Low noise amplifier, radio frequency chip and communication equipment

Abstract

The present application discloses a low-noise amplifier, a radio frequency chip, and a communication device, relating to the field of communication technology, and is used to achieve the low-loss requirements of a bypass operating mode in application scenarios with a wide bandwidth frequency band. The low-noise amplifier has an input port and an output port, and includes: an input matching circuit, a gain circuit, an output matching circuit, and a bypass circuit; the input port is coupled to the input end of the input matching circuit, the output end of the input matching circuit is coupled to the input end of the gain circuit and the input end of the bypass circuit respectively, the output end of the gain circuit is coupled to the input end of the output matching circuit, and the output end of the output matching circuit and the output end of the bypass circuit are both coupled to the output port; the low-noise amplifier has a bypass operating mode and a gain operating mode; when the low-noise amplifier is in the bypass operating mode, the bypass circuit is used to provide different matching impedances in a first frequency band and a second frequency band, respectively.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a low noise amplifier, a radio frequency chip, and a communication device. Background Art

[0002] In wireless communications such as cellular communications, wireless fidelity (WiFi) communications, and satellite communications, the low-noise amplifier (LNA) is located in the terminal receiver and is one of the key circuits of the terminal receiver. It can be used to receive designated downlink signals.

[0003] In wireless communications, the low-noise amplifier (LNA) in a terminal receiver automatically switches between different operating modes as the distance between the terminal receiver and the base station changes. For example, in the strong field conditions of cellular communications, the LNA switches to bypass mode, which offers high linearity and low loss. However, in some wide-bandwidth applications, such as the N77, N79, N104, or Wi-Fi 7 bands, existing LNAs cannot achieve the low loss requirements of bypass mode. Summary of the Invention

[0004] The present application provides a low-noise amplifier, a radio frequency chip, and a communication device for achieving the low-loss requirements of a bypass working mode in application scenarios with a wide bandwidth frequency band.

[0005] To achieve the above objectives, this application adopts the following technical solutions:

[0006] In a first aspect, a low-noise amplifier is provided, which has an input port and an output port, and includes: an input matching circuit, a gain circuit, an output matching circuit and a bypass circuit; the input port is coupled to the input end of the input matching circuit, the output end of the input matching circuit is coupled to the input end of the gain circuit and the input end of the bypass circuit respectively, the output end of the gain circuit is coupled to the input end of the output matching circuit, and the output end of the output matching circuit and the output end of the bypass circuit are both coupled to the output port; the low-noise amplifier has a bypass operating mode and a gain operating mode; when the low-noise amplifier is in the bypass operating mode, the bypass circuit is used to: provide different matching impedances in a first frequency band and a second frequency band, respectively, the first frequency band and the second frequency band being different operating frequency bands.

[0007] When the above technical solution is adopted, in the bypass operating mode, the bypass circuit can provide different resonant frequencies according to different operating frequency bands. For example, in the first frequency band, it provides a resonant frequency corresponding to the first frequency band, and in the second frequency band, it provides a resonant frequency corresponding to the second frequency band. By tuning the resonant frequency, the purpose of impedance matching is achieved, and when transmitting RF signals, the transmission loss of RF signals can be minimized to the greatest extent. In addition, because the bypass circuit itself has a frequency tuning function, in the bypass operating mode, the input matching circuit does not need to perform a tuning function, so that the input matching circuit can be designed based on the circuit structure of the gain circuit, thereby achieving optimal impedance matching in the gain operating mode.

[0008] In a possible implementation of the first aspect, the bypass circuit includes: a bypass input selection switch, a bypass broadband matching network, and a bypass output selection switch; a first end of the bypass input selection switch is coupled to the output end of the input matching circuit, a second end of the bypass input selection switch is coupled to the input end of the bypass broadband matching network, the output end of the bypass broadband matching network is coupled to the first end of the bypass output selection switch, the output end of the output matching circuit is coupled to the second end of the bypass output selection switch, and a third end of the bypass output selection switch is coupled to the output port; when the low-noise amplifier is in the bypass operating mode, the bypass input selection switch is used to connect the input matching circuit and the bypass broadband matching network; the bypass broadband matching network is used to provide different matching impedances in the first frequency band and the second frequency band, respectively; and the bypass output selection switch is used to connect the bypass broadband matching network and the output port. In the above possible implementation methods, the bypass broadband matching network itself has the function of frequency tuning. In the bypass working mode, the input matching circuit does not need to assume more tuning functions, so that the input matching circuit can be designed for matching based on the circuit structure of the gain circuit, thereby achieving optimal impedance matching in the gain working mode.

[0009] In a possible implementation of the first aspect, the bypass broadband matching network includes: an adjustable inductor and an adjustable capacitor; the first end of the adjustable inductor and the first end of the adjustable capacitor are both coupled to the second end of the bypass input selection switch, the second end of the adjustable inductor is grounded, and the second end of the adjustable capacitor is coupled to the first end of the bypass output selection switch. In the above possible implementation, the resonant frequency of the bypass broadband matching network is proportional to the inductance value of the adjustable inductor. L and the capacitance value of the adjustable capacitor C The inductance of the adjustable inductor and the capacitance of the adjustable capacitor are inversely proportional to each other, so the purpose of impedance matching can be achieved by adjusting the inductance of the adjustable inductor and the capacitance of the adjustable capacitor.

[0010] In a possible implementation of the first aspect, the bypass broadband matching network further includes a first switch, a first end of the first switch coupled to the first end of the adjustable inductor, and a second end of the first switch grounded. When the low-noise amplifier is in the bypass operating mode, the first switch is in an open state, and when the low-noise amplifier is in the gain operating mode, the first switch is in a closed state. Thus, when the first switch is closed, parasitic capacitance in the bypass circuit can be grounded through the first switch, thereby enhancing reverse isolation in the gain operating mode and preventing oscillation of the gain circuit.

[0011] In a possible implementation of the first aspect, the adjustable inductor includes: a first inductor, a second inductor, a second switch, and a third switch; the first end of the first inductor is coupled to the second end of the bypass input selection switch, the second end of the first inductor is coupled to the first end of the second switch and the first end of the second inductor respectively, the second end of the second switch is grounded, and the second end of the second inductor is grounded through the third switch; when the frequency corresponding to the first frequency band is lower than the frequency corresponding to the second frequency band, if the low-noise amplifier operates in the first frequency band, the second switch is in an open state and the third switch is in a closed state; if the low-noise amplifier operates in the second frequency band, the second switch is in a closed state and the third switch is in an open state. In the above possible implementation, by controlling the second switch and the third switch to be in a closed state or an open state respectively, the inductance value of the adjustable inductor can be conveniently adjusted, thereby achieving impedance matching for the current operating frequency band.

