Low noise amplifier circuit, radio frequency front-end module and control method

Abstract

The present invention discloses a low-noise amplifier circuit, a radio frequency front-end module and a control method. The low-noise amplifier circuit includes a radio frequency amplifier circuit and a feedback bypass circuit; the radio frequency amplifier circuit is configured to receive a radio frequency input signal, amplify the radio frequency input signal, and output a radio frequency amplified signal; the feedback bypass circuit is coupled to the input end of the radio frequency amplifier circuit at one end and coupled to the output end of the radio frequency amplifier circuit at the other end; the feedback bypass circuit is configured to form a feedback path when the low-noise amplifier circuit is in a signal amplification mode, and to form a bypass path when the low-noise amplifier circuit is in a bypass mode. This technical solution can take into account the realization of the signal amplification mode and the bypass mode of the low-noise amplifier circuit through a feedback bypass circuit. The feedback bypass circuit can not only ensure the stability of the low-noise amplifier circuit in a high-gain mode, but also provide a configuration method for multiple gain gears.

Description

Technical Field

[0001] The present invention relates to the field of radio frequency front-end technology, and in particular to a low-noise amplifier circuit, a radio frequency front-end module and a control method. Background Art

[0002] In the field of radio frequency technology, a receiving link for receiving radio frequency signals is generally included. The receiving link includes a low noise amplifier. As the first stage of the receiving link, the low noise amplifier may need to amplify the radio frequency received signal from the antenna. In radio frequency (RF) applications, in order to effectively process signals of different power levels received by the radio frequency, the low noise amplifier circuit often needs to be in different working modes. For example, the low noise amplifier circuit needs to work in bypass mode or in amplification mode; because different working modes have different performance requirements for the low noise amplifier circuit, higher requirements are placed on the overall performance of the low noise amplifier circuit, and the design difficulty of the low noise amplifier circuit is greatly increased. Summary of the invention

[0003] The embodiments of the present invention provide a low-noise amplifier circuit, a radio frequency front-end module and a control method to solve the problem of poor performance of the low-noise amplifier circuit.

[0004] A low-noise amplifier circuit, comprising a radio frequency amplifier circuit and a feedback bypass circuit;

[0005] The RF amplification circuit is configured to receive a RF input signal, amplify the RF input signal, and output a RF amplified signal;

[0006] The feedback bypass circuit has one end coupled to the input end of the radio frequency amplification circuit and the other end coupled to the output end of the radio frequency amplification circuit;

[0007] The feedback bypass circuit is configured to form a feedback path when the low-noise amplifier circuit is in a signal amplification mode, and to form a bypass path when the low-noise amplifier circuit is in a bypass mode.

[0008] Furthermore, the feedback bypass circuit includes a common network and a gating network, and the common network and the gating network are connected in series between the input end and the output end of the radio frequency amplification circuit.

[0009] Further, the gating network includes a first gating unit and a second gating unit;

[0010] When the radio frequency amplification circuit is in a signal amplification mode, the first gating unit is connected in series with the public network to form a feedback path;

[0011] When the radio frequency amplifying circuit is in bypass mode, the second gating unit is connected in series with the public network to form a bypass path.

[0012] Further, when the low-noise amplifier circuit is in bypass mode, the impedance of the second gating unit is smaller than the impedance of the first gating unit.

[0013] Furthermore, the common network includes a first capacitor.

[0014] Furthermore, the first gating unit includes a feedback resistor.

[0015] Furthermore, the second gating unit includes a bypass switch. When the low-noise amplifier circuit is in a signal amplification mode, the bypass switch is opened, and when the low-noise amplifier circuit is in a bypass mode, the bypass switch is closed.

[0016] Furthermore, the second gating unit further includes a bypass element connected in series with the bypass switch, and an impedance of the bypass element is smaller than an impedance of the feedback resistor.

[0017] Furthermore, the bypass element is a first resistor.

[0018] A radio frequency front-end module comprises the above-mentioned low-noise amplifier circuit.

[0019] A control method for a low-noise amplifier circuit comprises: receiving a control signal, and controlling the working mode of the low-noise amplifier circuit according to the control signal, so that the feedback bypass circuit forms a feedback path when the low-noise amplifier circuit is in a signal amplification mode, and forms a bypass path when the low-noise amplifier circuit is in a bypass mode.

