Power amplifier, power amplifier module and multi-mode multi-frequency power amplifier

Abstract

The application relates to the field of wireless communication technology and provides a power amplifier, a power amplification module and a multi-mode multi-frequency power amplifier. The power amplifier comprises a first-stage low-frequency power amplifier, a second-stage low-frequency power amplifier, a harmonic suppression circuit, a first output matching circuit, a first filter circuit and a second filter circuit; the first-stage low-frequency power amplifier and the second-stage low-frequency power amplifier are used for amplifying low-frequency signals; the harmonic suppression circuit is used for suppressing the harmonics output by the first-stage low-frequency power amplifier and the second-stage low-frequency power amplifier; and the output end of the first output matching circuit is used for outputting signals. The first output end of the first filter circuit and the output end of the second filter circuit respectively provide filtered power supply voltages for the first-stage low-frequency power amplifier and the second-stage low-frequency power amplifier. The application can optimize the harmonic leakage of the multi-mode multi-frequency power amplifier.

Description

Technical Field

[0001] This invention relates to the field of wireless communication technology, and in particular to a power amplifier, a power amplification module, and a multimode multi-frequency power amplifier. Background Technology

[0002] In 5G communication systems, multi-mode multi-band (MMMB) power amplifiers (PAs) need to implement carrier aggregation (CA) in the MB (mid-band, frequency range from 1710MHz to 2025MHz) and HB (high-band, frequency range from 2300MHz to 2690MHz). If harmonics from a portion of the LB (low-band, frequency range from 663MHz to 915MHz) frequency (where the second or third harmonic of the main frequency coincides with the CA frequency) leak to the MB and HB ports, they will interfere with the CA band signal and degrade the CA's receiving sensitivity. Therefore, 5G communication systems have strict requirements regarding the harmonic leakage level of the LB to the HB and MB.

[0003] Existing multimode multi-frequency power amplifiers are mostly packaged in 4.8mm x 6.3mm sizes, with the LB, MB, and HB bands distributed across different areas. The LB band has ample isolation from the other two, making it easy to achieve good harmonic leakage levels. However, for smaller multimode multi-frequency power amplifiers in 3mm x 3mm packages, the limited power interfaces (typically only two power supplies, VCC1 and VCC2) restrict the number of power interfaces. The first-stage power supplies for the LB, MB, and HB bands share a single VCC1, while the second-stage power supplies for the LB, MB, and HB bands share a single VCC2. Due to the smaller device size, the isolation between the three power supply lines is relatively poor. LB harmonics can leak to other frequency bands through the second-stage power supply line, resulting in significant harmonic leakage from the LB band to the HB and MB bands.

[0004] However, existing solutions to address harmonic leakage issues of the LB circuit for the HB and MB bands mainly include: increasing the spatial distance between the LB circuit and other frequency bands to reduce spatial radiation; and isolating the LB output matching line from other frequency band lines on the substrate using grounded copper foil. However, due to size limitations, these solutions are difficult to achieve the desired improvement in a 3mm × 3mm multimode multifrequency power amplifier. Summary of the Invention

[0005] To address the shortcomings of the existing technologies, this invention proposes a multi-mode multi-frequency power amplifier to solve the problem of severe harmonic leakage in existing multi-mode multi-frequency power amplifiers.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] In a first aspect, embodiments of the present invention provide a power amplifier, the power amplifier comprising a first-stage low-frequency power amplifier, a second-stage low-frequency power amplifier, a harmonic suppression circuit, a first output matching circuit, a first filter circuit, and a second filter circuit; the first-stage low-frequency power amplifier, the second-stage low-frequency power amplifier, the harmonic suppression circuit, and the first output matching circuit are electrically connected in sequence; the first-stage low-frequency power amplifier and the second-stage low-frequency power amplifier are used to amplify low-frequency signals, the harmonic suppression circuit is used to suppress harmonics output by the first-stage low-frequency power amplifier and the second-stage low-frequency power amplifier, and the output terminal of the first output matching circuit is used to output a signal; the input terminals of the first filter circuit and the second filter circuit are respectively connected to a first power supply, and the first output terminal of the first filter circuit and the output terminal of the second filter circuit provide filtered power supply voltages to the first-stage low-frequency power amplifier and the second-stage low-frequency power amplifier, respectively.

