Amplification circuit, amplifier chip and wireless communication equipment

Abstract

The invention discloses an amplification circuit, an amplifier chip and a wireless communication device, and relates to the field of wireless communication, the amplification circuit comprises an input matching circuit, an output matching circuit, an amplification module and a mode switching module, the mode switching module is used for responding to a switching instruction, and the output matching circuit is used for outputting the switching instruction. And the control amplification module amplifies the radio frequency signal accessed by the input matching circuit according to an amplification mode corresponding to the switching instruction, and transmits the amplified radio frequency signal to the output matching circuit. According to the invention, the gain switching of the amplifying circuit can be realized to adapt to different signal strength requirements, so that the amplifying circuit is adapted to more wireless communication application scenes, and meanwhile, the application range of wireless communication equipment using the amplifying circuit is expanded.

Description

Technical Field

[0001] The present invention relates to the field of wireless communications, and in particular to an amplifier circuit, an amplifier chip and a wireless communications device. Background Art

[0002] As wireless communication technology becomes more and more popular, the demand for wireless communication hardware equipment in various industries is also increasing. Current wireless communication devices rely on internal amplifiers or amplification circuits to enhance signals. However, since the gain and output power of these amplification components are fixed, once they are installed in the device, the signal transmission and reception standards of the wireless communication device are determined, which limits the scope of application and operational flexibility of the wireless communication device.

[0003] Therefore, how to provide a solution to the above technical problems is a problem that those skilled in the art need to solve at present. Summary of the invention

[0004] The purpose of the present invention is to provide an amplifier circuit, an amplifier chip and a wireless communication device, which can realize gain switching of the amplifier circuit to adapt to different signal strength requirements, thereby adapting to more wireless communication application scenarios, and at the same time increasing the application scope of the wireless communication device using the amplifier circuit.

[0005] In order to solve the above technical problems, the present invention provides an amplifier circuit, comprising: an input matching circuit, an output matching circuit, an amplifier module and a mode switching module, wherein the amplifier module comprises a first transistor and a second transistor, the drain of the first transistor is respectively connected to the source of the second transistor and the first end of the mode switching module, the source of the first transistor is grounded, the drain of the second transistor is respectively connected to a power supply, the second end of the mode switching module and the output matching circuit, and the gate of the first transistor is connected to the input matching circuit;

[0006] The mode switching module is used to respond to the switching instruction, control the amplification module to amplify the RF signal connected to the input matching circuit according to the amplification mode corresponding to the switching instruction, and transmit the amplified RF signal to the output matching circuit; wherein the amplification mode is a first mode for amplifying the RF signal through the first transistor, or a second mode for amplifying the RF signal through the first transistor and the second transistor.

[0007] Optionally, the switching instruction includes a first instruction corresponding to the first mode and a second instruction corresponding to the second mode;

[0008] The mode switching module includes a switch tube and a resonant component connected in parallel between a first end and a second end of the switch tube, wherein the first end of the switch tube serves as the first end of the mode switching module, and the second end of the switch tube serves as the second end of the mode switching module;

[0009] The switch tube is used to be turned on when the control end thereof receives the first instruction, and turned off when the control end thereof receives the second instruction;

[0010] The resonant component is used to form resonance with the turn-off capacitor of the switch tube at the working frequency band of the switch tube when the switch tube is turned off.

[0011] Optionally, the resonant component includes a first microstrip line.

[0012] Optionally, the mode switching module further includes a first capacitor, which is connected in series with the resonant component.

[0013] Optionally, the switching instruction includes a first instruction corresponding to the first mode and a second instruction corresponding to the second mode;

[0014] The mode switching module includes a physical switch, a first end of the physical switch serves as the first end of the mode switching module, and a second end of the physical switch serves as the second end of the mode switching module. The physical switch is configured to be turned on when the first instruction is received to connect the drain of the first transistor with the output matching circuit, and to be turned off when the second instruction is received to disconnect the drain of the first transistor from the output matching circuit.

[0015] Optionally, the amplification circuit also includes a second microstrip line and a third microstrip line, the first end of the second microstrip line is connected to the power supply, the second end of the second microstrip line is respectively connected to the first end of the third microstrip line and the drain of the second transistor, and the second end of the third microstrip line is connected to the output matching circuit.