[0012] In a possible implementation of the first aspect, the adjustable capacitor includes: a first capacitor, a second capacitor, a fourth switch, a fifth switch, and a sixth switch; a first end of the fourth switch, a first end of the fifth switch, and a first end of the sixth switch are all coupled to the first end of the adjustable inductor, a second end of the fourth switch is coupled to the first end of the first capacitor, a second end of the fifth switch is coupled to the first end of the second capacitor, and a second end of the first capacitor, a second end of the second capacitor, and a second end of the sixth switch are all coupled to the first input end of the bypass output selection switch; when a frequency corresponding to the first frequency band is lower than a frequency corresponding to the second frequency band, if the low-noise amplifier operates in the first frequency band, the fourth switch is in an open state, the fifth switch is in an open state, or the fourth switch, the fifth switch, and the sixth switch are all in an open state; if the low-noise amplifier operates in the second frequency band, the fourth switch and the fifth switch are in a closed state, and the sixth switch is in an open state. In the above possible implementations, by controlling the fourth switch, the fifth switch and the sixth switch to be in a closed state or an open state respectively, the capacitance value of the adjustable capacitor can be conveniently adjusted, thereby achieving impedance matching for the current operating frequency band.

[0013] In a possible implementation of the first aspect, the low-noise amplifier further includes a control circuit; the control circuit is configured to: in the bypass operating mode, control the bypass input selection switch to be in a closed state, and control the bypass output selection switch to conduct the bypass broadband matching network and the output port; the control circuit is further configured to: in the gain operating mode, control the bypass input selection switch to be in an open state, and control the bypass output selection switch to conduct the output matching circuit and the output port; the control circuit is further configured to: control the bypass broadband matching network to provide different matching impedances in the first frequency band and the second frequency band, respectively. In the above possible implementation, the control circuit can control the bypass input selection switch and the bypass output selection switch to be in a closed state or an open state through a control signal, and the control circuit can also control each switch in the bypass broadband matching network to be in an open state or a closed state through a control signal, so as to provide different resonant frequencies based on different operating frequency bands to achieve the purpose of impedance matching.

[0014] In one possible implementation of the first aspect, the input matching circuit is an inductor. In this possible implementation, the bypass circuit and the gain circuit can use the same inductor for input matching, achieving full coverage of the operating frequency band without switching different input ports, thereby saving circuit area and hardware costs.

[0015] In a second aspect, a radio frequency chip is provided. The radio frequency chip includes a filter and a low noise amplifier provided by the first aspect or any possible implementation of the first aspect coupled to the filter.

[0016] According to a third aspect, a communication device is provided, comprising an antenna and a radio frequency chip as provided in the second aspect coupled to the antenna.

[0017] Among them, the technical effects of the second and third aspects can refer to the technical effects brought about by the first aspect or any possible implementation method of the first aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of a low noise amplifier;

[0019] Figure 2 Schematic diagram of the structure of another low noise amplifier;

[0020] Figure 3 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application;

[0021] Figure 4 A schematic diagram of the structure of a low noise amplifier provided in an embodiment of the present application;

[0022] Figure 5 A schematic diagram of the structure of another low-noise amplifier provided in an embodiment of the present application;

[0023] Figure 6 A schematic diagram of a circuit topology of a bypass broadband matching network provided in an embodiment of the present application;

[0024] Figure 7 A schematic diagram of a low noise amplifier in bypass mode provided in an embodiment of the present application;

[0025] Figure 8 A schematic diagram of a low noise amplifier in a gain operating mode provided by an embodiment of the present application;

[0026] Figure 9 A schematic diagram of a circuit topology of a low-noise amplifier in bypass mode provided in an embodiment of the present application;

[0027] Figure 10 A schematic diagram of a matching relationship of a Smith chart provided in an embodiment of the present application;

[0028] Figure 11 A loss simulation diagram provided in an embodiment of the present application;

[0029] Figure 12 A schematic diagram of a circuit topology of another low-noise amplifier in bypass mode provided in an embodiment of the present application;

[0030] Figure 13 Another loss simulation schematic diagram provided for an embodiment of the present application. DETAILED DESCRIPTION

[0031] The following will discuss in detail the making and use of various embodiments. However, it should be understood that many applicable inventive concepts provided herein can be implemented in a variety of specific contexts. The specific embodiments discussed are merely illustrative of specific ways to implement and use the present application and technology and do not limit the scope of this application.

[0032] Unless defined otherwise, all technical and scientific terms used herein have the same meanings as commonly understood by one of ordinary skill in the art.

[0033] Various circuits or other components may be described or referred to as being "configured to" perform one or more tasks. In this case, "configured to" is used to imply structure by indicating that the circuit / component includes structure (e.g., circuitry) that performs the one or more tasks during operation. Thus, even when the specified circuit / component is not currently operational (e.g., not turned on), the circuit / component may be referred to as being configured to perform the task. A circuit / component used with the phrase "configured to" includes hardware, such as circuitry that performs an operation.

[0034] The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. In the present application, "at least one" means one or more, and "more" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the related objects before and after are in an "or" relationship. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b or c can mean: a, b, c, a and b, a and c, b and c, a, b and c; where a, b and c can be single or multiple.

[0035] The embodiments of this application use terms such as "first" and "second" to distinguish objects with similar names, functions, or effects. Those skilled in the art will understand that terms such as "first" and "second" do not limit the quantity or order of execution. The term "coupled" is used to indicate an electrical connection, including direct connection via wires or connectors or indirect connection via other devices. Therefore, "coupling" should be considered a broadly defined electronic communication connection.

[0036] It should be noted that, in this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described in this application as "exemplary" or "for example" should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0037] Before introducing the embodiments of the present application, the application scenarios involved in the present application are first introduced and explained.

[0038] In wireless communications, such as cellular, Wi-Fi, and satellite communications, the low-noise amplifier (LNA) is a key circuit within the terminal receiver, used to receive designated downlink signals. As the distance between the terminal receiver and the base station changes, the LNA automatically switches between different operating modes. When the terminal receiver is far from the base station, the LNA switches to gain mode, amplifying the received signal. When the terminal receiver is close to the base station (for example, in the strong field of cellular communications), the LNA switches to bypass mode, shutting down the LNA and consuming virtually no current, resulting in high linearity and low loss.

[0039] As a first example, Figure 1The structure of a low noise amplifier is shown in FIG. Figure 1 As shown, the structure of the low noise amplifier includes a matching inductor 101, an amplifier 102, a parasitic capacitor 103, and a bypass switch 104. The first end of the matching inductor 101 is used to receive a radio frequency signal, the second end of the matching inductor 101 is coupled to the input end of the amplifier 102 and the first end of the parasitic capacitor 103, respectively, the second end of the parasitic capacitor 103 is grounded, and the output end of the amplifier 102 and the first end of the parasitic capacitor 103 are also coupled to the radio frequency signal output end through the bypass switch 104.