[0020] The above-mentioned low-noise amplifier circuit, RF front-end module and control method, the low-noise amplifier circuit includes an RF amplifier circuit and a feedback bypass circuit; the feedback bypass circuit has one end coupled to the input end of the RF amplifier circuit and the other end coupled to the output end of the RF amplifier circuit; in the bypass mode, the feedback bypass circuit bypasses the RF input signal to the output end of the low-noise amplifier circuit, and the signal amplification mode and the bypass mode of the low-noise amplifier circuit can be achieved through a feedback bypass circuit. The feedback bypass circuit can not only ensure the stability of the low-noise amplifier circuit in the high-gain mode, but also provide a configuration method for multiple gain gears, and also improve the integration of the low-noise amplifier circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0022] Figure 1 is a circuit diagram of a low noise amplifier circuit in one embodiment of the present invention;

[0023] Figure 2 is another circuit diagram of a low noise amplifier circuit in one embodiment of the present invention;

[0024] Figure 3 is another circuit diagram of a low noise amplifier circuit in one embodiment of the present invention;

[0025] Figure 4 is another circuit diagram of a low noise amplifier circuit in one embodiment of the present invention;

[0026] Figure 5 is another circuit diagram of a low noise amplifier circuit in one embodiment of the present invention;

[0027] Figure 6 2 is another circuit diagram of a low noise amplifier circuit in one embodiment of the present invention.

[0028] In the figure: 10, RF amplifier circuit; 20, feedback bypass circuit; 21, public network; 22, gating network; 221, first gating unit; 222, second gating unit; 2221, bypass element; 30, post-stage amplifier circuit; 40, gain adjustment circuit. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] It should be understood that the present invention can be implemented in different forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, providing these embodiments will make the disclosure thorough and complete and fully convey the scope of the present invention to those skilled in the art. In the accompanying drawings, the sizes and relative sizes of layers and regions may be exaggerated for clarity. The same reference numerals throughout represent the same elements.

[0031] It should be understood that when an element or layer is referred to as being "on, "adjacent to, "connected to, "connected to, or "coupled to" other elements or layers, it may be directly on, adjacent to, connected to, or coupled to other elements or layers, or there may be intervening elements or layers. In contrast, when an element is referred to as being "directly on, "directly adjacent to, "directly connected to, "or "directly coupled to, " other elements or layers, there are no intervening elements or layers. It should be understood that although the terms first, second, third, etc. may be used to describe various elements, components, regions, layers, and / or parts, these elements, components, regions, layers, and / or parts should not be limited by these terms. These terms are merely used to distinguish one element, component, region, layer, or part from another element, component, region, layer, or part. Therefore, without departing from the teachings of the present invention, the first element, component, region, layer, or part discussed below may be represented as a second element, component, region, layer, or part.

[0032] Spatially relative terms such as "under," "beneath," "below," "under," "above," "above," and the like may be used herein for ease of description to describe the relationship of an element or feature shown in the figures to other elements or features. It should be understood that the spatially relative terms are intended to include different orientations of the device in use and operation in addition to the orientations shown in the figures. For example, if the device in the accompanying drawings is flipped, then the elements or features described as "under other elements" or "under" or "under" will be oriented as "on" the other elements or features. Thus, the exemplary terms "under" and "under" may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or other orientations) and the spatial descriptors used herein are interpreted accordingly.

[0033] The purpose of the terms used herein is only to describe specific embodiments and is not intended to be limiting of the present invention. When used herein, the singular forms "a", "an" and " / the" are also intended to include plural forms, unless the context clearly indicates another way. It should also be understood that the terms "consisting of" and / or "comprising" when used in this specification determine the presence of features, integers, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups. When used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0034] In order to fully understand the present invention, detailed structures and steps will be presented in the following description to illustrate the technical solutions proposed by the present invention. The preferred embodiments of the present invention are described in detail below, but in addition to these detailed descriptions, the present invention may also have other implementations.

[0035] This embodiment provides a low noise amplifier circuit. Figure 1 As shown, the low-noise amplifier circuit includes an RF amplifier circuit 10 and a feedback bypass circuit 20; the RF amplifier circuit 10 is configured to receive an RF input signal, amplify the RF input signal, and output an RF amplified signal; the feedback bypass circuit 20 is coupled to the input end of the RF amplifier circuit 10 at one end and to the output end of the RF amplifier circuit 10 at the other end; wherein the feedback bypass circuit 20 is configured to form a feedback path when the low-noise amplifier circuit is in a signal amplification mode, and to form a bypass path when the low-noise amplifier circuit is in a bypass mode.

