Multi-input LNA, radio frequency module and electronic equipment

Abstract

The invention discloses a multi-input LNA, a radio frequency module and electronic equipment. The multi-input LNA comprises a plurality of amplification units which are connected with one another; the amplification unit comprises a first electrode, a second electrode and a control end; the first poles of the amplification units are grounded through the same inductor; the second electrode of the amplification unit is connected with the output end of the multi-input LNA through a switching device; when the switching device connected with the amplifying unit is switched on, the amplifying unit is in a working mode, and when the switching device is switched off, the amplifying unit is in a non-working mode; the control end of each amplification unit is respectively used as an input end of the multi-input LNA, and the control end is respectively connected with a matching circuit; at least one input end is connected with an adjusting circuit; the adjusting circuit is used for providing an alternating current path for the control end of the amplifying unit when the connected amplifying unit is in a non-working mode so as to adjust the resonant frequency of the amplifying unit. According to the invention, the interference of the non-working mode amplification unit on the working mode amplification unit can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of amplifiers, and more specifically, to a multi-input LNA, a radio frequency module and an electronic device. Background Art

[0002] As an important component in the RF module, the low noise amplifier (LNA) is an active module. LNA is critical to the performance of the receiver system. It is used to obtain extremely weak and uncertain signals from the antenna and amplify them, while also identifying noise. Its main parameters include noise figure, gain, input and output matching, linearity, reverse isolation, etc.

[0003] Before the 5G communication era, since separate RF front-end devices can also meet the performance requirements of electronic equipment, RF front-end modules (or RF modules, separate devices are often used during the RF back-end) are generally used in high-end devices, and separate RF front-end devices are used in low-end devices. In the 5G era, due to the sharp increase in the demand for the number of RF components of a single product, the area occupied by discrete device solutions exceeds the acceptable limit, and the debugging time will be longer, so modularization has become a development trend in the mobile communication market. Modules are divided into FEMiD (integrated switch, filter and duplexer), PAMiD (integrated multi-mode multi-band PA and FEMiD), LPAMiD (PAMiD plus LNA), DiFEM (RF switch and filter), LFEM (RF switch, LNA and filter), etc.

[0004] For RF modules including LNA, multi-input LNA is required to meet the multi-band input requirements. Multi-input LNA includes multiple amplification units, each of which corresponds to an input terminal. When one input terminal is working, the amplification units connected to other input terminals need to be turned off. In conventional multi-input LNA, the turned-off amplification units will interfere with the amplification units in working state, resulting in large in-band noise of the multi-input LNA. Summary of the invention

[0005] In view of this, the present application provides a multi-input LNA, a radio frequency module and an electronic device, and the scheme is as follows:

[0006] In a first aspect, the present application provides a multi-input LNA, comprising: a plurality of interconnected amplification units; the amplification units comprising a first pole, a second pole and a control terminal;

[0007] The first electrodes of the amplifying units are all grounded through the same inductor; the second electrodes of the amplifying units are respectively connected to the output end of the multi-input LNA through a switch device; when the switch device connected to the amplifying unit is turned on, the amplifying unit is in a working mode, and when the switch device is turned off, the amplifying unit is in a non-working mode; the control end of each amplifying unit is respectively used as an input end of the multi-input LNA, and the control end is respectively connected to a matching circuit;

[0008] Among them, at least one input end is connected to a regulating circuit; the regulating circuit is used to provide an AC path for the control end of the amplifying unit when the connected amplifying unit is in a non-operating mode, so as to adjust the resonant frequency of the amplifying unit.

[0009] Optionally, in the above multi-input LNA, the control ends of the amplification units are respectively connected to a regulating circuit.

[0010] In one implementation, the regulating circuit may be connected to a digital control circuit, and the enabling state of the regulating circuit may be controlled by the digital control circuit.

[0011] Optionally, in the above multi-input LNA, the regulating circuit is used to provide an AC path with an equivalent resistance less than a target value for the control terminal of the amplifying unit when the connected amplifying unit is in a non-operating mode.