[0040] When the low-noise amplifier is in gain mode, the input signal can sequentially pass through matching inductor 101, amplifier 102, and bypass switch 104 before being output. In this case, the low-noise amplifier uses matching inductor 101 to achieve input impedance matching in gain mode. When the low-noise amplifier is in bypass mode, the input signal can sequentially pass through matching inductor 101, parasitic capacitor 103, and bypass switch 104 before being output. In this case, the low-noise amplifier uses matching inductor 101 to offset the parasitic effects of parasitic capacitor 103, and amplifier 102 is in a disabled state, reducing power consumption. However, in this example, when the frequency of the input signal changes, the low-noise amplifier is unable to perform impedance matching based on the frequency of the input signal, resulting in a relatively large transmission loss of the input signal, almost reaching -3dB (decibel) loss, which fails to meet the gain requirements of the terminal receiver.

[0041] As a second example, Figure 2 Another low noise amplifier structure is shown in FIG. Figure 2 As shown, the structure of the low noise amplifier includes multiple matching inductors (201, 202 and 203), multiple amplifiers (Q1, Q2 and Q3), capacitor C1, bypass matching network 204, output matching network 205, RLC network 206, and multiple transistors (Q4-Q11). The specific connection relationship is as follows Figure 2As shown. The control terminal of each amplifier is coupled to a corresponding matching inductor. For example, matching inductor 201 is coupled to amplifier Q1, matching inductor 202 is coupled to amplifier Q2, and matching inductor 203 is coupled to amplifier Q3. By controlling the on / off states of transistors Q4, Q5, and Q6, different matching inductors can be used to achieve signal transmission in different frequency bands. When the low-noise amplifier is in bypass mode, for example, the path where matching inductor 201 is located can be selected, and the input signal passes through matching inductor 201, transistor Q4, transistor Q7, bypass matching network 204, and finally output through transistor Q8. Alternatively, when the path where matching inductor 202 is located can be selected, the input signal passes through matching inductor 202, transistor Q5, transistor Q7, bypass matching network 204, and finally output through transistor Q8. In this example, using the same matching inductor (e.g., 201) cannot cover all operating frequency bands of the terminal receiver. If all operating frequency bands need to be covered, transistors Q4, Q5, and Q6 must be used to switch different matching inductors (201, 202, and 203) as different input terminals. This not only occupies a larger chip area and increases hardware costs, but also the bypass matching network 204 needs to compromise and adapt to different matching inductors (201, 202, and 203), respectively, and optimal passive bypass loss cannot be achieved.

[0042] Especially in some wide-bandwidth frequency band applications, such as the n77 band (3.3GHz-4.2GHz), n79 band (4.4GHz-5.0GHz), n104 band (6425MHz-7125MHz), and Wi-Fi 7 band (2.4GHz, 5GHz, and 6GHz), the low-loss requirements of bypass mode cannot be achieved. GHz is the frequency unit of gigahertz, and MHz is the frequency unit of megahertz.

[0043] Based on this, embodiments of the present application provide a low-noise amplifier (LNA) that achieves the low-loss requirements of bypass mode operation in wide-bandwidth frequency band applications. The LNA can be integrated into a radio frequency chip (RFC) that includes a filter, coupled to the filter. The RF CNC can be applied to various communication devices (e.g., terminal receivers) with an antenna and coupled to the antenna. For ease of description, the communication device may also be referred to as an electronic device.

[0044] Optionally, the electronic device may include, but is not limited to: mobile phones, tablet computers, laptop computers, PDAs, mobile internet devices (MIDs), cameras, wearable devices (such as smart watches, smart bracelets, pedometers, etc.), audio equipment, audio and video players, set-top boxes, game consoles, printers, mice, keyboards, vehicle-mounted equipment (such as equipment on vehicles such as cars, airplanes, ships, trains and high-speed trains), virtual reality (VR) equipment, augmented reality (AR) equipment, wireless terminals in industrial control, smart home devices (such as refrigerators, televisions, air conditioners, electricity meters, etc.), intelligent robots, workshop equipment, wireless terminals in self-driving, wireless terminals in remote medical surgery, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, or wireless terminals in smart homes, flying equipment (such as intelligent robots, hot air balloons, drones, airplanes), etc.

[0045] The following takes the electronic device as an example, and describes the structure of the electronic device. Figure 3 As shown, the electronic device may include components such as a radio frequency (RF) circuit 310 , a memory 320 , an input unit 330 , a display unit 340 , a sensor 350 , an audio circuit 360 , a processor 370 , and a power supply 380 .

[0046] The RF circuit 310 can be used to send and receive information, or to receive or send signals during a call. Specifically, after receiving downlink information from the base station, it is passed to the processor 370 for processing; in addition, uplink data is sent to the base station. Typically, the RF circuit 310 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a duplexer, and the like. Furthermore, the RF circuit 310 can communicate with the network and other devices via wireless communication. Optionally, the low-noise amplifier provided in embodiments of the present application can be integrated into the RF circuit 310.

[0047] Memory 320 can be used to store data, software programs, and modules. It primarily includes a program storage area and a data storage area. The program storage area can store an operating system and at least one application required for a function, such as sound playback or image playback. The data storage area can store data generated based on the use of the electronic device, such as audio data, image data, and a phone book. Furthermore, the electronic device may include high-speed random access memory and non-volatile memory, such as at least one disk storage device, flash memory device, or other volatile solid-state memory device.

[0048] The input unit 330 can be used to receive input digital or character information and generate signal input related to user settings and function control of the electronic device. Specifically, the input unit 330 may include a touch screen 331 and other input devices 332. The touch screen 331 can collect user touch operations on or near it (such as operations performed by the user using a finger, stylus, or any other suitable object or accessory on or near the touch screen) and drive corresponding connected devices according to pre-set programs. Optionally, the other input devices 332 may include, but are not limited to, one or more of a physical keyboard, function keys (such as volume control buttons, power on / off buttons, etc.), a trackball, a mouse, a joystick, etc.

[0049] The display unit 340 can be used to display information input by or provided to the user, as well as various menus of the electronic device. In one example, the display unit 340 may include a display screen 341, which may be configured in the form of a liquid crystal display (LCD), an organic light-emitting diode (OLED), or the like. Furthermore, a touch screen 331 may overlay the display screen 341. When the touch screen 331 detects a touch operation on or near the touch screen, the touch screen 331 transmits the information to the processor 370 to determine the type of touch event. The processor 370 then provides a corresponding visual output on the display screen 341 based on the type of touch event. Although the touch screen 331 and the display screen 341 are shown as separate components to implement the input and output functions of the electronic device, in some embodiments, the touch screen 331 and the display screen 341 may be integrated to implement the input and output functions of the electronic device.

[0050] Sensor 350 may include one or more sensors for providing various status assessments for the electronic device. Specifically, sensor 350 may include a light sensor, which can be used in imaging applications, i.e., as a component of a camera or video camera. Sensor 350 may also include an accelerometer, a gyroscope, a magnetic sensor, a pressure sensor, or a temperature sensor. Sensor 350 can detect the acceleration / deceleration, orientation, open / closed state of the electronic device, relative positioning of components, or temperature changes of the electronic device.