[0008] Preferably, the harmonic suppression circuit includes a first capacitor and a first inductor; the first terminal of the first capacitor is connected to the output terminal of the second-stage low-frequency power amplifier and the input terminal of the first output matching circuit, the second terminal of the first capacitor is connected to the first terminal of the first inductor, and the second terminal of the first inductor is grounded.

[0009] Preferably, the first output matching circuit includes a second capacitor, a third capacitor, a second inductor, a third inductor, and a fourth inductor;

[0010] The first terminal of the third capacitor serves as the input terminal of the first output matching circuit. The second terminal of the third capacitor is connected to the first terminal of the third inductor and the first terminal of the fourth inductor, respectively. The second terminal of the fourth inductor is grounded. The second terminal of the third inductor is connected to the first terminal of the second capacitor and serves as the output terminal of the first output matching circuit. The second terminal of the second capacitor is connected to the first terminal of the second inductor, and the second terminal of the second inductor is grounded.

[0011] Preferably, the power amplifier further includes a fourth capacitor, the first end of which is connected to the first end of the third inductor, and the second end of which is connected to the second end of the third inductor.

[0012] Preferably, the first output matching circuit includes a second capacitor, a third capacitor, a second inductor, and a third inductor;

[0013] The first end of the second inductor serves as the input terminal of the first output matching circuit. The second end of the second inductor is connected to the first end of the second capacitor and the first end of the third capacitor, respectively. The second end of the second capacitor is grounded. The second end of the third capacitor is connected to the first end of the third inductor and serves as the output terminal of the first output matching circuit. The third inductor is grounded.

[0014] Preferably, the first filter circuit includes a fifth inductor, a sixth inductor, and a fifth capacitor;

[0015] The first end of the fifth inductor serves as the input terminal of the first filter circuit, the second end of the fifth inductor is connected to the first end of the fifth capacitor and the first end of the sixth inductor respectively, and the second end of the fifth capacitor is grounded; the second end of the sixth inductor serves as the output terminal of the first filter circuit.

[0016] Preferably, the second filter circuit includes a sixth capacitor, a seventh capacitor, a seventh inductor, and an eighth inductor;

[0017] The first terminal of the sixth capacitor serves as the input terminal of the second filter circuit, the second terminal of the sixth capacitor is grounded, the first terminal of the seventh inductor is connected to the first terminal of the sixth capacitor and the input terminal of the first filter circuit, the second terminal of the seventh inductor is connected to the first terminal of the seventh capacitor and the first terminal of the eighth inductor, the second terminal of the seventh capacitor is grounded, and the second terminal of the eighth inductor serves as the output terminal of the second filter circuit.

[0018] Secondly, embodiments of the present invention also provide a power amplifier module, including an intermediate frequency power amplifier unit, a ninth inductor, a switch, an output port, and a power amplifier as described above;

[0019] The power amplifier is used to amplify low-frequency signals, the intermediate frequency power amplifier unit is used to amplify intermediate frequency signals, the control terminal of the switch is connected to the power amplifier and the intermediate frequency power amplifier unit respectively, the output terminal of the switch is connected to the output port, and the switch is used to switch the output of the power amplifier and the intermediate frequency power amplifier unit.

[0020] The intermediate frequency (IF) power amplifier unit includes a first-stage IF power amplifier, a second-stage IF power amplifier, and a second output matching circuit connected in sequence. The first-stage IF power amplifier and the second-stage IF power amplifier amplify the IF signal. The second output matching circuit matches the signal output by the second-stage IF power amplifier and outputs it to the control terminal of the switch. The first end of the ninth inductor is connected to the first filter circuit, and the second end of the ninth inductor is connected to the first-stage IF power amplifier. The first filter circuit provides a power supply voltage to the first-stage IF power amplifier through the second end of the ninth inductor.

[0021] Thirdly, embodiments of the present invention also provide a multimode multi-frequency power amplifier, including a substrate, a high-frequency power amplification unit integrated on the substrate, a tenth inductor, and a power amplification module as described above;

[0022] The high-frequency power amplifier unit amplifies high-frequency signals. The control terminal of the switch is connected to the power amplifier, the intermediate frequency power amplifier unit, and the high-frequency power amplifier unit respectively. The switch is used to switch the outputs of the power amplifier, the intermediate frequency power amplifier unit, and the high-frequency power amplifier unit.

