Low noise amplifier and wireless transceiver system

Abstract

The invention discloses a low noise amplifier and a wireless transceiver system. The low-noise amplifier comprises an input matching network, a first-stage amplification network, an inter-stage matching network, a second-stage amplification network and an output matching network. The input end of the input matching network inputs a single-ended signal, and the output end is connected with the first end of the first-stage amplification network; the third end of the first-stage amplification network is connected with the first end of the inter-stage matching network, and the fourth end is grounded; the second end of the inter-stage matching network is connected with the first end of the second-stage amplification network, the third end of the inter-stage matching network is connected with the second end of the second-stage amplification network, and the fourth end of the inter-stage matching network is connected with the third end of the second-stage amplification network; the first end of the output matching network is connected with the fourth end of the second-stage amplification network, the second end is connected with the fifth end of the second-stage amplification network, and the third end and the fourth end output differential signals. According to the technical scheme provided by the embodiment of the invention, the conversion of the radio-frequency signal from a single end to a differential end can be realized, and the low-noise performance is realized on the premise of low power consumption.

Description

Technical Field

[0001] The present invention relates to the technical field of amplifiers, and in particular to a low noise amplifier and a wireless transceiver system. Background Art

[0002] The low noise amplifier is one of the core modules in the wireless transceiver system. It also plays a very important role in the integrated circuit and the entire communication field. Its main function is to amplify the RF signal received by the antenna. As the frontmost circuit in the receiving link, the noise coefficient performance of the low noise amplifier has the greatest impact on the noise coefficient performance of the system.

[0003] Typically, in large-scale silicon-based RF chips, since silicon-based processes usually do not have through-silicon vias, the area inside the chip that is far away from the edge ground pad does not have a good ground connection when the passing signal is a single-ended signal; at the same time, since the low-noise amplifier in the receiving link needs to work for a long time, the power consumption is relatively high. Summary of the invention

[0004] The present invention provides a low noise amplifier and a wireless transceiver system to realize the conversion of radio frequency signals from single-ended to differential, and to achieve low noise performance under the premise of low power consumption.

[0005] According to one aspect of the present invention, there is provided a low noise amplifier, comprising an input matching network, a first stage amplification network, an inter-stage matching network, a second stage amplification network and an output matching network;

[0006] The input end of the input matching network inputs a single-ended signal, the first end of the input matching network is connected to a first power supply, and the output end of the input matching network is connected to the first end of the first-stage amplification network; the input matching network is used for input impedance matching of the low-noise amplifier;

[0007] The second end of the first-stage amplifying network is connected to the second power supply, the third end of the first-stage amplifying network is connected to the first end of the inter-stage matching network, and the fourth end of the first-stage amplifying network is grounded;

[0008] The second end of the interstage matching network is connected to the first end of the second-stage amplifying network, the second end of the interstage matching network is also grounded, the third end of the interstage matching network is connected to the second end of the second-stage amplifying network, the fourth end of the interstage matching network is connected to the third end of the second-stage amplifying network, and the fifth end of the interstage matching network is connected to a third power supply; the interstage matching network is used to convert the single-ended signal output by the first-stage amplifying network into a differential signal;

[0009] The first end of the output matching network is connected to the fourth end of the second-stage amplification network, the second end of the output matching network is connected to the fifth end of the second-stage amplification network, the third end of the output matching network and the fourth end of the output matching network output the differential signal, and the fifth end of the output matching network is connected to a fourth power supply; the output matching network is used for output impedance matching of the low-noise amplifier.

[0010] Optionally, the input matching network includes a first capacitor, a first inductor and a first resistor;

[0011] The single-ended signal is input to the first end of the first capacitor, the second end of the first capacitor is connected to the first end of the first inductor, the second end of the first inductor is connected to the first end of the first resistor and the first end of the first-stage amplifier network, and the second end of the first resistor is connected to the first power supply;

[0012] The first resistor is used to isolate the single-ended signal from a power signal of the first power supply.

[0013] Optionally, the first-stage amplification network includes a first transistor, a second transistor, a second resistor, a second capacitor, and a second inductor;

[0014] The control electrode of the first transistor is connected to the output end of the input matching network, the first electrode of the first transistor is connected to the first end of the second inductor, the second electrode of the first transistor is connected to the first electrode of the second transistor, the second electrode of the second transistor is connected to the first end of the inter-stage matching network, the control electrode of the second transistor is connected to the first end of the second resistor and the first end of the second capacitor, the second end of the second resistor is connected to the second power supply, and the second end of the second capacitor and the second end of the second inductor are grounded.

