Circuit integrated with power amplifier, transmitter

Abstract

The application provides a power amplifier integrated circuit and a transmitter, the power amplifier integrated circuit comprising: a power supply unit electrically connected to a power amplifier, for supplying power to the power amplifier; the power amplifier is further electrically connected to a direct current blocking unit, for blocking direct current in the output of the power amplifier; a differential-to-single-ended unit is electrically connected to the direct current blocking unit, for converting the differential output of the direct current blocking unit into a single-ended output and filtering out harmonics; the differential-to-single-ended unit is further electrically connected to an antenna through an impedance conversion unit, and the impedance conversion unit is electrically connected to the differential-to-single-ended unit, for adjusting the impedance of the output of the differential-to-single-ended unit to match the impedance of the antenna. The power amplifier integrated circuit provided by the application can improve the saturation power of the power amplifier, ensure the linearity, reduce the power loss and reduce the cost.

Description

Technical Field

[0001] This invention relates to the field of transmitter design technology, and in particular to a circuit and transmitter with an integrated power amplifier. Background Technology

[0002] In recent years, Narrow Band Internet of Things (NB-IoT) has developed rapidly. NB-IoT is an emerging technology in the IoT field, supporting low-power devices for cellular data connections over wide area networks (WANs), also known as Low Power Wide Area Networks (LPWANs). Drawing on mature protocols, the need to apply narrowband signals to private networks has also arisen. Private networks primarily operate in the 223-235MHz and 400-470MHz frequency bands. The uplink frequency of Band 5 is 824MHz-849MHz, and that of Band 8 is 880MHz-915MHz. The frequency bands of private networks are significantly lower than the uplink frequencies of Band 5 and Band 8 in general public networks, posing challenges to transmitter design. Furthermore, private networks have more stringent adjacent channel power leakage (ACP) requirements than NB-IoT.

[0003] Power amplifiers (PAs) are primarily used in transmitters, located at the final stage of the transmitting circuit, to amplify the transmitted signal. Key performance indicators (SPIs) for power amplifiers include saturation power, efficiency, and linearity. CMOS power amplifiers often suffer from insufficient saturation power and poor linearity; therefore, high-power power amplifiers typically employ non-CMOS technologies such as GaAs.

[0004] Typically, a low-power power amplifier (PA) is built into the transmitter. If higher power is required, an external power amplifier is usually added. This increases the overall cost of the module, presenting both opportunities and challenges for transmitters with integrated CMOS power amplifiers.

[0005] Therefore, the present invention provides a circuit and transmitter with an integrated power amplifier to improve the saturation power and linearity of the power amplifier inside the transmitter, and to reduce adjacent channel power leakage of the transmitter. Summary of the Invention

[0006] This invention provides a circuit and transmitter with an integrated power amplifier to solve the technical problems of existing CMOS power amplifiers, such as insufficient saturation power, poor linearity, and the inability of the transmitter to meet the adjacent channel power leakage index of private networks.

[0007] In a first aspect, the present invention provides a circuit integrating a power amplifier, comprising: a power amplifier, a power supply unit, a DC blocking unit, a differential-to-single-ended unit, and an impedance conversion unit; the power supply unit is electrically connected to the power amplifier for supplying power to the power amplifier; the power amplifier is also electrically connected to the DC blocking unit, which is used to block DC current in the output of the power amplifier; the differential-to-single-ended unit is electrically connected to the DC blocking unit for converting the differential output of the DC blocking unit into a single-ended output and filtering harmonics; the differential-to-single-ended unit is also electrically connected to an antenna through the impedance conversion unit, and the impedance conversion unit is used to adjust the impedance of the output of the differential-to-single-ended unit to match the impedance of the antenna.

[0008] Its beneficial effects are as follows: The circuit with integrated power amplifier provided by the present invention can improve the saturation power of the power amplifier and ensure linearity, while eliminating the need for an external power amplifier, reducing power loss and lowering costs.

[0009] Optionally, the power supply unit includes a first inductor and a second inductor. A first end of the first inductor is connected to a power source, a first end of the second inductor is connected to the power source, a second end of the first inductor is connected to a first output terminal of the power amplifier, and a second end of the second inductor is connected to a second output terminal of the power amplifier. Its advantages are: the power supply unit provided by this invention has a simple structure, requires very little area, and reduces costs.

