Low noise amplifier with wideband high performance bypass and radio frequency front end module

Abstract

The application provides a low-noise amplifier and a radio frequency front end module with wideband high-performance bypass, the low-noise amplifier comprises an input matching module, an input amplification module, an output matching and bypass module and an input bypass module, the bypass of the low-noise amplifier can reasonably select the combination of output inductance and capacitance to offset the influence of parasitic capacitance on the output end of the radio frequency system, better bypass performance is achieved, noise and gain loss are not brought to the main amplification branch, meanwhile, more circuit area is not introduced, and the low-noise amplifier is more beneficial to use in the existing power amplifier system.

Description

Technical Field

[0001] This invention relates to the field of radio frequency front-end technology, and particularly to a low-noise amplifier and radio frequency front-end module with broadband high-performance bypass. Background Technology

[0002] In radio frequency (RF) communication systems, the RF front-end module is the core unit for signal reception and transmission, and the low-noise amplifier (LNOA), as the first-stage active device in the RF front-end system, plays a crucial role. Its main function is to receive and amplify the weak RF signals transmitted by the antenna, while simultaneously possessing a certain level of noise suppression capability and a sufficiently low noise level to ensure the system's receiving sensitivity meets communication requirements. To cope with scenarios with high received power and prevent damage to back-end circuits due to signal overload, LNOA typically includes a bypass branch. This branch activates under high received power conditions, providing low gain or even negative gain to achieve power regulation of the received signal and protection of the back-end circuits. It is an important component for LNOA to achieve wide dynamic range operation.

[0003] Currently, in mainstream low-noise amplifier designs, bypass branches and active amplifier branches often adopt an architecture that shares some circuit components, especially the matching inductor of the active branch, in order to simplify the circuit structure and reduce the difficulty and cost of device integration.

[0004] However, when the bypass branch of the existing low-noise amplifier is operating, its input matching characteristics are severely degraded due to sharing the matching inductor of the active branch. In addition, the output matching performance is reduced due to the influence of electrostatic discharge (ESD) structure and parasitic parameters of the traces at the output end. Ultimately, this results in excessive insertion loss in the bypass branch, making it impossible to effectively control the attenuation of high-power signals. Furthermore, when the active branch is operating, the isolation between the bypass branch and the active branch is insufficient. The parasitic parameters of the bypass branch will couple to the active branch, leading to an increase in the noise figure and a decrease in gain stability of the active branch. This, in turn, reduces the signal reception quality of the RF front-end module and seriously affects the overall performance of the RF communication system. Summary of the Invention

[0005] This invention provides a low-noise amplifier and RF front-end module with a broadband high-performance bypass, aiming to solve the technical problem that the bypass branch of existing low-noise amplifiers easily affects the gain performance.

[0006] To address the aforementioned technical problems, in a first aspect, the present invention provides a low-noise amplifier with a wideband high-performance bypass, the low-noise amplifier comprising an input matching module, an input amplification module, an output matching and bypass module, and an input bypass module, wherein:

[0007] The input matching module includes an input inductor. The input matching module is used to connect an external radio frequency signal through its input terminal and to provide input impedance matching for the input amplification module through its output terminal.

[0008] The input amplification module includes an amplifying transistor and an active branch switch. The amplifying transistor operates in the high-frequency or mid-frequency band by applying an external bias voltage. The input amplification module receives the external radio frequency signal through its input terminal, amplifies the external radio frequency signal with low noise through the amplifying transistor, and outputs the amplified radio frequency signal through its output terminal. The input amplification module is also used to switch the low-noise amplifier in active or bypass operating mode through the active branch switch.

[0009] The output matching and bypass module includes multiple output mode switches and multiple output matching capacitors. The input terminal of the output matching and bypass module is connected to the output terminal of the input amplification module. The input bypass module is used to connect or disconnect some of the output mode switches according to the operating mode and operating frequency band of the low noise amplifier, so as to turn on some of the output matching capacitors, so that the turned-on output matching capacitors provide output impedance matching for the input amplification module, and output the RF amplified signal through its output terminal.