[0015] Optionally, the inter-stage matching network includes a first balun;

[0016] The first balun includes a first primary coil and a first secondary coil;

[0017] The first end of the first primary coil is connected to the third end of the first-stage amplification network, the second end of the first primary coil is connected to the first end of the second-stage amplification network, the second end of the first primary coil is also grounded, the first end of the first secondary coil is connected to the second end of the second-stage amplification network, the second end of the first secondary coil is connected to the third end of the second-stage amplification network, and the middle tap of the first secondary coil is connected to the third power supply.

[0018] Optionally, the output matching network includes a second balun and a third capacitor;

[0019] The second balun includes a second primary coil and a second secondary coil;

[0020] The first end of the second primary coil is connected to the fourth end of the second-stage amplification network, the second end of the second primary coil is connected to the fifth end of the second-stage amplification network, the first end of the second secondary coil is connected to the first end of the third capacitor, the second end of the second secondary coil is connected to the second end of the third capacitor, the first end of the third capacitor and the second end of the third capacitor output the differential signal, and the middle tap of the second primary coil is connected to the fourth power supply.

[0021] Optionally, the second stage amplification network includes a third transistor and a fourth transistor;

[0022] The control electrode of the third transistor is connected to the fourth end of the inter-stage matching network, the first electrode of the third transistor is connected to the first electrode of the fourth transistor and the second end of the inter-stage matching network, the second electrode of the third transistor is connected to the second end of the output matching network, and the second electrode of the fourth transistor is connected to the first end of the output matching network.

[0023] Optionally, the low noise amplifier further includes a first neutralization capacitor and a second neutralization capacitor;

[0024] The first end of the first neutralization capacitor is connected to the first end of the output matching network and the second electrode of the fourth transistor, the second end of the first neutralization capacitor is connected to the fourth end of the inter-stage matching network and the control electrode of the third transistor, the first end of the second neutralization capacitor is connected to the third end of the inter-stage matching network and the control electrode of the fourth transistor, and the second end of the second neutralization capacitor is connected to the second end of the output matching network and the second electrode of the third transistor.

[0025] Optionally, the low noise amplifier further includes a filtering module, wherein the filtering module is connected between the second end of the first primary coil and ground, and / or the filtering module is connected between the fourth power supply and ground.

[0026] Optionally, the low noise amplifier further comprises a signal input terminal and a signal output terminal;

[0027] The signal input end is connected to the input end of the input matching network, and the signal input end is used to input a radio frequency signal; the signal output end includes a signal output end positive pole and a signal output end negative pole;

[0028] The positive electrode of the output terminal is connected to the third terminal of the output matching network, and the negative electrode of the output terminal is connected to the fourth terminal of the output matching network.

[0029] According to another aspect of the present invention, a wireless transceiver system is provided, comprising the low noise amplifier described in any embodiment of the present invention.

[0030] The technical solution of the embodiment of the present invention, by setting an input matching network, a first-stage amplification network, an inter-stage matching network, a second-stage amplification network and an output matching network, when the input signal is a single-ended signal, the input impedance matching of the low-noise amplifier can be achieved through the input matching network, which can reduce the signal reflection of the input single-ended signal, thereby reducing the noise coefficient and improving the input return loss. The first-stage amplification network amplifies the input single-ended signal, and realizes the conversion of the single-ended signal to the differential signal through the inter-stage matching network, thereby improving the anti-interference ability of the signal and ensuring the accuracy and stability of signal transmission. The second-stage amplification network is used to provide secondary gain, and output impedance matching is performed through the output matching network. At the same time, the current multiplexing of the low-noise amplifier can be achieved through the inter-stage matching network and the output matching network, so that the power consumption is low.