[0036] Specifically, the RF input signal is a signal to be amplified. The RF amplified signal is a signal obtained after the RF input signal is amplified by the RF amplifier circuit 10. The signal amplification mode is a mode in which the RF input signal needs to be amplified by the RF amplifier circuit 10 in the low-noise amplifier circuit. The bypass mode is a mode in which the RF input signal does not need to be amplified by the RF amplifier circuit 10 in the low-noise amplifier circuit.

[0037] In a specific embodiment, when the low noise amplifier circuit is in the signal amplification mode, a feedback path is formed.

[0038] In a specific embodiment, when the low-noise amplifier circuit is in bypass mode, a bypass path is formed; at this time, the RF amplifier circuit 10 does not work, and the RF input signal is bypassed through the bypass path to the output end of the low-noise amplifier circuit, and then transmitted to the subsequent circuit for signal processing.

[0039] As an example, the low-noise amplifier circuit also includes a signal input terminal Vin and a signal output terminal Vout. The signal input terminal Vin is a port for receiving a radio frequency input signal. The signal output terminal Vout is a port for outputting a radio frequency amplified signal. The radio frequency amplifier circuit 10 is arranged between the signal input terminal Vin and the signal output terminal Vout, and is configured to receive a radio frequency input signal, amplify the radio frequency input signal, and output a radio frequency amplified signal. In this example, the radio frequency amplifier circuit 10 may include a plurality of radio frequency amplifier transistors connected in series. The radio frequency amplifier transistor may be a BJT transistor (for example, an HBT transistor) or a field effect transistor, so as to realize that when the low-noise amplifier circuit is in a signal amplification mode, the radio frequency input signal is amplified multiple times to improve the gain of the low-noise amplifier circuit. For example, the radio frequency amplifier circuit 10 includes a first amplifier transistor M11 and a second amplifier transistor M12 connected in series. When the first amplifier transistor M11 and the second amplifier transistor M12 are both BJT transistors, the first amplifier transistor M11 and the second amplifier transistor M12 may both be NPN transistors.

[0040] In a specific embodiment, the low-noise amplifier circuit further includes a DC blocking capacitor C11 disposed between the signal input terminal Vin and the input terminal of the RF amplifier circuit 10. The DC blocking capacitor C11 is configured to block the DC signal in the RF input signal. One end of the DC blocking capacitor C11 is connected to the signal input terminal Vin, and the other end is connected to the connection node between the feedback bypass circuit 20 and the input terminal of the RF amplifier circuit 10, or one end of the DC blocking capacitor C11 is connected to the connection node between the feedback bypass circuit 20 and the input terminal of the RF amplifier circuit 10, and the other end is connected to the input terminal of the first amplifying transistor 11.

[0041] The base (gate) of the first amplifying transistor M11 is connected to the DC blocking capacitor C11, and the collector (source) is connected to the emitter (drain) of the second amplifying transistor M12. The emitter (drain) of the first amplifying transistor M11 is connected to the ground terminal through the inductor L41, and is configured to amplify the RF input signal for the first time in the signal amplification mode. The base (gate) of the second amplifying transistor M12 is connected to the power supply terminal VDD, and the collector (source) is connected to the signal output terminal Vout, and is connected to the feed power supply VDD through the load inductor L1. The second amplifying transistor M12 is configured to amplify the RF input signal for the second time in the signal amplification mode to achieve high gain of the low-noise amplifier circuit.

[0042] As another example, one end of the feedback bypass circuit 20 is coupled to the input end of the RF amplifier circuit 10, and the other end is coupled to the output end of the RF amplifier circuit 10. When the low-noise amplifier circuit is in the signal amplification mode, that is, when the RF amplifier circuit 10 in the low-noise amplifier circuit performs signal amplification processing on the RF input signal, in order to ensure the stability of the low-noise amplifier circuit, the feedback bypass circuit 20 adjusts the RF input signal according to the RF amplification signal output by the RF amplifier circuit 10, so as to make the low-noise amplifier circuit more stable, thereby improving the linearity of the low-noise amplifier circuit.