[0016] To solve the above technical problems, the present invention further provides an amplifier chip, comprising an input matching circuit, an output matching circuit, an amplification module and a mode switching module, which are prepared on the same substrate;

[0017] The amplification module includes a first transistor and a second transistor, each of which includes a gate, a drain and a source, the drain of the first transistor is respectively connected to the source of the second transistor and the first end of the mode switching module, the source of the first transistor is grounded, the drain of the second transistor is respectively connected to a power supply, the second end of the mode switching module and the output matching circuit, and the gate of the first transistor is connected to the input matching circuit.

[0018] To solve the above technical problems, the present invention further provides an amplifier circuit, comprising a first transistor, a second transistor, an input matching circuit, and an output matching circuit, wherein the drain of the first transistor is connected to the source of the second transistor, the source of the first transistor is grounded, the gate of the first transistor is connected to the input matching circuit, and the drain of the second transistor is connected to the output matching circuit;

[0019] Also includes a switch transistor, wherein a first end of the switch transistor is connected to a drain of the first transistor and a source of the second transistor, and a second end of the switch transistor is connected to a drain of the second transistor and the output matching circuit;

[0020] A resonant circuit is also included, which is connected in parallel between the first end and the second end of the switch transistor.

[0021] In order to solve the above technical problems, the present invention further provides a wireless communication device, comprising:

[0022] A controller, configured to determine a current operating mode of the wireless communication device and output a switching instruction according to the current operating mode;

[0023] An amplifier circuit as described in any one of the above.

[0024] Optionally, the process of determining the current operating mode of the wireless communication device includes:

[0025] The current operating mode of the wireless communication device is determined according to the current power consumption requirement and / or the target transmission distance of the wireless communication device.

[0026] The present invention provides an amplifier circuit, comprising a mode switching module and an amplifier module. The mode switching module responds to a switching instruction to adjust the amplifier mode of the amplifier module to a first mode or a second mode. In the first mode, a radio frequency signal is amplified by a first transistor to realize a low-gain working mode of the amplifier circuit. In the second mode, the radio frequency signal is amplified by the first transistor and the second transistor to realize a high-gain working mode of the amplifier circuit. The mode switching module can control the amplifier circuit to switch between a high-gain mode and a low-gain mode, so that the amplifier circuit can adapt to different signal strength requirements, thereby adapting to more wireless communication application scenarios, and at the same time increasing the application range of wireless communication devices using the amplifier circuit.

[0027] The present invention also provides an amplifier chip, a wireless communication device and another amplifier circuit, which have the same beneficial effects as the above amplifier circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention, the following briefly introduces the drawings required for use in 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 paying creative work.

[0029] Figure 1 A schematic diagram of the structure of a first amplifier circuit provided by the present invention;

[0030] Figure 2 A schematic diagram of the structure of an amplifier circuit in a first mode provided by the present invention;

[0031] Figure 3 A schematic diagram of the structure of the amplifier circuit in the second mode provided by the present invention;

[0032] Figure 4 A schematic diagram of the structure of a second amplifier circuit provided by the present invention;

[0033] Figure 5 This is a schematic diagram of the structure of a third amplifier circuit provided by the present invention. DETAILED DESCRIPTION

[0034] The core of the present invention is to provide an amplifier circuit, an amplifier chip and a wireless communication device, which can realize the gain switching of the amplifier circuit to adapt to different signal strength requirements, thereby adapting to more wireless communication application scenarios, and at the same time increasing the application scope of the wireless communication device using the amplifier circuit.

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution 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 part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] First, please refer to Figure 1 , Figure 1 This is a structural schematic diagram of an amplifier circuit provided by the present invention, the amplifier circuit includes: an input matching circuit 1, an output matching circuit 2, an amplifier module 3 and a mode switching module 4, the amplifier module 3 includes a first transistor M1 and a second transistor M2, the drain of the first transistor M1 is respectively connected to the source of the second transistor M2 and the first end of the mode switching module 4, the source of the first transistor M1 is grounded, the drain of the second transistor M2 is respectively connected to the power supply, the second end of the mode switching module 4 and the output matching circuit 2, and the gate of the first transistor M1 is connected to the input matching circuit 1;

[0037] The mode switching module 4 is used to respond to the switching instruction, control the amplification module 3 to amplify the RF signal connected to the input matching circuit 1 according to the amplification mode corresponding to the switching instruction, and transmit the amplified RF signal to the output matching circuit 2; wherein the amplification mode is a first mode for amplifying the RF signal through the first transistor M1, or a second mode for amplifying the RF signal through the first transistor M1 and the second transistor M2.