[0031] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0033] Figure 1 A schematic diagram of the structure of a low noise amplifier provided according to an embodiment of the present invention;

[0034] Figure 2 A schematic diagram of the structure of another low noise amplifier provided according to an embodiment of the present invention;

[0035] Figure 3 A schematic diagram of the structure of another low noise amplifier provided according to an embodiment of the present invention;

[0036] Figure 4 A schematic diagram of the structure of another low noise amplifier provided according to an embodiment of the present invention;

[0037] Figure 5 A schematic diagram of a radio frequency signal direction provided according to an embodiment of the present invention;

[0038] Figure 6A schematic diagram of the structure of another low noise amplifier provided according to an embodiment of the present invention;

[0039] Figure 7 A schematic diagram of the structure of another low noise amplifier provided according to an embodiment of the present invention;

[0040] Figure 8 A schematic diagram of current flow in a low noise amplifier provided according to an embodiment of the present invention. DETAILED DESCRIPTION

[0041] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0042] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0043] Figure 1 is a schematic diagram of a low noise amplifier according to an embodiment of the present invention, referring to Figure 1The low noise amplifier comprises an input matching network 10, a first-stage amplifying network 20, an inter-stage matching network 30, a second-stage amplifying network 40 and an output matching network 50; a single-ended signal is input to the input end of the input matching network 10, a first end of the input matching network 10 is connected to a first power supply, and an output end of the input matching network 10 is connected to a first end of the first-stage amplifying network 20; the input matching network 10 is used for input impedance matching of the low noise amplifier; a second end of the first-stage amplifying network 20 is connected to a second power supply, a third end of the first-stage amplifying network 20 is connected to a first end of the inter-stage matching network 30, and a fourth end of the first-stage amplifying network 20 is grounded; a second end of the inter-stage matching network 30 is connected to a first end of the second-stage amplifying network 40, and a third end of the inter-stage matching network 30 is connected to a ground. The two ends are also grounded, the third end of the interstage matching network 30 is connected to the second end of the second-stage amplifying network 40, the fourth end of the interstage matching network 30 is connected to the third end of the second-stage amplifying network 40, and the fifth end of the interstage matching network 30 is connected to the third power supply; the interstage matching network 30 is used to convert the single-ended signal output by the first-stage amplifying network 20 into a differential signal; the first end of the output matching network 50 is connected to the fourth end of the second-stage amplifying network 40, the second end of the output matching network 50 is connected to the fifth end of the second-stage amplifying network 40, the third end of the output matching network 50 and the fourth end of the output matching network 50 output a differential signal, and the fifth end of the output matching network 50 is connected to the fourth power supply; the output matching network 50 is used for output impedance matching of the low noise amplifier.

[0044] Among them, the single-ended signal input to the input end of the input matching network 10 can be a radio frequency signal, the first power supply is used to provide a first power supply voltage VCC1, the second power supply is used to provide a second power supply voltage VCC2, and the first power supply voltage VCC1 and the second power supply voltage VCC2 are used to turn on the first-stage amplification network 20; the third power supply is used to provide a third power supply voltage VCC3, and the third power supply voltage VCC3 is used to turn on the second-stage amplification network 40; the fourth power supply is used to provide a fourth power supply voltage VCC3 and provide current for the low-noise amplifier.

[0045] Specifically, when the first-stage amplifier network 20 is turned on, the RF signal is amplified by the first-stage amplifier network 20 and then transmitted to the inter-stage matching network 30. The inter-stage matching network 30 realizes the conversion of the RF signal from single-ended to differential, and the differential signal is amplified twice by the second-stage amplifier network 40 and then transmitted to the output matching network 50. Furthermore, the output matching network 50 performs output impedance matching.

[0046] The technical solution of the embodiment of the present invention, by setting an input matching network, a first-stage amplification network, an inter-stage matching network, a second-stage amplification network and an output matching network, when the input signal is a single-ended signal, the input impedance matching of the low-noise amplifier can be achieved through the input matching network, which can reduce the signal reflection of the input single-ended signal, thereby reducing the noise coefficient and improving the input return loss. The first-stage amplification network amplifies the input single-ended signal, and realizes the conversion of the single-ended signal to the differential signal through the inter-stage matching network, thereby improving the anti-interference ability of the signal and ensuring the accuracy and stability of signal transmission. The second-stage amplification network is used to provide secondary gain, and output impedance matching is performed through the output matching network. At the same time, the current multiplexing of the low-noise amplifier can be achieved through the inter-stage matching network and the output matching network, so that the power consumption is low.

