Radio frequency front-end module

Abstract

The invention discloses a radio frequency front-end module. A switch unit group in the radio frequency front-end module comprises at least one bypass switch. The transmitting channel comprises an output matching unit, and the receiving channel comprises an input matching unit. And the transmitting channel is electrically connected with at least one receiving channel through the switch unit group. And the radio frequency front-end module is used for switching the working mode of the radio frequency front-end module to be transmitting channel working or receiving channel working through mutual cooperation of the switch unit group, the input matching unit and the output matching unit. Therefore, the switch unit group comprises at least one bypass switch, the switch unit group is combined with the original input matching unit and output matching unit to realize switching of different channels, and compared with a mode of realizing switching of different channels by adopting a plurality of tandem switches in the prior art, the arrangement number of the tandem switches can be reduced, and the switching efficiency is improved. Therefore, the link insertion loss is improved, and the performance is improved.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of radio frequency technology, and in particular to a radio frequency front-end module. Background Art

[0002] With the continuous development of communication technology, mobile communication terminals have higher and higher performance requirements for RF front-end modules. Among them, the RF power amplifier (RF power amplifier) ​​is an important component of the RF front-end module, and its main technical performance indicators such as bandwidth, gain, loss, linearity, transmission power and efficiency, as well as service life and area size are particularly important.

[0003] Currently, in the RF front end, a single-pole double-throw switch or a single-pole multi-throw switch is used to realize the selection of different signal channels and the isolation between different signal channels. For example, a single-pole double-throw switch is used to realize the selection of a transmitting channel or a receiving channel in the RF front end. However, since the single-pole double-throw switch is equivalent to two series switches respectively arranged in series on the transmitting channel or the receiving channel, the increase of the series switch will increase the link insertion loss, resulting in poor performance of the RF front end. Summary of the invention

[0004] The present invention provides a radio frequency front-end module, which realizes switching of different channels by setting a switch unit group including at least one bypass switch, and combining the switch unit group with an original input matching unit and an output matching unit. Compared with the method of using multiple series switches to realize switching of different channels in the prior art, the number of series switches set can be reduced, thereby achieving improvement in link insertion loss and performance enhancement.

[0005] In a first aspect, an embodiment of the present invention provides a radio frequency front-end module, the radio frequency front-end module comprising a switch unit group, a transmitting channel and at least one receiving channel;

[0006] The switch unit group includes at least one bypass switch, one end of which is electrically connected to the transmitting channel or the receiving channel, and the other end of which is electrically connected to a ground terminal or a preset electrical element;

[0007] The transmitting channel includes an output matching unit, and the receiving channel includes an input matching unit

[0008] The transmitting channel is electrically connected to at least one receiving channel through a switch unit group;

[0009] The RF front-end module is used to switch the working mode of the RF front-end module to the transmitting channel operation or the receiving channel operation through the cooperation of the switch unit group, the input matching unit and the output matching unit.

[0010] Optionally, the switch unit group includes a bypass switch, a series switch and a first inductor;

[0011] The radio frequency front-end module includes a transmitting channel and a receiving channel;

[0012] The bypass switch is arranged between the series switch and the input matching unit;

[0013] The output end of the output matching unit is electrically connected to the first end of the series switch, and the second end of the series switch is electrically connected to the first end of the bypass switch and the input end of the input matching unit respectively;

[0014] The first end of the first inductor is electrically connected to the first end of the series switch, and the second end of the first inductor and the second end of the bypass switch are both electrically connected to the ground.

[0015] Optionally, the RF front-end module is used to switch the working mode of the RF front-end module to the transmission channel when the series switch is disconnected, the bypass switch is closed, and the output matching unit is in a working state;

[0016] Alternatively, the RF front-end module is used to switch the working mode of the RF front-end module to the receiving channel when the series switch is closed, the bypass switch is disconnected, the output matching unit is in the off state, and the input matching unit is in the working state.

[0017] Optionally, the switch unit group includes a bypass switch, a series switch and a first inductor;

[0018] The radio frequency front-end module includes a transmitting channel and a receiving channel;

[0019] The bypass switch is arranged between the series switch and the output matching unit;

[0020] The first end of the bypass switch is electrically connected to the output end of the output matching unit and the first end of the series switch respectively, and the second end of the bypass switch is electrically connected to the ground end;

[0021] The second end of the series switch is electrically connected to the input end of the input matching unit and the first end of the first inductor respectively, and the second end of the first inductor is electrically connected to the ground end.

[0022] Optionally, the RF front-end module is used to switch the working mode of the RF front-end module to the receiving channel working mode when the series switch is disconnected and the bypass switch is closed, and the input matching unit is in a working state;

[0023] Alternatively, the RF front-end module is used to switch the working mode of the RF front-end module to the transmitting channel when the series switch is closed, the bypass switch is disconnected, the input matching unit is in the off state, and the output matching unit is in the working state.

[0024] Optionally, the switch unit group includes a bypass switch, a first inductor and a first capacitor;

[0025] The radio frequency front-end module includes a transmitting channel and a receiving channel;

[0026] The input matching unit includes a second inductor and a first amplifier;

[0027] The bypass switch is arranged between the second inductor and the first amplifier;

[0028] The first end of the first inductor is electrically connected to the output end of the output matching unit and the first end of the second inductor respectively, and the second end of the first inductor is electrically connected to the ground end;

[0029] The second end of the second inductor is electrically connected to the input end of the first amplifier and the first end of the bypass switch respectively, the second end of the bypass switch is electrically connected to the first plate of the first capacitor, and the second plate of the first capacitor is electrically connected to the ground end.