[0012] Optionally, in the above multi-input LNA, the target value does not exceed 50 ohm.

[0013] Optionally, in the above multi-input LNA, the regulating circuit is used to increase the resonant frequency of the amplifying unit in the non-operating mode; wherein the resonant frequency increased by the regulating circuit is negatively correlated with the equivalent resistance of the AC path.

[0014] Optionally, in the above multi-input LNA, when the amplifying unit is in a non-operating mode, the equivalent resistance of the AC path is negatively correlated with the amplification factor of the amplifying unit.

[0015] Optionally, the regulating circuit may be a low-resistance network or a switch network.

[0016] In one implementation, the regulating circuit includes: a plurality of regulating transistors, the drains of the regulating transistors are all connected to the control terminals of the corresponding amplifying units, and the sources of the regulating transistors are all grounded.

[0017] Optionally, the gates of the respective regulating transistors may receive independent control signals, so that the conduction states of the respective regulating transistors may be independently controlled.

[0018] Alternatively, the gates of the regulating transistors may be connected to the same control signal, so that the regulating transistors may be controlled simultaneously based on the same control signal.

[0019] In another embodiment, the regulating circuit includes: a variable resistor, one end of the variable resistor is connected to the control end of the corresponding amplifying unit, and the other end of the variable resistor is grounded.

[0020] If the regulating circuit includes a variable resistor, further, the regulating circuit also includes a variable capacitor connected in parallel with the variable resistor.

[0021] A second aspect of the present application provides a radio frequency module, comprising any of the multi-input LNAs mentioned above.

[0022] A third aspect of the present application provides an electronic device, comprising the above-mentioned radio frequency module.

[0023] From the above description, it can be known that in the multi-input LNA, RF module and electronic device provided by the technical solution of the present application, the multi-input LNA includes multiple amplifying units, and the first pole of the amplifying unit realizes negative feedback grounding through the same inductor, which can simplify the port design of each amplifying unit at the first pole and reduce the cost; the second pole of the amplifying unit is connected to the output end of the multi-input LNA through a switch device, and the working state of the corresponding amplifying unit can be controlled by controlling the conduction state of the switch device; the control end of each amplifying unit is respectively used as an input end of the multi-input LNA to realize the multi-input end design of the LNA. The technical solution of the present application can also provide an AC path for the control end of the amplifying unit when the amplifying unit is in a non-working mode through a regulating circuit connected to the control end of the amplifying unit to adjust the resonant frequency of the amplifying unit, so that the resonant frequency of the amplifying unit in the non-working mode is far away from the working frequency band of the multi-input LNA, which can reduce the interference of the amplifying unit in the non-working mode to the amplifying unit in the working mode, thereby reducing the in-band noise of the multi-input LNA. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0025] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology. They are not used to limit the conditions under which this application can be implemented, and therefore have no substantive technical significance. Any structural modification, change in proportion or adjustment of size, without affecting the effects and purposes that can be achieved by this application, should still fall within the scope of the technical contents disclosed in this application.

[0026] Figure 1is a circuit diagram of a multi-input LNA;

[0027] Figure 2 A circuit diagram of a multi-input LNA provided in an embodiment of the present application;

[0028] Figure 3 A schematic diagram of a regulating circuit provided in an embodiment of the present application;

[0029] Figure 4 A schematic diagram of another regulating circuit provided in an embodiment of the present application;

[0030] Figure 5 A schematic diagram of another regulating circuit provided in an embodiment of the present application;

[0031] Figure 6 A schematic diagram of another regulating circuit provided in an embodiment of the present application;

[0032] Figure 7 A schematic diagram of another regulating circuit provided in an embodiment of the present application;

[0033] Figure 8 A performance test curve diagram of a multi-input LNA provided in an embodiment of the present application.