[0010] Optionally, the DC blocking unit includes a first capacitor and a second capacitor. A first terminal of the first capacitor is connected to a second terminal of the first inductor and a first output terminal of the power amplifier. A first terminal of the second capacitor is connected to a second terminal of the second inductor and a second output terminal of the power amplifier. The second terminals of both the first and second capacitors are connected to the differential-to-single-ended unit. The advantage is that it provides a simple and easy-to-implement design for a DC blocking unit suitable for use with a differential power amplifier.

[0011] Optionally, the differential-to-single-ended converter includes a third capacitor, a fourth capacitor, and a balun. The first terminal of the third capacitor is connected to the second terminal of the first capacitor and the first input terminal of the balun. The first terminal of the fourth capacitor is connected to the second terminal of the second capacitor and the second input terminal of the balun. The second terminal of both the third and fourth capacitors is grounded. The first output terminal of the balun is connected to the impedance conversion unit, and the second output terminal of the balun is grounded. The beneficial effect is that the third and fourth capacitors are used for tuning to suppress harmonics.

[0012] Optionally, the impedance conversion unit includes a third inductor and a fifth capacitor. The first end of the third inductor is connected to the first output terminal of the balun, the second end of the third inductor is connected to the first end of the fifth capacitor and the antenna, and the second end of the fifth capacitor is grounded. Its advantage lies in that, by including the third inductor and the fifth capacitor in the impedance conversion unit, the impedance in the circuit integrating the power amplifier can be reduced, and it functions as a low-pass filter.

[0013] In a second aspect, the present invention provides a transmitter, comprising: a circuit integrating a power amplifier as described in any one of the first aspects, an input matching unit, a mixer, a first low-pass filter, a second low-pass filter, a first digital-to-analog converter, a second digital-to-analog converter, a data processing module, a phase-locked loop, and a power management unit; the data processing module includes a digital predistortion processing unit; the power amplifier, input matching unit, mixer, first low-pass filter, second low-pass filter, first digital-to-analog converter, second digital-to-analog converter, data processing module, phase-locked loop, and power management unit are all disposed on the chip of the transmitter, and the power supply unit, DC blocking unit, differential-to-single-ended unit, and impedance conversion unit are disposed outside the chip of the transmitter; The data processing module is electrically connected to the first digital-to-analog converter and the second digital-to-analog converter; the first digital-to-analog converter is also electrically connected to the first low-pass filter; the second digital-to-analog converter is also electrically connected to the second low-pass filter; the first low-pass filter is also electrically connected to the mixer, and the second low-pass filter is also electrically connected to the mixer; the mixer is electrically connected to the power amplifier through the input matching unit, which is used for impedance matching to ensure that the output of the mixer enters the power amplifier; the input matching unit is also electrically connected to the power management unit; the digital predistortion processing unit is used to cooperate with the power amplifier to reduce the adjacent channel power leakage of the transmitter to meet the requirements of narrowband private networks.

[0014] Its beneficial effects are as follows: The transmitter provided by the present invention improves the saturation power and linearity of the internal power amplifier and reduces adjacent channel power leakage while maintaining low cost.

[0015] Optionally, the power amplifier includes a first N-type transistor, a second N-type transistor, a third N-type transistor, and a fourth N-type transistor; the gate of the first N-type transistor is connected to the input matching unit, the source of the first N-type transistor is connected to the source of the second N-type transistor, and the drain of the first N-type transistor is connected to the source of the third N-type transistor; the gate of the second N-type transistor is connected to the input matching unit, and the drain of the second N-type transistor is connected to the source of the fourth N-type transistor; the gate of the third N-type transistor is connected to the gate of the fourth N-type transistor, and the drain of the third N-type transistor is connected to the second terminal of the first inductor and the first terminal of the first capacitor; the drain of the fourth N-type transistor is connected to the second terminal of the second inductor and the first terminal of the second capacitor. Its advantages are that the power amplifier provided by this invention adopts a differential structure, which improves the output voltage swing and output power.