[0030] Optionally, the RF front-end module is used to switch the working mode of the RF front-end module to the transmission channel when the bypass switch is disconnected and the first amplifier is in an off state and the output matching unit is in an operating state;

[0031] Alternatively, the RF front-end module is used to switch the working mode of the RF front-end module to the receiving channel when the bypass switch is closed and the output matching unit is in the off state and the first amplifier is in the working state.

[0032] Optionally, the switch unit group includes two bypass switches, a series switch, a first inductor and a first capacitor, and the two bypass switches include a first bypass switch and a second bypass switch;

[0033] The RF front-end module includes a transmitting channel and two receiving channels, the two receiving channels include a first receiving channel and a second receiving channel, the first receiving channel includes a first input matching unit, and the second receiving channel includes a second input matching unit;

[0034] The first input matching unit includes a second inductor and a first amplifier, and the first bypass switch is arranged between the second inductor and the first amplifier;

[0035] The second bypass switch is arranged between the series switch and the second input matching unit;

[0036] The first end of the first inductor is electrically connected to the output end of the output matching unit and the first end of the series switch respectively, the second end of the series switch is electrically connected to the input end of the second input matching unit and the first end of the second bypass switch respectively, and the second end of the second inductor and the second end of the second bypass switch are both electrically connected to the ground end;

[0037] The output end of the output matching unit is also electrically connected to the first end of the second inductor, the second end of the second inductor is electrically connected to the first end of the first bypass switch and the input end of the first amplifier respectively, the second end of the first bypass switch is electrically connected to the first plate of the first capacitor, and the second plate of the first capacitor is electrically connected to the ground end.

[0038] Optionally, the RF front-end module is used to switch the working mode of the RF front-end module to the transmission channel when the series switch is disconnected, the first bypass switch is disconnected, the second bypass switch is closed, the first input matching unit is in an off state, and the output matching unit is in an on state;

[0039] Or the RF front-end module is used to switch the working mode of the RF front-end module to work on the second receiving channel when the series switch is closed, the first bypass switch is opened, the second bypass switch is opened, the output matching unit and the first input matching unit are both in a closed state, and the second input matching unit is in a working state;

[0040] Alternatively, the RF front-end module is used to switch the operating mode of the RF front-end module to operate on the first receiving channel when the series switch is disconnected, the first bypass switch is closed, the second bypass switch is closed, the output matching unit is in an off state, and the first input matching unit is in an operating state.

[0041] Optionally, the input matching unit includes a first amplifier, a second inductor, a second capacitor and a third capacitor;

[0042] The second inductor is arranged in series between the switch unit group and the first amplifier;

[0043] The second capacitor is arranged in parallel at the first end of the second inductor, and the third capacitor is arranged in parallel at the second end of the second inductor;

[0044] The output matching unit includes a second amplifier, a third amplifier and a fourth capacitor;

[0045] The output end of the second amplifier is electrically connected to the input end of the third amplifier, the output end of the third amplifier is electrically connected to the switch unit group, and the fourth capacitor is arranged in parallel with the output end of the third amplifier.

[0046] In summary, the switch unit group in the RF front-end module of the embodiment of the present invention includes at least one bypass switch. The transmitting channel includes an output matching unit, and the receiving channel includes an input matching unit. The transmitting channel is electrically connected to at least one receiving channel through the switch unit group. The RF front-end module is used to switch the working mode of the RF front-end module to the transmitting channel operation or the receiving channel operation according to the switch unit group, the input matching unit and the output matching unit. In this way, the switch unit group includes at least one bypass switch, and the switching of different channels is realized by combining the switch unit group with the original input matching unit and the output matching unit. Compared with the method of using multiple series switches to realize the switching of different channels in the prior art, the number of series switches set can be reduced, thereby achieving the improvement of link insertion loss and performance improvement. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 is a simplified structural diagram of a radio frequency front-end module provided by an embodiment of the present invention;

[0048] Figure 2 is a circuit diagram of a working process of a radio frequency front-end module provided by an embodiment of the present invention;

[0049] Figure 3 is a circuit diagram of another working process of a radio frequency front-end module provided by an embodiment of the present invention;

[0050] Figure 4 is a simplified structural diagram of another radio frequency front-end module provided by an embodiment of the present invention;

[0051] Figure 5 is a circuit diagram of another working process of a radio frequency front-end module provided by an embodiment of the present invention;

[0052] Figure 6 is a circuit diagram of another working process of a radio frequency front-end module provided by an embodiment of the present invention;

[0053] Figure 7 is a circuit diagram of another working process of a radio frequency front-end module provided by an embodiment of the present invention;

[0054] Figure 8 is a circuit diagram of another working process of a radio frequency front-end module provided by an embodiment of the present invention;

[0055] Fig. 9 This is a circuit diagram of another working process of a radio frequency front-end module provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0056] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0057] Figure 1 is a schematic diagram of a multi-channel output radio frequency amplifier provided by an embodiment of the present invention, see Figure 1 The RF front-end module includes a switch unit group 10, a transmitting channel 20 and at least one receiving channel 30. The switch unit group 10 includes at least one bypass switch 110. The transmitting channel 20 includes an output matching unit 210, and the receiving channel 30 includes an input matching unit 310. The transmitting channel 20 is electrically connected to at least one receiving channel 30 through the switch unit group 10. The RF front-end module is used to switch the working mode of the RF front-end module to the transmitting channel 20 working or the receiving channel 30 working according to the switch unit group 10, the input matching unit 310 and the output matching unit 210.

