Radio frequency power amplifier and radio frequency chip

Abstract

Provided are a radio frequency power amplifier and a radio frequency chip. An input end of an input matching circuit (1) is used for receiving a radio frequency signal; an output end of the input matching circuit (1) is connected to an input end of a power amplifier (3); a first end of a filter circuit (4) is connected to an external power supply voltage; an output end of the power amplifier (3) is separately connected to a second end of the filter circuit (4), a first end of a notch filter circuit (5), and an input end of a strongly coupled transformer (6); a second end of the notch filter circuit (5) is grounded; an output end of the strongly coupled transformer (6) is used for outputting the radio frequency signal; a first end of a high-order notch filter circuit (7) is connected to the output end of the strongly coupled transformer (6); and a second end of the high-order notch filter circuit (7) is grounded. The present utility model reduces the radio frequency matching area, and saves the space and cost of the radio frequency power amplifier. In addition, by means of the structural design of the strongly coupled transformer, the efficiency and performance of the radio frequency power amplifier are improved.

Description

Radio frequency power amplifier and radio frequency chip TECHNICAL FIELD

[0001] The utility model is suitable for wireless communication technical field, especially relates to a radio frequency power amplifier and radio frequency chip. BACKGROUND

[0002] In the fast development 5G communication system, the quality requirement of radio frequency signal is higher and higher, and the radio frequency module occupies the pivotal role, therefore design a high performance radio frequency power amplifier (PA) is particularly important. Meanwhile, with the integration of radio frequency circuit is higher and higher, the space that can be left for radio frequency power amplifier layout is smaller and smaller, miniaturization, high performance is the trend of future radio frequency power amplifier design.

[0003] The existing radio frequency power amplifier structure often includes input matching circuit, bias circuit, power supply VCC and output matching circuit, but the output matching circuit of the existing radio frequency power amplifier needs large layout space in actual design, which is not conducive to miniaturization, and the radio frequency matching bandwidth is narrow, the loss is large, and the design requirement of high efficiency, miniaturization radio frequency power amplifier cannot be met.

[0004] Therefore, a new radio frequency power amplifier and radio frequency chip are needed to solve the above technical problems.

[0005] Utility model content

[0006] The utility model provides a radio frequency power amplifier and radio frequency chip, aims at reducing the area of radio frequency matching of radio frequency power amplifier, saves space and cost, and enhances the efficiency and performance of radio frequency power amplifier.

[0007] The utility model provides a radio frequency power amplifier, including input matching circuit, bias circuit, power amplifier, filter circuit, trap circuit, strong coupling transformer and high order trap circuit;

[0008] The input end of input matching circuit is used as the input end of radio frequency power amplifier, and is used for receiving radio frequency signal, and the output end of input matching circuit is connected with the input end of power amplifier;

[0009] The output end of bias circuit is connected to the input end of power amplifier;

[0010] The first end of filter circuit is used for connecting external power supply voltage, and the second end of filter circuit is connected to the output end of power amplifier;

[0011] The first end of trap circuit is connected to the output end of power amplifier, and the second end of trap circuit is grounded, and is used for inhibiting second order harmonic;

[0012] The input end of the strong coupling transformer is connected to the output end of the power amplifier, and the output end of the strong coupling transformer serves as the output end of the radio frequency power amplifier, so as to realize output impedance matching and improve the efficiency of the radio frequency power amplifier.

[0013] The first end of the high-order trap circuit is connected to the output end of the strong coupling transformer, and the second end of the high-order trap circuit is grounded, so as to suppress third-order and higher harmonics.

[0014] Preferably, the strong coupling transformer comprises a primary coil and a secondary coil which are spaced apart and coupled, and a strong coupling structure, the first end of the primary coil serves as the input end of the strong coupling transformer, and the second end of the primary coil is grounded; the first end of the secondary coil is grounded, and the second end of the secondary coil serves as the output end of the strong coupling transformer; the strong coupling structure is arranged at the inner circumferential side of the primary coil and the secondary coil, so as to improve the coupling degree of the primary coil and the secondary coil.

[0015] Preferably, the length of the secondary coil is greater than the length of the primary coil.