[0051] The audio circuit 360, speaker, and microphone provide an audio interface between the user and the electronic device. The audio circuit 360 converts received audio data into electrical signals and transmits them to the speaker, which then converts them into sound signals for output. The microphone, on the other hand, converts collected sound signals into electrical signals, which are then received by the audio circuit 360 and converted into audio data. The audio data is then output to the RF circuit 310 for transmission to, for example, another mobile phone, or to the memory 320 for further processing.

[0052] The processor 370 is the control center of the electronic device. It connects all parts of the electronic device using various interfaces and lines. By running or executing software programs and / or modules stored in the memory 320 and accessing data stored in the memory 320, it performs various functions of the electronic device and processes data, thereby monitoring the entire electronic device. Optionally, the processor 370 may include one or more processing units, which may include but are not limited to: a central processing unit (CPU), a network processing unit (NPU), a graphics processing unit (GPU), an image signal processor (ISP), a tensor processing unit (TPU), a data processing unit (DPU), a digital signal processor (DSP), a microcontroller or microprocessor, etc. Furthermore, the processor 370 may also include other hardware circuits or accelerators, such as an application-specific integrated circuit (ASIC), a complex programmable logic device (CPLD) or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. Optionally, the processor 370 may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a digital signal processor and a microprocessor, etc.

[0053] The electronic device may also include a power supply 380 (e.g., a battery) for powering the various components. The power supply 380 may be logically connected to the processor 370 via a power management system, thereby enabling the power management system to manage charging, discharging, and power consumption. Optionally, the power management system may support both fast charging and non-fast charging technologies. In actual applications, the power management system may charge the battery in the power supply 380 via fast charging technology or via non-fast charging technology.

[0054] Although not shown, the electronic device may also include a wireless fidelity module, a Bluetooth module, etc., which will not be described in detail in the present embodiment. Figure 3 The electronic device structure shown in the figure does not constitute a limitation on the electronic device, and may include Figure 3 More or fewer components, or combinations of certain components, or different arrangements of components.

[0055] Figure 4 A low-noise amplifier structure is provided in an embodiment of the present application. The low-noise amplifier has an input port RFIN and an output port RFOUT. The low-noise amplifier includes an input matching circuit 410, a gain circuit 420, an output matching circuit 430, and a bypass circuit 440. The input port RFIN is coupled to the input of the input matching circuit 410, the output of the input matching circuit 410 is coupled to the input of the gain circuit 420 and the input of the bypass circuit 440, respectively, the output of the gain circuit 420 is coupled to the input of the output matching circuit 430, and the output of the output matching circuit 430 and the output of the bypass circuit 440 are both coupled to the output port RFOUT.

[0056] The input matching circuit 410 is used to achieve impedance matching between the input port RFIN and the gain circuit 420 or the bypass circuit 440, for example, matching to an ideal impedance of 50Ω (ohms). Similarly, the output matching circuit 430 is used to achieve impedance matching between the output port RFOUT and the gain circuit 420, achieving the purpose of transmitting the RF signal at maximum power, thereby improving the transmission efficiency of the RF signal. Furthermore, the input matching circuit 410 can be an inductor. Based on this, the bypass circuit 440 and the gain circuit 420 can use the same inductor for input matching, and full coverage of the operating frequency band can be achieved without switching different input ports RFIN, saving circuit area and hardware costs.

[0057] The low-noise amplifier has a bypass mode and a gain mode. Specifically, when the distance between the terminal receiver and the base station is close (within a strong communication field), the low-noise amplifier can be in bypass mode to avoid harmonic interference caused by excessive signal strength. When the distance between the terminal receiver and the base station is far, the low-noise amplifier can be in gain mode to amplify the RF signal to be amplified, facilitating signal processing based on the amplified RF signal by subsequent circuits or devices (such as filters and processors).

[0058] When the low noise amplifier is in the bypass operating mode, the bypass circuit 440 is configured to provide different matching impedances in the first frequency band and the second frequency band, respectively.

[0059] The first frequency band and the second frequency band may be different operating frequency bands of the terminal receiver. Furthermore, the center frequency of the first frequency band may be smaller than the center frequency of the second frequency band. For example, the first frequency band may be the n77 frequency band, and the second frequency band may be the n79 frequency band, or the first frequency band may be the n79 frequency band, and the second frequency band may be the n104 frequency band. This embodiment of the present application does not specifically limit this.

[0060] Specifically, when the low noise amplifier is in the bypass working mode, the RF signal can pass through the input matching circuit 410 and the bypass circuit 440 in sequence. The bypass circuit 440 can provide different resonant frequencies according to different working frequency bands, thereby achieving the purpose of impedance matching. For example, when the working frequency band of the terminal receiver is n77, the resonant frequency provided by the bypass circuit 440 can be f 1. When the operating frequency band of the terminal receiver is n79, the resonant frequency provided by the bypass circuit 440 can be f 2. Since the center frequency of the n77 band is smaller than the center frequency of the n79 band, f 1 and the f The size relationship of 2 can be: f 1＜ f 2.

[0061] When the low-noise amplifier is in the gain operating mode, the gain circuit 420 can be used to amplify the RF signal. Furthermore, the low-noise amplifier can also include a load network 421 and a degeneration inductor 422. The load network 421 is coupled between the power supply and the gain circuit 420, and the degeneration inductor 422 is coupled between the gain circuit 420 and the ground terminal. The gain circuit 420 is used to amplify the RF signal, and the load network 421 is used to provide the load impedance required by the operating frequency band of the RF signal. The degeneration inductor 422 can act as negative feedback, thereby improving the stability of the gain circuit 420.

[0062] In the low-noise amplifier provided in the embodiment of the present application, in bypass operating mode, the bypass circuit 440 can provide different resonant frequencies according to different operating frequency bands. For example, in a first frequency band, the bypass circuit 440 can provide a resonant frequency corresponding to the first frequency band, and in a second frequency band, the bypass circuit 440 can provide a resonant frequency corresponding to the second frequency band. By tuning the resonant frequencies, impedance matching can be achieved, and when transmitting RF signals, the transmission loss of the RF signal can be minimized to the greatest extent. Furthermore, because the bypass circuit 440 itself has a frequency tuning function, in the bypass operating mode, the input matching circuit 410 does not need to perform a tuning function. This allows the input matching circuit 410 to be designed for matching based on the circuit structure of the gain circuit 420, thereby achieving optimal impedance matching in the gain operating mode.