[0058] For details, see Figure 1 The transmitting channel 20 includes an output matching unit 210. The output matching unit 210 may include a power amplifier and an output matching unit of a corresponding power amplifier, and then the RF signal is sent through the output matching unit 210. The receiving channel 30 includes an input matching unit 310. The input matching unit 310 may include a low noise amplifier input matching unit and a low noise amplifier, and then the RF signal is received through the input matching unit 310. It should be noted that Figure 1 The RF front-end module includes a transmitting channel 20 and a receiving channel 30 as an example, but this is not limited to this. In other embodiments, the RF front-end module may also include a transmitting channel 20 and multiple receiving channels 30, and technical personnel in this field can set them as needed.

[0059] In the prior art, in order to realize the switching of the transmitting channel and the receiving channel, a single-pole double-throw switch is usually set between the transmitting channel and the receiving channel. The single-pole double-throw switch is equivalent to two series switches, which are respectively set in series on the transmitting channel and the receiving channel. When the series switch set on the transmitting channel is closed, the transmitting channel transmits the radio frequency signal, and when the series switch set on the receiving channel is closed, the receiving channel receives the radio frequency signal. However, since the series switches are set on both the transmitting channel and the receiving channel, the setting of the series switches will increase the link insertion loss, thereby resulting in poor performance of the RF front-end module.

[0060] To this end, the embodiment of the present invention reduces the number of series switches 120 in the RF front-end module by setting the switch unit group 10 to include at least one bypass switch 110, thereby reducing the link insertion loss. Specifically, the bypass switch 110 can be a switch arranged in parallel in the circuit, and the series switch 120 is a switch arranged in series in the circuit, and the roles played by the two are not the same. Among them, the main function of the series switch 120 is to achieve the conduction of a certain signal path, while the bypass switch 110 mainly plays the role of increasing isolation or adjusting impedance in the circuit, so the link insertion loss caused by the setting of the bypass switch 110 is relatively small. In addition, it should be noted that one end of the bypass switch 110 is connected to the circuit, and the other end can be electrically connected to the ground terminal, or can be electrically connected to a preset electrical element (such as a capacitor, etc.). The embodiment of the present invention is not limited to this, and those skilled in the art can set it as needed. In summary, in the embodiment of the present invention, a series switch 120 can be used to cooperate with the state information (working state or closed state) of the output matching unit 210 and the state information (working state or closed state) of the input matching unit 310, and combined with the assistance of the bypass switch 110 (increasing isolation or adjusting impedance) to achieve the switching of different signal channels. It should be noted that in other embodiments, the series switch 120 may not be set, and the switching of different signal channels may be achieved only by outputting the state information (working state or closed state) of the matching unit 210 and the state information (working state or closed state) of the input matching unit 310, and combined with the assistance of the bypass switch 110 (increasing isolation or adjusting impedance). In this way, in the embodiment of the present invention, the number of series switches 120 can be reduced, and the switching of different signal channels can be achieved even without the series switch 120. Compared with the method of using multiple series switches to achieve the switching of different channels in the prior art, the number of series switches can be reduced, thereby achieving the improvement of link insertion loss and performance improvement.

[0061] It should be noted that Figure 1 The structural diagram shown is only used as an example to illustrate one transmitting channel 20, one receiving channel 30, one series switch 120 and one bypass switch 110, but it is not limited to this. In other embodiments, there may be one transmitting channel 20, one receiving channel 30, and one bypass switch 110, or there may be one transmitting channel 20, multiple receiving channels 30, one series switch 120 and one bypass switch 110, etc., and those skilled in the art can set it as needed.

[0062] In summary, the switch unit group in the RF front-end module of the embodiment of the present invention includes at least one bypass switch. The transmitting channel includes an output matching unit, and the receiving channel includes an input matching unit. The transmitting channel is electrically connected to at least one receiving channel through the switch unit group. The RF front-end module is used to switch the working mode of the RF front-end module to the transmitting channel operation or the receiving channel operation through the cooperation of the switch unit group, the input matching unit and the output matching unit. In this way, the switch unit group includes at least one bypass switch, and the switching of different channels is realized by combining the switch unit group with the original input matching unit and the output matching unit. Compared with the method of using multiple series switches to realize the switching of different channels in the prior art, the number of series switches set can be reduced, thereby achieving improvement in link insertion loss and performance improvement.

