Low noise amplifier circuit and radio frequency system

Abstract

The application relates to the technical field of electronic circuits, in particular to a low-noise amplification circuit and a radio frequency system. The low-noise amplification circuit at least comprises an amplification input circuit and an amplification output circuit; at least one set of tail inductance structures is arranged in the amplification input circuit and the amplification output circuit; a first resonant circuit is in a closed structure, the first resonant circuit is coupled to the tail inductance structures, and the first resonant circuit is used for discharging the current generated by the tail inductance structures; the first resonant circuit at least comprises a secondary coil which is coupled to a primary coil in the tail inductance structures; and a first capacitor module is electrically connected to the secondary coil at a first end. The application provides a low-noise amplification circuit with higher working stability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronic circuit, in particular, to a low noise amplification circuit and a radio frequency system. BACKGROUND

[0002] LNA (Low Noise Amplifier) is a commonly used circuit in radio frequency system, which is used for signal amplification while maintaining low noise of the system. Low noise, gain and linearity are the main part of the radio frequency system indicators, LNA plays a crucial role in maintaining the overall low noise of the radio frequency system, and the commonly used LNA circuit is a low noise amplifier with source degeneration inductance.

[0003] However, in actual work, the source degeneration inductance often produces parasitic oscillation with the parasitic capacitance in the circuit. The parasitic oscillation is relatively stable at low frequency, but it is very obvious at high frequency, which seriously affects the working stability of the circuit and causes abnormal LNA function.

[0004] Therefore, there is an urgent need for a low noise amplifier with higher stability. SUMMARY

[0005] In order to solve the above technical problems, the present application provides a low noise amplification circuit and a radio frequency system.

[0006] The first aspect of the present application provides a low noise amplification circuit, at least comprising:

[0007] An amplification input circuit and an amplification output circuit; wherein at least one set of tail inductance structure is included in the amplification input circuit and the amplification output circuit;

[0008] A first resonant circuit, the first resonant circuit is a closed structure, the first resonant circuit is coupled to the tail inductance structure, and the first resonant circuit is used for discharging the current generated by the tail inductance structure; the first resonant circuit at least includes:

[0009] A secondary coil, which is coupled to the primary coil in the tail inductance structure;

[0010] A first capacitor module, a first end of the first capacitor module is electrically connected to the secondary coil.

[0011] In an optional embodiment of the present application, the first resonant circuit further includes:

[0012] A first adjustable resistor, a first end of the first adjustable resistor is electrically connected with a first end of the secondary coil, and a second end of the first adjustable resistor is electrically connected with a second end of the first capacitor module; wherein the secondary coil, the first capacitor module and the first adjustable resistor are electrically connected with each other to form a closed structure.

[0013] In an optional embodiment of the present application, the amplification input circuit at least comprises:

[0014] An electrostatic protection circuit, an input end of the electrostatic protection circuit is used for receiving a to-be-amplified radio frequency signal, and the electrostatic protection circuit is grounded;

[0015] A second capacitor module, a first end of the second capacitor module is electrically connected with an output end of the electrostatic protection circuit, and a second end of the capacitor module is grounded;

[0016] A first electronic switch module, a control end of the first electronic switch module is electrically connected with the second capacitor module and a bias voltage, a source end of the first electronic switch module is electrically connected with the amplification output circuit, and a drain end of the first electronic switch module is electrically connected with a main-stage coil in the tail inductance structure.

[0017] In an optional embodiment of the present application, the first electronic switch module at least comprises:

[0018] A first electronic switch device, a gate of the first electronic switch device is electrically connected with the second capacitor module and a first bias voltage, and a drain of the first electronic switch device is electrically connected with the main-stage coil in the tail inductance structure;

[0019] A second electronic switch device, a gate of the second electronic switch device is used for connecting a second bias voltage, a source of the second electronic switch is electrically connected with the amplification output circuit, and a drain of the second electronic switch device is electrically connected with a source of the first electronic switch device.

[0020] In an optional embodiment of the present application, the amplification output circuit at least comprises:

[0021] A second electronic switch module, a gate of the second electronic switch module is used for receiving an enable signal, and a drain of the second electronic switch module is electrically connected with the second capacitor module;

[0022] A second resonant circuit, an input end of the second resonant circuit is electrically connected with a source of the second crystal module;

[0023] An output matching circuit, an input end of the output matching circuit is electrically connected with an output end of the second resonant circuit, and the output matching circuit is used for outputting a target radio frequency signal after frequency matching and gain adjustment on a signal output by the second resonant circuit.