[0063] In one possible embodiment, Figure 5 As shown, the bypass circuit 440 includes a bypass input selection switch 441, a bypass broadband matching network 442, and a bypass output selection switch 443. A first terminal of the bypass input selection switch 441 is coupled to the output terminal of the input matching circuit 410, a second terminal of the bypass input selection switch 441 is coupled to the input terminal of the bypass broadband matching network 442, an output terminal of the bypass broadband matching network 442 is coupled to a first terminal of the bypass output selection switch 443, an output terminal of the output matching circuit 430 is coupled to a second terminal of the bypass output selection switch 443, and a third terminal of the bypass output selection switch 443 is coupled to the output port RFOUT.

[0064] When the low-noise amplifier is in the bypass operating mode, the bypass input selection switch 441 is used to: turn on the input matching circuit 410 and the bypass broadband matching network 442; the bypass broadband matching network 442 is used to: provide different matching impedances in the first frequency band and the second frequency band respectively; the bypass output selection switch 443 is used to: turn on the bypass broadband matching network 442 and the output port RFOUT.

[0065] In one example, the bypass input selection switch 441 can be a single-pole, single-throw switch. When the low-noise amplifier is in a gain operating mode, the bypass input selection switch 441 is in an open state to disconnect the input matching circuit 410 and the bypass broadband matching network 442. When the low-noise amplifier is in a bypass operating mode, the bypass input selection switch 441 is in a closed state to connect the input matching circuit 410 and the bypass broadband matching network 442. The open state of the switch can also be referred to as the off state of the switch, and the closed state of the switch can also be referred to as the on state of the switch.

[0066] In another example, the bypass input selection switch 441 may also be a single-pole double-throw switch. The input matching circuit 410 may be coupled to a first terminal of the single-pole double-throw switch, a second terminal of the single-pole double-throw switch may be coupled to the input terminal of the gain circuit 420, and a third terminal of the single-pole double-throw switch may be coupled to the input terminal of the bypass broadband matching network 442. When the low-noise amplifier is in a gain operating mode, the bypass input selection switch 441 conducts between the input matching circuit 410 and the gain circuit 420; when the low-noise amplifier is in a bypass operating mode, the bypass input selection switch 441 conducts between the input matching circuit 410 and the bypass broadband matching network 442.

[0067] Similarly, the bypass output selection switch 443 may also be a single-pole single-throw switch or a single-pole double-throw switch. When the bypass output selection switch 443 is a single-pole single-throw switch, when the low-noise amplifier is in the gain operating mode, the bypass output selection switch 443 is in an open state to disconnect the bypass broadband matching network 442 from the output port RFOUT. When the low-noise amplifier is in the bypass operating mode, the bypass output selection switch 443 is in a closed state to connect the bypass broadband matching network 442 to the output port RFOUT. When the bypass output selection switch 443 is a single-pole double-throw switch, when the low-noise amplifier is in the gain operating mode, the bypass output selection switch 443 connects the bypass broadband matching network 442 to the output port RFOUT; when the low-noise amplifier is in the bypass operating mode, the bypass output selection switch 443 connects the output matching circuit 430 to the output port RFOUT.

[0068] Optionally, the low noise amplifier further includes a control circuit 450. Figure 5As shown, the control circuit 450 is respectively coupled to the bypass input selection switch 441, the bypass broadband matching network 442, and the bypass output selection switch 443. For example, the control circuit 450 can be coupled to the control terminal of the bypass input selection switch 441, the control terminal of the bypass output selection switch 443, and the control terminal of each switch in the bypass broadband matching network 442. The control circuit 450 is configured to: in the bypass operating mode, control the bypass input selection switch 441 to be in a closed state, and control the bypass output selection switch 443 to conduct the bypass broadband matching network 442 and the output port RFOUT; in the gain operating mode, control the bypass input selection switch 441 to be in an open state, and control the bypass output selection switch 443 to conduct the output matching circuit 430 and the output port RFOUT. In practical applications, the control circuit 450 may not be integrated into the low-noise amplifier, but may reuse other processors or controllers. For example, the control circuit 450 may be a baseband processor or a radio frequency processor, etc. The embodiment of the present application does not make specific limitations on this.

[0069] Furthermore, the control circuit 450 can control the bypass input selection switch 441 and the bypass output selection switch 443 to be in a closed state or an open state through a control signal. For example, when the low noise amplifier is in a gain operating mode, the control circuit 450 can control the bypass input selection switch 441 to be in an open state through a bypass input selection switch control signal, and control the bypass output selection switch 443 to turn on the output matching circuit 430 and the output port RFOUT through a bypass output selection switch control signal, so as to control the RF signal to pass through the gain circuit 420; when the low noise amplifier is in a bypass operating mode, the control circuit 450 can control the bypass input selection switch 441 to be in a closed state through a bypass input selection switch control signal, so as to turn on the input matching circuit 410 and the bypass broadband matching network 442, and control the bypass output selection switch 443 to turn on the bypass broadband matching network 442 and the output port RFOUT through a bypass output selection switch control signal, so as to control the RF signal to pass through the bypass circuit 440.

[0070] The control circuit 450 may also be configured to control the bypass broadband matching network 442 to provide different matching impedances in the first frequency band and the second frequency band, respectively. For example, the control circuit 450 may control each switch in the bypass broadband matching network 442 to be open or closed via a bypass broadband matching network control signal, thereby providing different resonant frequencies based on different operating frequency bands to achieve impedance matching.

[0071] In one possible embodiment, Figure 6As shown, the bypass broadband matching network 442 includes: an adjustable inductor 4421 and an adjustable capacitor 4422; the first end of the adjustable inductor 4421 and the first end of the adjustable capacitor 4422 are both coupled to the second end of the bypass input selection switch 441, the second end of the adjustable inductor 4421 is grounded, and the second end of the adjustable capacitor 4422 is coupled to the first end of the bypass output selection switch 443.

[0072] It is understandable that the resonant frequency of the bypass broadband matching network 442 is related to the inductance of the adjustable inductor 4421. L And the capacitance value of the adjustable capacitor 4422 C Inversely proportional, that is, the resonant frequency f Satisfies the following formula:

[0073] .

[0074] When the frequency corresponding to the first frequency band f1 Less than the frequency corresponding to the second frequency band f2 When L1 Indicates the inductance value of the adjustable inductor 4421 corresponding to the first frequency band, C1 Represents the capacitance value of the adjustable capacitor 4422, and L2 Indicates the inductance value of the adjustable inductor 4421 corresponding to the second frequency band, C2 Represents the capacitance value of the adjustable capacitor 4422, then L1 、 L2 、 C1 and C2 The relationship between them satisfies the following relationship:

[0075] L1 × C1 > L2 × C2 .

[0076] Further, such as Figure 6 As shown, the bypass broadband matching network 442 may further include a first switch SW1. A first end of the first switch SW1 is coupled to a first end of the adjustable inductor 4421, and a second end of the first switch SW1 is grounded. When the low-noise amplifier is in the bypass operating mode, the first switch SW1 is in an open state. When the low-noise amplifier is in the gain operating mode, the first switch SW1 is in a closed state.