[0063] Optionally, based on the above embodiment, Figure 2 is a circuit diagram of a working process of a radio frequency front-end module provided by an embodiment of the present invention, Figure 3 1 is a circuit diagram of another working process of a radio frequency front-end module provided by an embodiment of the present invention. Figure 2 and Figure 3 , the switch unit group 10 includes a bypass switch 110, a series switch 120 and a first inductor R1. The RF front-end module includes a transmitting channel 20 and a receiving channel 30. The bypass switch 110 is arranged between the series switch 120 and the input matching unit 310. The output end of the output matching unit 210 is electrically connected to the first end of the series switch 120, and the second end of the series switch 120 is electrically connected to the first end of the bypass switch 110 and the input end of the input matching unit 310. The first end of the first inductor R1 is electrically connected to the first end of the series switch 120, and the second end of the first inductor R1 and the second end of the bypass switch 110 are both electrically connected to the ground end.

[0064] Specifically, Figure 2 and Figure 3 In the illustrated implementation manner, an RF front-end module including a transmitting channel and a receiving channel is used as an example for explanation. In addition, the switch unit group 10 includes a bypass switch 110, a series switch 120 and a first inductor R1. The bypass switch 110 is arranged between the series switch 120 and the input matching unit 310, and the first end of the series switch 120 is electrically connected to the first end of the first inductor R1, and the second end of the series switch 120 is electrically connected to the input end of the input matching unit 310. That is to say, in the embodiment of the present invention, the series switch 120 and the bypass switch 110 are both arranged on the receiving channel 30, while the series switch 120 and the bypass switch 110 are not arranged on the transmitting channel 20, but the output matching unit 210 is directly electrically connected to the first end of the first inductor R1. In this way, see Figure 2When the series switch 120 is disconnected, the receiving channel 30 is in a disconnected state. If the output matching unit of the transmitting channel 20 is in a working state, the RF front-end module is switched to the transmitting channel 20 to work. Since the second end of the bypass switch 110 is electrically connected to the ground end, and the bypass switch 110 is arranged in parallel with the second end of the series switch 120, when the transmitting channel 20 transmits the RF signal, the bypass switch 110 is closed. The bypass switch 110 is used to increase the isolation and avoid the influence of the receiving channel 30. That is, the RF front-end module is used to switch the working mode of the RF front-end module to the transmitting channel 20 when the series switch 120 is disconnected, the bypass switch 110 is closed, and the output matching unit 210 is in a working state.

[0065] Also, see Figure 3 When the series switch 120 is closed, the receiving channel 30 and the transmitting channel 20 are both in the on state. By setting the output matching unit 210 in the off state and the input matching unit 310 in the working state, the impedance of the output matching unit 210 is close to an open circuit, that is, the transmitting channel 20 is disconnected and the receiving channel 30 is turned on. Since the bypass switch 110 is set on the receiving channel 30, when the receiving channel 30 is turned on, the bypass switch 110 needs to be set to be disconnected to avoid affecting the normal operation of the receiving channel 30, that is, the RF front-end module is used to switch the working mode of the RF front-end module to the receiving channel 30 when the series switch 120 is closed, the bypass switch 110 is disconnected, the output matching unit 210 is in the off state, and the input matching unit 310 is in the working state. In this way, Figure 2 and Figure 3 In the illustrated embodiment, the series switch 120 and the bypass switch 110 are both arranged on the receiving channel 30, and the series switch 120 and the bypass switch 110 are not arranged on the transmitting channel 20. Therefore, the performance on the receiving channel 30 remains unchanged, and the number of series switches 120 on the transmitting channel 20 is reduced, thereby reducing the link insertion loss and improving the performance of the transmitting channel 20.

[0066] It should be noted that see Figure 2 and Figure 3 The input matching unit 310 includes a first amplifier U1, a second inductor R2, a second capacitor C2 and a third capacitor C3. The second inductor R2 is arranged in series between the switch unit group 10 and the first amplifier U1. The second capacitor C2 is arranged in parallel at the first end of the second inductor R2, and the third capacitor C3 is arranged in parallel at the second end of the second inductor R2. The output matching unit 210 includes a second amplifier U2, a third amplifier U3 and a fourth capacitor C4. The output end of the second amplifier U2 is electrically connected to the input end of the third amplifier U3, the output end of the third amplifier U3 is electrically connected to the switch unit group 10, and the fourth capacitor C4 is arranged in parallel at the output end of the third amplifier U3. It can be understood that, as Figure 2 and Figure 3 As shown, the transmitting channel 20 and the receiving channel 30 are also provided with other electrical components to ensure the normal operation of the transmitting channel 20 and the receiving channel 30, which will not be described in detail in the present invention.

[0067] As described above, the circuit connection relationship is as follows: Figure 3 As shown, when the RF front-end module is switched to work in the receiving channel 30 (the series switch 120 is closed, the bypass switch 110 is disconnected, the output matching unit 210 is in the off state, and the input matching unit 310 is in the working state), since the output matching unit 210 is in the off state, the output matching unit 210 presents a specific impedance ZX. The input matching unit 310 can incorporate the impedance ZX of the output matching unit 210 to achieve unified matching and optimization. By adjusting the parameters or topology of the original input matching unit 310, the impedance matching target can be achieved under the new impedance conditions. Exemplarily, when the RF front-end module switches to work on the receiving channel 30, assuming that the impedance ZX of the output matching unit 210 is equivalent to the capacitance of the fourth capacitor C4 (C4=6.1pF), the original parameter values ​​in the input matching unit 310 include the second capacitor C2 of 3.82 pF, the second inductor R2 of 1.67nH, and the third capacitor C3 of 4.75 pF. Then, after the input matching unit 310 incorporates the impedance ZX of the output matching unit 210 and readjusts it, the parameter values ​​of the input matching unit 310 include the second capacitor C2 of 0 pF, the second inductor R2 of 1.12nH, and the third capacitor C3 of 7.8 pF. At this time, the fourth capacitor C4 is incorporated into the input matching unit 310 to replace the second capacitor C2 to complete the impedance matching. In this way, when one series switch 120 is reduced (the transmitting channel 20 is not provided with a series switch), combined with the topology optimization and parameter adjustment of the matching network, it is ensured that each signal channel can still achieve its own impedance matching.