[0034] Reference numerals:

[0035] 1-amplification unit; 2-matching circuit; 3-regulation circuit; 4-regulation transistor; 5-variable resistor; 6-variable capacitor; K-switching device; L-inductor; OUT-output end. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the embodiments in the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0037] refer to Figure 1 , Figure 1 1 is a circuit diagram of a multi-input LNA, wherein the multi-input LNA comprises:

[0038] A plurality of interconnected amplifying units 1, each of which has a first pole, a second pole and a control terminal;

[0039] The first poles of the amplifying units 1 are all grounded through the same inductor L;

[0040] The second pole of the amplifying unit is connected to the output terminal OUT of the multi-input LNA through a switch device K; when the switch device K connected to the amplifying unit 1 is turned on, the amplifying unit 1 is in the working mode, and when the switch device K is turned off, the amplifying unit 1 is in the non-working mode;

[0041] The control end of each amplifying unit 1 serves as an input end of the multi-input LNA, and is connected to a matching circuit 2 .

[0042] exist Figure 1 In the multi-input LNA shown, when one input terminal is working, the amplifying units 1 connected to the other input terminals need to be turned off. The turned-off amplifying units 1 will interfere with the amplifying units 1 in working state, resulting in the multi-input LNA having larger in-band noise.

[0043] In order to solve the above problems, an embodiment of the present application provides a novel multi-input LNA. The technical solution of the present application can also provide an AC path for the control end of the amplifying unit through a regulating circuit connected to the control end of the amplifying unit when the amplifying unit is in a non-working mode, so as to adjust the resonant frequency of the amplifying unit, so that the resonant frequency of the amplifying unit in the non-working mode is far away from the working frequency band of the multi-input LNA, which can reduce the interference of the amplifying unit in the non-working mode to the amplifying unit in the working mode, thereby reducing the in-band noise of the multi-input LNA.

[0044] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0045] refer to Figure 2 , Figure 2 A circuit diagram of a multi-input LNA provided in an embodiment of the present application, wherein the multi-input LNA includes:

[0046] A plurality of interconnected amplifying units 1; the amplifying unit 1 comprises a first pole, a second pole and a control terminal;

[0047] The first poles of the amplifying units 1 are all grounded through the same inductor L;

[0048] The second pole of the amplifying unit 1 is connected to the output end of the multi-input LNA through a switch device K; when the switch device K connected to the amplifying unit 1 is turned on, the amplifying unit 1 is in the working mode, and when the switch device K is turned off, the amplifying unit 1 is in the non-working mode;

[0049] The control end of each amplification unit 1 serves as an input end of the multi-input LNA, and the control end is connected to a matching circuit 2;

[0050] Among them, at least one input end is connected to a regulating circuit 3; the regulating circuit 3 is used to provide an AC path for the control end of the amplifying unit 1 when the connected amplifying unit 1 is in a non-operating mode, so as to adjust the resonant frequency of the amplifying unit 1.

[0051] In the multi-input LNA provided in the embodiment of the present application, the first pole of the amplifying unit 1 is negatively feedback-grounded through the same inductor L, which can simplify the port design of each amplifying unit 1 at the first pole and reduce the cost.

[0052] Furthermore, the second pole of the amplifying unit 1 is connected to the output end of the multi-input LNA through a switch device K, and the working state of the corresponding amplifying unit 1 can be controlled by controlling the conduction state of the switch device K, so as to facilitate the switching control of the working mode of each amplifying unit 1. The control end of each amplifying unit 1 is respectively used as an input end of the multi-input LNA to realize the multi-input end design of the LNA.

[0053] The switch device K may be an electronic switch, specifically a switch transistor or a relay, etc. The embodiment of the present application does not limit the type of the switch device K. Based on the electronic switch, the working mode of each amplifying unit 1 can be automatically controlled by a switch signal.

[0054] The technical solution of the embodiment of the present application can also provide an AC path for the control end of the amplifying unit 1 when the amplifying unit 1 is in a non-operating mode through the regulating circuit 3 connected to the control end of the amplifying unit 1, so as to adjust the resonant frequency of the amplifying unit 1, so that the resonant frequency of the amplifying unit 1 in the non-operating mode is far away from the operating frequency band of the multi-input LNA, which can reduce the interference of the amplifying unit 1 in the non-operating mode to the amplifying unit 1 in the operating mode, thereby reducing the in-band noise of the multi-input LNA.