[0016] Optionally, the input matching unit includes a fourth inductor, a sixth capacitor, and a seventh capacitor. The first end of the fourth inductor is connected to the first output terminal of the mixer and the first end of the sixth capacitor. The second end of the fourth inductor is connected to the second output terminal of the mixer and the first end of the seventh capacitor. The fourth inductor is also connected to the power management unit. The second end of the sixth capacitor is connected to the gate of the first N-type transistor, and the second end of the seventh capacitor is connected to the gate of the second N-type transistor. Its advantages are that the input matching unit provided by this invention eliminates the transformer in existing transmitters, reducing the output signal frequency while occupying a smaller area. Attached Figure Description

[0017] Figure 1 A schematic diagram of a circuit embodiment with an integrated power amplifier provided by the present invention;

[0018] Figure 2 This is a schematic diagram of a transmitter structure embodiment provided by the present invention;

[0019] Figure 3 A schematic diagram of a power amplifier embodiment provided by the present invention;

[0020] Figure 4 This is a schematic diagram of an embodiment of an input matching unit provided by the present invention;

[0021] Figure 5 A schematic diagram illustrating an embodiment of gain variation provided by the present invention;

[0022] Figure 6 A schematic diagram illustrating another embodiment of gain variation provided by the present invention;

[0023] Figure 7 This is a schematic diagram illustrating an embodiment of adjacent channel power leakage provided by the present invention. Detailed Implementation

[0024] The technical solutions of the embodiments of this application are described below with reference to the accompanying drawings. In the description of the embodiments of this application, the terminology used in the following embodiments is for the purpose of describing specific embodiments only and is not intended to limit the application. As used in the specification and appended claims of this application, the singular expressions "a," "the," "the," "the," and "this" are intended to also include expressions such as "one or more," unless the context clearly indicates otherwise. It should also be understood that in the following embodiments of this application, "at least one" and "one or more" refer to one or more (including two). The term "and / or" is used to describe the relationship between related objects, indicating that three relationships can exist; for example, A and / or B can represent: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship.

[0025] References to "one embodiment" or "some embodiments" in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized. The term "connection" includes direct connections and indirect connections, unless otherwise stated. "First" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0026] In the embodiments of this application, the words "exemplarily" or "for example" are used to indicate examples, illustrations, or explanations. Any embodiment or design described as "exemplarily" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design solutions. Specifically, the use of the words "exemplarily" or "for example" is intended to present the relevant concepts in a specific manner.

[0027] This invention provides a circuit and transmitter with an integrated power amplifier to solve the technical problems of existing CMOS power amplifiers, such as insufficient saturation power, poor linearity, and the inability of the transmitter to meet the adjacent channel power leakage index of private networks.

[0028] This invention provides a circuit integrating a power amplifier, such as... Figure 1 As shown, it includes: a power amplifier 101, a power supply unit 105, a DC blocking unit 102, a differential-to-single-ended unit 103, and an impedance conversion unit 104; the power supply unit 105 is electrically connected to the power amplifier 101 and is used to supply power to the power amplifier 101; the power amplifier 101 is also electrically connected to the DC blocking unit 102, which is used to block DC in the output of the power amplifier 101; the differential-to-single-ended unit 103 is electrically connected to the DC blocking unit 102 and is used to convert the differential output of the DC blocking unit 102 to a single-ended output and to filter harmonics; the differential-to-single-ended unit 103 is also electrically connected to an antenna through the impedance conversion unit 104. Figure 1 (Not shown), the impedance conversion unit 104 is used to adjust the impedance of the output of the differential-to-single-ended unit 103 to match the impedance of the antenna. Specifically, the harmonics include second and higher harmonics, which can be second, third, fourth, or fifth harmonics.

[0029] In some embodiments, the power supply unit includes a first inductor and a second inductor, a first end of the first inductor being connected to a power source, a first end of the second inductor being connected to the power source, a second end of the first inductor being connected to a first output terminal of the power amplifier, and a second end of the second inductor being connected to a second output terminal of the power amplifier.

[0030] In some embodiments, the DC blocking unit includes a first capacitor and a second capacitor. The first end of the first capacitor is connected to the second end of the first inductor and the first output terminal of the power amplifier. The first end of the second capacitor is connected to the second end of the second inductor and the second output terminal of the power amplifier. The second ends of the first capacitor and the second end of the second capacitor are both connected to the differential-to-single-ended unit.