[0023] The high-frequency power amplifier unit includes a first-stage high-frequency power amplifier, a second-stage high-frequency power amplifier, and a third output matching circuit connected in sequence. The first-stage and second-stage high-frequency power amplifiers are used to amplify the high-frequency signal, and the third output matching circuit is used to match the signal output by the second-stage high-frequency power amplifier and output it to the control terminal of the switch. The first-stage intermediate-frequency power amplifier and the first-stage high-frequency power amplifier share the first power supply, and the second-stage intermediate-frequency power amplifier and the second-stage high-frequency power amplifier share the second power supply.

[0024] The first end of the tenth inductor is connected to the first power supply, and the second end of the tenth inductor is connected to the first high-frequency power amplifier.

[0025] Preferably, the substrate has a first region and a second region, the first output matching circuit is located in the first region, the second output matching circuit and the third output matching circuit are both located in the second region, the ground terminal of the harmonic suppression circuit is connected to the substrate, and the ground terminals of the harmonic suppression circuit are all far away from the first region and the second region; and the distance between the ground terminal of the harmonic suppression circuit and the first region is smaller than the distance between the ground terminal of the harmonic suppression circuit and the second region.

[0026] Preferably, the distance between the ground terminal of the harmonic suppression circuit and the first region is less than 1 / 2 of the distance between the ground terminal of the harmonic suppression circuit and the second region.

[0027] Compared with related technologies, in the embodiments of the present invention, a first-stage low-frequency power amplifier, a second-stage low-frequency power amplifier, a harmonic suppression circuit, and a first output matching circuit are sequentially electrically connected. The first-stage and second-stage low-frequency power amplifiers are used to amplify low-frequency signals, the harmonic suppression circuit is used to suppress harmonics output by the first-stage and second-stage low-frequency power amplifiers, and the output terminal of the first output matching circuit is used to output signals. The input terminals of the first and second filter circuits are respectively connected to a first power supply, and the first and second output terminals of the first filter circuits provide filtered power supply voltages to the first-stage and second-stage low-frequency power amplifiers, respectively. The first output matching circuit can provide spatial isolation and absorb harmonics radiated by the low-frequency matching line. The first-stage intermediate-frequency power amplifier and the first-stage high-frequency power amplifier share the first power supply, and the second-stage intermediate-frequency power amplifier and the second-stage high-frequency power amplifier share the second power supply, achieving separation from the power supply of the second low-frequency power amplifier, avoiding circuit oscillation due to power supply chaos, and greatly optimizing harmonic leakage. Attached Figure Description

[0028] The present invention will now be described in detail with reference to the accompanying drawings. The above and other aspects of the present invention will become clearer and more readily understood through the detailed description following the accompanying drawings. In the drawings:

[0029] Figure 1 The circuit diagram of the power amplifier provided in Embodiment 1 of the present invention;

[0030] Figure 2 A circuit diagram of another first output matching circuit provided by the present invention;

[0031] Figure 3 This is a block diagram of the power amplifier module provided in Embodiment 2 of the present invention;

[0032] Figure 4 This is a schematic diagram of the chip pins of the multimode multi-frequency power amplifier provided in Embodiment 3 of the present invention;

[0033] Figure 5 This is a block diagram of the multimode multi-frequency power amplifier provided in Embodiment 3 of the present invention;

[0034] Figure 6 This is a circuit diagram of a multimode multi-frequency power amplifier provided in Embodiment 3 of the present invention;

[0035] Figure 7This is a schematic diagram of the layout of the substrate and chip of a multimode multi-frequency power amplifier provided in an embodiment of the present invention.