[0043] As another example, when the low-noise amplifier circuit is in bypass mode, that is, when the RF amplifier circuit 10 in the low-noise amplifier circuit is not needed to amplify the RF input signal, the RF amplifier circuit 10 does not work, and the RF input signal is transmitted to the output end of the low-noise amplifier circuit through the feedback bypass circuit 20, and then transmitted to the subsequent circuit for signal processing. In this example, a feedback bypass circuit 20 can be used to achieve both the signal amplification mode and the bypass mode of the low-noise amplifier circuit. The feedback bypass circuit 20 can not only ensure the stability of the low-noise amplifier circuit in the high-gain mode, but also provide a configuration method for multiple gain gears.

[0044] In this embodiment, the low-noise amplifier circuit includes a radio frequency amplifier circuit 10 and a feedback bypass circuit 20; the feedback bypass circuit 20 has one end coupled to the input end of the radio frequency amplifier circuit 10 and the other end coupled to the output end of the radio frequency amplifier circuit 10; in the signal amplification mode, the feedback bypass circuit 20 adjusts the radio frequency input signal according to the radio frequency amplification signal output by the radio frequency amplifier circuit 10, and in the bypass mode, the feedback bypass circuit 20 bypasses the radio frequency input signal to the output end of the low-noise amplifier circuit. Through a feedback bypass circuit 20, the signal amplification mode and the bypass mode of the low-noise amplifier circuit can be realized. Through the feedback bypass circuit 20, the stability of the low-noise amplifier circuit in the high gain mode can be guaranteed, and a configuration method for multiple gain gears is also provided.

[0045] In one embodiment, if Figure 2 As shown, the feedback bypass circuit 20 includes a common network 21 and a gating network 22 , and the common network 21 and the gating network 22 are connected in series between the input end and the output end of the radio frequency amplifying circuit 10 .

[0046] As an example, the common network 21 and the gating network 22 are connected in series, the common network 21 is connected to the input end of the RF amplifier circuit 10, and the gating network 22 is connected to the output end of the RF amplifier circuit 10. In the signal amplification mode, the common network 21 and the gating network 22 form a feedback path to adjust the RF input signal according to the RF amplification signal output by the RF amplifier circuit 10. In the bypass mode, the common network 21 and the gating network 22 form a bypass path to bypass the RF input signal to the output end of the low-noise amplifier circuit, thereby ensuring the gain and stability of the low-noise amplifier circuit while also improving the integration of the low-noise amplifier circuit.

[0047] As another example, the common network 21 and the gating network 22 are connected in series, the common network 21 is connected to the output end of the RF amplifier circuit 10, and the gating network 22 is connected to the input end of the RF amplifier circuit 10. This connection method can also form a feedback path between the common network 21 and the gating network 22 in the signal amplification mode, and adjust the RF input signal according to the RF amplification signal output by the RF amplifier circuit 10. In the bypass mode, the common network 21 and the gating network 22 form a bypass path, and bypass the RF input signal to the output end of the low-noise amplifier circuit, thereby ensuring the gain and stability of the low-noise amplifier circuit while also improving the integration of the low-noise amplifier circuit.

[0048] In this embodiment, the feedback bypass circuit 20 is connected in series with the common network 21 and the selection network 22 between the input and output ends of the RF amplifier circuit 10, so that the RF input signal can be processed differently in the signal amplification mode and the bypass mode. The signal amplification mode and the bypass mode of the low-noise amplifier circuit can be realized by a feedback bypass circuit 20. The feedback bypass circuit 20 can not only ensure the stability of the low-noise amplifier circuit in the high gain mode, but also provide a configuration method for multiple gain gears.

[0049] In one embodiment, if Figure 3 As shown, the gating network 22 includes a first gating unit 221 and a second gating unit 222; when the RF amplifier circuit 10 is in a signal amplification mode, the first gating unit 221 is connected in series with the public network 21 to form a feedback path; when the RF amplifier circuit 10 is in a bypass mode, the second gating unit 222 is connected in series with the public network 21 to form a bypass path.

[0050] As an example, when the low-noise amplifier circuit is in the signal amplification mode, in order to ensure the stability of the low-noise amplifier circuit, the common network 21 and the first selection unit 221 are connected in series to form a feedback path, through which the RF input signal can be adjusted according to the RF amplification signal output by the RF amplifier circuit 10, thereby ensuring the stability of the low-noise amplifier circuit.

[0051] As another example, when the low-noise amplifier circuit is in bypass mode, that is, when the RF amplifier circuit 10 in the low-noise amplifier circuit is not needed to amplify the RF input signal, the RF amplifier circuit 10 does not work, and the RF input signal is connected in series with the public network 21 through the second selection unit 222 to form a bypass path and is transmitted to the output end of the low-noise amplifier circuit, and then transmitted to the subsequent circuit for signal processing.