[0016] Preferably, the secondary coil is spaced apart and wound into a first metal layer along the outer periphery of the strong coupling structure, the primary coil is spaced apart and wound into a second metal layer along the outer periphery of the strong coupling structure, the strong coupling transformer comprises a first metal via which penetrates the first metal layer and the second metal layer in sequence, and a second metal via which penetrates the second metal layer, the second end of the secondary coil passes through the first metal via and is spaced apart and wound into a third metal layer along the outer periphery of the strong coupling transformer, the strong coupling transformer further comprises a third metal via which penetrates the third metal layer, and the secondary coil is grounded after passing through the third metal via, and the first end of the primary coil is grounded after passing through the second metal via; the strong coupling structure comprises a first layer structure, a second layer structure and a third layer structure which are coupled and made of metal, the first layer structure and the first metal layer are located in the same plane, and the first metal layer is arranged around the first layer structure and spaced apart; the second layer structure and the second metal layer are located in the same plane, and the second metal layer is arranged around the second layer structure and spaced apart; the third layer structure and the third metal layer are located in the same plane, and the third metal layer is arranged around the third layer structure and spaced apart.

[0017] Preferably, the filter circuit comprises a first capacitor and a first inductor, the first end of the first inductor serves as the first end of the filter circuit, the first end of the first capacitor is connected to the first end of the first inductor, the second end of the first capacitor is grounded, and the second end of the first inductor serves as the second end of the filter circuit.

[0018] Preferably, the trap circuit comprises a second capacitor and a second inductor, a first end of the second capacitor is the first end of the trap circuit, a second end of the second capacitor is connected with a first end of the second inductor, and a second end of the second inductor is the second end of the trap circuit.

[0019] Preferably, the high-order trap circuit comprises a third capacitor and a third inductor, a first end of the third capacitor is the first end of the high-order trap circuit, a second end of the third capacitor is connected with a first end of the third inductor, and a second end of the third inductor is the second end of the high-order trap circuit.

[0020] Preferably, the radio frequency power amplifier further comprises a fourth capacitor, and the output end of the power amplifier is connected with the input end of the strongly coupled transformer through the fourth capacitor in series.

[0021] Preferably, the power amplifier comprises a first triode, a base of the first triode is the input end of the power amplifier, an emitter of the first triode is grounded, and a collector of the first triode is the output end of the power amplifier.

[0022] In a second aspect, the utility model also provides a radio frequency chip, the radio frequency chip comprises the radio frequency power amplifier of any one of the above-embodiments.

[0023] Compared with the prior art, the utility model discloses the input end of input matching circuit is used to receive radio frequency signals, the output end of input matching circuit is connected with the input end of power amplifier, the first end of filter circuit is used to connect external power voltage, the output end of power amplifier is connected with the second end of filter circuit, the first end of trap circuit and the input end of strongly coupled transformer respectively, the second end of trap circuit is grounded, the output end of strongly coupled transformer is used to output radio frequency signals, the first end of high-order trap circuit is connected with the output end of strongly coupled transformer, and the second end of high-order trap circuit is grounded. BRIEF DESCRIPTION OF DRAWINGS

[0024] The above and other aspects of the utility model will become more apparent and more readily appreciated from the following detailed description when considered in connection with the accompanying drawings, in which:

[0025] Fig. 1 is a circuit structure schematic diagram of the radio frequency power amplifier provided by the utility model embodiment;

[0026] Fig. 2 is a circuit structure schematic diagram of the strong coupling transformer of the radio frequency power amplifier provided by the embodiment of the present application;

[0027] Fig. 3 is a three-dimensional structure schematic diagram of the strong coupling transformer of the radio frequency power amplifier provided by the embodiment of the present application. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0029] Embodiment one

[0030] Please refer to Fig. 1, the present application provides a radio frequency power amplifier 100, which comprises an input matching circuit 1, a bias circuit 2, a power amplifier 3, a filter circuit 4, a notch circuit 5, a strong coupling transformer 6 and a high-order notch circuit 7;

[0031] The input end of the input matching circuit 1 serves as the input end of the radio frequency power amplifier 3, and is used for receiving a radio frequency signal. The output end of the input matching circuit 1 is connected with the input end of the power amplifier 3.

[0032] The output end of the bias circuit 2 is connected to the input end of the power amplifier 3. The bias circuit 2 is used for providing a bias voltage BIAS to the input end of the power amplifier 3.

[0033] The first end of the filter circuit 4 is used for connecting an external power supply voltage VCC. The second end of the filter circuit 4 is connected to the output end of the power amplifier 3.

[0034] The first end of the notch circuit 5 is connected to the output end of the power amplifier 3. The second end of the notch circuit 5 is grounded, and is used for suppressing a second-order harmonic.

[0035] The input end of the strong coupling transformer 6 is connected to the output end of the power amplifier 3. The output end of the strong coupling transformer 6 serves as the output end of the radio frequency power amplifier 3, and is used for realizing output impedance matching and improving the efficiency of the radio frequency power amplifier 3.