[0077] Specifically, when the low-noise amplifier is in the bypass operating mode, the control circuit 450 can control the first switch SW1 to be in the disconnected state, and the RF signal can be normally transmitted to the output port RFOUT of the low-noise amplifier after passing through the adjustable inductor 4421 and the adjustable capacitor 4422; when the low-noise amplifier is in the gain operating mode, the control circuit 450 can control the first switch SW1 to be in the closed state. At this time, the first switch SW1 is connected to the ground end, and the parasitic capacitance in the bypass circuit 440 can be grounded through the first switch SW1, which can enhance the reverse isolation in the gain operating mode and avoid causing oscillation of the gain circuit 420.

[0078] Optional, such as Figure 6 As shown, the adjustable inductor 4421 includes: a first inductor Lbyp1, a second inductor Lbyp2, a second switch SWL1 and a third switch SWL2.

[0079] The first end of the first inductor Lbyp1 is coupled to the second end of the bypass input selection switch 441, the second end of the first inductor Lbyp1 is coupled to the first end of the second switch SWL1 and the first end of the second inductor Lbyp2, respectively. The second end of the second switch SWL1 is grounded, and the second end of the second inductor Lbyp2 is grounded via the third switch SWL2. For example, the first inductor Lbyp1 and the second inductor Lbyp2 can be directly integrated on the chip. To save chip area, they can also be implemented by winding on a module carrier board or by mounting chip inductors. This is not specifically limited in this embodiment of the present application.

[0080] Specifically, the first inductor Lbyp1 and the second inductor Lbyp2 in the adjustable inductor 4421 can be coupled in series. When the second switch SWL1 is closed and the third switch SWL2 is disconnected, the inductance value of the adjustable inductor 4421 is the inductance value of the first inductor Lbyp1. When the second switch SWL1 is disconnected and the third switch SWL2 is closed, the inductance value of the adjustable inductor 4421 is the sum of the inductance values ​​of the first inductor Lbyp1 and the second inductor Lbyp2.

[0081] For example, when the frequency corresponding to the first frequency band is f1 Less than the frequency corresponding to the second frequency band f2 When the low noise amplifier operates in the first frequency band, the second switch SWL1 is in the open state and the third switch SWL2 is in the closed state; when the low noise amplifier operates in the second frequency band, the second switch SWL1 is in the closed state and the third switch SWL2 is in the open state.

[0082] Optional, such as Figure 6As shown, in an example, the adjustable capacitor 4422 includes: a first capacitor Cbyp1, a second capacitor Cbyp2, a fourth switch SWC1, a fifth switch SWC2 and a sixth switch SW2.

[0083] Among them, the first end of the fourth switch SWC1, the first end of the fifth switch SWC2 and the first end of the sixth switch SW2 are all coupled to the second end of the adjustable inductor 4421, the second end of the fourth switch SWC1 is coupled to the first end of the first capacitor Cbyp1, the second end of the fifth switch SWC2 is coupled to the first end of the second capacitor Cbyp2, and the second end of the first capacitor Cbyp1, the second end of the second capacitor Cbyp2 and the second end of the sixth switch SW2 are all coupled to the first end of the bypass output selection switch 443.

[0084] Specifically, the first capacitor Cbyp1 and the second capacitor Cbyp2 can be coupled in parallel; when the fourth switch SWC1 is closed, the fifth switch SWC2 is opened, and the sixth switch SW2 is opened, the capacitance value of the adjustable capacitor 4422 is the sum of the capacitance value of the first capacitor Cbyp1 and the capacitance value of the parasitic capacitance of the sixth switch SW2; when the fourth switch SWC1 is opened, the fifth switch SWC2 is closed, and the sixth switch SW2 is opened, the capacitance value of the adjustable capacitor 4422 is the sum of the capacitance value of the second capacitor Cbyp2 and the capacitance value of the parasitic capacitance of the sixth switch SW2. The sum of the capacitance values ​​of the parasitic capacitance of the switch SW2; when the fourth switch SWC1 is disconnected, the fifth switch SWC2 is disconnected, and the sixth switch SW2 is disconnected, the capacitance value of the adjustable capacitor 4422 is the capacitance value of the parasitic capacitance of the sixth switch SW2; when the fourth switch SWC1 is closed, the fifth switch SWC2 is closed, and the sixth switch SW2 is disconnected, the capacitance value of the adjustable capacitor 4422 is the sum of the capacitance values ​​of the first capacitor Cbyp1, the second capacitor Cbyp2, and the parasitic capacitance of the sixth switch SW2.

[0085] For example, when the frequency corresponding to the first frequency band is f1 Less than the frequency corresponding to the second frequency band f2 When the low noise amplifier operates in the first frequency band, the fourth switch SWC1 is in an open state, the fifth switch SWC2 is in an open state, or the fourth switch SWC1, the fifth switch SWC2, and the sixth switch SW2 are all in an open state; if the low noise amplifier operates in the second frequency band, the fourth switch SWC1 and the fifth switch SWC2 are in a closed state, and the sixth switch SW2 is in an open state.

[0086] In another example, the adjustable capacitor 4422 may not include the sixth switch SW2. Specifically, the first capacitor Cbyp1 and the second capacitor Cbyp2 may be coupled in parallel; when the fourth switch SWC1 is closed and the fifth switch SWC2 is disconnected, the capacitance value of the adjustable capacitor 4422 is the capacitance value of the first capacitor Cbyp1; when the fourth switch SWC1 is disconnected and the fifth switch SWC2 is closed, the capacitance value of the adjustable capacitor 4422 is the capacitance value of the second capacitor Cbyp2; when the fourth switch SWC1 is closed and the fifth switch SWC2 is closed, the capacitance value of the adjustable capacitor 4422 is the sum of the capacitance value of the first capacitor Cbyp1 and the capacitance value of the second capacitor Cbyp2. For example, when the frequency corresponding to the first frequency band is f1 Less than the frequency corresponding to the second frequency band f2 When the low noise amplifier operates in the first frequency band, the fourth switch SWC1 is in a closed state or the fifth switch SWC2 is in a closed state; when the low noise amplifier operates in the second frequency band, the fourth switch SWC1 and the fifth switch SWC2 are both in a closed state.

[0087] The following Figure 6 The circuit topology of the bypass broadband matching network 442 is shown as an example, combined with Figure 7 and Figure 8 , respectively illustrating a schematic diagram of a bypass working mode and a schematic diagram of a gain working mode of the low noise amplifier provided in an embodiment of the present application.