[0068] Optionally, based on the above embodiment, Figure 4 FIG. 1 is a simplified structural diagram of another RF front-end module provided by an embodiment of the present invention. Figure 4 , the switch unit group 10 includes a bypass switch 110, a series switch 120 and a first inductor R1. The RF front-end module includes a transmitting channel 20 and a receiving channel 30. The bypass switch 110 is arranged between the series switch 120 and the output matching unit 210. The first end of the bypass switch 110 is electrically connected to the output end of the output matching unit 210 and the first end of the series switch 120, respectively, and the second end of the bypass switch 110 is electrically connected to the ground end. The second end of the series switch 120 is electrically connected to the input end of the input matching unit 310 and the first end of the first inductor R1, respectively, and the second end of the first inductor R1 is electrically connected to the ground end.

[0069] like Figure 4In the illustrated embodiment, the RF front-end module includes a transmitting channel and a receiving channel as an example for explanation. In addition, the switch unit group 10 includes a bypass switch 110, a series switch 120 and a first inductor R1. The bypass switch 110 is arranged between the series switch 120 and the output matching unit 210, and the first end of the series switch 120 is electrically connected to the output end of the output matching unit 210, and the second end of the series switch 120 is electrically connected to the first end of the first inductor R1. That is to say, in the embodiment of the present invention, the series switch 120 and the bypass switch 110 are both arranged on the transmitting channel 20, while the series switch 120 and the bypass switch 110 are not arranged on the receiving channel 30, but the input end of the input matching unit 310 is directly electrically connected to the first end of the first inductor R1. In this way, when the series switch 120 is disconnected, the transmitting channel 20 is in a disconnected state (regardless of whether the output matching unit 210 is in a closed state or in a working state, the transmitting channel 20 is disconnected). If the input matching unit 310 of the receiving channel 30 is in a working state, the RF front-end module switches to the receiving channel 30 to receive the RF signal. Since the second end of the bypass switch 110 is electrically connected to the ground end, and the bypass switch 110 is arranged in parallel on the transmitting channel 20, when the receiving channel 30 receives the RF signal, the bypass switch 110 is closed. The bypass switch 110 is used to increase the isolation and avoid the influence of the transmitting channel 20. That is, the RF front-end module is used to switch the working mode of the RF front-end module to the receiving channel 30 when the series switch 120 is disconnected, the bypass switch 110 is closed, and the input matching unit 310 is in a working state.

[0070] In addition, when the series switch 120 is closed, the receiving channel 30 and the transmitting channel 20 are both in the on state. By setting the input matching unit 310 in the off state and the output matching unit 210 in the working state, the impedance of the input matching unit 310 is close to an open circuit, that is, the receiving channel 30 is disconnected and the transmitting channel 20 is on. Since the bypass switch 110 is set on the transmitting channel 20, when the transmitting channel 20 is on, the bypass switch 110 needs to be set to be disconnected to avoid affecting the normal operation of the transmitting channel 20, that is, the RF front-end module is used to switch the working mode of the RF front-end module to the transmitting channel 20 when the series switch 120 is closed, the bypass switch 110 is disconnected, the input matching unit 310 is in the off state, and the output matching unit 210 is in the working state. In this way, Figure 2 and Figure 3 In the illustrated embodiment, the series switch 120 and the bypass switch 110 are both arranged on the transmitting channel 20, and the series switch 120 and the bypass switch 110 are not arranged on the receiving channel 30. Therefore, the performance on the transmitting channel 20 remains unchanged, and the number of series switches 120 on the receiving channel 30 is reduced, thereby reducing the link insertion loss and improving the performance of the receiving channel 30.

[0071] Optionally, in yet another embodiment, Figure 5 is a circuit diagram of another working process of a radio frequency front-end module provided by an embodiment of the present invention, Figure 6 is a circuit diagram of another working process of a radio frequency front-end module provided by an embodiment of the present invention. Figure 5 and Figure 6 , the switch unit group 10 includes a bypass switch 110, a first inductor R1 and a first capacitor C1. The RF front-end module includes a transmitting channel 20 and a receiving channel 30. The input matching unit 310 includes a second inductor R2 and a first amplifier U1. The bypass switch 110 is arranged in parallel between the second inductor R2 and the first amplifier U1. The first end of the first inductor R1 is electrically connected to the output end of the output matching unit 210 and the first end of the second inductor R2, respectively, and the second end of the first inductor R1 is electrically connected to the ground end. The second end of the second inductor R2 is electrically connected to the input end of the first amplifier U1 and the first end of the bypass switch 110, respectively, the second end of the bypass switch 110 is electrically connected to the first plate of the first capacitor C1, and the second plate of the first capacitor C1 is electrically connected to the ground end.