[0038] In this embodiment, the mode switching module 4 is used to make the amplifier circuit a reconfigurable amplifier circuit. Specifically, the amplifier circuit includes an input matching circuit 1 and an output matching circuit 2. The input matching circuit 1 is used to access the RF signal RF in to be processed, perform input matching on the RF signal RF in to be processed, and bias the gate of the first transistor M1. The output matching circuit 2 is used to perform output matching on the RF signal amplified by the amplifier module 3, and output the RF signal RFout.

[0039] The amplifying module 3 includes a first transistor M1 and a second transistor M2. The drain of the first transistor M1 is connected to the source of the second transistor M2. Figure 1 As shown, a point A is provided at the connection between the first transistor M1 and the second transistor M2, a first end of the mode switching module 4 is connected to the point A, a source of the first transistor M1 is grounded, and a drain of the second transistor M2 is connected to a power supply, an output matching circuit 2 and a second end of the mode switching module 4, as shown in FIG. Figure 1 As shown, a point B is provided at the connection end between the second end of the mode switching module 4 and the output matching circuit 2. The mode switching module 4 receives a switching instruction sent by an external controller, and the external controller includes but is not limited to a controller in a wireless communication device to which the amplifier circuit is applied. The mode switching module 4 responds to the switching instruction, and the switching instruction is used to indicate an amplification mode of the amplifier circuit, and the amplification mode includes a first mode in which the radio frequency signal is amplified by the first transistor M1, and a second mode in which the radio frequency signal is amplified by the first transistor M1 and the second transistor M2. For example, Figure 1 The medium bias voltage is Vd=5V, Vg2=3.1V, Vgs1=0.6V.

[0040] It can be understood that the mode switching module 4 can switch the amplification mode by controlling whether point A and point B are connected. If the mode switching module 4 controls point A and point B to be connected, the second transistor M2 in the amplification circuit is short-circuited, and only the first transistor M1 participates in the amplification process. The amplification circuit is currently in a single-tube amplification structure. Figure 2 As shown, the radio frequency signal is amplified according to the first mode. The amplification mode is suitable for signal amplification that does not require high gain but requires broadband, such as the receiving path of some wireless communication systems. For example, Figure 2 In the case where Vd=VA=VB=5V, Vg2=3.1V, Vgs1=0.6V, Vgs2=-1.9V, the first transistor M1 works in the saturation region, and the second transistor M2 works in the cut-off region. The mode switching module 4 controls the A point and the B point to be disconnected, so the first transistor M1 and the second transistor M2 in the amplifier circuit work together to form a common source and common gate amplifier structure. Figure 3 As shown, the radio frequency signal is amplified according to the second mode. For example, Figure 3 In the case where Vd=5V, VA=2.5V, Vg2=3.1V, Vgs1=Vgs2=0.6V, the first transistor M1 and the second transistor M2 operate in the saturation region.

[0041] It can be understood that the bandwidth of the single-tube amplifier structure is usually wider, suitable for broadband signal amplification, and the power consumption of the single-tube amplifier structure is relatively low when high gain is not required. The common source and common gate amplifier structure usually provides better linearity, suitable for amplifying nonlinear signals, and has a lower output impedance, which can better drive low-impedance loads. It can also provide better isolation between input and output, and is suitable for occasions requiring high gain and / or better linearity, such as the output stage of a power amplifier or the first stage of a high-sensitivity receiver.

[0042] Through this mode switching capability, the amplifier circuit can dynamically adjust its performance according to different signal characteristics and system requirements, thereby optimizing power consumption and bandwidth while maintaining system performance. This flexibility enables the amplifier circuit to adapt to a variety of wireless communication standards and application environments, improving the overall efficiency and adaptability of the system.