[0088] like Figure 7 As shown, in the bypass working mode, the gain circuit 420 is in a non-working state and the bypass circuit 440 is in a working state. After the RF signal enters the low noise amplifier from the input port RFIN, it passes through the input matching circuit 410 (inductor) and then passes through the first node N1. The parasitic capacitance at the first node N1 ( Figure 7The RF signal (not shown) is generated by the physical structure of the transistors in the gain circuit 420. The RF signal is then transmitted to the adjustable inductor 4421 and the adjustable capacitor 4422 (the first switch SW1 is in the open state) through the bypass input selection switch 441 (closed state), and finally output to the output port RFOUT through the switch SW3 (closed state) in the bypass output selection switch 443. For example, in the adjustable inductor 4421, the second switch SWL1 is closed and the third switch SWL2 is open. At this time, the effective inductance is the first inductor Lbyp1. In the adjustable capacitor 4422, the fourth switch SWC1 is closed, the fifth switch SWC2 is open, and the sixth switch SW2 is open. At this time, the effective capacitance in the adjustable capacitor 4422 is the capacitance of the first capacitor Cbyp1 and the parasitic capacitance of the sixth switch SW2 in parallel. The closed or open state of the switches in the adjustable inductor 4421 and the adjustable capacitor 4422 is merely an example and does not constitute a limitation on the embodiments of the present application.

[0089] like Figure 8 As shown, in gain operating mode, gain circuit 420 is in operation and bypass circuit 440 is in non-operation. After entering the low-noise amplifier at input port RFIN, the RF signal passes through input matching circuit 410 (inductor) and is then transmitted to gain circuit 420. After amplification by gain circuit 420, it passes sequentially through output matching circuit 430 and switch SW4 (closed) in bypass output selector 443, ultimately reaching output port RFOUT. At this point, in the bypass broadband matching network 442, except for the first switch SW1, which is closed, all other switches are open. The bypass input selector switch 441 is open, and the switch SW3 in bypass output selector 443 is also open.

[0090] In the first example, the following combination Figures 9-11 , which details the impedance matching results of the low-noise amplifier provided in the embodiment of the present application when the operating frequency band of the terminal receiver is n79 (4.4GHz-5.0GHz).

[0091] like Figure 9 As shown, after the RF signal enters the low noise amplifier from the input port RFIN, it first passes through the input matching circuit 410 (inductor) and then passes through the first node N1. There is a parasitic capacitor C at the first node N1. PThe RF signal is then transmitted through the bypass input selection switch 441 (closed) to the adjustable inductor 4421 and the adjustable capacitor 4422 (the first switch SW1 is open), and is ultimately output to the output port RFOUT through the switch SW3 (closed) in the bypass output selection switch 443. At this point, the second switch SWL1 is closed, and the third switch SWL2 is open. The effective inductance is the first inductor Lbyp1. In the adjustable capacitor 4422, the fourth switch SWC1 is closed, the fifth switch SWC2 is open, and the sixth switch SW2 is open. The effective capacitance of the adjustable capacitor 4422 is the parallel combination of the first capacitor Cbyp1 and the parasitic capacitance of the sixth switch SW2.

[0092] by Figure 9 The circuit structure shown in the example, combined with Figure 10 The impedance matching relationship of the low noise amplifier provided by the embodiment of the present application in bypass mode is analyzed from the Smith chart. The impedance of the input port RFIN is an ideal 50Ω. After the input matching inductor is connected in series, the impedance will move clockwise from the center of the circle on the Smith chart along the equal resistance circle to point a, as shown in FIG. Figure 10 As shown by the arrow in the middle; the parasitic capacitance C is connected in parallel at point a P , the impedance is along the isoconductance circle in the Smith chart ( Figure 10 (not shown) moves clockwise to node N1, as shown Figure 10 As shown by the middle arrow, the location of the first node N1 is Figure 9 The impedance at the first node N1 in the circuit is to offset the impedance caused by the parasitic capacitance C P The parasitic effect caused by the need for parallel inductors for impedance matching. It can be understood that the parasitic capacitance C contributed by the transistors in the gain circuit 420 in different frequency bands P The capacitance values ​​are not the same. In order to offset the parasitic capacitance C in different frequency bands P , the inductance values ​​of the inductors that need to be connected in parallel are also different. Taking 4.4GHz-5.0GHz as an example, the first inductor Lbyp1 can offset the parasitic capacitance C P The parasitic effects, such as Figure 10 As shown by the arrow in the middle, after the first inductor Lbyp1 is connected in parallel, the impedance can be moved counterclockwise along the equal conductance circle to point a. In order to match the output port RFOUT to 50Ω, that is, the impedance needs to be moved counterclockwise along the equal resistance circle to the center of the Smith chart. Only one more capacitor needs to be connected in series, as shown in Figure 10 Indicated by the arrow.

[0093] Figure 11 Figure 2 shows a schematic diagram of loss simulation of a low noise amplifier. Figure 11As shown, the horizontal axis represents frequency in GHz, and the vertical axis represents loss in dB (decibel). S(1,1) represents input return loss, S(2,2) represents output return loss, and S(2,1) represents forward transmission loss. Figure 11 It can be seen that within the 4.4 GHz to 5.0 GHz frequency band, the forward transmission loss of S(2,1) can be as low as -1.5 dB, achieving the low-loss requirement of the bypass operating mode over a wide bandwidth. The equivalent inductance of the adjustable inductor 4421 can be 1.4 nH (nanohenry), and the equivalent capacitance of the adjustable capacitor 4422 can be 0.8 pF (picofarad).

[0094] In the second example, the following combination Figure 12-13 , which details the impedance matching results of the low-noise amplifier provided in the embodiment of the present application when the operating frequency band of the terminal receiver is n77 (3.3GHz-4.2GHz).

[0095] like Figure 12 As shown, after the RF signal enters the low noise amplifier from the input port RFIN, it is limited by the input matching circuit 410 (inductor) and then passes through the first node N1. There is a parasitic capacitor C at the first node N1. P The RF signal is then transmitted through the bypass input selection switch 441 (closed) to the adjustable inductor 4421 and the adjustable capacitor 4422 (the first switch SW1 is open), and finally output to the output port RFOUT through the switch SW3 (closed) in the bypass output selection switch 443. At this time, the second switch SWL1 is open, and the third switch SWL2 is closed. The effective inductance is the series connection of the first inductor Lbyp1 and the second inductor Lbyp2. In the adjustable capacitor 4422, the fourth switch SWC1 is closed, the fifth switch SWC2 is closed, and the sixth switch SW2 is open. The effective capacitance of the adjustable capacitor 4422 is the parallel connection of the first capacitor Cbyp1, the second capacitor Cbyp2, and the parasitic capacitance of the sixth switch SW2.

[0096] Figure 13 Figure 2 shows a schematic diagram of loss simulation of a low noise amplifier. Figure 13 As shown, the horizontal axis represents frequency in GHz, and the vertical axis represents loss in dB (decibel). S(1,1) represents input return loss, S(2,2) represents output return loss, and S(2,1) represents forward transmission loss. Figure 13As can be seen, within the 3.3 GHz to 4.2 GHz frequency band, the forward transmission loss of S(2,1) can also reach -1.5 dB, achieving the low-loss requirement of the bypass operating mode over a wide bandwidth. The equivalent inductance of the adjustable inductor 4421 can be 2.6 nH, and the equivalent capacitance of the adjustable capacitor 4422 can be 1.3 pF.