[0024] In an optional embodiment of the present application, the output matching circuit at least comprises:

[0025] at least two groups of parallel capacitor devices, first ends of the capacitor devices being electrically connected to the output end of the second resonant circuit;

[0026] a first attenuation device, an input end of the first attenuation device being electrically connected to second ends of the capacitor devices, the first attenuation device and the capacitor devices performing frequency matching and gain adjustment on the signal output by the second resonant circuit to the target radio frequency signal;

[0027] an output module, an input end of the output module being electrically connected to an output end of the first attenuation device, the output module being configured to output the target radio frequency signal.

[0028] In an optional embodiment of the present application, the second resonant circuit at least comprises: a second adjustable resistance, a second adjustable capacitance and an inductance in parallel with each other.

[0029] In an optional embodiment of the present application, the low-noise amplification circuit further comprises:

[0030] a second attenuation device, an input end of the second attenuation device being electrically connected to the source of the second electronic switch module, an output end of the second attenuation device being electrically connected to the second resonant device.

[0031] In an optional embodiment of the present application, the amplification input circuit and the amplification output circuit are both multiple groups, corresponding to different radio frequency signals respectively.

[0032] In an optional embodiment of the present application, the tail inductance structure in the amplification input circuit at least comprises:

[0033] the main-stage coil;

[0034] a plurality of third electronic switch modules, gates of the third electronic switch modules being configured to receive a control signal, sources of the third electronic switch modules being electrically connected to the main-stage coil respectively, and drains of the third electronic switch modules being grounded.

[0035] In a second aspect of the embodiments of the present application, a radio frequency system is provided, at least comprising:

[0036] The low-noise amplification circuit according to any one of the preceding items.

[0037] The source degradation inductance often generates a parasitic oscillation phenomenon with the parasitic capacitance in the circuit, which is stable at low frequency but obvious at high frequency, seriously affecting the working stability of the circuit and leading to abnormal function of the low-noise amplification circuit. The low-noise amplification circuit provided in the embodiments of the present application is provided with a first resonance circuit, which is a closed structure grounded, and at least comprises a secondary coil and a first capacitor module. At low frequency, the first capacitor module is equivalent to an open circuit, and the first resonance circuit does not work, thereby maintaining the normal work of the low-noise amplification circuit at low frequency. At high frequency, the first capacitor module is equivalent to a closed circuit, forming an LC closed resonance circuit. Since the first resonance circuit is grounded, the frequency generated by the primary coil can be discharged to the ground at high frequency, thereby avoiding the parasitic oscillation phenomenon at high frequency, and further greatly improving the working stability of the low-noise amplification circuit. BRIEF DESCRIPTION OF DRAWINGS

[0038] The drawings described herein are used to provide further understanding of the present application, and form a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application, and do not constitute improper limitations on the present application. In the drawings:

[0039] Figure 1 A structure schematic diagram of the low-noise amplification circuit provided in the embodiments of the present application is shown in FIG. 1.

[0040] Figure 2 A structure schematic diagram of the low-noise amplification circuit provided in the embodiments of the present application is shown in FIG. 1.

[0041] Figure 3 A structure schematic diagram of the low-noise amplification circuit provided in the embodiments of the present application is shown in FIG. 1.

[0042] Figure 4 A structure schematic diagram of the low-noise amplification circuit provided in the embodiments of the present application is shown in FIG. 1.

[0043] Figure 5 A simulation result comparison diagram of the low-noise amplification circuit provided in the embodiments of the present application and the traditional low-noise amplification circuit is shown in FIG. 1.

[0044] Among them:

[0045] 10, a low-noise amplification circuit;

[0046] 100, an amplification input circuit; L1, a primary coil; M4, a third electronic switch module; 120, an electrostatic protection circuit; 130, a second capacitor module; 140, a first electronic switch module; M1, a first electronic switch device; M2, a second electronic switch device;

[0047] 200, amplification output circuit; M3, second electronic switch module; 220, second resonance circuit; R2, second adjustable resistor; C2, adjustable capacitor; L2, inductor; 230, output matching circuit; 231, capacitor device; Att1, first attenuation device; 233, output module; Att2, second attenuation device;

[0048] 300, first resonance circuit; L3, secondary coil; C1, first capacitor module; R1, first adjustable resistor. DETAILED DESCRIPTION

[0049] In the process of implementing the present application, the applicant finds that there is an urgent need for a low-noise amplifier with higher stability.