[0010] The input bypass module includes multiple input mode switches and multiple input matching capacitors. The input terminal of the input bypass module is connected to the input matching module, and the output terminal of the input bypass module is connected to the output matching and bypass module. The input bypass module is used to connect or disconnect some of the input mode switches according to the operating mode and operating frequency band of the low noise amplifier, so as to conduct some of the input matching capacitors, so that the conducted input matching capacitors can cancel the parasitic effect generated by the input inductor when the low noise amplifier is in bypass operating mode.

[0011] Furthermore, the input matching module includes an input inductor and an input capacitor;

[0012] The first end of the input inductor serves as the input terminal of the input matching module and is connected to the external radio frequency signal; the second end of the input inductor is connected to the first end of the input capacitor.

[0013] The second end of the input capacitor serves as the output end of the input matching module and is connected to the input end of the input amplification module.

[0014] Furthermore, the input amplification module includes a first amplification transistor, a second amplification transistor, a first active branch switch, a tuning capacitor, a negative feedback inductor, a first bias resistor, and a second bias resistor;

[0015] The gate of the first amplifying transistor serves as the input terminal of the input amplification module, the source of the first amplifying transistor is connected to the first terminal of the negative feedback inductor, and the drain of the first amplifying transistor is connected to the first terminal of the first active branch switch.

[0016] The source of the second amplifying transistor is connected to the second terminal of the first active branch switch, the drain of the second amplifying transistor serves as the output terminal of the input amplification module, and the gate of the second amplifying transistor is connected to the first terminal of the second bias resistor.

[0017] The first end of the tuning capacitor is connected to the gate of the first amplifying transistor, and the second end of the tuning capacitor is connected to the first end of the negative feedback inductor.

[0018] The second terminal of the negative feedback inductor is grounded;

[0019] The first end of the first bias resistor is connected to the gate of the first amplifying transistor, and the second end of the first bias resistor is connected to the first external bias voltage.

[0020] The second end of the second bias resistor is connected to a second external bias voltage.

[0021] Furthermore, the output matching and bypass module includes a first output inductor, a second output inductor, a first output mode switch, a second output mode switch, a third output mode switch, a fourth output mode switch, a first output matching capacitor, a second output matching capacitor, a third output matching capacitor, a fourth output matching capacitor, and a fifth output matching capacitor;

[0022] The first end of the first output inductor is connected to the output end of the input amplification module as the input end of the output matching and bypass module, and the second end of the first output inductor is connected to the first end of the second output inductor.

[0023] The second terminal of the second output inductor is connected to an external power supply voltage;

[0024] The first terminal of the first output mode switch is connected to the first terminal of the first output inductor, and the second terminal of the first output mode switch is connected to the first terminal of the third output matching capacitor.

[0025] The first terminal of the second output mode switch is connected to the first terminal of the first output mode switch, and the second terminal of the second output mode switch is connected to the first terminal of the second output matching capacitor.

[0026] The first terminal of the third output mode switch is connected to the second terminal of the first output inductor, and the second terminal of the third output mode switch is connected to the first terminal of the fourth output matching capacitor.

[0027] The first terminal of the fourth output mode switch is connected to the first terminal of the second output mode switch, and the second terminal of the fourth output mode switch is connected to the first terminal of the fifth output matching capacitor.

[0028] The first terminal of the first output matching capacitor is connected to the first terminal of the third output mode switch, and the second terminal of the first output matching capacitor serves as the output terminal of the output matching and bypass module, outputting the radio frequency amplified signal to the outside.

[0029] The second terminal of the second output matching capacitor is connected to the second terminal of the first output matching capacitor;

[0030] The second terminal of the third output matching capacitor is grounded.

[0031] The second terminal of the fourth output matching capacitor is connected to the second terminal of the first output matching capacitor;

[0032] The second terminal of the fifth output matching capacitor is connected to the second terminal of the first output matching capacitor.