[0036] Among them, 100 is a multi-mode multi-frequency power amplifier; 1 is a substrate; A is the first region; B is the second region; 2 is a power amplifier; 21 is a first-stage low-frequency power amplifier; 22 is a second-stage low-frequency power amplifier; 23 is a harmonic suppression circuit; 231 is the ground terminal of the harmonic suppression circuit; 24 is the first output matching circuit; 25 is the first filter circuit; 26 is the second filter circuit; 30 is a power amplification module; 3 is an intermediate frequency power amplification unit; 31 is the first-stage intermediate frequency power amplifier; 32 is the second-stage intermediate frequency power amplifier; 33 is the second output matching circuit; 4 is a high-frequency power amplification unit; 41 is the first-stage high-frequency power amplifier; 42 is the second-stage high-frequency power amplifier; 43 is the third output matching circuit; 5 is a switch; and 6 is an output port. Detailed Implementation

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings of this application, are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, not to describe a particular order.

[0038] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] Example 1

[0041] Please see Figures 1-2As shown, this embodiment of the invention provides a power amplifier 2, which includes a first-stage low-frequency power amplifier 21, a second-stage low-frequency power amplifier 22, a harmonic suppression circuit 23, a first output matching circuit 24, a first filter circuit 25, and a second filter circuit 26. The first-stage low-frequency power amplifier 21, the second-stage low-frequency power amplifier 22, the harmonic suppression circuit 23, and the first output matching circuit 24 are electrically connected in sequence. The first-stage low-frequency power amplifier 21 and the second-stage low-frequency power amplifier 22 are used to amplify low-frequency signals. The harmonic suppression circuit 23 is used to suppress harmonics output by the first-stage low-frequency power amplifier 21 and the second-stage low-frequency power amplifier 22. The output terminal of the first output matching circuit 24 is used to output a signal. The input terminals of the first filter circuit 25 and the second filter circuit 26 are respectively connected to a first power supply. The first output terminal of the first filter circuit 25 and the output terminal of the second filter circuit 26 provide filtered power supply voltages to the first-stage low-frequency power amplifier 21 and the second-stage low-frequency power amplifier 22, respectively.

[0042] In this embodiment, the harmonic suppression circuit 23 includes a first capacitor C1 and a first inductor L1. The first terminal of the first capacitor C1 is connected to the output terminal of the second-stage low-frequency power amplifier 22 and the input terminal of the first output matching circuit 24, respectively. The second terminal of the first capacitor C1 is connected to the first terminal of the first inductor L1, and the second terminal of the first inductor L1 is grounded. The harmonic suppression circuit 23 can effectively suppress the second and fourth harmonics at the output terminal of the second-stage low-frequency power amplifier 22 using its resonant frequency. Simultaneously, it can also achieve the harmonic matching function of the power amplifier 2.

[0043] In this embodiment, the first output matching circuit 24 includes a second capacitor C2, a third capacitor C3, a second inductor L2, a third inductor L3, and a fourth inductor L4. The first terminal of the third capacitor C3 serves as the input terminal of the first output matching circuit 24. The second terminal of the third capacitor C3 is connected to the first terminals of both the third inductor L3 and the fourth inductor L4, and the second terminal of the fourth inductor L4 is grounded. The second terminal of the third inductor L3 is connected to the first terminal of the second capacitor C2 and serves as the output terminal of the first output matching circuit 24. The second terminal of the second capacitor C2 is connected to the first terminal of the second inductor L2, and the second terminal of the second inductor L2 is grounded. By placing the third inductor L3 in parallel with the second capacitor C2, along with the second inductor L2 connected in series and grounded, between the LB and other frequency band output matching circuits, its resonant frequency covers the LB harmonics, thus providing spatial isolation and absorbing the harmonics radiated by the first output matching circuit 24.

[0044] In this embodiment, the power amplifier 2 further includes a fourth capacitor C4. The first terminal of the fourth capacitor C4 is connected to the first terminal of the third inductor L3, and the second terminal of the fourth capacitor C4 is connected to the second terminal of the third inductor L3. The filter tank structure (LC Tank) formed by the fourth capacitor C4 and the third inductor L3 is used to suppress harmonics, reduce harmonic leakage at the source, and thus significantly improve the performance of LB in terms of MB and HB harmonic leakage levels.