[0043] It can be seen that in this embodiment, the mode switching module 4 responds to the switching instruction to adjust the amplification mode of the amplification module 3 to the first mode or the second mode. In the first mode, the radio frequency signal is amplified by the first transistor M1 to realize the low-gain working mode of the amplification circuit. In the second mode, the radio frequency signal is amplified by the first transistor M1 and the second transistor M2 to realize the high-gain working mode of the amplification circuit. The mode switching module 4 can control the amplification circuit to switch between the high-gain mode and the low-gain mode, so that the amplification circuit can adapt to different signal strength requirements, thereby adapting to more wireless communication application scenarios, and at the same time increasing the application scope of wireless communication devices using the amplification circuit.

[0044] Based on the above embodiments:

[0045] Please refer to Figure 4 In an exemplary embodiment, the switching instruction includes a first instruction corresponding to the first mode and a second instruction corresponding to the second mode;

[0046] The mode switching module 4 includes a switch tube Q1 and a resonance component 41 connected in parallel between a first end and a second end of the switch tube Q1. The first end of the switch tube Q1 serves as a first end of the mode switching module 4, and the second end of the switch tube Q1 serves as a second end of the mode switching module 4.

[0047] The switch tube Q1 is used to be turned on when the control end thereof receives the first instruction, and turned off when the control end thereof receives the second instruction;

[0048] The resonant component 41 is used to form resonance with the turn-off capacitor of the switch tube Q1 at the working frequency band of the switch tube Q1 when the switch tube Q1 is turned off.

[0049] In this embodiment, the mode switching module 4 is mainly constructed by the switch tube Q1 and the resonant component 41, and the resonant component 41 includes but is not limited to an inductor, a microstrip line, etc. The resonant component 41 is arranged between the first end and the second end of the switch tube Q1. When the control end of the switch tube Q1 is connected to the first instruction to switch the amplification mode of the amplifier circuit to the first mode, the switch tube Q1 is turned on. When turned on, a low impedance path is formed between the first end and the second end of the switch tube Q1, so that the resonant component 41 is connected in parallel at both ends of the switch tube Q1, and a resonance effect is generated for a specific frequency, such as selectively amplifying or suppressing a signal of a specific frequency, thereby affecting the bandwidth of the amplifier circuit, and at the same time, the impedance matching between the switch tube Q1 and other parts of the amplifier circuit can be improved, and signal reflection and loss can be reduced. When the switch tube Q1 is turned on, the drain and source of the second transistor M2 are short-circuited, so that the radio frequency signal in the amplifier circuit is amplified only by the first transistor M1.

[0050] When the control end of the switch tube Q1 is connected to the second instruction to switch the amplification mode of the amplifier circuit to the second mode, it is disconnected. At this time, the switch tube Q1 no longer provides a low-impedance path, but generates a turn-off capacitor. This capacitor is determined by the physical structure and working principle of the switch tube Q1. The turn-off capacitor interacts with the resonant component 41 (such as an inductor, a microstrip line, etc.) in the working frequency band to form an LC resonant circuit. This resonant circuit will resonate at a specific frequency, resulting in a significant increase in the impedance of the circuit at this frequency. Since the resonant circuit presents a high impedance at the resonant frequency, the connection between point A and point B is almost completely disconnected, thereby cutting off the short-circuit path between the drain and source of the second transistor M2. It can be understood that the introduction of the resonant circuit can adjust the bandwidth of the amplifier circuit to make it more suitable for specific application requirements.

[0051] In this embodiment, the amplifier circuit can flexibly switch between single-tube amplification and common-source and common-gate amplification to adapt to different working conditions and performance requirements. In the second mode, the resonant circuit not only provides frequency selection and high impedance isolation, but also may help improve the overall performance of the circuit, such as reducing signal distortion and improving stability.

[0052] Reference Figure 5 In an exemplary embodiment, the mode switching module 4 further includes a first capacitor C1 , and the first capacitor C1 is connected in series with the resonant component 41 .

[0053] In this embodiment, the mode switching module 4 also includes a first capacitor C1 connected in series with the resonant component 41, which is used to isolate direct current and prevent the direct current voltage from passing through the resonant component 41, thereby protecting the resonant component 41 from the influence of the direct current voltage and avoiding the adverse effect of the direct current component on the performance of the amplifier circuit. Although the first capacitor C1 cuts off the direct current, it presents a low impedance to the AC signal, thereby allowing the radio frequency signal to pass smoothly through the resonant component 41, which is convenient for maintaining the AC characteristics of the amplifier circuit and ensuring that the amplification and transmission of the radio frequency signal are not affected. Furthermore, the first capacitor C1 and the resonant component 41 together form a bandpass filter, which can further select or limit the signal frequency passing through the amplifier circuit. By adjusting the value of the first capacitor C1, the resonant frequency can be changed, thereby adjusting the working bandwidth of the amplifier circuit. It can be understood that the first capacitor C1 plays a role in protecting the resonant component 41 in the mode switching module 4, and also optimizes the performance of the amplifier circuit, so that it can better adapt to different working environments and application requirements.