[0033] Furthermore, the input bypass module includes a first input mode switch, a second input mode switch, a third input mode switch, a fourth input mode switch, a first input matching capacitor, and a second input matching capacitor;

[0034] The first terminal of the first input mode switch is connected to the second terminal of the input inductor as the input terminal of the input bypass module, and the second terminal of the first input mode switch is connected to the first terminal of the second input mode switch.

[0035] The second terminal of the second input mode switch is grounded;

[0036] The first terminal of the third input mode switch is connected to the second terminal of the first input mode switch, and the second terminal of the third input mode switch is connected to the first terminal of the first input matching capacitor.

[0037] The first terminal of the fourth input mode switch is connected to the second terminal of the first input mode switch, and the second terminal of the fourth input mode switch is connected to the first terminal of the second input matching capacitor.

[0038] The second terminal of the first input matching capacitor is connected to the second terminal of the first output inductor as the output terminal of the input bypass module.

[0039] The second terminal of the second input matching capacitor is connected to the second terminal of the first input matching capacitor.

[0040] Furthermore, when the first active branch switch is open, the first input mode switch is open, and the second input mode switch, the third input mode switch, the fourth input mode switch, the third output mode switch, and the fourth output mode switch are all connected, putting the low-noise amplifier in active operating mode, wherein:

[0041] When both the first output mode switch and the second output mode switch are off, the amplifying transistor operates in the high-frequency range;

[0042] When both the first output mode switch and the second output mode switch are connected, the amplifying transistor operates in the mid-frequency range.

[0043] Furthermore, when the first active branch switch is closed, the first input mode switch is closed, and the second input mode switch is open, the low-noise amplifier is in bypass operation mode, wherein:

[0044] When the third input mode switch and the third output mode switch are both connected, and the first output mode switch, the second output mode switch, the fourth input mode switch, and the fourth output mode switch are all disconnected, the amplifying transistor operates in the high-frequency band.

[0045] When the first output mode switch, the second output mode switch, the fourth input mode switch, and the fourth output mode switch are all connected, and the third input mode switch and the third output mode switch are all disconnected, the amplifying transistor operates in the mid-frequency band.

[0046] Furthermore, the input matching module also includes a second active branch switch, which is connected in series between the second terminal of the input inductor and the first terminal of the input capacitor. The on or off state of the second active branch switch is the same as that of the first input mode switch.

[0047] Secondly, the present invention also provides a radio frequency front-end module, including a low-noise amplifier with a wideband high-performance bypass as described above.

[0048] The beneficial effect achieved by this invention is that it proposes a low-noise amplifier with broadband high-performance bypass. The bypass of this low-noise amplifier can reasonably select the combination of output inductor and capacitor to counteract the parasitic capacitance effect brought by the output end of the radio frequency system, thereby achieving better bypass performance. It will not cause noise and gain loss to the main amplification branch, and at the same time, it will not introduce more circuit area, making it more suitable for use in existing power amplifier systems. Attached Figure Description

[0049] 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 more readily understood through the detailed description following the accompanying drawings. In the drawings:

[0050] Figure 1 This is a circuit diagram of a low-noise amplifier with broadband high-performance bypass provided in an embodiment of the present invention;

[0051] Figure 2 This is a circuit diagram of another low-noise amplifier with broadband high-performance bypass provided in an embodiment of the present invention. Detailed Implementation

[0052] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0053] Example 1

[0054] Please refer to the image. Figure 1 This is a circuit diagram of a low-noise amplifier 100 with broadband high-performance bypass provided in an embodiment of the present invention. The low-noise amplifier 100 includes an input matching module 101, an input amplification module 102, an output matching and bypass module 103, and an input bypass module 104, wherein:

[0055] The input matching module 101 includes an input inductor. The input matching module 101 is used to receive an external radio frequency signal through its input terminal and to provide input impedance matching for the input amplification module 102 through its output terminal.