[0045] As one embodiment of the present invention, such as Figure 2 As shown, the first output matching circuit 24 includes a second capacitor C21, a third capacitor C31, a second inductor L21, and a third inductor L31. The first terminal of the second inductor L21 serves as the input terminal of the first output matching circuit 24. The second terminal of the second inductor L21 is connected to both the first terminal of the second capacitor C21 and the first terminal of the third capacitor C31. The second terminal of the second capacitor C21 is grounded. The second terminal of the third capacitor C31 is connected to the first terminal of the third inductor L31 and serves as the output terminal of the first output matching circuit 24. The third inductor L31 is also grounded. This circuit can provide spatial isolation and absorb harmonics radiated by the first output matching circuit 24.

[0046] In this embodiment, the first filter circuit 25 includes a fifth inductor L5, a sixth inductor L6, a seventh inductor L7, and a fifth capacitor C5. The first end of the fifth inductor L5 serves as the input terminal of the first filter circuit 25. The second end of the fifth inductor L5 is connected to the first ends of the fifth capacitor C5, the sixth inductor L6, and the seventh inductor L7, respectively. The second end of the fifth capacitor C5 is grounded. The second end of the sixth inductor L6 serves as the first output terminal of the first filter circuit 25, and the second end of the seventh inductor L7 serves as the second output terminal of the first filter circuit 25. The fifth inductor L5 acts as an isolation inductor, isolating the first-stage high-frequency power amplifier 41 from the first-stage low-frequency power amplifier 21 and the first-stage intermediate-frequency power amplifier 31, respectively. The fifth inductor L5 has a relatively large inductance, resulting in good isolation performance.

[0047] In this embodiment, the second filter circuit 26 includes a sixth capacitor C6, a seventh capacitor C7, a seventh inductor L7, and an eighth inductor L8. The first terminal of the sixth capacitor C6 serves as the input terminal of the second filter circuit 26, and the second terminal of the sixth capacitor C6 is grounded. The first terminal of the seventh inductor L7 is connected to the first terminal of the sixth capacitor C6 and the input terminal of the first filter circuit 25. The second terminal of the seventh inductor L7 is connected to the first terminal of the seventh capacitor C7 and the first terminal of the eighth inductor L8, and the second terminal of the seventh capacitor C7 is grounded. The second terminal of the eighth inductor L8 serves as the output terminal of the second filter circuit 26. The sixth capacitor C6 allows the second-stage low-frequency power amplifier 22 and the first-stage high-frequency power amplifier 41 to share a single filter capacitor for power supply. The sixth capacitor C6 is isolated from the fifth capacitor C5 of the first-stage intermediate-frequency power amplifier 31 and the first-stage low-frequency power amplifier 21 through a large fifth inductor L5. This isolates the radio frequency signal from the DC / low-frequency circuit, preventing radio frequency energy leakage to the power supply network or other modules and avoiding mutual interference. At the same time, it can suppress noise and harmonics in the radio frequency band, preserving the purity of the target frequency signal.

[0048] Specifically, the third inductor L3 is connected in series with the third capacitor C3 and switch 5. The second inductor L2 and the second capacitor C2 are connected in series and then in parallel with the third inductor L3. Placing the third inductor L3 and the fourth inductor L4 connected in parallel with it away from the second region B (the positions of the MB and HB ports) increases the spatial distance. Furthermore, the eighth inductor L8 and the seventh capacitor C7 of the power amplifier 2 are placed to the right of the third inductor L3. Through careful design, the eighth inductor L8 and the seventh capacitor C7, using an LC circuit, eliminate harmonic interference and prevent harmonic leakage. Their resonant frequency covers the LB harmonic, thus simultaneously providing spatial isolation and harmonic absorption.

[0049] Example 2

[0050] Please see Figures 1-6 As shown, this embodiment of the invention provides a power amplifier module 30, including an intermediate frequency power amplifier unit 3, a ninth inductor L9, a switch 5, an output port 6, and a power amplifier 2 as described in Embodiment 1 above.

[0051] The power amplifier 2 is used to amplify low-frequency signals, the intermediate frequency power amplifier unit 3 is used to amplify intermediate frequency signals, the control terminal of the switch 5 is connected to the power amplifier 2 and the intermediate frequency power amplifier unit 3 respectively, the output terminal of the switch 5 is connected to the output port 6, and the switch 5 is used to switch the output of the power amplifier 2 and the intermediate frequency power amplifier unit 3.