[0036] The first end of the high-order notch circuit 7 is connected with the output end of the strong coupling transformer 6. The second end of the high-order notch circuit 7 is grounded, and is used for suppressing a third-order and above harmonic.

[0037] Specifically, the radio frequency signal enters the input end of the power amplifier 3 through the output end of the input matching circuit 1, the bias circuit 2 provides a suitable bias voltage BIAS for the input end of the power amplifier 3, the filter circuit 4 provides direct current power supply for the output end of the power amplifier 3, the wave trap circuit 5 is used for suppressing the second harmonic, the radio frequency signal is coupled to the secondary coil L5 of the strong coupling transformer 6 through the primary coil L4 of the strong coupling transformer 6, the strong coupling structure 61 is arranged between the primary coil L4 and the secondary coil L5, the coupling degree of the primary coil L4 and the secondary coil L5 is increased, the radio frequency loss is reduced, and thus the efficiency of the radio frequency power amplifier 100 is improved. After the radio frequency signal passes through the strong coupling transformer 6, the radio frequency signal enters the high-order wave trap network to suppress the high-order harmonic, and thus the radio frequency signal with high quality is output.

[0038] In the embodiment of the utility model, the strong coupling transformer 6 includes the primary coil L4, the secondary coil L5 and the strong coupling structure 61 which are spaced apart and coupled, the first end of the primary coil L4 is as the input end of the strong coupling transformer 6, and the second end of the primary coil L4 is grounded, the first end of the secondary coil L5 is grounded, and the second end of the secondary coil L5 is as the output end of the strong coupling transformer 6, and the strong coupling structure 61 is arranged at the inner circumferential side of the primary coil L4 and the secondary coil L5 and is used for improving the coupling degree of the primary coil L4 and the secondary coil L5. Specifically, by adding the strong coupling structure 61, the coupling degree between the secondary coil L5 and the primary coil L4 can be effectively strengthened, the radio frequency loss is reduced, and the efficiency of the radio frequency power amplifier 100 is effectively improved.

[0039] In the embodiment of the utility model, the length of the secondary coil L5 is greater than the length of the primary coil L4.

[0040] In the embodiment of the utility model, the secondary coil L5 is spaced around the outer periphery of the strong coupling structure 61 to form a first metal layer M1, the primary coil L4 is spaced around the outer periphery of the strong coupling structure 61 to form a second metal layer M2, the strong coupling transformer 6 further comprises a first metal via 62 penetrating the first metal layer M1 and the second metal layer M2 in sequence and a second metal via 63 penetrating the second metal layer M2, the second end of the secondary coil L5 is spaced around the outer periphery of the strong coupling transformer 6 to form a third metal layer M3 through the first metal via 62, the strong coupling transformer 6 further comprises a third metal via 64 penetrating the third metal layer M3, the secondary coil L5 is grounded after penetrating the third metal via 64, and the first end of the primary coil L4 is grounded through the second metal via 63. The strong coupling structure 61 comprises a first layer structure and a second layer structure made of metal and coupled with each other, the first layer structure and the first metal layer M1 are located in the same plane (i.e. a first plane), and the first metal layer M1 is arranged around the first layer structure and spaced from each other; the second layer structure and the second metal layer M2 are located in the same plane (i.e. a second plane), and the second metal layer M2 is arranged around the second layer structure and spaced from each other; and the third layer structure and the third metal layer are located in the same plane (i.e. a third plane), and the third metal layer M3 is arranged around the third layer structure and spaced from each other.

[0041] Please refer to FIG. 2-3, FIG. 2 is the circuit structure schematic diagram of the strong coupling transformer 6 of the radio frequency power amplifier 100 provided by the embodiment of the utility model; FIG. 3 is the three-dimensional structure schematic diagram of the strong coupling transformer 6 of the radio frequency power amplifier 100 provided in the embodiment of the utility model. Define that the secondary coil L5 is wound on the first plane (i.e. the first metal layer M1), the primary coil L4 is wound on the second plane (i.e. the second metal layer M2), and the secondary coil L5 and the primary coil L4 are grounded after reaching the third plane (i.e. the third metal layer M3) through the first metal via 62, the second metal via 63 and the third metal via 64 respectively, thereby forming a winding structure with three layers. The strong coupling structure 61 further comprises a third layer structure, the third layer structure and the third metal layer M3 are located in the same plane (i.e. the third plane), and the third metal layer M3 is arranged around the third layer structure.