[0056] The input amplification module 102 includes an amplifying transistor and an active branch switch. The amplifying transistor operates in the high-frequency or mid-frequency band by applying an external bias voltage. The input amplification module 102 is used to receive the external radio frequency signal through its input terminal, amplify the external radio frequency signal with low noise through the amplifying transistor, and output the radio frequency amplified signal through its output terminal. The input amplification module 102 is also used to switch the low-noise amplifier 100 to either active or bypass operating mode through the active branch switch.

[0057] The output matching and bypass module 103 includes multiple output mode switches and multiple output matching capacitors. The input terminal of the output matching and bypass module 103 is connected to the output terminal of the input amplification module 102. The input bypass module 104 is used to connect or disconnect some of the output mode switches according to the operating mode and operating frequency band of the low noise amplifier 100, so as to conduct some of the output matching capacitors, so that the conducted output matching capacitors provide output impedance matching for the input amplification module 102, and output the radio frequency amplified signal through its output terminal.

[0058] The input bypass module 104 includes multiple input mode switches and multiple input matching capacitors. The input terminal of the input bypass module 104 is connected to the input matching module 101, and the output terminal of the input bypass module 104 is connected to the output matching and bypass module 103. The input bypass module 104 is used to connect or disconnect some of the input mode switches according to the operating mode and operating frequency band of the low noise amplifier 100, so as to conduct some of the input matching capacitors, so that the conducted input matching capacitors can cancel the parasitic effect generated by the input inductor when the low noise amplifier 100 is in bypass operating mode.

[0059] Furthermore, the input matching module 101 includes an input inductor L1 and an input capacitor C1;

[0060] The first end of the input inductor L1 serves as the input terminal of the input matching module 101 and is connected to the external radio frequency signal. The second end of the input inductor L1 is connected to the first end of the input capacitor C1.

[0061] The second end of the input capacitor C1 serves as the output end of the input matching module 101 and is connected to the input end of the input amplification module 102.

[0062] Specifically, such as Figure 1 As shown, the input amplification module 102 includes a first amplification transistor M1, a second amplification transistor M2, and a first active branch switch SW. AC1 , tuning capacitor C2, negative feedback inductor L2, first bias resistor R1 and second bias resistor R2;

[0063] The gate of the first amplifying transistor M1 serves as the input terminal of the input amplification module 102, the source of the first amplifying transistor M1 is connected to the first terminal of the negative feedback inductor L2, and the drain of the first amplifying transistor M1 is connected to the first active branch switch SW. AC1 The first end;

[0064] The source of the second amplifying transistor M2 is connected to the first active branch switch SW. AC1The second terminal of the second amplifying transistor M2 is the drain of the second amplifying transistor M2, which serves as the output terminal of the input amplifying module 102. The gate of the second amplifying transistor M2 is connected to the first terminal of the second bias resistor.

[0065] The first end of the tuning capacitor C2 is connected to the gate of the first amplifying transistor M1, and the second end of the tuning capacitor C2 is connected to the first end of the negative feedback inductor L2.

[0066] The second terminal of the negative feedback inductor L2 is grounded;

[0067] The first terminal of the first bias resistor R1 is connected to the gate of the first amplifying transistor M1, and the second terminal of the first bias resistor R1 is connected to the first external bias voltage V. cs ;

[0068] The second terminal of the second bias resistor R2 is connected to the second external bias voltage V. cg .

[0069] Furthermore, the output matching and bypass module 103 includes a first output inductor L3, a second output inductor L4, and a first output mode switch SW. MB1 Second output mode switch SW MB2 Third output mode switch SW BP_HB1 Fourth output mode switch SW BP_MB1 First output matching capacitor C3, second output matching capacitor C4, third output matching capacitor C5, fourth output matching capacitor C BP2_HB And the fifth output matching capacitor C BP2_MB ;

[0070] The first end of the first output inductor L3 is connected to the output end of the input amplification module 102 as the input end of the output matching and bypass module 103, and the second end of the first output inductor L3 is connected to the first end of the second output inductor L4.