[0047] Continue to refer Figure 1 Optionally, the low noise amplifier also includes a signal input terminal Rfin and a signal output terminal; the signal input terminal Rfin is connected to the input terminal of the input matching network, and the signal input terminal is used to input the radio frequency signal; the signal output terminal includes a signal output positive terminal Rfout+ and a signal output negative terminal Rfout-; the output positive terminal Rfout+ is connected to the third terminal of the output matching network 50, and the output negative terminal Rfout- is connected to the fourth terminal of the output matching network 50.

[0048] The positive electrode of the signal output terminal Rfout+ and the negative electrode of the signal output terminal Rfout- are used to output differential signals.

[0049] Figure 2 FIG. 1 is a schematic diagram of the structure of another low noise amplifier provided according to an embodiment of the present invention, referring to FIG. Figure 2 On the basis of the above embodiment, the input matching network 10 includes a first capacitor C1, a first inductor L1 and a first resistor R1; the first end of the first capacitor C1 inputs a single-ended signal, the second end of the first capacitor C1 is connected to the first end of the first inductor L1, the second end of the first inductor L1 is connected to the first end of the first resistor R1 and the first end of the first-stage amplifier network 20, and the second end of the first resistor R1 is connected to the first power supply; the first resistor R1 is used to isolate the single-ended signal from the power supply signal of the first power supply.

[0050] Among them, the first capacitor C1 and the first inductor L1 are used to achieve input matching. Specifically, the first capacitor C1 can prevent direct current from passing through but allow alternating current to pass through; while the first inductor L1 can prevent alternating current from passing through but allow direct current to pass through. The first capacitor C1 and the first inductor L1 select and amplify signals of a specific frequency, thereby achieving input matching. Further, when the RF signal passes through the first capacitor C1 and the first inductor L1, the first capacitor C1 and the first inductor L1 respectively produce different responses to different frequency components of the RF signal. The first capacitor C1 has a large impedance to high-frequency signals, while the first inductor L1 has a large impedance to low-frequency signals, so that the first capacitor C1 and the first inductor L1 can jointly achieve frequency-selective absorption and reflection of the RF signal, thereby optimizing the transmission quality of the RF signal, thereby reducing the noise and loss caused by reflection. At the same time, the input RF signal is isolated from the power supply signal of the first power supply by the first resistor R1, which can reduce the reflection and interference of the input RF signal, ensure the stable transmission of the RF signal, and thus improve the stability and reliability of the amplifier. Input matching is achieved by setting the first capacitor, the first inductor and the first resistor, and the structure is simple.

[0051] Figure 3 FIG. 1 is a schematic diagram of the structure of another low noise amplifier provided according to an embodiment of the present invention, referring to FIG. Figure 3 On the basis of the above embodiments, the first-stage amplification network 20 includes a first transistor M1, a second transistor M2, a second resistor R2, a second capacitor C2 and a second inductor L2; the control electrode of the first transistor M1 is connected to the output end of the input matching network 10, the first electrode of the first transistor M1 is connected to the first end of the second inductor L2, the second electrode of the first transistor M1 is connected to the first electrode of the second transistor M2, the second electrode of the second transistor M2 is connected to the first end of the inter-stage matching network 30, the control electrode of the second transistor M2 is connected to the first end of the second resistor R2 and the first end of the second capacitor C2, the second end of the second resistor R2 is connected to the second power supply, and the second end of the second capacitor C2 and the second end of the second inductor L2 are grounded.

[0052] Among them, the first transistor M1 is used as a common-source amplifier to provide gain; the second inductor L2 can be specifically understood as the source negative feedback inductor of the first transistor M1. For example, negative feedback can effectively reduce the sensitivity of the gain of the common-source amplifier to the input signal, thereby improving the stability of the low-noise amplifier. In addition, the second inductor L2 can effectively adjust the input impedance of the amplifier. By appropriately selecting the inductance value of the second inductor L2, the input impedance is matched with the source impedance, the reflection loss is reduced, and the power transmission efficiency is improved, thereby reducing the signal attenuation caused by input noise. The second transistor M2 is used as a common-gate amplifier to increase the output voltage swing. The second capacitor C2 is used to provide a common-gate RF ground for the second transistor M2. The first transistor M1 and the second transistor M2 constitute a common-gate common-source structure. The use of this circuit structure can effectively suppress the feedthrough between the output and input signals and improve the reverse isolation of the circuit.