[0055] Optionally, the amplifying unit 1 can be a MOS device. The first pole is the source of the MOS device, the second pole is the drain of the MOS device, and the control end is the gate of the MOS device. At this time, the sources of all the amplifying units 1 are grounded through the same inductor L, and all the input ends adopt a circuit design of common source negative feedback to form a common source amplifier. Each amplifying unit 1 can input a signal RFIN from the gate and output a signal from the drain. MOS devices can provide voltage gain and have higher input impedance and lower output impedance. By adjusting the gate input signal RFIN, the gain and bandwidth of the common source amplifier can be changed to meet different application requirements.

[0056] Figure 1 and Figure 2In the figure, the leftmost amplifying unit 1 is in working mode and the other amplifying units are in non-working mode. Therefore, the switch device K connected to the leftmost amplifying unit 1 is in a closed state to form a path with the output terminal OUT, and the switch devices K connected to the other amplifying units 1 are in an open state to disconnect the circuit with the output terminal OUT.

[0057] Taking the amplification unit as a MOS device as an example, Figure 1 In the multi-input LNA shown, each input end of the LNA has a corresponding amplifier unit 1. When one of the input ends is working, the amplifier units 1 connected to the other input ends can be turned off by DC bias. Specifically, when the amplifier unit 1 is in the working mode, there is an amplification path between the source and drain of the corresponding MOS device and the output end OUT. When it is necessary to switch to the non-working mode, the switch device K is turned off, and the DC bias of the MOS device is realized by the input signal RFIN, so that the MOS device works in the linear region or the saturation region, so as to turn off the path between the source and the drain, and to have an input loop between the gate and the source (such as Figure 1 The curved arrows in the figure are used to illustrate the current path of the current path. Figure 1 In the multi-input LNA shown, due to the common source negative feedback circuit design of each MOS device, the shared inductor L will cause the gate-source input loop of the amplifier unit 1 in the non-operating mode to interfere with the input loop between the source and drain of the amplifier unit 1 in the operating mode, thereby causing the noise coefficient of the amplifier unit 1 in the operating mode to deteriorate.

[0058] At the same time, as the input signal RFIN of the input terminal in the non-operating mode is turned off, the scattering parameter (or S11 parameter) of the amplifying unit 1 in the operating mode will also be affected to a certain extent.

[0059] In order to solve the above problems, in the embodiments of the present application, Figure 2 As shown, the gate of the MOS device is connected with a regulating circuit 3 to avoid interference of the amplifier unit 1 in the non-operating mode with the amplifier unit 1 in the operating mode, which can reduce the adverse effect of the amplifier unit 1 in the non-operating mode on the noise coefficient of the amplifier unit 1 in the operating mode, and can reduce the adverse effect of the amplifier unit 1 in the non-operating mode on the S11 parameter of the amplifier unit 1 in the operating mode. Based on the existing circuit of the multi-input LNA, the regulating circuit 3 can be directly connected to the control end of the corresponding amplifier unit 1, without changing the existing circuit architecture of the multi-input LNA, and the circuit structure is simple.

[0060] As described above, in a multi-input LNA, the input loop between the gate and source of the amplifier unit 1 in the non-operating mode will interfere with the input loop between the source and drain of the amplifier unit 1 in the operating mode, resulting in a deterioration in the noise coefficient of the input loop of the amplifier unit 1 in the operating mode. Since each input terminal is connected to a matching circuit 2 for input matching design. Optionally, the matching circuit 2 includes an inductor, and the impedance matching of the input terminal can be optimized by connecting the inductor in series to the input terminal. Based on the matching circuit 2, when the input terminal is connected to a 50ohm terminal, the frequency resonance point of the input loop of the amplifier unit 1 in the non-operating mode is close to the operating frequency band at this time.