[0072] like Figure 5 and Figure 6 In the illustrated embodiment, an RF front-end module including a transmitting channel 20 and a receiving channel 30 is used as an example for explanation. In addition, the switch unit group 10 includes a bypass switch 110, a first inductor R1, and a first capacitor C1. It can be understood that in the embodiment of the present invention, the second end of the bypass switch 110 is electrically connected to the first capacitor C1, that is, the function of the bypass switch 110 in the embodiment of the present invention is mainly to adjust the impedance and achieve impedance matching. Specifically, the switch unit group 10 is not provided with a series switch, that is, in the embodiment of the present invention, the status information of the output matching unit 210 and the status information of the input matching unit 310 are set, and combined with the impedance adjustment of the bypass switch 110, to achieve switching of different signal channels. For example, see Figure 5 When the first amplifier U1 in the input matching unit 310 is in the off state and the output matching unit 210 is in the working state, the RF front-end module switches to the transmitting channel 20 to transmit the RF signal. Since the second end of the bypass switch 110 is electrically connected to the first capacitor C1, and the bypass switch 110 is arranged in parallel on the receiving channel 30, when the transmitting channel 20 sends the RF signal, there is no need to adjust the impedance of the receiving channel 30, then the bypass switch 110 is disconnected, that is, the RF front-end module is used to switch the working mode of the RF front-end module to the transmitting channel 20 when the bypass switch 110 is disconnected and the first amplifier U1 is in the off state and the output matching unit 210 is in the working state.

[0073] Also, see Figure 6, when the output matching unit 210 in the transmitting channel 20 is in the off state and the first amplifier U1 is in the working state, the RF front-end module switches to the receiving channel 30 to receive the RF signal. Since the second end of the bypass switch 110 is electrically connected to the first capacitor C1, and the bypass switch 110 is arranged in parallel on the receiving channel 30, when the receiving channel 30 receives the RF signal, it is necessary to adjust the impedance of the receiving channel 30 through the bypass switch 110, then the bypass switch 110 is closed, that is, the RF front-end module is used to switch the working mode of the RF front-end module to the receiving channel 30 when the bypass switch 110 is closed and the output matching unit 210 is in the off state and the first amplifier U1 is in the working state. In this way, Figure 5 and Figure 6 In the illustrated embodiment, no series switch 120 is provided on the receiving channel 30 and the transmitting channel 20 , which further reduces the number of series switches 120 , thereby reducing link insertion loss and improving the performance of the transmitting channel 20 and the receiving channel 30 .

[0074] It should be noted that Figure 5 and Figure 6 The bypass switch 110 is set on the receiving channel 30 for illustration only, but this is not limiting. In other embodiments, the bypass switch 110 can also be set on the transmitting channel 20, or two bypass switches 110 can be set on the receiving channel 30 and the transmitting channel 20 respectively. Those skilled in the art can set them as needed.

[0075] Optional, Figure 7 is a circuit diagram of another working process of a radio frequency front-end module provided by an embodiment of the present invention, Figure 8 is a circuit diagram of another working process of a radio frequency front-end module provided by an embodiment of the present invention, Fig. 9 is a circuit diagram of another working process of a radio frequency front-end module provided by an embodiment of the present invention. Figure 7-Figure 9The switch unit group 10 includes two bypass switches 110, a series switch 120, a first inductor R1 and a first capacitor C1. The two bypass switches 110 include a first bypass switch 111 and a second bypass switch 112. The RF front-end module includes a transmitting channel 20 and two receiving channels 30. The two receiving channels 30 include a first receiving channel 301 and a second receiving channel 302. The first receiving channel 301 includes a first input matching unit 311, and the second receiving channel 302 includes a second input matching unit 312. The first input matching unit 311 includes a second inductor R2 and a first amplifier U1. The first bypass switch 111 is arranged between the second inductor R2 and the first amplifier U1. The second bypass switch 112 is arranged between the series switch 120 and the second input matching unit 312. The first end of the first inductor R1 is electrically connected to the output end of the output matching unit 210 and the first end of the series switch 120, respectively. The second end of the series switch 120 is electrically connected to the input end of the second input matching unit 312 and the first end of the second bypass switch 112, respectively. The second end of the second inductor R2 and the second end of the second bypass switch 112 are both electrically connected to the ground. The output end of the output matching unit 210 is also electrically connected to the first end of the second inductor R2, the second end of the second inductor R2 is electrically connected to the first end of the first bypass switch 111 and the input end of the first amplifier U1, the second end of the first bypass switch 111 is electrically connected to the first plate of the first capacitor C1, and the second plate of the first capacitor C1 is electrically connected to the ground.