[0071] The second terminal of the second output inductor L4 is connected to the external power supply voltage VDD;

[0072] First output mode switch SW MB1 The first terminal is connected to the first terminal of the first output inductor L3, and the first output mode switch SW MB1 The second end is connected to the first end of the third output matching capacitor;

[0073] Second output mode switch SW MB2 The first terminal is connected to the first output mode switch SW MB1 The first terminal, the second output mode switch SW MB2The second terminal is connected to the first terminal of the second output matching capacitor C4;

[0074] The third output mode switch SW BP_HB1 The first terminal is connected to the second terminal of the first output inductor L3, and the third output mode switch SW BP_HB1 The second terminal is connected to the fourth output matching capacitor C. BP2_HB The first end;

[0075] The fourth output mode switch SW BP_MB1 The first terminal is connected to the second output mode switch SW MB2 The first terminal, the fourth output mode switch SW BP_MB1 The second terminal is connected to the fifth output matching capacitor C. BP2_MB The first end;

[0076] The first terminal of the first output matching capacitor C3 is connected to the third output mode switch SW. BP_HB1 The first terminal and the second terminal of the first output matching capacitor C3 serve as the output terminal of the output matching and bypass module 103, outputting the radio frequency amplified signal to the outside.

[0077] The second terminal of the second output matching capacitor C4 is connected to the second terminal of the first output matching capacitor C3;

[0078] The second terminal of the third output matching capacitor C5 is grounded;

[0079] The fourth output matching capacitor C BP2_HB The second terminal is connected to the second terminal of the first output matching capacitor C3;

[0080] The fifth output matching capacitor C BP2_MB The second end is connected to the second end of the first output matching capacitor C3.

[0081] Furthermore, the input bypass module 104 includes a first input mode switch SW. BP1 Second input mode switch SW BP2 Third input mode switch SW BP_HB2 Fourth input mode switch SW BP_MB2 First input matching capacitor C BP1_HB Second input matching capacitor C BP1_MB ;

[0082] First input mode switch SW BP1 The first terminal serves as the input terminal of the input bypass module 104 and is connected to the second terminal of the input inductor L1. The first input mode switch SW BP1 The second end is connected to the second input mode switch SWBP2 The first end;

[0083] Second input mode switch SW BP2 The second terminal is grounded;

[0084] The third input mode switch SW BP_HB2 The first end is connected to the first input mode switch SW BP1 The second end, the third input mode switch SW BP_HB2 The second end is connected to the first input matching capacitor C. BP1_HB The first end;

[0085] The fourth input mode switch SW BP_MB2 The first end is connected to the first input mode switch SW BP1 The second end, the fourth input mode switch SW BP_MB2 The second terminal is connected to the second input matching capacitor C. BP1_MB The first end;

[0086] The first input matching capacitor C BP1_HB The second end is connected to the second end of the first output inductor L3 as the output end of the input bypass module 104.

[0087] The second input matching capacitor C BP1_MB The second terminal is matched with the first input capacitor C BP1_HB The second end is connected.

[0088] In addition, such as Figure 1 As shown, preferably, an additional capacitor C7 is connected under the external power supply voltage VDD to improve circuit stability.

[0089] Next, the switch combination states in the output matching and bypass module 103 and the input bypass module 104 in the embodiments of the present invention will be described.

[0090] The first active branch switch SW AC1 When disconnected, and the first input mode switch SW BP1 Disconnect the second input mode switch SW BP2 The third input mode switch SW BP_HB2 The fourth input mode switch SW BP_MB2 The third output mode switch SW BP_HB1 and the fourth output mode switch SW BP_MB1 When all connections are made, the low-noise amplifier 100 is in active operating mode, wherein:

[0091] First output mode switch SW MB1 and the second output mode switch SWMB2 When all are disconnected, the amplifying transistor operates in the high-frequency range; at this time, only the first output matching capacitor C3 of the output matching and bypass module 103 is in the closed state, ensuring the stability of the active working state.

[0092] First output mode switch SW MB1 and the second output mode switch SW MB2 When all are connected, the amplifying transistor operates in the mid-frequency band; at this time, the second output matching capacitor C4 and the third output matching capacitor C5 of the output matching and bypass module 103 are introduced into the path to adjust the output matching.