[0050] To solve the above problems, the present application provides a low-noise amplification circuit and a radio frequency system. In order to make the purpose, technical scheme and advantages of the present application more clear and explicit, the low-noise amplification circuit and the radio frequency system of the present application are further described in the following embodiments and in conjunction with the drawings. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application.

[0051] The serial numbers of components in this paper, such as "first", "second", etc., are only used to distinguish the described objects, and have no technical meaning. Unless otherwise specified, "connection" and "coupling" in the present application include direct and indirect connection (coupling). In the description of the present application, it should be understood that the orientation or position relationship indicated by the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0052] In the present application, unless otherwise specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0053] Please refer to Figure 1 and Figure 2The embodiment of the application provides a low-noise amplification circuit 10, at least comprising: an amplification input circuit 100, an amplification output circuit 200 and a first resonant circuit 300, wherein:

[0054] Please refer to Figure 2 The amplification input circuit 100 and the amplification output circuit 200; at least one set of tail inductance structures is arranged in the amplification input circuit 100 and the amplification output circuit 200; the amplification input circuit 100 is a circuit for receiving, preliminarily amplifying and processing a signal RFin to be amplified, the amplification output circuit 200 is a circuit for secondarily amplifying and processing the signal RFin to be amplified, and the embodiment of the application limits the specific form of the amplification input circuit 100 and the amplification output circuit 200, which only needs to have the function of low-noise amplification of the signal RFin to be amplified. The tail inductance structure can be composed of one or more inductors, the tail inductance structure can be grounded, and the tail inductance structure and the first resonant circuit 300 jointly form a source degeneration inductance network with obvious frequency characteristics. The source degeneration inductance network can keep a high Q value (the Q value of an inductor L2, also referred to as the quality factor of the inductor L2, is a main parameter for measuring an inductor. The Q value of the inductor refers to the ratio of the inductive reactance to the equivalent loss resistance of the inductor when the inductor works under an alternating voltage at a certain frequency. The higher the Q value of the inductor, the smaller the loss and the higher the efficiency) in a working frequency range. The Q value rapidly decreases at high frequencies, thereby greatly improving the high-frequency stability of the low-noise amplification circuit 10.

[0055] Please refer to Figure 2 The first resonant circuit 300 is in a closed structure, the first resonant circuit 300 is coupled to the tail inductance structure, and the first resonant circuit 300 is used for discharging a current generated by the tail inductance structure; the first resonant circuit 300 at least comprises a secondary coil L3 and a first capacitor module C1, wherein: the secondary coil L3 is coupled to a primary coil L1 in the tail inductance structure; the secondary coil L3 and the primary coil L1 form a coupled inductor L2 pair and oscillate with each other. A first end of the first capacitor module C1 is electrically connected to the secondary coil L3. In an optional embodiment, a second end of the first capacitor module C1 is grounded, so as to discharge the current generated by the tail inductance structure. The first capacitor module C1 can be composed of one or more series capacitors, and the capacitor has the characteristics of passing high frequencies and blocking low frequencies. That is, in the case of low frequencies, the first capacitor module C1 is equivalent to an open circuit, and the first resonant circuit 300 does not work; in the case of high frequencies, the first capacitor module C1 is equivalent to a closed circuit, and forms an LC closed resonant circuit. Since the first resonant circuit 300 is grounded, the frequency generated by the primary coil L1 can be discharged to the ground in the case of high frequencies, and does not work in the case of low frequencies.