[0061] The technical solution of the embodiment of the present application sets up a regulating circuit 3 connected to the input end, which affects the noise impedance matching of the amplifying unit 1 in the working mode through the common source negative feedback inductor node shared by the amplifying unit 1. The resonant frequency of the connected amplifying unit 1 in the non-working mode can be adjusted, so that the resonant frequency deviates from the optimal noise matching impedance point designed by the matching circuit 2, thereby avoiding interference of the amplifying unit 1 in the non-working mode with the amplifying unit 1 in the working mode.

[0062] Optionally, the control end of each amplifying unit 1 is respectively connected to a regulating circuit 3. In this way, when any amplifying unit 1 is in working mode, other amplifying units 1 in non-working mode can adjust the resonant frequency of the input loop through the regulating circuit 3 connected to the corresponding input end, so as to avoid interference of the amplifying unit 1 in non-working mode with the amplifying unit 1 in working mode.

[0063] The regulating circuit 3 is used to provide an AC path with an equivalent resistance less than a target value for the control terminal of the amplifying unit 1 when the connected amplifying unit 1 is in a non-operating mode. In this way, when the amplifying unit 1 is in a non-operating mode, a low-impedance AC path can be provided for the control terminal of the connected amplifying unit 1 through the connected regulating circuit 3, so that the resonant frequency of the input loop of the amplifying unit 1 in the non-operating mode is far away from the operating frequency band of the multi-input LNA, thereby avoiding interference of the amplifying unit 1 in the non-operating mode with the amplifying unit 1 in the operating mode.

[0064] Optionally, the target value does not exceed 50 ohms. In this way, the regulating circuit 3 can provide an AC path with an equivalent resistance less than 50 ohms for the control end of the connected amplifying unit 1 when the connected amplifying unit 1 is in the non-working mode, which can better make the resonant frequency of the input loop of the amplifying unit 1 in the non-working mode away from the working frequency band of the multi-input LNA.

[0065] The regulating circuit 3 is used to increase the resonant frequency of the amplifying unit 1 in the non-working mode; wherein the resonant frequency increased by the regulating circuit 3 is negatively correlated with the equivalent resistance of the AC path. The smaller the equivalent resistance corresponding to the regulating circuit 3, the greater the increase in the resonant frequency of the connected amplifying unit 1 in the non-working mode; conversely, the greater the equivalent resistance corresponding to the regulating circuit 3, the smaller the increase in the resonant frequency of the connected amplifying unit 1 in the non-working mode. Based on this, the regulating circuit 3 can accurately control the resonant frequency of the connected amplifying unit 1 in the non-working mode by adjusting the circuit resistance, so as to effectively avoid the interference of the amplifying unit 1 in the non-working mode with the amplifying unit 1 in the working mode.

[0066] In the multi-input LNA provided in the embodiment of the present application, when the amplifier unit 1 is in the non-operating mode, the equivalent resistance of the AC path formed by the regulating circuit 3 is negatively correlated with the amplification factor of the amplifier unit 1. The greater the amplification factor of the amplifier unit 1, the greater the interference degree of the amplifier unit 1 in the non-operating mode to the amplifier unit 1 in the operating mode. In this embodiment, the equivalent resistance of the AC path is set to be negatively correlated with the amplification factor of the amplifier unit 1, so that the amplifier unit 1 with a larger amplification factor can provide an AC path with a smaller equivalent resistance through the regulating circuit 3 in the non-operating mode, which can increase the resonant frequency of the amplifier unit 1 to a greater extent, thereby better reducing the interference of the amplifier unit 1 in the non-operating mode to the amplifier unit 1 in the operating mode.

[0067] In the embodiment of the present application, the regulating circuit 3 is connected to the digital control circuit, and the enabling state of the regulating circuit can be controlled by the digital control circuit, so that the regulating circuit 3 can be enabled when the connected amplifying unit 1 is in a non-working mode, thereby increasing the resonant frequency of the amplifying unit in the non-working mode, and making the resonant frequency away from the working frequency band of the multi-input LNA.