[0093] During implementation, by utilizing the negative feedback inductor L2 and the first output inductor L3 to participate in matching at different frequency bands, good output matching and high gain performance can be achieved.

[0094] The first active branch switch SW AC1 When connected, and the first input mode switch SW BP1 Connect, the second input mode switch SW BP2 When disconnected, the low-noise amplifier 100 is in bypass mode, wherein:

[0095] The third input mode switch SW BP_HB2 and the third output mode switch SW BP_HB1 All are connected, and the first output mode switch SW MB1 The second output mode switch SW MB2 The fourth input mode switch SW BP_MB2 and the fourth output mode switch SW BP_MB1 When both are disconnected, the amplifying transistor operates in the high-frequency range; at this time, the output matching and bypass module 103 has a first output matching capacitor C3 and a fourth output matching capacitor C BP2_HB When in the circuit state, the output matching in the bypass working mode is adjusted by using these two capacitors in conjunction with the negative feedback inductor L2;

[0096] First output mode switch SW MB1 The second output mode switch SW MB2 The fourth input mode switch SW BP_MB2 and the fourth output mode switch SW BP_MB1 All are connected, the third input mode switch SW BP_HB2 and the third output mode switch SW BP_HB1 When all capacitors are disconnected, the amplifying transistor operates in the mid-frequency range; at this time, the second output matching capacitor C4, the third output matching capacitor C5, and the fifth output matching capacitor C of the output matching and bypass module 103... BP2_MBThe circuit is introduced to work with the negative feedback inductor L2 to adjust the output matching.

[0097] Example 2

[0098] Please refer to Figure 2 , Figure 2 This is a circuit diagram of another low-noise amplifier 100 with broadband high-performance bypass provided in this embodiment of the invention. The difference from the first embodiment is that the input matching module 101 further includes a second active branch switch SW. AC2 The second active branch switch SW AC2 The second active branch switch SW is connected in series between the second terminal of the input inductor L1 and the first terminal of the input capacitor C1. AC2 The switch state is related to the first input mode switch SW BP1 same.

[0099] Second active branch switch SW AC2 The presence or absence of [something] has different effects on the low-noise amplifier 100 in different operating modes. Specifically, when the second active branch switch SW... AC2 When present, the noise figure of the low-noise amplifier 100 in active operating mode (compared to the second active branch switch SW) AC2 The impedance matching (S11, S22) is slightly higher (approximately 0.05-0.1dB), but the impedance matching is more stable and the gain is more balanced, resulting in a more balanced performance.

[0100] In bypass mode, the low-noise amplifier 100 has more stable impedance matching and lower insertion loss because it is not affected by the input inductor L1 and input capacitor C1 in the input matching module 101.

[0101] And when the second active branch switch SW AC2 When absent, the noise figure of the low-noise amplifier 100 is optimized in active operating mode (approximately 0.05-0.1 dB).

[0102] In bypass mode, the input amplifier module 102 will couple with the input inductor L1 and input capacitor C1 in the input matching module 101, which will slightly affect the impedance matching and slightly increase the insertion loss.

[0103] Based on the priority of active or bypass operating modes during actual use of the low-noise amplifier 100, the second active branch switch SW AC2 You can choose to use it according to your needs.

[0104] The beneficial effect achieved by this invention is that it proposes a low-noise amplifier 100 with broadband high-performance bypass. The bypass of the low-noise amplifier 100 can reasonably select the combination of output inductor and capacitor to offset the parasitic capacitance effect brought by the output terminal of the radio frequency system, thereby achieving better bypass performance. It will not cause noise and gain loss to the main amplification branch, and at the same time, it will not introduce more circuit area, making it more suitable for use in existing power amplifier systems.