[0056] In the low noise amplifier 10, the source degeneration inductance often forms a three-point oscillator with the parasitic capacitance in the circuit, thereby generating a parasitic oscillation phenomenon, which is not obvious at low frequencies, but at high frequencies, the parasitic capacitance and the parasitic inductance of the circuit begin to work, and the oscillation phenomenon often occurs, which seriously affects the working stability of the circuit and causes the low noise amplifier circuit 10 to malfunction. The low noise amplifier circuit 10 provided by the embodiment of the present application is provided with a first resonant circuit 300, the first resonant circuit 300 is a closed structure, and the first resonant circuit 300 at least includes a secondary coil L3 and a first capacitor module C1. In the case of low frequency, the first capacitor module C1 is equivalent to an open circuit, and the first resonant circuit 300 does not work, thereby maintaining the normal operation of the low noise amplifier circuit 10 at low frequency. In the case of high frequency, the first capacitor module C1 is equivalent to a closed circuit, forming an RLC closed resonant circuit, and the resistance R1 is used to adjust the Q value of the resonant circuit, thereby reducing the Q value of the resonant circuit. The resonant circuit composed of L3, C12 and R1 reduces the inductance value and the Q value of the primary coil L1 through mutual inductance, so that the primary coil L1 presents the characteristics of small inductance and low Q value at high frequency, so that the circuit does not meet the oscillation condition, thereby avoiding the parasitic oscillation phenomenon at high frequency, and further greatly improving the working stability of the low noise amplifier circuit 10.

[0057] Please continue to see Figure 2 and Figure 3 In an optional embodiment of the present application, the first resonant circuit 300 further comprises a first adjustable resistance R1, wherein:

[0058] The first end of the first adjustable resistance R1 is electrically connected to the first end of the secondary coil L3, and the second end of the first adjustable resistance R1 is electrically connected to the second end of the first capacitor module C1. The secondary coil L3, the first capacitor module C1 and the first adjustable resistance R1 are electrically connected to each other to form a closed structure. The first adjustable resistance R1 is used to adjust the Q value of the secondary coil L3. The greater the resistance value of the first adjustable resistance R1, the lower the Q value of the secondary coil L3. The performance of the first resonant circuit 300 can be adjusted by the first adjustable resistance R1 to meet the requirements of different scenes and improve the adaptability of the low noise amplifier circuit 10 of the embodiment of the present application.

[0059] Please see Figure 2 and Figure 3 In an optional embodiment of the present application, the amplification input circuit 100 at least comprises an electrostatic protection circuit 120, a second capacitor module 130 and a first electronic switch module 140, wherein:

[0060] The input end of the electrostatic protection circuit 120 is used to receive the radio frequency signal to be amplified, and the electrostatic protection circuit 120 is grounded. The electrostatic protection circuit 120 can be seen in Figure 3The two anti-parallel grounding diodes prevent the electronic components or devices from being damaged under the action of electrostatic field, and further improve the working stability and safety of the overall circuit.

[0061] The first end of the second capacitor module 130 is electrically connected with the output end of the electrostatic protection circuit 120, and the second end of the capacitor module is grounded; the second capacitor module 130 can be seen from Figure 3 The two T-shaped connected capacitors prevent the electronic components or devices from being damaged under the action of electrostatic field, and further improve the working stability and safety of the overall circuit.

[0062] The control end of the first electronic switch module 140 is electrically connected with the second capacitor module 130 and the bias voltage, the source end of the first electronic switch module 140 is electrically connected with the amplification output circuit 200, and the drain end of the first electronic switch module 140 is electrically connected with the main-stage coil L1 in the tail inductance structure. The first electronic switch module 140 is an LNA main-body amplification electronic switch, the signal is input from the gate of the second electronic switch device M2 and output from the drain of the first electronic switch device M1, and the first electronic switch device M1 in the first electronic switch module 140 is an unnecessary device.

[0063] Please continue to refer to Figure 2 and Figure 3 In an optional embodiment of the present application, the first electronic switch module 140 at least includes: a first electronic switch device M1 and a second electronic switch device M2, wherein:

[0064] The gate of the first electronic switch device M1 is electrically connected with the second capacitor module 130 and the first bias voltage Vb1, and the drain of the first electronic switch device M1 is electrically connected with the main-stage coil L1 in the tail inductor structure; the gate of the second electronic switch device M2 is used for connecting the second bias voltage Vb2, the source of the second electronic switch is electrically connected with the amplification output circuit 200, and the drain of the second electronic switch device M2 is electrically connected with the source of the first electronic switch device M1. The first electronic switch device M1 and the second electronic switch device M2 constitute an amplification main circuit of the low-noise amplification circuit 10, and perform one-stage amplification on the signal to be amplified RFin. The first electronic switch device M1 and the second electronic switch device M2 can be N-type electronic switches, and in the present embodiment, the first electronic switch device M1 and the second electronic switch device M2 can also be P-type electronic switches, as long as the above functions are realized, and the type of the first electronic switch device M1 and the second electronic switch device M2 is not limited in the present embodiment.