[0052] In this embodiment, when the low-noise amplifier circuit is in the signal amplification mode, the common network 21 and the first selection unit 221 are connected in series to form a feedback path. When the RF amplifier circuit 10 is in the bypass mode, the RF amplifier circuit 10 does not work, and the second selection unit 222 is connected in series with the common network 21 to form a bypass path. This ensures the gain and stability of the low-noise amplifier circuit while reducing the circuit complexity of the low-noise amplifier circuit to improve the integration of the low-noise amplifier circuit.

[0053] In one embodiment, when the RF amplifying circuit 10 is in bypass mode, the impedance of the second gating unit 222 is smaller than the impedance of the first gating unit 221 .

[0054] In this embodiment, when the RF amplifier circuit 10 is in bypass mode, the impedance of the second gating unit 222 is less than the impedance of the first gating unit 221, so that when the low-noise amplifier circuit is in bypass mode and the second gating unit 222 is connected in series with the public network 21 to form a bypass path, the RF input signal is transmitted to the output end of the RF amplifier circuit 10 through the bypass path, thereby preventing the RF input signal from leaking into the feedback path.

[0055] In one embodiment, if Figure 4 As shown, the public network 21 includes a first capacitor C211; one end of the first capacitor C211 is connected to the input end or the output end of the RF amplifier circuit 10, and the other end is respectively connected to the first end of the first selection unit 221 and the first end of the second selection unit 222. The first capacitor C211 is a capacitor for filtering DC signals.

[0056] In this embodiment, one end of the first capacitor C211 is connected to the input end or the output end of the RF amplifier circuit 10, and the other end is respectively connected to the first end of the first selection unit 221 and the first end of the second selection unit 222, and is configured to filter the DC signal flowing through the feedback path in the signal amplification mode, and filter the DC signal flowing through the bypass path in the bypass mode, so as to prevent the DC signal from causing zero point drift of the low-noise amplifier circuit, causing instability and distortion in operation, so as to ensure the stability of the low-noise amplifier circuit.

[0057] In one embodiment, if Figure 4 As shown, the first selection unit 221 includes a feedback resistor R2211; the feedback resistor R2211 has one end connected to the public network 21 and the other end coupled to the output or input end of the RF amplifier circuit 10, and is configured to form a feedback path with the public network 21 in the signal amplification mode.

[0058] Among them, the feedback resistor R2211 is a resistor used to form a feedback path with the public network 21. The resistance value of the feedback resistor R2211 can be customized according to actual conditions, and it is only necessary to ensure that the total impedance value of the feedback resistor R2211 is greater than the impedance value of the resistor in the bypass path. In this way, when the low-noise amplifier circuit is in the bypass mode, since the impedance value on the feedback path is much greater than the impedance value on the bypass path, the RF input signal can be transmitted to the output end of the low-noise amplifier circuit through the bypass path, so as to ensure the stability of the low-noise amplifier circuit while improving the integration of the low-noise amplifier circuit.

[0059] In this embodiment, the feedback resistor R2211 has one end connected to the public network 21 and the other end coupled to the output end of the RF amplifier circuit 10, and is configured to form a feedback path with the public network 21 in the signal amplification mode. The feedback path adjusts the RF input signal according to the RF amplification signal output by the RF amplifier circuit 10 to ensure the stability of the low-noise amplifier circuit.

[0060] In one embodiment, if Figure 4 As shown, the second selection unit 222 includes a bypass switch S2221; when the low noise amplifier circuit is in the signal amplification mode, the bypass switch S2221 is opened, and when the low noise amplifier circuit is in the bypass mode, the bypass switch S2221 is closed.

[0061] The bypass switch S2221 is a switch for switching the working mode of the low-noise amplifier circuit. When the RF amplifier circuit 10 is in the signal amplification mode, the bypass switch S2221 is disconnected, and the RF amplifier circuit 10 amplifies the RF input signal; when the low-noise amplifier circuit is in the bypass mode, the RF amplifier circuit 10 does not work, the bypass switch S2221 is closed, and is connected in series with the first capacitor C211 to form a bypass path.