[0105] Example 3

[0106] This invention also provides a radio frequency (RF) front-end module, which includes the broadband high-performance bypass low-noise amplifier 100 described in any of the above embodiments. It is understood that the RF front-end module, based on the low-noise amplifier 100, can reasonably select the combination of output inductors and capacitors to counteract the parasitic capacitance effects at the output end of the RF system, thereby achieving better bypass performance. Referring to the descriptions in the above embodiments, further details are omitted here.

[0107] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0108] The embodiments of the present invention have been described above with reference to the accompanying drawings. The disclosed embodiments are merely preferred embodiments of the present invention. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many equivalent changes in form under the guidance of the present invention without departing from the spirit and scope of the claims. All such changes are within the protection scope of the present invention.

Claims

1. A low-noise amplifier with broadband high-performance bypass, characterized in that, The low-noise amplifier includes an input matching module, an input amplification module, an output matching and bypass module, and an input bypass module, wherein: The input matching module includes an input inductor. The input matching module is used to connect an external radio frequency signal through its input terminal and to provide input impedance matching for the input amplification module through its output terminal. The input amplification module includes an amplifying transistor and an active branch switch. The amplifying transistor operates in the high-frequency or mid-frequency band by applying an external bias voltage. The input amplification module receives the external radio frequency signal through its input terminal, amplifies the external radio frequency signal with low noise through the amplifying transistor, and outputs the amplified radio frequency signal through its output terminal. The input amplification module is also used to switch the low-noise amplifier in active or bypass operating mode through the active branch switch. The output matching and bypass module includes multiple output mode switches and multiple output matching capacitors. The input terminal of the output matching and bypass module is connected to the output terminal of the input amplification module. The output matching and bypass module is used to connect or disconnect some of the output mode switches according to the operating mode and operating frequency band of the low noise amplifier, so as to turn on some of the output matching capacitors, so that the turned-on output matching capacitors provide output impedance matching for the input amplification module, and output the radio frequency amplified signal through its output terminal. The input bypass module includes multiple input mode switches and multiple input matching capacitors. The input terminal of the input bypass module is connected to the input matching module, and the output terminal of the input bypass module is connected to the output matching and bypass module. The input bypass module is used to connect or disconnect some of the input mode switches according to the operating mode and operating frequency band of the low noise amplifier, so as to conduct some of the input matching capacitors, so that the conducted input matching capacitors can cancel the parasitic effect generated by the input inductor when the low noise amplifier is in bypass operating mode. The input matching module further includes an input capacitor; The first end of the input inductor serves as the input terminal of the input matching module and is connected to the external radio frequency signal; the second end of the input inductor is connected to the first end of the input capacitor. The second end of the input capacitor serves as the output end of the input matching module and is connected to the input end of the input amplification module. The amplifying transistor in the input amplification module includes a first amplifying transistor and a second amplifying transistor. The active branch switch includes a first active branch switch. The input amplification module also includes a tuning capacitor, a negative feedback inductor, a first bias resistor, and a second bias resistor. The gate of the first amplifying transistor serves as the input terminal of the input amplification module, the source of the first amplifying transistor is connected to the first terminal of the negative feedback inductor, and the drain of the first amplifying transistor is connected to the first terminal of the first active branch switch. The source of the second amplifying transistor is connected to the second terminal of the first active branch switch, the drain of the second amplifying transistor serves as the output terminal of the input amplification module, and the gate of the second amplifying transistor is connected to the first terminal of the second bias resistor. The first end of the tuning capacitor is connected to the gate of the first amplifying transistor, and the second end of the tuning capacitor is connected to the first end of the negative feedback inductor. The second terminal of the negative feedback inductor is grounded; The first end of the first bias resistor is connected to the gate of the first amplifying transistor, and the second end of the first bias resistor is connected to the first external bias voltage. The second terminal of the second bias resistor is connected to a second external bias voltage; The output matching and bypass module includes a first output inductor, a second output inductor, a first output mode switch, a second output mode switch, a third output mode switch, a fourth output mode switch, a first output matching capacitor, a second output matching capacitor, a third output matching capacitor, a fourth output matching capacitor, and a fifth output matching capacitor; The first end of the first output inductor is connected to the output end of the input amplification module as the input end of the output matching and bypass module, and the second end of the first output inductor is connected to the first end of the second output inductor. The second terminal of the second output inductor is connected to an external power supply voltage; The first terminal of the first output mode switch is connected to the first terminal of the first output inductor, and the second terminal of the first output mode switch is connected to the first terminal of the third output matching capacitor. The first terminal of the second output mode switch is connected to the first terminal of the first output mode switch, and the second terminal of the second output mode switch is connected to the first terminal of the second output matching capacitor. The first terminal of the third output mode switch is connected to the second terminal of the first output inductor, and the second terminal of the third output mode switch is connected to the first terminal of the fourth output matching capacitor. The first terminal of the fourth output mode switch is connected to the first terminal of the second output mode switch, and the second terminal of the fourth output mode switch is connected to the first terminal of the fifth output matching capacitor. The first end of the first output matching capacitor is connected to the first end of the third output mode switch, and the second end of the first output matching capacitor serves as the output end of the output matching and bypass module, outputting the radio frequency amplified signal to the outside. The second terminal of the second output matching capacitor is connected to the second terminal of the first output matching capacitor; The second terminal of the third output matching capacitor is grounded. The second terminal of the fourth output matching capacitor is connected to the second terminal of the first output matching capacitor; The second terminal of the fifth output matching capacitor is connected to the second terminal of the first output matching capacitor.