[0065] Please continue to see Figure 2 and Figure 3 In an optional embodiment of the present application, the amplification output circuit 200 at least includes: a second electronic switch module M3, a second resonant circuit 220 and an output matching circuit 230, wherein:

[0066] Please see Figure 3 and Figure 4 The gate of the second electronic switch module M3 is used for receiving an enable signal Att_en, for controlling the turn-on and turn-off of the second electronic switch, and the drain of the second electronic switch module M3 is electrically connected with the second capacitor module 130. The second electronic switch module M3 can be composed of one or more electronic switches in series, and the second electronic switch module M3 can be an N-type electronic switch. The second electronic switch module M3, the second resonant circuit 220 and the output matching circuit 230 together realize the amplification output function of the signal.

[0067] Please see Figure 2 and Figure 3 The input end of the second resonant circuit 220 is electrically connected with the source of the second crystal module, the second resonant circuit 220 is used for providing load impedance, frequency selection characteristics, adjusting capacitance according to working frequency, adjusting inductance value, and adjusting resistance for adjusting gain. In an optional embodiment of the present application, the second resonant circuit 220 at least includes: a second adjustable resistance R2, an adjustable capacitance C2 and an inductance L2 in parallel with each other, and the two ends of the second adjustable resistance R2, the adjustable capacitance C2 and the inductance L2 are respectively used for receiving a control signal and connecting to the connection point of the second electronic switch module M3 and the output matching circuit 230.

[0068] Please seeFigure 2 An input end of the output matching circuit 230 is electrically connected with an output end of the second resonant circuit 220, and the output matching circuit 230 is configured to output a target radio frequency signal after frequency matching and gain adjustment of a signal output by the second resonant circuit 220. Please continue to refer to Figure 3 In an optional embodiment of the present application, the output matching circuit 230 at least includes: at least two groups of parallel capacitor devices 231, a first attenuation device Att1, and an output module 233, wherein:

[0069] A first end of the capacitor device 231 is electrically connected with the output end of the second resonant circuit 220; wherein the capacitor device 231 is configured to output frequency matching while isolating a direct current level, and the capacitor device 231 can be a fixed capacitor or an adjustable capacitor, and the working frequency band can be adjusted by adjusting the capacitor.

[0070] An input end of the first attenuation device Att1 is electrically connected with a second end of the capacitor device 231, and the first attenuation device Att1 and the capacitor device 231 perform frequency matching and gain adjustment of a signal output by the second resonant circuit 220 to the target radio frequency signal.

[0071] An input end of the output module 233 is electrically connected with an output end of the first attenuation device Att1, and the output module 233 is configured to output the target radio frequency signal.

[0072] The amplification output circuit 200 in the embodiment of the present application at least includes: a second electronic switch module M3, a second resonant circuit 220, and an output matching circuit 230, and through mutual cooperation of the second electronic switch module M3, the second resonant circuit 220, and the output matching circuit 230, a more stable and reliable target radio frequency signal can be output, and the working stability and reliability of the low noise amplification circuit 10 in the embodiment of the present application are further improved.

[0073] Please continue to refer to Figure 3 In an optional embodiment of the present application, the low noise amplification circuit 10 further includes: a second attenuation device Att2, wherein:

[0074] An input end of the second attenuation device Att2 is electrically connected with a source electrode of the second electronic switch module M3, and an output end of the second attenuation device Att2 is electrically connected with the second resonant device, and the second attenuation device Att2 has the same function as the first attenuation device Att1, and is configured to perform negative feedback at certain gain positions, realize different gain positions, meet different gain requirements, weaken the nonlinear influence of the overall circuit, improve the linearity of the circuit, and further improve the working stability and reliability of the low noise amplification circuit 10, and meanwhile, input impedance matching can also be realized.

[0075] Please continue to see Figure 3 In an optional embodiment of the present application, the amplification input circuit 100 and the amplification output circuit 200 are multiple groups, which correspond to different radio frequency signals respectively, so as to meet different amplification requirements, thereby improving the application scope and working efficiency of the low noise amplification circuit 10 provided by the embodiment of the present application.