[0052] The intermediate frequency power amplifier unit 3 includes a first-stage intermediate frequency power amplifier 31, a second-stage intermediate frequency power amplifier 32, and a second output matching circuit 33 connected in sequence. The first-stage intermediate frequency power amplifier 31 and the second-stage intermediate frequency power amplifier 32 are used to amplify the intermediate frequency signal. The second output matching circuit 33 is used to match the signal output by the second-stage intermediate frequency power amplifier 32 and output it to the control terminal of the switch 5. The first end of the ninth inductor L9 is connected to the first filter circuit 25, and the second end of the ninth inductor L9 is connected to the first-stage intermediate frequency power amplifier 31. The first filter circuit 25 is used to provide a power supply voltage to the first-stage intermediate frequency power amplifier 31 through the second end of the ninth inductor L9.

[0053] Example 3

[0054] Please see Figures 1-7 As shown, this embodiment of the invention provides a multimode multi-frequency power amplifier 100, including a substrate 1, a high-frequency power amplifier unit 4 integrated on the substrate 1, a tenth inductor L10, and a power amplifier module 30 as described in Embodiment 2 above.

[0055] The high-frequency power amplifier unit 4 amplifies high-frequency signals. The control terminal of the switch 5 is connected to the power amplifier 2, the intermediate-frequency power amplifier unit 3, and the high-frequency power amplifier unit 4, respectively. The switch 5 is used to switch the outputs of the power amplifier 2, the intermediate-frequency power amplifier unit 3, and the high-frequency power amplifier unit 4. The power amplifier 2 amplifies low-frequency signals, the intermediate-frequency power amplifier unit 3 amplifies intermediate-frequency signals, and the high-frequency power amplifier unit 4 amplifies high-frequency signals. The control terminal of the switch 5 is connected to the power amplifier 2, the intermediate-frequency power amplifier unit 3, and the high-frequency power amplifier unit 4, respectively. The output terminal of the switch 5 is connected to the output port 6. The switch 5 is used to switch the outputs of the power amplifier 2, the intermediate-frequency power amplifier unit 3, and the high-frequency power amplifier unit 4. The substrate 1 has a size of 3mm × 3mm, which is a microchip structure.

[0056] The high-frequency power amplifier unit 4 includes a first-stage high-frequency power amplifier 41, a second-stage high-frequency power amplifier 42, and a third output matching circuit 43 connected in sequence. The first-stage high-frequency power amplifier 41 and the second-stage high-frequency power amplifier 42 are used to amplify the high-frequency signal. The third output matching circuit 43 is used to match the signal output by the second-stage high-frequency power amplifier 42 and output it to the control terminal of the switch 5. The first-stage intermediate-frequency power amplifier 31 and the first-stage high-frequency power amplifier 41 share the first power supply, and the second-stage intermediate-frequency power amplifier 32 and the second-stage high-frequency power amplifier 42 share the second power supply. The first terminal of the tenth inductor L10 is connected to the first power supply VCC1, and the second terminal of the tenth inductor L10 is connected to the first-stage high-frequency power amplifier 41. Optionally, the circuit structures of the first output matching circuit 24, the second output matching circuit 33, and the third output matching circuit 43 are the same, but they can also be different.

[0057] The first power supply provides power to the first-stage low-frequency power amplifier 21, the second-stage low-frequency power amplifier 22, the first-stage intermediate-frequency power amplifier 31, and the first-stage high-frequency power amplifier 41. The second power supply provides a shared power source for the second-stage intermediate-frequency power amplifier 32 and the second-stage high-frequency power amplifier 42, thus achieving power separation between them and the second-stage low-frequency power amplifier 22, significantly optimizing harmonic leakage. The tenth inductor L10 suppresses power ripple and high-frequency noise, improving power quality.