[0068] For the amplifier unit 1 in the non-working mode, the connected regulating circuit 3 can provide a low-impedance AC path for the amplifier unit 1 to increase the resonant frequency of the amplifier unit 1, so that the resonant frequency of the amplifier unit 1 in the non-working mode is far away from the working frequency band of the multi-input LNA, which can reduce the interference of the amplifier unit 1 in the non-working mode to the amplifier unit 1 in the working mode. Among them, the regulating circuit 3 can adjust the equivalent impedance of the AC path to achieve the adjustment of the increase of the resonant frequency. Based on this, the regulating circuit 3 can be a low-impedance network or a switch network, etc., and the enabling control of the regulating circuit 3 can be achieved through a digital control circuit.

[0069] refer to Figure 3 , Figure 3 A schematic diagram of a regulating circuit provided in an embodiment of the present application, Figure 3The regulating circuit 3 shown includes: a plurality of regulating transistors 4, the drains d of the regulating transistors 4 are all connected to the control terminals of the corresponding amplifying units 1, and the sources s of the regulating transistors 4 are all grounded. Figure 3 In the manner shown, the regulating circuit 3 can regulate the resonance frequency of the connected amplifying unit 1 in the non-operating mode through a plurality of regulating transistors 4 connected in parallel.

[0070] In one implementation of the embodiment of the present application, the gates of the respective regulating transistors 4 can enter independent control signals respectively, so that the conduction states of the respective regulating transistors 4 can be independently controlled. In this implementation, when the amplifying unit 1 connected to the regulating circuit 3 is in a non-operating mode, the equivalent impedance of the AC path can be adjusted by controlling the number of the regulating transistors 4 that are turned on, so as to adapt to the amplifying units 1 with different amplification factors. For the amplifying units 1 with different amplification factors, the equivalent impedance of the AC path can be adapted to the amplification factor of the amplifying unit 1 by controlling the number of the regulating transistors 4 that are turned on, so as to better reduce the interference of the amplifying unit 1 in the non-operating mode to the amplifying unit 1 in the operating mode.

[0071] In another implementation of the embodiment of the present application, the gates of the respective regulating transistors 4 may be configured to use the same control signal. This implementation allows all regulating transistors 4 in the regulating circuit 3 to synchronously control the conduction state based on the same control signal, which facilitates the control of the regulating circuit 3. In this manner, each amplifying unit 1 in a non-operating mode may adjust the resonant frequency based on an AC path with the same equivalent resistance, and the regulating transistors 4 in all regulating circuits 3 may be controlled using the same control signal, which facilitates the unified control of the regulating circuit 3.

[0072] refer to Figure 4 , Figure 4 A schematic diagram of another regulating circuit provided in an embodiment of the present application, Figure 4 In the illustrated embodiment, the regulating circuit 3 includes: a variable resistor 5, one end of which is connected to the control end of the corresponding amplifying unit 1, and the other end of which is grounded. In this embodiment, the regulating circuit 3 can be constructed by the variable resistor 5, and when the connected amplifying unit 1 is in a non-operating mode, the equivalent resistance of the AC path can be adapted to the amplification factor of the amplifying unit 1 by simply adjusting the impedance of the variable resistor 5.

[0073] When the amplifier unit 1 connected to the variable resistor 5 is in a non-working mode, the resistance value of the variable resistor 5 can be set so that the equivalent resistance of the AC path is adapted to the amplification factor of the amplifier unit 1, providing a low-impedance AC path for the amplifier unit 1 to increase the resonant frequency of the amplifier unit 1 so that its resonant frequency is far away from the working frequency band of the multi-input LNA.

[0074] refer to Figure 5 , Figure 5 A schematic diagram of another regulating circuit provided in an embodiment of the present application is shown in FIG. Figure 4 On the basis of the method shown, a switch K' is connected to the branch where the variable resistor 5 is located, and the connection state between the branch where the variable resistor 5 is located and the control end of the amplifying unit 1 is controlled by the switch K'. When the amplifying unit 1 is in the non-operating mode, the switch is turned on, and when the amplifying unit 1 is in the operating mode, the switch K' is turned off. In this method, the switch K' and the switch device K connected to the same amplifying unit 1 are turned on or off synchronously to control the amplifying unit to be in the operating mode or the non-operating mode. For the convenience of control, the switch K' and the switch device K can be synchronously controlled by the same switch signal. .