[0053] Specifically, the first transistor M1 and the second transistor M2 are used to amplify the input RF signal, and the first transistor M1 and the second transistor M2 share the same static bias current, which can achieve current multiplexing and reduce the power consumption of the low noise amplifier.

[0054] Figure 4 FIG. 1 is a schematic diagram of the structure of another low noise amplifier provided according to an embodiment of the present invention, referring to FIG. Figure 4 On the basis of the above embodiments, the inter-stage matching network 30 includes a first balun B1; the first balun B1 includes a first primary coil L11 and a first secondary coil L12; the first end of the first primary coil L11 is connected to the third end of the first-stage amplification network 20, the second end of the first primary coil L11 is connected to the first end of the second-stage amplification network 40, the second end of the first primary coil L11 is also grounded, the first end of the first secondary coil L12 is connected to the second end of the second-stage amplification network 40, the second end of the first secondary coil L12 is connected to the third end of the second-stage amplification network 40, and the middle tap of the first secondary coil L12 is connected to the third power supply.

[0055] The first balun B1 is a center tap structure, which is used to convert the RF signal amplified by the first stage amplification network 20 from a single-ended signal to a differential signal. Figure 5 A schematic diagram of a radio frequency signal trend according to an embodiment of the present invention is provided. Figure 5 , the first end input of the first balun B1 is a single-ended signal, and the third end and the fourth end output of the first balun B1 are differential signals.

[0056] Specifically, the first primary coil L11 supplies power to the drain of the first transistor M1 and the drain of the second transistor M2, the first secondary coil L12 supplies power to the second end and the third end of the second-stage amplification network 40, and the first primary coil L11 and the first secondary coil L12 are coupled to realize the transmission of the RF signal. By setting the first balun B1 with a center tap, the common mode noise can be effectively suppressed, the interference can be reduced, and the quality and stability of the output signal can be improved. At the same time, the first balun B1 is small in size, light in weight, and easy to integrate.

[0057] Optionally, continue to refer to Figure 4 The low noise amplifier further includes a filter module 60, which is connected between the second end of the first primary coil L11 and the ground.

[0058] The filtering module 60 may include a capacitor for filtering.

[0059] Figure 6 FIG. 1 is a schematic diagram of the structure of another low noise amplifier provided according to an embodiment of the present invention, referring to FIG. Figure 6 On the basis of the above embodiments, the output matching network 50 includes a second balun B2 and a third capacitor C3; the second balun B2 includes a second primary coil L21 and a second secondary coil L22; the first end of the second primary coil L21 is connected to the fourth end of the second-stage amplification network 40, the second end of the second primary coil L21 is connected to the fifth end of the second-stage amplification network 40, the first end of the second secondary coil L22 is connected to the first end of the third capacitor C3, the second end of the second secondary coil L22 is connected to the second end of the third capacitor C3, the first end of the third capacitor C3 and the second end of the third capacitor C3 output a differential signal, and the middle tap of the second primary coil L22 is connected to the fourth power supply.

[0060] The second primary coil L22 of the second balun B2 and the third capacitor C3 achieve output matching of the low noise amplifier.

[0061] Specifically, the second primary coil L21 is used to connect the fourth end and the fifth end of the second-stage amplification network 40 to the fourth power supply. The second primary coil L21 and the second secondary coil L22 realize the transmission of the RF signal through coupling. By setting the second balun B2 with a center tap, the common mode noise can be effectively suppressed and the interference can be reduced, thereby improving the quality and stability of the output signal. At the same time, the second balun B2 is small in size, light in weight, and easy to integrate. In addition, through the design of the first balun and the second balun, a signal gain with a positive slope can be achieved, and the balun structure can extend the bandwidth while maintaining signal integrity by realizing single-ended and differential conversion, as well as impedance transformation.

[0062] Optionally, continue to refer to Figure 6The low noise amplifier further includes a filtering module 60, and the filtering module 60 is connected between the fourth power supply and the ground.

