of the logic control circuit is used to receive externally transmitted level signals, and the output terminal of the logic control circuit is used to output logic control signals according to the received level signals. The first input terminal of the first voltage conversion circuit is connected to an external second power supply, the second input terminal of the first voltage conversion circuit is connected to the output terminal of the logic control circuit, and the output terminal of the first voltage conversion circuit is connected to the second input terminal of the power amplifier circuit. The first input terminal of the first switching circuit is connected to the Bluetooth signal transmitting terminal, the second input terminal of the first switching circuit is connected to the radio frequency signal transmitting terminal, the third input terminal of the first switching circuit is connected to the output terminal of the logic control circuit, the first output terminal of the first switching circuit is connected to the third input terminal of the power amplifier circuit, and the second output terminal of the first switching circuit is connected to the input terminal of the coupler. The first switching circuit is used to control whether the first input terminal of the first switching circuit is connected to the Bluetooth signal transmitting terminal, whether the second input terminal of the first switching circuit is connected to the radio frequency signal transmitting terminal, whether the first output terminal of the first switching circuit is connected to the third input terminal of the power amplifier circuit, and whether the second output terminal of the first switching circuit is connected to the input terminal of the coupler, according to the logic control signal output by the output terminal of the logic control circuit. The control terminal of the second switching circuit is connected to the antenna terminal, the first connection terminal of the second switching circuit is connected to the radio frequency signal receiving terminal, the second connection terminal of the second switching circuit is connected to the output terminal of the coupler, and the input terminal of the second switching circuit is connected to the output terminal of the logic control circuit. The second switching circuit is used to control the control terminal of the second switching circuit to connect to the first connection terminal or the second connection terminal of the second switching circuit according to the logic control signal output by the output terminal of the logic control circuit. The isolation terminal of the coupler is connected to the second terminal of the resistor, and the coupling terminal of the coupler is connected to the coupling power output terminal.

2. The radio frequency front-end module as described in claim 1, characterized in that, The power amplifier circuit includes an input matching circuit, a power amplifier, an output matching circuit, and a bias circuit. The input terminal of the input matching circuit serves as the third input terminal of the power amplifier circuit. The first input terminal of the power amplifier is connected to the output terminal of the input matching circuit, and the second input terminal of the power amplifier serves as the first input terminal of the power amplifier circuit. The input terminal of the output matching circuit is connected to the output terminal of the power amplifier, and the output terminal of the output matching circuit serves as the output terminal of the power amplifier circuit. The input terminal of the bias circuit serves as the second input terminal of the power amplifier circuit, and the output terminal of the bias circuit is connected to the third input terminal of the power amplifier.

3. The radio frequency front-end module as described in claim 2, characterized in that, The power amplifier consists of a multi-stage transistor amplifier circuit.

4. The radio frequency front-end module as described in claim 1, characterized in that, The first switching circuit includes a first single-pole single-throw RF switch, a single-pole triple-throw RF switch, and a second single-pole single-throw RF switch; The first connection terminal of the first single-pole single-throw radio frequency switch is connected to the Bluetooth signal transmitting terminal, the second connection terminal of the first single-pole single-throw radio frequency switch is connected to the input terminal of the coupler, and the control terminal of the first single-pole single-throw radio frequency switch is connected to the output terminal of the logic control circuit, and is used to control the opening or closing of the first single-pole single-throw radio frequency switch according to the logic control signal output by the output terminal of the logic control circuit. The common terminal of the single-pole triple-throw RF switch is connected to the input terminal of the power amplifier circuit. The first connection terminal of the single-pole triple-throw RF switch is connected to the Bluetooth signal transmitter. The second connection terminal of the single-pole triple-throw RF switch is connected to the RF signal transmitter. The third connection terminal of the single-pole triple-throw RF switch is left floating. The first and second control terminals of the single-pole triple-throw RF switch are respectively connected to the output terminal of the logic control circuit. They are used to control the common terminal of the single-pole triple-throw RF switch to connect to one of the first, second, and third connection terminals of the single-pole triple-throw RF switch according to the logic control signal output by the output terminal of the logic control circuit. The first connection terminal of the second single-pole single-throw radio frequency switch is connected to the radio frequency signal transmitting terminal, the second connection terminal of the second single-pole single-throw radio frequency switch is connected to the input terminal of the coupler, and the control terminal of the second single-pole single-throw radio frequency switch is connected to the output terminal of the logic control circuit, and is used to control the opening or closing of the second single-pole single-throw radio frequency switch according to the logic control signal output by the output terminal of the logic control circuit. The first connection terminal of the first single-pole single-throw RF switch and the first connection terminal of the single-pole triple-throw RF switch together serve as the first input terminal of the first switching circuit. The second connection terminal of the single-pole triple-throw RF switch and the first connection terminal of the second single-pole single-throw RF switch together serve as the second input terminal of the first switching circuit. The common terminal of the single-pole triple-throw RF switch serves as the first output terminal of the first switching circuit. The second connection terminal of the first single-pole single-throw RF switch and the second connection terminal of the second single-pole single-throw RF switch together serve as the second output terminal of the first switching circuit. The control terminal of the first single-pole single-throw RF switch, the first control terminal and the second control terminal of the single-pole triple-throw RF switch, and the control terminal of the second single-pole single-throw RF switch together serve as the third input terminal of the first switching circuit.

5. The radio frequency front-end module as described in claim 1, characterized in that, The second switching circuit includes a single-pole double-throw (SPD) RF switch; the common terminal of the SPD RF switch serves as the control terminal of the second switching circuit, the first connection terminal of the SPD RF switch serves as the first connection terminal of the second switching circuit, the second connection terminal of the SPD RF switch serves as the second connection terminal of the second switching circuit, and the control terminal of the SPD RF switch serves as the input terminal of the second switching circuit.

6. The radio frequency front-end module as described in claim 5, characterized in that, The second switching circuit also includes a second voltage conversion circuit and a low-noise amplifier; The first input terminal of the second voltage conversion circuit is used to connect to an external second power supply, and the second input terminal of the second voltage conversion circuit is connected to the output terminal of the logic control circuit. The first input terminal of the low-noise amplifier is connected to the first connection terminal of the single-pole double-throw radio frequency switch, the second input terminal of the low-noise amplifier is connected to the output terminal of the second voltage conversion circuit, and the output terminal of the low-noise amplifier is connected to the radio frequency signal receiving terminal.

7. The radio frequency front-end module as described in claim 6, characterized in that, The second switching circuit further includes a third single-pole single-throw radio frequency switch; the third single-pole single-throw radio frequency switch further includes a first connection terminal connected to a single-pole double-throw radio frequency switch, the second connection terminal of the third single-pole single-throw radio frequency switch is connected to the radio frequency signal receiving terminal, and the control terminal of the third single-pole single-throw radio frequency switch is connected to the output terminal of the logic control circuit, and is used to control the opening or closing of the third single-pole single-throw radio frequency switch according to the logic control signal output by the output terminal of the logic control circuit.

8. The radio frequency front-end module as described in claim 1, characterized in that, The first chip, the second chip, and the third chip are fixedly connected to the substrate by means of silver paste or solder balls.

9. The radio frequency front-end module as described in claim 1, characterized in that, The substrate, the first chip, the second chip, and the third chip are electrically connected by thin metal wires or by solder balls in an upside-down mounting configuration.

10. The radio frequency front-end module as described in claim 1, characterized in that, The first chip is fabricated using GaAs technology; the second chip is fabricated using CMOS technology; and the third chip is fabricated using PHEMT technology or SOI technology.

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