[0075] exist Figure 5 In the illustrated embodiment, the switch K′ may be disposed between the variable resistor 5 and the control end of the connected amplifying unit 1 , or may be disposed in the circuit connected to the other end of the variable resistor 5 .

[0076] refer to Figure 6 , Figure 6 A schematic diagram of another regulating circuit provided in an embodiment of the present application, in Figure 4 Based on the method shown, Figure 6 The adjustment circuit shown also includes: a variable capacitor 6 connected in parallel with the variable resistor 5. In this way, the equivalent impedance of the AC path can be adjusted by adjusting the variable resistor 5 and the variable capacitor 6, so that the equivalent resistance of the AC path is adapted to the amplification factor of the amplification unit 1.

[0077] refer to Figure 7 , Figure 7 A schematic diagram of another regulating circuit provided in an embodiment of the present application is shown in FIG. Figure 6 On the basis of the method shown, by connecting a switch K' to the parallel branch of the variable resistor 5 and the variable capacitor 6, the connection state of the parallel branch and the control end of the amplifying unit 1 is controlled by the switch K'. When the amplifying unit 1 is in the non-operating mode, the switch K' is turned on, and when the amplifying unit 1 is in the operating mode, the switch K' is turned off. In this method, the switch K' and the switch device K connected to the same amplifying unit 1 are synchronously turned on or off to control the amplifying unit to be in the operating mode or the non-operating mode. For the convenience of control, the switch K' and the switch device K can be synchronously controlled by the same switch signal.

[0078] exist Figure 7 In the manner shown, the switch K' can be arranged between the parallel branch of the variable resistor 5 and the variable capacitor 6 and the control end of the connected amplifying unit 1, or can be arranged in the line connected to the other end of the parallel branch.

[0079] When the connected amplifier unit 1 is in non-operating mode, Figure 3-Figure 7 The regulation circuit 3 shown can reduce the interference of the connected amplification unit 1 to the amplification unit 1 in the working mode, and optimize the in-band noise of the multi-input LNA by about 50 mdB.

[0080] refer to Figure 8 , Figure 8 A performance test curve diagram of a multi-input LNA provided in an embodiment of the present application, Figure 8 The horizontal axis is the frequency in GHZ, and the vertical axis is the noise factor in dB. Figure 1 The test curve of the multi-input LNA without the adjustment circuit 3 is shown in FIG. Figure 2 The test curve of the multi-input LNA provided with the adjustment circuit 3 is shown. Based on the comparison between the test curves L1 and L2, it can be known that the in-band noise of the multi-input LNA can be reduced by the adjustment circuit 3.

[0081] It can be seen from the above description that the multi-input LNA provided in the embodiment of the present application can reduce the interference of the amplifying unit 1 in the non-working mode to the amplifying unit 1 in the working mode by connecting the adjustment circuit 3 at the input end, and can reduce the influence on the S11 parameter of the amplifying unit 1 in the working mode, so that the circuit design uncertainty is reduced, the noise coefficient of the multi-input LNA can be optimized, and the in-band noise can be reduced.

[0082] Based on any one of the implementation methods of the above embodiments, another embodiment of the present application further provides a radio frequency module, and the radio frequency module includes the multi-input LNA provided by any one of the implementation methods of the above embodiments.

[0083] The RF module provided in the embodiment of the present application adopts the multi-input LNA provided in any one of the implementation modes of the above-mentioned embodiments, and can reduce the interference of the amplifying unit 1 in the non-working mode to the amplifying unit 1 in the working mode through the adjustment circuit 3, and can optimize the noise coefficient of the multi-input LNA, and can improve the reliability and stability of the multi-input LNA, thereby improving the performance of the RF module.

[0084] Based on the above embodiments, another embodiment of the present application further provides an electronic device, which includes the above radio frequency module.

[0085] Optionally, the electronic device may be a wireless communication device such as a smart phone, a satellite communication device, a radar system, etc. The embodiment of the present application does not limit the type of the electronic device, and it may be any electronic device with a radio frequency module.