[0063] Figure 7 FIG. 1 is a schematic diagram of the structure of another low noise amplifier provided according to an embodiment of the present invention, referring to FIG. Figure 7 On the basis of the above embodiments, the second-stage amplification network 40 includes a third transistor M3 and a fourth transistor M4; the control electrode of the third transistor M3 is connected to the fourth end of the inter-stage matching network 30, the first electrode of the third transistor M3 is connected to the first electrode of the fourth transistor M4 and the second end of the inter-stage matching network 30, the second electrode of the third transistor M3 is connected to the second end of the output matching network 50, and the second electrode of the fourth transistor M4 is connected to the first end of the output matching network 50.

[0064] Specifically, the third transistor M3 and the fourth transistor M4 are common-source amplifiers for providing a secondary gain.

[0065] Continue to refer Figure 7 Optionally, the second-stage amplification network 40 also includes a first neutralization capacitor C4 and a second neutralization capacitor C5; the first end of the first neutralization capacitor C4 is connected to the first end of the output matching network 50 and the second electrode of the fourth transistor M4, the second end of the first neutralization capacitor C4 is connected to the fourth end of the inter-stage matching network 30 and the control electrode of the third transistor M3, the first end of the second neutralization capacitor C5 is connected to the third end of the inter-stage matching network 30 and the control electrode of the fourth transistor M4, and the second end of the second neutralization capacitor C5 is connected to the second end of the output matching network 50 and the second electrode of the third transistor M3.

[0066] Among them, the third transistor M3 and the fourth transistor M4 are used as common source amplifiers, and the covering capacitance between the control electrode and the first electrode is the Miller capacitance, and is bridged between the control electrode and the second electrode. Therefore, the Miller effect increases the equivalent input capacitance, resulting in a decrease in the frequency characteristic.

[0067] Specifically, the first neutralization capacitor C4 is connected to the control electrode of the third transistor M3 and the second electrode of the fourth transistor M4, and the second neutralization capacitor C5 is connected to the control electrode of the fourth transistor M4 and the second electrode of the third transistor M3. Since the phases of the two paths in the differential signal circuit are opposite, the voltage on the first neutralization capacitor C4 and the second neutralization capacitor C5 is opposite to the voltage potential on the Miller capacitor, so that the current passing through the first neutralization capacitor C4 and the second neutralization capacitor C5 is exactly opposite to the current direction passing through the Miller capacitor, so as to achieve the purpose of mutual cancellation. By setting the first neutralization capacitor and the second neutralization capacitor, the reverse isolation of the amplifier can be reduced, the amplifier gain can be improved, and thus the stability of the amplifier can be improved.

[0068] Continue to refer Figure 7Optionally, the low noise amplifier further includes a third resistor R3, a first end of the third resistor R3 is connected to a third power supply, and a second end of the third resistor R3 is connected to a middle tap of the first secondary coil L12.

[0069] Figure 8 Schematic diagram of current flow of a low noise amplifier according to an embodiment of the present invention, with reference to Figure 8 Due to the existence of the first balun B1, power supply to the first-stage amplifying network 20 (the first transistor M1 and the second transistor M2) is realized, and current multiplexing of the first-stage amplifying network 20 (the first transistor M1 and the second transistor M2) and the second-stage amplifying network 40 (the third transistor M3 and the fourth transistor M4) is realized.

[0070] Optionally, an embodiment of the present invention further provides a wireless transceiver system, comprising the low noise amplifier provided by any of the above embodiments. Therefore, the wireless transceiver system also has the beneficial effects provided by the above embodiments.

[0071] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0072] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A low noise amplifier, characterized in that: It includes an input matching network, a first-stage amplifying network, an inter-stage matching network, a second-stage amplifying network and an output matching network; The input end of the input matching network inputs a single-ended signal, the first end of the input matching network is connected to a first power supply, and the output end of the input matching network is connected to the first end of the first-stage amplification network; the input matching network is used for input impedance matching of the low-noise amplifier; The second end of the first-stage amplification network is connected to the second power supply, the third end of the first-stage amplification network is connected to the first end of the inter-stage matching network, and the fourth end of the first-stage amplification network is grounded; the second end of the inter-stage matching network is connected to the first end of the second-stage amplification network, the second end of the inter-stage matching network is also grounded, the third end of the inter-stage matching network is connected to the second end of the second-stage amplification network, the fourth end of the inter-stage matching network is connected to the third end of the second-stage amplification network, and the fifth end of the inter-stage matching network is connected to the third power supply; the inter-stage matching network is used to convert the single-ended signal output by the first-stage amplification network into a differential signal; The first end of the output matching network is connected to the fourth end of the second-stage amplification network, the second end of the output matching network is connected to the fifth end of the second-stage amplification network, the third end of the output matching network and the fourth end of the output matching network output the differential signal, and the fifth end of the output matching network is connected to a fourth power supply; the output matching network is used for output impedance matching of the low-noise amplifier.