[0042] The secondary coil L5 winds two turns from the first metal layer M1, passes through the first metal via hole 62 to the third metal layer M3, winds one turn on the third metal layer M3, and is grounded through the third metal via hole 64; the strong coupling structure 61 is arranged between the primary coil L4 and the secondary coil, has a shape conforming to the winding center, and has a certain spacing from the primary coil L4 and the secondary coil L5; the strong coupling structure 61 is connected together from the first metal layer M1 to the third metal layer M3 through the first metal via hole 62 and the second metal via hole 63, and the coupling degree of the primary coil L4 and the secondary coil L5 is effectively enhanced through the structure design, and meanwhile, impedance matching can be adjusted.

[0043] It should be noted that the strong coupling transformer 6 and the strong coupling structure 61 also participate in impedance matching, so the number of turns of the primary coil L4 and the shape and size of the strong coupling structure 61 need to be adjusted. The shape of the strong coupling structure 61 can be set according to actual conditions, and the number of turns of the primary coil L4 and the secondary coil L5 on the first metal layer M1, the second metal layer M2 and the third metal layer M3 can be set according to actual conditions, which are not limited herein.

[0044] In the embodiment of the utility model, the filter circuit 4 includes first capacitor C1 and first inductor L1, the first inductor L1's first end as the filter circuit 4's first end, the first capacitor C1's first end is connected with the first inductor L1's first end, the second end of first capacitor C1 is grounded, the second end of first inductor L1 as the second end of filter circuit 4. First capacitor C1 is used to filter out the leaked radio frequency signal, and first inductor L1 is used to conduct direct current power supply while hindering radio frequency alternating current signal passing.

[0045] In the embodiment of the utility model, the filter circuit 4 includes first capacitor C1 and first indcutor L1, the first inductor L1's first end as the filter circuit 4's firs end, the first capacitor C1's first end is connected with the first inductor L1's first end, the second end of first capacitor C1 is grounded, the second end of first indcutor L1 as the second end of filter circuit 4. First capacitor C1 is used to filer out the leaked radio frequency signal, and first inductor L1 is used to conduct direct current powr supply while hindering radio frequency alternating current signal passing.

[0046] In the embodiment of the utility model, the filter circuit 4 includes first capacitor C1and first inductor L1, the first inductor L1's first end as the filter circuit4's first end, the first capacitor C1's first end is connected with the first inducto L1's first end, the second end of first capacitor C1 is grounded, the second en of first inductor L1 as the second end of filter circuit 4. First capacitor C is used to filter out the leaked radio frequency signal, and first inductor L1 is used t conduct direct current power supply while hindering radio frequency alternating cu signal passing.

[0047] In the embodiment of the utility model, the radio frequency power amplifier 100 further includes fourth capacitor C3, and the output end of the power amplifier 3 is connected with the input end of the strong coupling transformer 6 after being connected with the fourth capacitor C3 in series. The fourth capacitor C3 is an impedance matching capacitor.

[0048] In the embodiment of the utility model, the power amplifier 3 includes first triode Q1, the base of first triode Q1 is as the input end of power amplifier 3, the emitter of first triode Q1 is grounded, and the collector of first triode Q1 is as the output end of power amplifier 3.

[0049] Compared with the prior art, the utility model discloses an input matching circuit, an input end of the input matching circuit is used for receiving a radio frequency signal, an output end of the input matching circuit is connected with an input end of a power amplifier, a first end of a filter circuit is used for connecting an external power supply voltage, an output end of the power amplifier is connected with a second end of the filter circuit, a first end of a trap circuit and an input end of a strong coupling transformer respectively, a second end of the trap circuit is grounded, an output end of the strong coupling transformer is used for outputting the radio frequency signal, a first end of a high-order trap circuit is connected with the output end of the strong coupling transformer, and a second end of the high-order trap circuit is grounded.

[0050] Embodiment two

[0051] The utility model discloses still improve a kind of radio frequency chip, the radio frequency chip includes the radio frequency power amplifier 100 as described in above embodiment. The radio frequency chip can achieve the same technical effect as the radio frequency power amplifier 100 of above embodiment, which will not be repeated here.

[0052] It should be noted that in this document, the terms "comprise", "comprising", or any other variant thereof are intended to cover non-exclusive inclusions, so that processes, methods, articles or devices that include a series of elements not only include those elements, but also include other elements not explicitly listed, or include elements inherent to such processes, methods, articles or devices. Without more limitations, the element defined by the sentence "comprises a" does not exclude the existence of another identical element in the process, method, article or device comprising the element.

[0053] The embodiments of the utility model are described above in combination with the drawings, and the disclosed is only the preferred embodiment of the utility model, but the utility model is not limited to the above-mentioned specific implementation, and the above-mentioned specific implementation is only illustrative, not restrictive, and those skilled in the art can make many equivalent changes without departing from the purpose of the utility model and the scope of the claims, which are all within the protection of the utility model.