[0086] The electronic device provided in the embodiment of the present application adopts the above-mentioned RF module, and can reduce the interference of the amplifying unit 1 in the non-working mode to the amplifying unit 1 in the working mode through the adjustment circuit 3, optimize the noise coefficient of the multi-input LNA, improve the performance of the multi-input LNA, and thus improve the performance of the RF module and the electronic device.

[0087] In the specification of this application, each embodiment is described in a progressive, parallel, or progressive and parallel manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. The implementation methods provided in the embodiments of this application can be combined with each other if there is no contradiction.

[0088] It should be noted that in the description of the present application, it should be understood that the description of the drawings and embodiments is illustrative rather than restrictive. The same reference numerals throughout the embodiments of the specification identify the same structure. In addition, for the sake of understanding and ease of description, the drawings may exaggerate the thickness of some layers, films, panels, regions, etc. It is also understood that when an element such as a layer, film, region, or substrate is referred to as "on" another element, the element may be directly on the other element or there may be an intermediate element. In addition, "on" refers to positioning an element on or below another element, but does not essentially refer to positioning on the upper side of another element according to the direction of gravity.

[0089] The terms "upper", "lower", "top", "bottom", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. When a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centrally arranged component at the same time.

[0090] It should also be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that an article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such article or device. In the absence of further restrictions, the elements defined by the sentence "comprising a ..." do not exclude the existence of other identical elements in the article or device including the above elements.

[0091] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A multi-input LNA, characterized in that: include: A plurality of interconnected amplifying units; the amplifying units include a first pole, a second pole and a control terminal; The first electrodes of the amplifying units are all grounded through the same inductor; The second pole of the amplifying unit is connected to the output end of the multi-input LNA through a switch device; when the switch device connected to the amplifying unit is turned on, the amplifying unit is in a working mode, and when the switch device is turned off, the amplifying unit is in a non-working mode; The control end of each amplifying unit serves as an input end of the multi-input LNA, and each control end is connected to a matching circuit; Among them, at least one of the input terminals is connected to a regulating circuit; the regulating circuit is used to provide an AC path for the control terminal of the amplifying unit when the connected amplifying unit is in the non-working mode, so as to adjust the resonant frequency of the amplifying unit.

2. The multi-input LNA according to claim 1, characterized in that: The control ends of the amplifying units are respectively connected to one of the regulating circuits.

3. The multi-input LNA according to claim 1, characterized in that: The regulating circuit is used to provide an AC path with an equivalent resistance less than a target value for the control terminal of the amplifying unit when the connected amplifying unit is in a non-operating mode.

4. The multi-input LNA according to claim 3, characterized in that: The target value does not exceed 50 ohm.

5. The multi-input LNA according to claim 1, characterized in that: The regulating circuit is used to increase the resonant frequency of the amplifying unit in the non-operating mode; The resonant frequency increased by the regulating circuit is negatively correlated with the equivalent resistance of the AC path.

6. The multi-input LNA according to claim 1, characterized in that: When the amplifying unit is in the non-operating mode, the equivalent resistance of the AC path is negatively correlated with the amplification factor of the amplifying unit.

7. The multi-input LNA according to any one of claims 1 to 6, characterized in that: The regulating circuit comprises: A plurality of regulating transistors, wherein the drains of the regulating transistors are all connected to the control terminals of the corresponding amplifying units, and the sources of the regulating transistors are all grounded.

8. The multi-input LNA according to any one of claims 1 to 6, characterized in that: The regulating circuit comprises: a variable resistor, one end of which is connected to the control end of the corresponding amplifying unit, and the other end of which is grounded.

9. The multi-input LNA according to claim 8, characterized in that: The regulating circuit also includes a variable capacitor connected in parallel with the variable resistor.

10. A radio frequency module, characterized in that: Comprising a multi-input LNA as claimed in any one of claims 1-9.

11. An electronic device, characterized in that: Comprising the radio frequency module as described in claim 10.

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