2. The low noise amplifier according to claim 1, characterized in that: The input matching network includes a first capacitor, a first inductor and a first resistor; The single-ended signal is input to the first end of the first capacitor, the second end of the first capacitor is connected to the first end of the first inductor, the second end of the first inductor is connected to the first end of the first resistor and the first end of the first-stage amplifier network, and the second end of the first resistor is connected to the first power supply; The first resistor is used to isolate the single-ended signal from a power signal of the first power supply.

3. The low noise amplifier according to claim 1, characterized in that: The first-stage amplification network includes a first transistor, a second transistor, a second resistor, a second capacitor, and a second inductor; The control electrode of the first transistor is connected to the output end of the input matching network, the first electrode of the first transistor is connected to the first end of the second inductor, the second electrode of the first transistor is connected to the first electrode of the second transistor, the second electrode of the second transistor is connected to the first end of the inter-stage matching network, the control electrode of the second transistor is connected to the first end of the second resistor and the first end of the second capacitor, the second end of the second resistor is connected to the second power supply, and the second end of the second capacitor and the second end of the second inductor are grounded.

4. The low noise amplifier according to claim 1, characterized in that: The inter-stage matching network includes a first balun; The first balun includes a first primary coil and a first secondary coil; The first end of the first primary coil is connected to the third end of the first-stage amplification network, the second end of the first primary coil is connected to the first end of the second-stage amplification network, the second end of the first primary coil is also grounded, the first end of the first secondary coil is connected to the second end of the second-stage amplification network, the second end of the first secondary coil is connected to the third end of the second-stage amplification network, and the middle tap of the first secondary coil is connected to the third power supply.

5. The low noise amplifier according to claim 1, characterized in that: The output matching network includes a second balun and a third capacitor; The second balun includes a second primary coil and a second secondary coil; The first end of the second primary coil is connected to the fourth end of the second-stage amplification network, the second end of the second primary coil is connected to the fifth end of the second-stage amplification network, the first end of the second secondary coil is connected to the first end of the third capacitor, the second end of the second secondary coil is connected to the second end of the third capacitor, the first end of the third capacitor and the second end of the third capacitor output the differential signal, and the middle tap of the second primary coil is connected to the fourth power supply.

6. The low noise amplifier according to claim 1, characterized in that: The second stage amplification network includes a third transistor and a fourth transistor; The control electrode of the third transistor is connected to the fourth end of the inter-stage matching network, the first electrode of the third transistor is connected to the first electrode of the fourth transistor and the second end of the inter-stage matching network, the second electrode of the third transistor is connected to the second end of the output matching network, and the second electrode of the fourth transistor is connected to the first end of the output matching network.

7. The low noise amplifier according to claim 6, characterized in that: Also included is a first neutralizing capacitor and a second neutralizing capacitor; The first end of the first neutralization capacitor is connected to the first end of the output matching network and the second electrode of the fourth transistor, the second end of the first neutralization capacitor is connected to the fourth end of the inter-stage matching network and the control electrode of the third transistor, the first end of the second neutralization capacitor is connected to the third end of the inter-stage matching network and the control electrode of the fourth transistor, and the second end of the second neutralization capacitor is connected to the second end of the output matching network and the second electrode of the third transistor.

8. The low noise amplifier according to any one of claims 1 to 7, characterized in that: Also includes: Filter module; The filter module is connected between the second end of the first primary coil and the ground, and / or the filter module is connected between the fourth power source and the ground.

9. The low noise amplifier according to claim 1, characterized in that: Also includes a signal input terminal and a signal output terminal; The signal input end is connected to the input end of the input matching network, and the signal input end is used to input a radio frequency signal; the signal output end includes a signal output end positive pole and a signal output end negative pole; The positive electrode of the output terminal is connected to the third terminal of the output matching network, and the negative electrode of the output terminal is connected to the fourth terminal of the output matching network.

10. A wireless transceiver system, characterized in that: A low noise amplifier comprising any one of claims 1 to 9.

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