Claims

1. A radio frequency power amplifier, characterized by, The input matching circuit, the bias circuit, the power amplifier, the filter circuit, the trap circuit, the strong coupling transformer and the high-order trap circuit are arranged in sequence. The input end of the input matching circuit is used as the input end of the radio frequency power amplifier and is used for receiving a radio frequency signal. The output end of the bias circuit is connected to the input end of the power amplifier. The first end of the filter circuit is used for connecting an external power supply voltage, and the second end of the filter circuit is connected to the output end of the power amplifier. The first end of the trap circuit is connected to the output end of the power amplifier, and the second end of the trap circuit is grounded and is used for suppressing a second-order harmonic. The input end of the strong coupling transformer is connected to the output end of the power amplifier, and the output end of the strong coupling transformer is used as the output end of the radio frequency power amplifier and is used for realizing output impedance matching and improving the efficiency of the radio frequency power amplifier. The first end of the high-order trap circuit is connected to the output end of the strong coupling transformer, and the second end of the high-order trap circuit is grounded and is used for suppressing a third-order harmonic and a harmonic higher than the third-order harmonic.

2. The radio frequency power amplifier of claim 1, wherein, The strong coupling transformer comprises a primary coil and a secondary coil which are spaced apart and coupled, and a strong coupling structure, the first end of the primary coil is used as the input end of the strong coupling transformer, and the second end of the primary coil is grounded; the first end of the secondary coil is grounded, and the second end of the secondary coil is used as the output end of the strong coupling transformer; and the strong coupling structure is arranged on the inner circumferential side of the primary coil and the secondary coil and is used for improving the coupling degree of the primary coil and the secondary coil.

3. The radio frequency power amplifier of claim 2, wherein, The length of the secondary coil is greater than the length of the primary coil.

4. The radio frequency power amplifier of claim 2, wherein, The secondary coil is spaced apart and wound into a first metal layer along the outer periphery of the strong coupling structure, the primary coil is spaced apart and wound into a second metal layer along the outer periphery of the strong coupling structure, the strong coupling transformer further comprises a first metal via which penetrates the first metal layer and the second metal layer in sequence and a second metal via which penetrates the second metal layer, the second end of the secondary coil is spaced apart and wound into a third metal layer along the outer periphery of the strong coupling transformer through the first metal via, the strong coupling transformer further comprises a third metal via which penetrates the third metal layer, and the secondary coil is grounded after penetrating the third metal via, and the first end of the primary coil is grounded after penetrating the second metal via; and the strong coupling structure comprises a first layer structure, a second layer structure and a third layer structure which are coupled and are made of metal, the first layer structure and the first metal layer are located in the same plane, and the first metal layer surrounds the first layer structure and is spaced apart; the second layer structure and the second metal layer are located in the same plane, and the second metal layer surrounds the second layer structure and is spaced apart; and the third layer structure and the third metal layer are located in the same plane, and the third metal layer surrounds the third layer structure and is spaced apart.

5. The radio frequency power amplifier of claim 1, wherein, The filter circuit comprises a first capacitor and a first inductor, a first end of the first inductor is a first end of the filter circuit, a first end of the first capacitor is connected with the first end of the first inductor, a second end of the first capacitor is grounded, and a second end of the first inductor is a second end of the filter circuit.

6. The radio frequency power amplifier of claim 1, wherein, The trap circuit comprises a second capacitor and a second inductor, a first end of the second capacitor is a first end of the trap circuit, a second end of the second capacitor is connected with a first end of the second inductor, and a second end of the second inductor is a second end of the trap circuit.

7. The radio frequency power amplifier of claim 1, wherein, The high-order trap circuit comprises a third capacitor and a third inductor, a first end of the third capacitor is a first end of the high-order trap circuit, a second end of the third capacitor is connected with a first end of the third inductor, and a second end of the third inductor is a second end of the high-order trap circuit.

8. The radio frequency power amplifier of claim 1, wherein, The radio frequency power amplifier further comprises a fourth capacitor, and an output end of the power amplifier is connected with an input end of the strong coupling transformer through the fourth capacitor in series.

9. The radio frequency power amplifier of claim 1, wherein, The power amplifier comprises a first triode, a base of the first triode is an input end of the power amplifier, an emitter of the first triode is grounded, and a collector of the first triode is an output end of the power amplifier.

10. A radio frequency chip, characterized by The radio frequency chip comprises the radio frequency power amplifier according to any one of claims 1-9.

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