[0097] An embodiment of the present application further provides a radio frequency chip, which includes a filter and a low-noise amplifier coupled to the filter. The low-noise amplifier may be the low-noise amplifier provided in the aforementioned embodiment.

[0098] An embodiment of the present application further provides a communication device, which includes an antenna and a radio frequency chip coupled to the antenna. The radio frequency chip may be the radio frequency chip provided in the aforementioned embodiment.

[0099] An embodiment of the present application further provides a computer-readable storage medium, which includes instructions. When the instructions are executed on the above-mentioned electronic device, the electronic device executes the impedance matching method in the above-mentioned low-noise amplifier embodiment.

[0100] An embodiment of the present application further provides a computer program product including instructions, which, when executed on the electronic device, enables the electronic device to execute the impedance matching method in the low-noise amplifier embodiment.

[0101] It is understood that all relevant contents of the above-mentioned low-noise amplifier embodiment can be referred to in the embodiments of the above-mentioned radio frequency chip, communication device, computer-readable storage medium, and computer program product, and the embodiments of this application are not further described here. In addition, the technical effects of the radio frequency chip, communication device, computer-readable storage medium, and computer program product can refer to the technical effects of the above-mentioned low-noise amplifier embodiment.

[0102] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0103] Those skilled in the art will appreciate that the modules and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0104] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and modules described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0105] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the modules is only a logical function division. In actual implementation, there may be other division methods, such as multiple modules or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or modules, which can be electrical, mechanical or other forms.

[0106] The modules described as separate components may or may not be physically separate, and the components shown as modules may or may not be physical modules, that is, they may be located on a single device or distributed across multiple devices. Some or all of the modules may be selected to achieve the purpose of this embodiment based on actual needs.

[0107] In addition, the functional modules in the various embodiments of the present application may be integrated into one device, or each module may exist physically separately, or two or more modules may be integrated into one device.

[0108] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A low noise amplifier, characterized in that The low-noise amplifier has an input port and an output port, and includes: an input matching circuit, a gain circuit, an output matching circuit, and a bypass circuit; the input port is coupled to the input end of the input matching circuit, the output end of the input matching circuit is coupled to the input end of the gain circuit and the input end of the bypass circuit respectively, the output end of the gain circuit is coupled to the input end of the output matching circuit, and the output end of the output matching circuit and the output end of the bypass circuit are both coupled to the output port; The low noise amplifier has a bypass working mode and a gain working mode; When the low-noise amplifier is in the bypass operating mode, the bypass circuit is configured to: provide different matching impedances in a first frequency band and a second frequency band, respectively, wherein the first frequency band and the second frequency band are different operating frequency bands; The input matching circuit includes an inductor, and the bypass circuit shares the inductor in the first frequency band and the second frequency band; The bypass circuit includes a bypass broadband matching network, a bypass input selection switch, and a bypass output selection switch, wherein a first terminal of the bypass input selection switch is coupled to the output terminal of the input matching circuit, a second terminal of the bypass input selection switch is coupled to the input terminal of the bypass broadband matching network, an output terminal of the bypass broadband matching network is coupled to a first terminal of the bypass output selection switch, an output terminal of the output matching circuit is coupled to a second terminal of the bypass output selection switch, and a third terminal of the bypass output selection switch is coupled to the output port; The bypass broadband matching network includes an adjustable inductor, an adjustable capacitor, and a first switch, wherein the adjustable inductor and the adjustable capacitor are used to provide different inductance values ​​and capacitance values ​​in the first frequency band and the second frequency band; The first end of the adjustable inductor and the first end of the adjustable capacitor are both coupled to the second end of the bypass input selection switch, the second end of the adjustable inductor is grounded, the first end of the adjustable capacitor is coupled to the first end of the bypass output selection switch, the first end of the first switch is coupled to the first end of the adjustable inductor, and the second end of the first switch is grounded; The adjustable inductor includes: a first inductor, a second inductor, a second switch, and a third switch; a first end of the first inductor is coupled to the second end of the bypass input selection switch, a second end of the first inductor is coupled to the first end of the second switch and the first end of the second inductor respectively, a second end of the second switch is grounded, and a second end of the second inductor is grounded through the third switch; The adjustable capacitor includes: a first capacitor, a second capacitor, a fourth switch, a fifth switch, and a sixth switch; a first end of the fourth switch, a first end of the fifth switch, and a first end of the sixth switch are all coupled to the first end of the adjustable inductor, a second end of the fourth switch is coupled to the first end of the first capacitor, a second end of the fifth switch is coupled to the first end of the second capacitor, and a second end of the first capacitor, a second end of the second capacitor, and a second end of the sixth switch are all coupled to the first end of the bypass output selection switch; In the gain working mode, the bypass input selection switch is in an off state, the bypass output selection switch conducts the output matching circuit and the output port, and the first switch is in a closed state; In the bypass working mode, the bypass input selection switch is in a closed state, the bypass output selection switch conducts the bypass broadband matching network and the output port, and the first switch is in an open state; In the bypass operating mode, when the frequency corresponding to the first frequency band is less than the frequency corresponding to the second frequency band: If the low noise amplifier operates in the first frequency band, the second switch is in an open state and the third switch is in a closed state, the fourth switch and the fifth switch are in a closed state, and the sixth switch is in an open state; If the low noise amplifier operates in the second frequency band, the second switch is in a closed state and the third switch is in an open state, the fourth switch is in a closed state, and the fifth switch and the sixth switch are both in an open state.

2. The low noise amplifier according to claim 1, wherein When the low noise amplifier is in the bypass operating mode, the bypass input selection switch is used to turn on the input matching circuit and the bypass broadband matching network; The bypass broadband matching network is used to provide different matching impedances in the first frequency band and the second frequency band respectively; The bypass output selection switch is used to conduct the bypass broadband matching network and the output port.

3. The low noise amplifier according to any one of claims 1 to 2, characterized in that: The low noise amplifier further includes a control circuit; The control circuit is configured to control the bypass input selection switch to be in a closed state and control the bypass output selection switch to conduct the bypass broadband matching network and the output port in the bypass operating mode; The control circuit is further configured to control the bypass input selection switch to be in an off state and control the bypass output selection switch to conduct the output matching circuit and the output port in the gain operating mode; The control circuit is further configured to control the bypass broadband matching network to provide different matching impedances in the first frequency band and the second frequency band, respectively.

4. A radio frequency chip, characterized in that: The radio frequency chip includes a filter and a low noise amplifier according to any one of claims 1 to 3 coupled to the filter.

5. A communication device, characterized in that: The communication device includes an antenna and the radio frequency chip according to claim 4 coupled to the antenna.

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