[0054] In an exemplary embodiment, the switching instruction includes a first instruction corresponding to the first mode and a second instruction corresponding to the second mode;

[0055] The mode switching module 4 includes a physical switch, a first end of the physical switch serves as the first end of the mode switching module 4, and a second end of the physical switch serves as the second end of the mode switching module 4. The physical switch is used to be turned on when a first instruction is received to connect the drain of the first transistor M1 with the output matching circuit 2, and to be disconnected when a second instruction is received to disconnect the drain of the first transistor M1 with the output matching circuit 2.

[0056] In this embodiment, in order to achieve a complete disconnection between point A and point B, the mode switching module 4 can also be constructed by a physical switch to achieve rapid switching of the amplification mode.

[0057] Reference Figure 5 In an exemplary embodiment, the amplifier circuit also includes a second microstrip line L1 and a third microstrip line L2, the first end of the second microstrip line L1 is connected to the power supply, the second end of the second microstrip line L1 is respectively connected to the first end of the third microstrip line L2 and the drain of the second transistor M2, and the second end of the third microstrip line L2 is connected to the output matching circuit 2.

[0058] It can be understood that the microstrip line can be used to achieve impedance matching between different parts of the circuit, reduce signal reflection and loss, and improve signal transmission efficiency. By accurately designing the width, length and dielectric constant of the microstrip line, the impedance matching between the amplifier circuit and the power supply, transistor and output matching circuit 2 can be ensured. The second microstrip line L1 connects the power supply and the drain of the second transistor M2, which can ensure that the transistor has a stable power supply. At the same time, the reflection and noise on the power line are reduced by impedance matching. It can also be used as part of the power decoupling network to help filter out high-frequency noise on the power line. The third microstrip line L2 connects the drain of the second transistor M2 and the output matching circuit 2, which can optimize the signal transmission from the transistor to the output module. Through proper layout, the third microstrip line L2 can help isolate the transistor and the output module and reduce the mutual influence between them.

[0059] Reference Figure 5 In an exemplary embodiment, the output matching circuit 2 includes but is not limited to a fourth microstrip line L3, a second capacitor C2 and a third capacitor C3, a first end of the fourth microstrip line L3 serves as an input end of the output matching circuit 2 connected to the second end of the mode switching module 4, a second end of the fourth microstrip line L3 is connected to a first end of the third capacitor C3 and a first end of the fourth capacitor, a second end of the third capacitor C3 is grounded, and a second end of the fourth capacitor serves as an output end of the output matching circuit 2.

[0060] Among them, the fourth microstrip line L3 is part of the signal path, which transmits the amplified RF signal from the mode switching module 4 to the output end. Its length and characteristic impedance have an impact on the frequency response and impedance matching of the entire circuit. The second capacitor C2, the third capacitor C3 and the fourth microstrip line L3 together form a filtering network for removing unnecessary frequency components and improving the purity of the signal. The third capacitor C3 is grounded to help stabilize the power supply and reduce noise. The third capacitor C2 is connected to the output end of the output matching circuit 2, which can provide additional filtering and help match the output impedance.

[0061] As another optional embodiment, a sub-microstrip line may be determined on the microstrip line connected to the drain of the first transistor M1 and the drain of the second transistor M2, and the sub-microstrip line and the harmonic auxiliary matching module together constitute a harmonic matching network at the drain end of the transistor. Figure 4Taking the first transistor M1 as an example, when the switch tube Q1 is turned on, the drain of the first transistor M1 is connected to the fourth microstrip line L3, and the fourth microstrip line L3 has a matching position. The area from the first end to the matching position in the fourth microstrip line is a sub-microstrip line, and the length of the sub-microstrip line is determined based on the optimal second harmonic impedance corresponding to the first transistor M1; a harmonic matching network includes a sub-microstrip line and an auxiliary matching module connected to the matching position, and the auxiliary matching module is used to short-circuit the second harmonic transmitted by the drain of the first transistor M1 to the ground at the matching position, so that the second harmonic impedance of the drain of the first transistor M1 reaches the optimal second harmonic impedance.