[0062] In a specific embodiment, when the RF amplifier circuit 10 is in the signal amplification mode, the bypass switch S2221 is disconnected, and the impedance value of the bypass switch S in the disconnected state is infinite, and the RF input signal cannot be transmitted to the output end of the RF amplifier circuit 10 through the bypass path. At this time, the feedback bypass circuit 20 can adjust the RF input signal according to the RF amplified signal output by the RF amplifier circuit 10. When the low-noise amplifier circuit is in the bypass mode, the bypass switch S2221 is closed, and the impedance value of the bypass switch S in the closed state is very small, which is much larger than the resistance value of the feedback resistor R2211 in the feedback path. At this time, the RF amplifier circuit 10 does not work, and the RF input signal is transmitted to the output end of the RF amplifier circuit 10 through the bypass path.

[0063] As an example, in the bypass mode, the bypass switch S2221 is closed and connected in series with the first capacitor C211 to form a bypass path. Since the impedance value of the feedback path is greater than the impedance value of the bypass path, the RF input signal is bypassed through the bypass path to the output end of the low-noise amplifier circuit. It should be noted that in the signal amplification mode, in order to prevent the RF input signal from being transmitted to the output end of the low-noise amplifier circuit through the bypass path, the bypass switch S2221 needs to be in an open state.

[0064] In this embodiment, the bypass switch S2221 has one end connected to the public network 21 and the other end coupled to the output / input end of the RF amplifier circuit 10, and is configured to be connected in series with the first capacitor C211 to form a bypass path in the bypass mode. In the bypass mode, the RF input signal is bypassed and transmitted to the output end of the low-noise amplifier circuit to ensure the stability of the low-noise amplifier circuit while improving the integration of the low-noise amplifier circuit.

[0065] In one embodiment, if Figure 5 As shown, the second gating unit 222 further includes a bypass element 2221 connected in series with the bypass switch S2221; the impedance of the bypass element 2221 should be smaller than the impedance of the feedback resistor R2211.

[0066] The bypass element 2221 is an element that attenuates the RF input signal. In this embodiment, the impedance corresponding to the feedback resistor R2211 should be greater than the impedance corresponding to the bypass element 2221; thereby, when the low-noise amplifier circuit is in bypass mode and the bypass switch S2221 is closed, the RF input signal is transmitted to the output end of the RF amplifier circuit 10 through the bypass path, thereby preventing the RF input signal from leaking into the feedback path.

[0067] It should be noted that in order to prevent the bypass element 2221 from causing excessive loss to the low noise amplifier circuit, the impedance of the bypass element 2221 should be as small as possible without affecting the stability of the low noise amplifier circuit. For example, the impedance of the bypass element 2221 is less than 10 ohms.

[0068] As an example, when the low-noise amplifier circuit is in bypass mode, in order to ensure the stability of the low-noise amplifier circuit, the second selection unit 222 also includes a bypass element 2221 connected in series with the bypass switch S2221; the bypass switch S2221 and the bypass element 2221 are connected in series, and when the low-noise amplifier circuit is in bypass mode, the bypass switch S2221, the bypass element 2221 and the first capacitor C211 are connected in series to form a bypass path, and the RF input signal passes through the bypass path formed by the bypass element 2221, the bypass switch S2221, the bypass element 2221 and the first capacitor C211, and is transmitted to the output end of the low-noise amplifier circuit.

[0069] In this embodiment, the second selection unit 222 also includes a bypass element 2221 connected in series with the bypass switch S2221. After the RF input signal is stabilized by the bypass element 2221, it is bypassed and transmitted to the output end of the low-noise amplifier circuit, thereby improving the stability of the low-noise amplifier circuit in the bypass mode.

[0070] In one embodiment, if Figure 6As shown, the bypass element 2221 is a first resistor R2221, which is configured such that in the bypass mode, the RF input signal passes through the bypass element 2221 for signal stabilization, thereby improving the stability of the low-noise amplifier circuit in the bypass mode.

[0071] In one embodiment, if Figure 4 As shown, the low noise amplifier circuit also includes a post-stage amplifier circuit 30; the post-stage amplifier circuit 30 can be an output matching circuit or an attenuation circuit to perform post-stage signal processing on the RF amplified signal after being amplified by the RF amplifier circuit 10, or the signal transmitted to the output end via the bypass path by the RF input signal. The post-stage amplifier circuit 30 is configured to receive the RF amplified signal output by the RF amplifier circuit 10 in the signal amplification mode; in the bypass mode, receive the RF input signal bypassed by the feedback bypass circuit 20; so as to further perform post-stage processing on the RF amplified signal output by the RF amplifier circuit 10 or the RF signal transmitted to the output end via the bypass path.