[0076] like Figure 7-Figure 9 In the illustrated embodiment, the RF front-end module includes a transmitting channel 20 and two receiving channels 30 as an example for explanation. In addition, the switch unit group 10 includes a first bypass switch 111, a second bypass switch 112, a series switch 120, a first inductor R1 and a first capacitor C1. It can be understood that in the embodiment of the present invention, the second end of the first bypass switch 111 is electrically connected to the first capacitor C1, that is, the function of the first bypass switch 111 is mainly to adjust the impedance and achieve impedance matching, and the second end of the second bypass switch 112 is electrically connected to the ground end, that is, the function of the second bypass switch 112 is mainly to increase isolation. Specifically, in the embodiment of the present invention, a series switch 120 is used to cooperate with the state information (working state or closed state) of the output matching unit 210 and the state information (working state or closed state) of the input matching unit 310, and combined with the assistance of the bypass switch 110 (increasing isolation or adjusting impedance) to achieve switching of different signal channels.

[0077] For example, see Figure 7When the series switch 120 is in the disconnected state, since the series switch 120 is set on the second receiving channel 302, the second receiving channel 302 is closed, and the second bypass switch 112 is set to be closed to increase isolation. On this basis, by setting the output matching unit 210 in the working state and the first input matching unit 311 in the closed state, the RF front-end module is switched to the transmitting channel 20 to transmit the RF signal. Since the first bypass switch 111 is set in parallel on the first receiving channel 301, when the transmitting channel 20 sends the RF signal, there is no need to adjust the impedance of the first receiving channel 301, then the first bypass switch 111 is disconnected, that is, the RF front-end module is used to switch the working mode of the RF front-end module to the transmitting channel 20 when the series switch 120 is disconnected, the first bypass switch 111 is disconnected, the second bypass switch 112 is closed, and the first input matching unit 311 is in the closed state, and the output matching unit 210 is in the working state.

[0078] And as Figure 8 As shown, when the series switch 120 is in a closed state, the transmitting channel 20 and the second receiving channel 302 are both in a conducting state. On this basis, by setting the output matching unit 210 to be in a closed state and the first input matching unit 311 to be in a closed state, the RF front-end module is switched to the second receiving channel 302 to receive the RF signal. Since the second bypass switch 112 is arranged in parallel on the second receiving channel 302 and the first bypass switch 111 is arranged on the first receiving channel 301, when the second receiving channel 302 receives the RF signal, it is necessary to set the second bypass switch 112 to be disconnected (no need to increase the isolation through the second bypass switch 112), and the first bypass switch 111 to be disconnected (no need to adjust the impedance of the first receiving channel 301), that is, the RF front-end module is used to switch the working mode of the RF front-end module to work on the second receiving channel 302 when the series switch 120 is closed, the first bypass switch 111 is disconnected, the second bypass switch 112 is disconnected, and the output matching unit 210 and the first input matching unit 311 are both in the closed state, and the second input matching unit 312 is in the working state.

[0079] like Fig. 9As shown, when the series switch 120 is in the disconnected state, since the series switch 120 is set on the second receiving channel 302, the second receiving channel 302 is closed, and the second bypass switch 112 is set to be closed to increase isolation. On this basis, by setting the output matching unit 210 in the closed state and the first input matching unit 311 in the working state, the RF front-end module is switched to the first receiving channel 301 to receive the RF signal. Since the first bypass switch 111 is set on the first receiving channel 301, when the first receiving channel 301 receives the RF signal, it is necessary to set the first bypass switch 111 to be closed to adjust the impedance, that is, the RF front-end module is used to switch the working mode of the RF front-end module to the first receiving channel 301 when the series switch 120 is disconnected, the first bypass switch 111 is closed, the second bypass switch 112 is closed, and the output matching unit 210 is in the closed state and the first input matching unit 311 is in the working state. Thus, in an embodiment of the present invention, when a plurality of receiving channels are provided, a series switch 120 is used to coordinate the status information (working status or shut-down status) of the output matching unit 210 and the status information (working status or shut-down status) of the input matching unit 310, and combined with the assistance of the bypass switch 110 (increasing isolation or adjusting impedance), while achieving switching of different signal channels, the number of series switches set is reduced, thereby achieving improvement in link insertion loss and performance enhancement.

[0080] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A radio frequency front-end module, characterized in that: The RF front-end module includes a switch unit group, a transmitting channel and at least one receiving channel; The switch unit group includes at least one bypass switch, one end of the bypass switch is electrically connected to the transmitting channel or the receiving channel, and the other end is electrically connected to the ground terminal or to a preset electrical element, wherein when the other end of the bypass switch is electrically connected to the ground terminal, the bypass switch is used to increase isolation, and when the other end of the bypass switch is electrically connected to the preset electrical element, the bypass switch is used to adjust impedance; The transmitting channel includes an output matching unit, and the receiving channel includes an input matching unit The transmitting channel is electrically connected to at least one receiving channel through a switch unit group; The RF front-end module is used to switch the working mode of the RF front-end module to the transmitting channel operation or the receiving channel operation through the cooperation of the switch unit group, the input matching unit and the output matching unit.

2. The RF front-end module according to claim 1, characterized in that: The switch unit group includes a bypass switch, a series switch and a first inductor; The radio frequency front-end module includes a transmitting channel and a receiving channel; The bypass switch is arranged between the series switch and the input matching unit; The output end of the output matching unit is electrically connected to the first end of the series switch, and the second end of the series switch is electrically connected to the first end of the bypass switch and the input end of the input matching unit respectively; The first end of the first inductor is electrically connected to the first end of the series switch, and the second end of the first inductor and the second end of the bypass switch are both electrically connected to the ground.