[0062] Specifically, the distance between the matching position and the first end of the fourth microstrip line L3, that is, the length L of the sub-microstrip line, can be calculated based on the following relationship. First, the optimal second harmonic impedance, the characteristic impedance of the fourth microstrip line L3, and the phase constant are obtained. The optimal second harmonic impedance Z opt satisfy , , from which we can get:

[0063] ;

[0064] Where β is the phase constant, , is the wavelength of the second harmonic, and Z0 is the characteristic impedance of the fourth microstrip line L3.

[0065] In summary, the present invention provides a reconfigurable cascode amplifier circuit structure, which can switch between the cascode amplifier structure and the single-tube amplifier structure by controlling a switch without changing the impedance matching circuit, thereby controlling the gain of the amplifier circuit. The structure is simple and practical.

[0066] In a second aspect, the present invention further provides an amplifier circuit, comprising a first transistor, a second transistor, an input matching circuit, and an output matching circuit, wherein the drain of the first transistor is connected to the source of the second transistor, the source of the first transistor is grounded, the gate of the first transistor is connected to the input matching circuit, and the drain of the second transistor is connected to the output matching circuit;

[0067] Also includes a switch transistor, wherein a first end of the switch transistor is connected to a drain of the first transistor and a source of the second transistor, and a second end of the switch transistor is connected to a drain of the second transistor and the output matching circuit;

[0068] A resonant circuit is also included, which is connected in parallel between the first end and the second end of the switch transistor.

[0069] The resonant circuit can be constructed by any one or more of an inductor, a microstrip line, and a capacitor.

[0070] For an introduction to an amplifier circuit provided by the present invention, please refer to the above-mentioned embodiment, and the present invention will not be described in detail here.

[0071] In a third aspect, the present invention further provides a wireless communication device, including:

[0072] A controller, configured to determine a current operating mode of the wireless communication device and output a switching instruction according to the current operating mode;

[0073] An amplifier circuit as described in any one of the above embodiments.

[0074] In an exemplary embodiment, the process of determining the current operating mode of the wireless communication device includes:

[0075] The current operating mode of the wireless communication device is determined according to the current power consumption requirement and / or the target transmission distance of the wireless communication device.

[0076] It can be understood that the controller monitors the power consumption requirements, target transmission distance, and other relevant parameters (such as signal quality, interference level, etc.) of the wireless communication device in real time. If the power consumption requirements of the wireless communication device are low, the controller may select a low-gain, low-power amplification mode. If the power consumption requirements are high, the controller may switch to a high-gain, high-power amplification mode to provide a stronger signal output. For short-distance transmission, a very high output power may not be required, and a low-gain mode may be selected. For long-distance transmission, a higher output power is required to ensure signal strength, so the controller switches to a high-gain mode. The controller dynamically adjusts the operating mode of the amplifier circuit to adapt to different communication environments and requirements, which not only improves the performance of the wireless communication device, but also optimizes energy use and extends the battery life of the device. In addition, it enhances the adaptability of the device, enabling it to maintain efficient communication in different wireless standards and application scenarios.

[0077] For an introduction to a wireless communication device provided by the present invention, please refer to the above embodiments, and the present invention will not be described in detail here.

[0078] A wireless communication device provided by the present invention has the same beneficial effects as the above-mentioned amplifier circuit.

[0079] In a fourth aspect, the present invention further provides an amplifier chip, comprising an input matching circuit, an output matching circuit, an amplification module and a mode switching module, which are prepared on the same substrate;

[0080] The amplification module includes a first transistor and a second transistor, each of which includes a gate, a drain and a source, the drain of the first transistor is respectively connected to the source of the second transistor and the first end of the mode switching module, the source of the first transistor is grounded, the drain of the second transistor is respectively connected to the power supply, the second end of the mode switching module and the output matching circuit, and the gate of the first transistor is connected to the input matching circuit.

[0081] All modules can be prepared on the same substrate, which can reduce signal transmission losses, improve the overall performance of the circuit, and also help reduce chip size, reduce costs, and improve production efficiency. Of course, the above modules can also be prepared on different substrates, depending on specific application requirements and manufacturing processes.