[0076] Please see Figure 4 In an optional embodiment of the present application, the tail inductance structure in the amplification input circuit 100 at least includes the main stage coil L1 and a plurality of third electronic switch modules M4, wherein:

[0077] The gate of the third electronic switch module M4 is used for receiving a control signal, the source of the third electronic switch module M4 is electrically connected with the main stage coil L1 respectively, and the third electronic switch is a switch tube, which realizes the switching function of the main stage inductance, and can also improve the ESD protection capability of the input tube M2.

[0078] The traditional winding mode of the main stage coil has no secondary coil. If the secondary coil is to be arranged on the layout, an additional layout area needs to be increased, resulting in a too large device. In an optional embodiment of the present application, since the Q value requirement of the secondary coil L3 is not high, the secondary coil L3 can be arranged below the main stage inductance L2 by winding, without increasing an additional area, thereby improving the surface area utilization rate of the device.

[0079] Please see Figure 5 For the simulation result comparison chart of the low frequency amplification circuit 10 provided by the embodiment of the present application and the traditional low frequency amplification circuit, the inductance value of the traditional inductance is relatively consistent in the entire frequency band, and the Q value gradually increases with the increase of the frequency and then decreases after a certain frequency. In the low noise amplifier using the traditional inductance, since the inductance characteristic is strong at high frequency and the Q value is also high, the stability of the low noise amplifier at high frequency is poor, and it is easy to self-oscillate. The inductance and Q value of the inductance structure of the present application in the working frequency band are similar to those of the traditional inductance, but the inductance rapidly decreases to close to 0 and the Q value also rapidly decreases at higher frequencies than the working frequency band. The inductance characteristic at high frequency is weak, which realizes the normal working of the low noise amplifier in the working frequency band and the high stability characteristic of the low noise amplifier at higher frequencies than the working frequency band.

[0080] In order to prevent the interference of external static electricity on the signal in the low-noise amplification circuit, the low-noise amplification circuit further comprises a multi-stage impedance protection module in an optional embodiment of the present application, at least one detection control module is arranged between adjacent two stages of the impedance protection module, an input end of the first-stage impedance protection module in the multi-stage impedance protection module is electrically connected with the static electricity source, and the last-stage impedance protection module in the multi-stage impedance protection module is respectively electrically connected with the static electricity source and the amplification input circuit or the amplification output circuit.

[0081] The detection control module is used for detecting the output voltage of the front-stage impedance protection module, and the back-stage impedance protection module is started when the output voltage is greater than a preset voltage, and discharges the static electricity voltage of the static electricity source; wherein the front-stage impedance protection module refers to the impedance protection module which is electrically connected with the detection control module and located in the front stage of the detection control module, and the back-stage impedance protection module refers to the impedance protection module which is electrically connected with the detection control module and located in the back stage of the detection control module. The front-stage impedance protection module comprises a plurality of series-connected diode devices.

[0082] In an optional embodiment of the present application, the front-stage impedance protection module comprises a first diode module and a second diode module which are connected in parallel with each other, input ends of the first diode module and the second diode module are respectively electrically connected with the static electricity source, and output ends of the first diode module and the second diode module are respectively grounded; wherein the first diode module and the second diode module respectively comprise at least two series-connected diode devices, and the diode devices in the first diode module and the diode devices in the second diode module are connected in opposite directions.

[0083] In an optional embodiment of the present application, the back-stage impedance protection module comprises at least a transistor device, a control end of the transistor device is electrically connected with the detection control module, a first connection end of the transistor device is electrically connected with the connection point of the front-stage impedance protection module and the static electricity source, a second connection end of the transistor device is grounded, and the transistor device is started when the working voltage of the front-stage impedance protection module is greater than a preset voltage, and discharges the static electricity voltage of the static electricity source.

[0084] In an optional embodiment of the present application, the transistor device is an N-type transistor.

[0085] In an optional embodiment of the present application, the detection control module comprises at least:

[0086] a first resistor device, a first end of the first resistor device is electrically connected with the front-stage impedance protection module;

[0087] A second resistor device, a first end of the second resistor device is electrically connected with a second end of the first resistor device and a control end of the later-stage impedance protection module respectively, and a second end of the second resistor device is grounded.

[0088] In an optional embodiment of the present application, a current limiting device is further included, an input end of the current limiting device is electrically connected with the connection point of the former-stage impedance protection module and the static source, and an output end of the current limiting device is electrically connected with a first connection end of the later-stage impedance protection module.