[0031] In some embodiments, the differential-to-single-ended unit includes a third capacitor, a fourth capacitor, and a balun. The first terminal of the third capacitor is connected to the second terminal of the first capacitor and the first input terminal of the balun. The first terminal of the fourth capacitor is connected to the second terminal of the second capacitor and the second input terminal of the balun. The second terminal of the third capacitor is grounded, and the second terminal of the fourth capacitor is also grounded. The first output terminal of the balun is connected to the impedance conversion unit, and the second output terminal of the balun is grounded.

[0032] In some embodiments, the impedance conversion unit includes a third inductor and a fifth capacitor. The first end of the third inductor is connected to the first output terminal of the balun, the second end of the third inductor is connected to the first end of the fifth capacitor and the antenna, and the second end of the fifth capacitor is grounded.

[0033] Based on the integrated power amplifier circuit provided in the above embodiments, the present invention also provides a transmitter, comprising: the integrated power amplifier circuit, an input matching unit, a mixer, a first low-pass filter, a second low-pass filter, a first digital-to-analog converter, a second digital-to-analog converter, a data processing module, a phase-locked loop, and a power management unit; the data processing module includes a digital predistortion processing unit; the power amplifier, input matching unit, mixer, first low-pass filter, second low-pass filter, first digital-to-analog converter, second digital-to-analog converter, data processing module, phase-locked loop, and power management unit are all disposed on the transmitter chip, and the power supply unit, DC blocking unit, differential-to-single-ended converter unit, and impedance conversion unit are disposed on the transmitter chip. External to the chip; the data processing module is electrically connected to the first digital-to-analog converter and the second digital-to-analog converter; the first digital-to-analog converter is also electrically connected to the first low-pass filter; the second digital-to-analog converter is also electrically connected to the second low-pass filter; the first low-pass filter is also electrically connected to the mixer, and the second low-pass filter is also electrically connected to the mixer; the mixer is electrically connected to the power amplifier through the input matching unit, which is used for impedance matching to ensure that the output of the mixer enters the power amplifier; the input matching unit is also electrically connected to the power management unit; the digital predistortion processing unit is used to cooperate with the power amplifier to reduce the adjacent channel power leakage of the transmitter to meet the requirements of narrowband private networks.

[0034] In some embodiments, the power amplifier includes a first N-type transistor, a second N-type transistor, a third N-type transistor, and a fourth N-type transistor; the gate of the first N-type transistor is connected to the input matching unit, the source of the first N-type transistor is connected to the source of the second N-type transistor, and the drain of the first N-type transistor is connected to the source of the third N-type transistor; the gate of the second N-type transistor is connected to the input matching unit, and the drain of the second N-type transistor is connected to the source of the fourth N-type transistor; the gate of the third N-type transistor is connected to the gate of the fourth N-type transistor, and the drain of the third N-type transistor is connected to the second terminal of the first inductor and the first terminal of the first capacitor; the drain of the fourth N-type transistor is connected to the second terminal of the second inductor and the first terminal of the second capacitor.

[0035] In some embodiments, the input matching unit includes a fourth inductor, a sixth capacitor, and a seventh capacitor. The first end of the fourth inductor is connected to the first output terminal of the mixer and the first end of the sixth capacitor. The second end of the fourth inductor is connected to the second output terminal of the mixer and the first end of the seventh capacitor. The fourth inductor is also connected to the power management unit. The second end of the sixth capacitor is connected to the gate of the first N-type transistor, and the second end of the seventh capacitor is connected to the gate of the second N-type transistor.

[0036] To provide a more detailed description of the invention in this application, please refer again to... Figure 2 Provide a detailed description.

[0037] like Figure 2 The transmitter shown includes a data processing module (DIG) comprising a digital predistortion processing unit (DPD). The DPD is electrically connected to a first digital-to-analog converter (DAC1) and a second DAC2. DAC1 is also electrically connected to a first low-pass filter (LPF1). DAC2 is also electrically connected to a second low-pass filter (LPF2). LPF1 is electrically connected to a mixer (MX), and LPF2 is also electrically connected to the mixer (MX). The mixer (MX) is electrically connected to a power amplifier (PA) via an input matching unit. The input matching unit is used for impedance matching to ensure that the output of the mixer (MX) enters the power amplifier. The input matching unit is also electrically connected to a power management unit (PMU). The DPD works in conjunction with the power amplifier (PA) to reduce adjacent channel power leakage of the transmitter to meet the requirements of narrowband private networks, i.e., reducing it to or below the adjacent channel power leakage index of the narrowband private network.