2. The low-noise amplifier with broadband high-performance bypass according to claim 1, characterized in that, The input bypass module includes a first input mode switch, a second input mode switch, a third input mode switch, a fourth input mode switch, a first input matching capacitor, and a second input matching capacitor; The first terminal of the first input mode switch is connected to the second terminal of the input inductor as the input terminal of the input bypass module, and the second terminal of the first input mode switch is connected to the first terminal of the second input mode switch. The second terminal of the second input mode switch is grounded; The first terminal of the third input mode switch is connected to the second terminal of the first input mode switch, and the second terminal of the third input mode switch is connected to the first terminal of the first input matching capacitor. The first terminal of the fourth input mode switch is connected to the second terminal of the first input mode switch, and the second terminal of the fourth input mode switch is connected to the first terminal of the second input matching capacitor. The second terminal of the first input matching capacitor is connected to the second terminal of the first output inductor as the output terminal of the input bypass module. The second terminal of the second input matching capacitor is connected to the second terminal of the first input matching capacitor.

3. The low-noise amplifier with broadband high-performance bypass according to claim 2, characterized in that, When the first active branch switch is connected, the first input mode switch is disconnected, the second input mode switch is connected, and the third input mode switch, the fourth input mode switch, the third output mode switch, and the fourth output mode switch are all disconnected, thus putting the low-noise amplifier in active operating mode, wherein: When both the first output mode switch and the second output mode switch are off, the amplifying transistor operates in the high-frequency range; When both the first output mode switch and the second output mode switch are connected, the amplifying transistor operates in the mid-frequency range.

4. The low-noise amplifier with broadband high-performance bypass according to claim 2, characterized in that, When the first active branch switch is open and the first input mode switch is closed, and the second input mode switch is open, the low-noise amplifier is in bypass mode, wherein: When the third input mode switch and the third output mode switch are both connected, and the first output mode switch, the second output mode switch, the fourth input mode switch, and the fourth output mode switch are all disconnected, the amplifying transistor operates in the high-frequency band. When the first output mode switch, the second output mode switch, the fourth input mode switch, and the fourth output mode switch are all connected, and the third input mode switch and the third output mode switch are all disconnected, the amplifying transistor operates in the mid-frequency band.

5. The low-noise amplifier with broadband high-performance bypass according to claim 2, characterized in that, The input matching module further includes a second active branch switch, which is connected in series between the second end of the input inductor and the first end of the input capacitor. The on or off state of the second active branch switch is the same as that of the first input mode switch.

6. A radio frequency front-end module, characterized in that, Includes a low-noise amplifier with a wideband high-performance bypass as described in any one of claims 1-5.

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