[0089] In an optional embodiment of the present application, the current limiting device includes a plurality of capacitors connected in series.

[0090] In an optional embodiment of the present application, the multi-stage impedance protection module is a two-stage impedance protection module.

[0091] In an optional embodiment of the present application, the power supply of the low-noise amplification circuit can be a dual power supply system, for example, including an analog power supply and a digital power supply, and in an optional embodiment of the present application, a power-on detection is provided for the low-noise amplification circuit, and the low-noise amplification circuit further includes:

[0092] a level shifting unit, an input end of the level shifting unit is electrically connected with the digital power supply, and the level shifting unit is used to pull up the digital power supply to a comparison voltage in a preset voltage range;

[0093] a level comparison output unit, input ends of the level comparison output unit are electrically connected with the analog power supply and the input end of the level shifting unit respectively, the level comparison output unit is used to output a first control signal in a case that the comparison voltage is greater than an analog voltage of the analog power supply, and output a second control signal in a case that the comparison voltage is not greater than the analog voltage; wherein the first control signal controls the analog circuit not to work, and the second control signal controls the analog circuit to work.

[0094] In an optional embodiment of the present application, the level shifting unit at least includes a level shifting module, an output end of the level shifting module is electrically connected with the input end of the level comparison output unit.

[0095] a first transistor device, a gate of the first transistor device is electrically connected with the digital power supply, a source of the first transistor device is electrically connected with the input end of the level shifting module, and a drain of the first transistor is grounded.

[0096] In an optional embodiment of the present application, the level comparison output unit includes:

[0097] a level comparison module, input ends of the level comparison module are electrically connected with the analog power supply and an output end of the level shift module respectively;

[0098] a comparison output module, a control end of the comparison output module is electrically connected with a gate of the first transistor device, input ends of the comparison output module are electrically connected with output ends of the level comparison module, a first output end of the comparison output module is grounded, and a second output end of the comparison output module is used for outputting the first control signal or the second control signal.

[0099] In an optional embodiment of the present application, the level comparison module at least includes:

[0100] a second transistor device, a gate and a drain of the second transistor device are electrically connected with input ends of the level shift module, and a source of the second transistor device is electrically connected with the analog power supply;

[0101] a third transistor device, a gate of the third transistor device is electrically connected with a gate of the second transistor device, a source of the third transistor device is electrically connected with the analog power supply, and a drain of the third transistor device is electrically connected with input ends of the comparison output module.

[0102] In an optional embodiment of the present application, the comparison output module at least includes:

[0103] a fourth transistor device, a gate of the fourth transistor device is electrically connected with the digital power supply, and a source of the fourth transistor device is electrically connected with a drain of the third transistor device;

[0104] a fifth transistor device, a gate of the fifth transistor device is electrically connected with the digital power supply, a source of the fifth transistor device is electrically connected with a drain of the fourth transistor device, and a drain of the fifth transistor device is grounded.

[0105] In an optional embodiment of the present application, the first transistor device, the second transistor device, the third transistor device and the fourth transistor device are all transistor devices of a first conduction type; the fifth transistor device is a transistor device of a second conduction type; and the first conduction type and the second conduction type are different.

[0106] In an optional embodiment of the present application, the first transistor device, the second transistor device, the third transistor device and the fourth transistor device are all P-type transistor devices; and the fifth transistor device is an N-type transistor device.

[0107] In an optional embodiment of the present application, the level shifting module comprises a plurality of transistors, each of which is formed by a number of diode connections.

[0108] In an optional embodiment of the present application, the number of the transistors is positively correlated with the absolute value of the voltage difference between the digital power supply and the analog power supply.

[0109] An embodiment of the present application provides a radio frequency system, comprising at least:

[0110] The low noise amplification circuit 10 according to any one of the above.

[0111] The beneficial effects of the low noise amplification circuit 10 have been described in detail in the above embodiments, and will not be repeated here.

[0112] Based on the low noise amplification circuit 10 described above, an embodiment of the present application provides a radio frequency system which can weaken the high-frequency parasitic oscillation phenomenon and has higher stability and reliability.