[0058] In this embodiment, as Figure 7 As shown, the substrate 1 has a first region A and a second region B. The first output matching circuit 24 is located in the first region A, and the second output matching circuit 33 and the third output matching circuit 43 are both located in the second region B. The ground terminal 231 of the harmonic suppression circuit is connected to the substrate 1, and the ground terminals 231 of the harmonic suppression circuit are all far away from the first region A and the second region B; and the distance between the ground terminal 231 of the harmonic suppression circuit and the first region A is smaller than the distance between the ground terminal 231 of the harmonic suppression circuit and the second region B. The harmonic suppression circuit 23 can effectively suppress the second and fourth harmonics at the output of the low-band power amplifier 2 using its resonant frequency. The first region A represents... Figure 1The bottom layer has a 6-pin VBATT. To better suppress harmonics, the ground terminal 231 of the harmonic suppression circuit needs to be located as far away as possible from the first region A. Otherwise, these harmonic energies will couple into the power amplifier through the battery-powered (VBATT) line, causing serious harmonic leakage. At the same time, the ground terminal 231 of the harmonic suppression circuit should also be located as far away as possible from the second region B, that is, the ground terminal should be located between the first region A and the second region B. Furthermore, the location where the ground terminal connects to the substrate 1 should be as far away as possible from the first region A and the second region B, thereby reducing harmonic leakage.

[0059] In this embodiment, the distance between the ground terminal 231 of the harmonic suppression circuit and the first region A is less than half the distance between the ground terminal 231 of the harmonic suppression circuit and the second region B. This larger spacing greatly optimizes harmonic leakage.

[0060] Example 4

[0061] This invention also provides an RF chip, including the multimode multi-frequency power amplifier 100 as described above.

[0062] It should be noted that the various embodiments described above with reference to the accompanying drawings are merely illustrative of the present invention and not intended to limit its scope. Those skilled in the art should understand that any modifications or equivalent substitutions made to the present invention without departing from its spirit and scope should be included within the scope of the present invention. Furthermore, unless the context otherwise requires, words appearing in the singular include those in the plural, and vice versa. Additionally, unless specifically stated otherwise, all or part of any embodiment may be used in conjunction with all or part of any other embodiment.

Claims

1. A power amplifier, characterized in that, The power amplifier includes a first-stage low-frequency power amplifier, a second-stage low-frequency power amplifier, a harmonic suppression circuit, a first output matching circuit, a first filter circuit, and a second filter circuit. The first-stage low-frequency power amplifier, the second-stage low-frequency power amplifier, the harmonic suppression circuit, and the first output matching circuit are electrically connected in sequence. The first-stage and second-stage low-frequency power amplifiers are used to amplify low-frequency signals. The harmonic suppression circuit is used to suppress harmonics output by the first-stage and second-stage low-frequency power amplifiers. The output terminal of the first output matching circuit is used to output a signal. The input terminals of the first and second filter circuits are respectively connected to a first power supply. The first output terminal of the first filter circuit and the output terminal of the second filter circuit provide filtered power supply voltages to the first-stage and second-stage low-frequency power amplifiers, respectively. The first filter circuit includes a fifth inductor, a sixth inductor, and a fifth capacitor; The first end of the fifth inductor serves as the input terminal of the first filter circuit; the second end of the fifth inductor is connected to the first end of the fifth capacitor and the first end of the sixth inductor, respectively; the second end of the fifth capacitor is grounded; the second end of the sixth inductor serves as the output terminal of the first filter circuit. The second filter circuit includes a sixth capacitor, a seventh capacitor, a seventh inductor, and an eighth inductor; The first terminal of the sixth capacitor serves as the input terminal of the second filter circuit, the second terminal of the sixth capacitor is grounded, the first terminal of the seventh inductor is connected to the first terminal of the sixth capacitor and the input terminal of the first filter circuit, the second terminal of the seventh inductor is connected to the first terminal of the seventh capacitor and the first terminal of the eighth inductor, the second terminal of the seventh capacitor is grounded, and the second terminal of the eighth inductor serves as the output terminal of the second filter circuit.

2. The power amplifier according to claim 1, characterized in that, The harmonic suppression circuit includes a first capacitor and a first inductor; the first end of the first capacitor is connected to the output end of the second-stage low-frequency power amplifier and the input end of the first output matching circuit, the second end of the first capacitor is connected to the first end of the first inductor, and the second end of the first inductor is grounded.