3. The RF front-end module according to claim 2, characterized in that: The RF front-end module is used to switch the working mode of the RF front-end module to the transmission channel when the series switch is disconnected, the bypass switch is closed, and the output matching unit is in a working state; Alternatively, the RF front-end module is used to switch the working mode of the RF front-end module to the receiving channel when the series switch is closed, the bypass switch is disconnected, the output matching unit is in the off state, and the input matching unit is in the working state.

4. The RF front-end module according to claim 1, characterized in that: The switch unit group includes a bypass switch, a series switch and a first inductor; The radio frequency front-end module includes a transmitting channel and a receiving channel; The bypass switch is arranged between the series switch and the output matching unit; The first end of the bypass switch is electrically connected to the output end of the output matching unit and the first end of the series switch respectively, and the second end of the bypass switch is electrically connected to the ground end; The second end of the series switch is electrically connected to the input end of the input matching unit and the first end of the first inductor respectively, and the second end of the first inductor is electrically connected to the ground end.

5. The RF front-end module according to claim 4, characterized in that: The RF front-end module is used to switch the working mode of the RF front-end module to the receiving channel working mode when the series switch is disconnected and the bypass switch is closed, and the input matching unit is in a working state; Alternatively, the RF front-end module is used to switch the working mode of the RF front-end module to the transmitting channel when the series switch is closed, the bypass switch is disconnected, the input matching unit is in the off state, and the output matching unit is in the working state.

6. The RF front-end module according to claim 1, characterized in that: The switch unit group includes a bypass switch, a first inductor and a first capacitor; The radio frequency front-end module includes a transmitting channel and a receiving channel; The input matching unit includes a second inductor and a first amplifier; The bypass switch is arranged between the second inductor and the first amplifier; The first end of the first inductor is electrically connected to the output end of the output matching unit and the first end of the second inductor respectively, and the second end of the first inductor is electrically connected to the ground end; The second end of the second inductor is electrically connected to the input end of the first amplifier and the first end of the bypass switch respectively, the second end of the bypass switch is electrically connected to the first plate of the first capacitor, and the second plate of the first capacitor is electrically connected to the ground end.

7. The radio frequency front-end module according to claim 6, characterized in that: The RF front-end module is used for switching the working mode of the RF front-end module to the transmission channel working mode when the bypass switch is disconnected and the first amplifier is in the off state and the output matching unit is in the working state; Alternatively, the RF front-end module is used to switch the working mode of the RF front-end module to the receiving channel when the bypass switch is closed and the output matching unit is in the off state and the first amplifier is in the working state.

8. The radio frequency front-end module according to claim 1, characterized in that: The switch unit group includes two bypass switches, a series switch, a first inductor and a first capacitor, and the two bypass switches include a first bypass switch and a second bypass switch; The RF front-end module includes a transmitting channel and two receiving channels, the two receiving channels include a first receiving channel and a second receiving channel, the first receiving channel includes a first input matching unit, and the second receiving channel includes a second input matching unit; The first input matching unit includes a second inductor and a first amplifier, and the first bypass switch is arranged between the second inductor and the first amplifier; The second bypass switch is arranged between the series switch and the second input matching unit; The first end of the first inductor is electrically connected to the output end of the output matching unit and the first end of the series switch respectively, the second end of the series switch is electrically connected to the input end of the second input matching unit and the first end of the second bypass switch respectively, and the second end of the second inductor and the second end of the second bypass switch are both electrically connected to the ground end; The output end of the output matching unit is also electrically connected to the first end of the second inductor, the second end of the second inductor is electrically connected to the first end of the first bypass switch and the input end of the first amplifier respectively, the second end of the first bypass switch is electrically connected to the first plate of the first capacitor, and the second plate of the first capacitor is electrically connected to the ground end.

9. The radio frequency front-end module according to claim 8, characterized in that: The RF front-end module is used to switch the working mode of the RF front-end module to the transmission channel when the series switch is disconnected, the first bypass switch is disconnected, the second bypass switch is closed, the first input matching unit is in an off state, and the output matching unit is in an on state; Or the RF front-end module is used to switch the working mode of the RF front-end module to work on the second receiving channel when the series switch is closed, the first bypass switch is opened, the second bypass switch is opened, the output matching unit and the first input matching unit are both in a closed state, and the second input matching unit is in a working state; Alternatively, the RF front-end module is used to switch the operating mode of the RF front-end module to operate on the first receiving channel when the series switch is disconnected, the first bypass switch is closed, the second bypass switch is closed, the output matching unit is in an off state, and the first input matching unit is in an operating state.

10. The radio frequency front-end module according to claim 2, characterized in that: The input matching unit includes a first amplifier, a second inductor, a second capacitor and a third capacitor; The second inductor is arranged in series between the switch unit group and the first amplifier; The second capacitor is arranged in parallel at the first end of the second inductor, and the third capacitor is arranged in parallel at the second end of the second inductor; The output matching unit includes a second amplifier, a third amplifier and a fourth capacitor; The output end of the second amplifier is electrically connected to the input end of the third amplifier, the output end of the third amplifier is electrically connected to the switch unit group, and the fourth capacitor is arranged in parallel with the output end of the third amplifier.

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