[0113] It should be understood that, although each step in the flowchart is shown in sequence according to the direction of the arrow, these steps are not necessarily executed in sequence according to the direction of the arrow. Unless otherwise specified herein, the execution of these steps is not strictly limited in sequence, and these steps can be executed in other sequences. Moreover, at least part of the steps in the figure can include multiple sub-steps or multiple stages, which are not necessarily executed at the same time, but can be executed at different times, and the execution sequence of these sub-steps or stages is not necessarily sequential, but can be executed in rotation or alternation with other steps or sub-steps or stages of other steps.

[0114] The technical features of the above embodiments can be combined in any manner. To make the description concise, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the present application.

[0115] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the patent scope of the application. It should be pointed out that, for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A low noise amplifier circuit, characterized by, At least comprising: amplification input circuit and amplification output circuit; wherein at least one set of tail inductance structure in the amplification input circuit and the amplification output circuit; wherein the amplification output circuit at least includes: The gate of the second electronic switch module is used for receiving an enable signal, and the drain of the second electronic switch module is electrically connected with the second capacitor module in the amplification input circuit; wherein the first end of the second capacitor module is electrically connected with the output end of the electrostatic protection circuit, and the second end of the second capacitor module is grounded; The input end of the second resonant circuit is electrically connected with the source of the second electronic switch module; The input end of the output matching circuit is electrically connected with the output end of the second resonant circuit, and the output matching circuit is used for frequency matching and gain adjustment of the signal output by the second resonant circuit and then outputting a target radio frequency signal; wherein the output matching circuit at least includes: at least two sets of parallel capacitor devices, the first end of the capacitor device is electrically connected with the output end of the second resonant circuit; the first attenuation device, the input end of the first attenuation device is electrically connected with the second end of the capacitor device, and the first attenuation device and the capacitor device frequency match and gain adjust the signal output by the second resonant circuit to the target radio frequency signal; the input end of the output module is electrically connected with the output end of the first attenuation device, and the output module is used for outputting the target radio frequency signal; The first resonant circuit is a closed structure, the first resonant circuit is coupled with the tail inductance structure, and the first resonant circuit is used for discharging the current generated by the tail inductance structure; the first resonant circuit at least includes: The secondary coil is coupled with the primary coil in the tail inductance structure; The first end of the first capacitor module is electrically connected with the secondary coil; The first end of the first adjustable resistor is electrically connected with the first end of the secondary coil, and the second end of the first adjustable resistor is electrically connected with the second end of the first capacitor module; wherein the secondary coil, the first capacitor module and the first adjustable resistor are electrically connected to form a closed structure.

2. The low noise amplification circuit of claim 1, wherein, The amplification input circuit further includes: The input end of the electrostatic protection circuit is used for receiving the radio frequency signal to be amplified, and the electrostatic protection circuit is grounded; The control end of the first electronic switch module is electrically connected with the second capacitor module and the bias voltage, the source end of the first electronic switch module is electrically connected with the amplification output circuit, and the drain end of the first electronic switch module is electrically connected with the primary coil in the tail inductance structure.

3. The low noise amplification circuit of claim 2, wherein, The first electronic switch module at least includes: The gate of the first electronic switch device is electrically connected with the second capacitor module and the first bias voltage, and the drain of the first electronic switch device is electrically connected with the primary coil in the tail inductance structure; A second electronic switch device, a gate of the second electronic switch device is used for connecting a second bias voltage, a source of the second electronic switch is electrically connected with the amplification output circuit, and a drain of the second electronic switch device is electrically connected with a source of the first electronic switch device.

4. The low noise amplification circuit of claim 3, wherein, The second resonance circuit at least comprises a second adjustable resistor, an adjustable capacitor and an inductor which are connected in parallel with each other.

5. The low noise amplification circuit of claim 2, wherein, Further comprising: A second attenuation device, an input end of the second attenuation device is electrically connected with a source of the second electronic switch module, and an output end of the second attenuation device is electrically connected with the second resonance device.

6. The low noise amplification circuit of claim 1, wherein, The amplification input circuit and the amplification output circuit are both multiple groups, and correspond to different radio frequency signals respectively.

7. The low noise amplification circuit of claim 1, wherein, The tail inductance structure in the amplification input circuit at least comprises: The main stage coil; A plurality of third electronic switch modules, a gate of the third electronic switch module is used for receiving a control signal, a source of the third electronic switch module is electrically connected with the main stage coil respectively, and a drain of the third electronic switch is grounded.

8. A radio frequency system, characterized by At least comprising: The low noise amplification circuit according to any one of claims 1-7.

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