3. The power amplifier according to claim 1, characterized in that, The first output matching circuit includes a second capacitor, a third capacitor, a second inductor, a third inductor, and a fourth inductor; The first terminal of the third capacitor serves as the input terminal of the first output matching circuit. The second terminal of the third capacitor is connected to the first terminal of the third inductor and the first terminal of the fourth inductor, respectively. The second terminal of the fourth inductor is grounded. The second terminal of the third inductor is connected to the first terminal of the second capacitor and serves as the output terminal of the first output matching circuit. The second terminal of the second capacitor is connected to the first terminal of the second inductor, and the second terminal of the second inductor is grounded.

4. The power amplifier according to claim 3, characterized in that, The power amplifier also includes a fourth capacitor, the first end of which is connected to the first end of the third inductor, and the second end of which is connected to the second end of the third inductor.

5. The power amplifier according to claim 1, characterized in that, The first output matching circuit includes a second capacitor, a third capacitor, a second inductor, and a third inductor; The first end of the second inductor serves as the input terminal of the first output matching circuit. The second end of the second inductor is connected to the first end of the second capacitor and the first end of the third capacitor, respectively. The second end of the second capacitor is grounded. The second end of the third capacitor is connected to the first end of the third inductor and serves as the output terminal of the first output matching circuit. The second end of the third inductor is grounded.

6. A power amplifier module, characterized in that, It includes an intermediate frequency power amplifier unit, a ninth inductor, a switch, an output port, and a power amplifier as described in any one of claims 1-5; The power amplifier is used to amplify low-frequency signals, the intermediate frequency power amplifier unit is used to amplify intermediate frequency signals, the control terminal of the switch is connected to the power amplifier and the intermediate frequency power amplifier unit respectively, the output terminal of the switch is connected to the output port, and the switch is used to switch the output of the power amplifier and the intermediate frequency power amplifier unit. The intermediate frequency (IF) power amplifier unit includes a first-stage IF power amplifier, a second-stage IF power amplifier, and a second output matching circuit connected in sequence. The first-stage IF power amplifier and the second-stage IF power amplifier amplify the IF signal. The second output matching circuit matches the signal output by the second-stage IF power amplifier and outputs it to the control terminal of the switch. The first end of the ninth inductor is connected to the first filter circuit, and the second end of the ninth inductor is connected to the first-stage IF power amplifier. The first filter circuit provides a power supply voltage to the first-stage IF power amplifier through the second end of the ninth inductor.

7. A multi-mode multi-frequency power amplifier, characterized in that, It includes a substrate, a high-frequency power amplifier unit integrated on the substrate, a tenth inductor, and a power amplifier module as described in claim 6; The high-frequency power amplifier unit amplifies high-frequency signals. The control terminal of the switch is connected to the power amplifier, the intermediate frequency power amplifier unit, and the high-frequency power amplifier unit respectively. The switch is used to switch the outputs of the power amplifier, the intermediate frequency power amplifier unit, and the high-frequency power amplifier unit. The high-frequency power amplifier unit includes a first-stage high-frequency power amplifier, a second-stage high-frequency power amplifier, and a third output matching circuit connected in sequence. The first-stage and second-stage high-frequency power amplifiers are used to amplify the high-frequency signal, and the third output matching circuit is used to match the signal output by the second-stage high-frequency power amplifier and output it to the control terminal of the switch. The first-stage intermediate-frequency power amplifier and the first-stage high-frequency power amplifier share the first power supply, and the second-stage intermediate-frequency power amplifier and the second-stage high-frequency power amplifier share the second power supply. The first end of the tenth inductor is connected to the first power supply, and the second end of the tenth inductor is connected to the first high-frequency power amplifier.

8. The multimode multi-frequency power amplifier according to claim 7, characterized in that, The substrate has a first region and a second region. The first output matching circuit is located in the first region, and the second output matching circuit and the third output matching circuit are both located in the second region. The ground terminal of the harmonic suppression circuit is connected to the substrate and is located between the first region and the second region. The distance between the ground terminal of the harmonic suppression circuit and the first region is smaller than the distance between the ground terminal of the harmonic suppression circuit and the second region.

9. The multimode multi-frequency power amplifier according to claim 8, characterized in that, The distance between the ground terminal of the harmonic suppression circuit and the first region is less than 1 / 2 of the distance between the ground terminal of the harmonic suppression circuit and the second region.

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