[0082] It should also be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0083] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An amplifier circuit, characterized in that: include: An input matching circuit, an output matching circuit, an amplifying module and a mode switching module, wherein the amplifying module comprises a first transistor and a second transistor, wherein the drain of the first transistor is respectively connected to the source of the second transistor and the first end of the mode switching module, the source of the first transistor is grounded, the drain of the second transistor is respectively connected to a power supply, the second end of the mode switching module and the output matching circuit, and the gate of the first transistor is connected to the input matching circuit; The mode switching module is used to respond to the switching instruction, control the amplification module to amplify the RF signal connected to the input matching circuit according to the amplification mode corresponding to the switching instruction, and transmit the amplified RF signal to the output matching circuit; wherein the amplification mode is a first mode for amplifying the RF signal through the first transistor, or a second mode for amplifying the RF signal through the first transistor and the second transistor.

2. The amplifier circuit according to claim 1, characterized in that: The switching instruction includes a first instruction corresponding to the first mode and a second instruction corresponding to the second mode; The mode switching module includes a switch tube and a resonant component connected in parallel between a first end and a second end of the switch tube, wherein the first end of the switch tube serves as the first end of the mode switching module, and the second end of the switch tube serves as the second end of the mode switching module; The switch tube is used to be turned on when the control end thereof receives the first instruction, and turned off when the control end thereof receives the second instruction; The resonant component is used to form resonance with the turn-off capacitor of the switch tube at the working frequency band of the switch tube when the switch tube is turned off.

3. The amplifier circuit according to claim 2, characterized in that: The resonant component includes a first microstrip line.

4. The amplifier circuit according to claim 2, characterized in that: The mode switching module further includes a first capacitor, which is connected in series with the resonant component.

5. The amplifier circuit according to claim 1, characterized in that: The switching instruction includes a first instruction corresponding to the first mode and a second instruction corresponding to the second mode; The mode switching module includes a physical switch, a first end of the physical switch serves as the first end of the mode switching module, and a second end of the physical switch serves as the second end of the mode switching module. The physical switch is configured to be turned on when the first instruction is received to connect the drain of the first transistor with the output matching circuit, and to be turned off when the second instruction is received to disconnect the drain of the first transistor from the output matching circuit.

6. The amplifier circuit according to any one of claims 1 to 5, characterized in that: The amplifier circuit also includes a second microstrip line and a third microstrip line, the first end of the second microstrip line is connected to the power supply, the second end of the second microstrip line is respectively connected to the first end of the third microstrip line and the drain of the second transistor, and the second end of the third microstrip line is connected to the output matching circuit.

7. An amplifier chip, characterized in that: It includes an input matching circuit, an output matching circuit, an amplification module and a mode switching module, which are prepared on the same substrate; The amplification module includes a first transistor and a second transistor, each of which includes a gate, a drain and a source, the drain of the first transistor is respectively connected to the source of the second transistor and the first end of the mode switching module, the source of the first transistor is grounded, the drain of the second transistor is respectively connected to a power supply, the second end of the mode switching module and the output matching circuit, and the gate of the first transistor is connected to the input matching circuit.

8. An amplifier circuit, characterized in that: The invention comprises a first transistor, a second transistor, an input matching circuit, and an output matching circuit, wherein the drain of the first transistor is connected to the source of the second transistor, the source of the first transistor is grounded, the gate of the first transistor is connected to the input matching circuit, and the drain of the second transistor is connected to the output matching circuit; Also includes a switch transistor, wherein a first end of the switch transistor is connected to a drain of the first transistor and a source of the second transistor, and a second end of the switch transistor is connected to a drain of the second transistor and the output matching circuit; A resonant circuit is also included, which is connected in parallel between the first end and the second end of the switch transistor.

9. A wireless communication device, characterized in that: include: A controller, configured to determine a current operating mode of the wireless communication device and output a switching instruction according to the current operating mode; An amplifier circuit as claimed in any one of claims 1 to 6, or an amplifier circuit as claimed in claim 8.

10. The wireless communication device according to claim 9, characterized in that The process of determining the current operating mode of the wireless communication device includes: The current operating mode of the wireless communication device is determined according to the current power consumption requirement and / or the target transmission distance of the wireless communication device.

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