[0072] Furthermore, if Figure 4 As shown, the low noise amplifier circuit also includes a gain adjustment circuit 40; the gain adjustment circuit 40 is connected to the RF amplifier circuit 10 at one end and to the ground at the other end, and is configured to perform gain adjustment on the RF amplifier circuit 10.

[0073] As an example, Figure 4 As shown, the gain adjustment circuit 40 includes a gain adjustment inductor L41, one end of which is connected to the RF amplifier circuit 10 and the other end is connected to the ground. The gain adjustment inductor L41 is configured to perform gain adjustment on the RF amplifier circuit 10 to improve the gain and linearity of the low-noise amplifier circuit.

[0074] A radio frequency front-end module includes the above-mentioned low-noise amplifier circuit, which can realize the signal amplification mode and bypass mode of the low-noise amplifier circuit through a feedback bypass circuit 20, thereby ensuring the gain and stability of the low-noise amplifier circuit while further improving the integration of the low-noise amplifier circuit.

[0075] A control method for a low-noise amplifier circuit includes: receiving a control signal, and controlling the working mode of the low-noise amplifier circuit according to the control signal, so that the feedback bypass circuit 20 forms a feedback path when the low-noise amplifier circuit is in a signal amplification mode, and forms a bypass path when the low-noise amplifier circuit is in a bypass mode. The present application controls the low-noise amplifier circuit through a control signal to form a feedback path when the low-noise amplifier circuit is in a signal amplification mode, and to form a bypass path when the low-noise amplifier circuit is in a bypass mode, that is, through a feedback bypass circuit 20, the realization of the signal amplification mode and the bypass mode of the low-noise amplifier circuit can be taken into account. The feedback bypass circuit 20 can not only ensure the stability of the low-noise amplifier circuit in a high-gain mode, but also provide a configuration method for multiple gain gears.

[0076] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A low noise amplifier circuit, characterized in that: The low-noise amplifier circuit includes a radio frequency amplifier circuit and a feedback bypass circuit; The RF amplification circuit is configured to receive a RF input signal, amplify the RF input signal, and output a RF amplified signal; The feedback bypass circuit has one end coupled to the input end of the radio frequency amplification circuit and the other end coupled to the output end of the radio frequency amplification circuit; Wherein, the feedback bypass circuit is configured to form a feedback path when the low-noise amplifier circuit is in a signal amplification mode, and to form a bypass path when the low-noise amplifier circuit is in a bypass mode; The feedback bypass circuit includes a common network and a gating network, wherein the common network and the gating network are connected in series between the input end and the output end of the radio frequency amplification circuit, and are used to perform different processing on the radio frequency input signal in the signal amplification mode and the bypass mode; The gating network includes a first gating unit and a second gating unit, the first gating unit includes a feedback resistor, the second gating unit includes a bypass switch and a bypass element connected in series with the bypass switch, the impedance of the bypass element is less than the impedance of the feedback resistor; the bypass element is a first resistor, which is used to attenuate the RF input signal.

2. The low noise amplifier circuit according to claim 1, characterized in that: When the radio frequency amplification circuit is in a signal amplification mode, the first gating unit is connected in series with the public network to form a feedback path; When the radio frequency amplifying circuit is in bypass mode, the second gating unit is connected in series with the public network to form a bypass path.

3. The low noise amplifier circuit according to claim 2, characterized in that: When the low-noise amplifier circuit is in a bypass mode, the impedance of the second gating unit is smaller than the impedance of the first gating unit.

4. The low noise amplifier circuit according to claim 1, characterized in that: The common network includes a first capacitor.

5. The low noise amplifier circuit according to claim 4, characterized in that: When the low-noise amplifier circuit is in the signal amplification mode, the bypass switch is opened, and when the low-noise amplifier circuit is in the bypass mode, the bypass switch is closed.

6. A radio frequency front-end module, characterized in that: A low-noise amplifier circuit comprising any one of claims 1 to 5.

7. A control method for a low noise amplifier circuit as claimed in any one of claims 1 to 5, characterized in that: include: A control signal is received, and an operating mode of the low-noise amplifier circuit is controlled according to the control signal, so that the feedback bypass circuit forms a feedback path when the low-noise amplifier circuit is in a signal amplification mode, and forms a bypass path when the low-noise amplifier circuit is in a bypass mode.

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