[0038] The first end of the first inductor L1 is connected to the power supply, the first end of the second inductor L2 is connected to the power supply, the second end of the first inductor L1 is connected to the first output terminal of the power amplifier PA, and the second end of the second inductor L2 is connected to the second output terminal of the power amplifier PA. The DC blocking unit includes a first capacitor C1 and a second capacitor C2. The first end of the first capacitor C1 is connected to the second end of the first inductor L1 and the first output terminal of the power amplifier PA. The first end of the second capacitor C2 is connected to the second end of the second inductor L2 and the second output terminal of the power amplifier PA. The differential-to-single-ended unit includes a third capacitor C3, a fourth capacitor C4, and a balun (balanced-to-unbalanced) converter. The first end of the third capacitor C3 is connected to the second end of the first capacitor C1 and the first input terminal of the balun (balanced-to-unbalanced) converter. The first end of the fourth capacitor C4 is connected to the second end of the second capacitor C2 and the second input terminal of the balun (balanced-to-unbalanced) converter. The second end of the third capacitor C3 is grounded, the second end of the fourth capacitor C4 is grounded, and the second output terminal of the balun (balanced-to-unbalanced) converter is grounded. The impedance conversion unit includes a third inductor L3 and a fifth capacitor C5. The first end of the third inductor L3 is connected to the first output end of the balun converter BALUN, the second end of the third inductor L3 is connected to the first end of the fifth capacitor C5 and the antenna T1, and the second end of the fifth capacitor C5 is grounded.

[0039] Reference Figure 3 The power amplifier includes a first N-type transistor N1, a second N-type transistor N2, a third N-type transistor N3, and a fourth N-type transistor N4. The gate of the first N-type transistor N1 is connected to the input matching unit, the source of the first N-type transistor N1 is connected to the source of the second N-type transistor N2, and the drain of the first N-type transistor N1 is connected to the source of the third N-type transistor N3. The gate of the second N-type transistor N2 is connected to the input matching unit, and the drain of the second N-type transistor N2 is connected to the source of the fourth N-type transistor N4. The gate of the third N-type transistor N3 is connected to the gate of the fourth N-type transistor N4, and the drain of the third N-type transistor N3 is connected to the second terminal of the first inductor L1 and the first terminal of the first capacitor C1. The drain of the fourth N-type transistor N4 is connected to the second terminal of the second inductor L2 and the first terminal of the second capacitor C2.

[0040] Reference Figure 2 and Figure 3The input matching unit includes a fourth inductor L4, a sixth capacitor C6, and a seventh capacitor C7. The first end of the fourth inductor L4 is connected to the first output terminal of the mixer MX and the first end of the sixth capacitor C6. The second end of the fourth inductor L4 is connected to the second output terminal of the mixer MX and the first end of the seventh capacitor C7. The fourth inductor L4 is also connected to the power management unit (PMU). The second end of the sixth capacitor C6 is connected to the gate of the first N-type transistor N1, and the second end of the seventh capacitor C7 is connected to the gate of the second N-type transistor N2.

[0041] The purpose of this invention is to integrate a power amplifier into a narrowband private network transmitter using CMOS technology, thereby increasing integration density and reducing module area. This eliminates the need for an additional power amplifier chip, reducing the number of module components and lowering costs.

[0042] Preferably, the chip in the transmitter is a CMOS chip. The power supply unit, DC blocking unit, differential-to-single-ended unit, and impedance conversion unit in this invention are all located outside the transmitter chip, and a digital predistortion processing unit is introduced into the existing data processing module based on this.

[0043] Existing transmitters, due to design limitations, place the balun (balanced converter) inside the chip. This invention, however, places the balun outside the chip in conjunction with a third inductor, a fifth capacitor, and two fourth capacitors. This reduces power loss because CMOS PAs inherently have lower power ratings compared to other processes, thus ensuring the transmitter's power requirements are met. Furthermore, private networks operate on lower frequency bands; designing a balun on a CMOS chip would require a large area, increasing costs.

[0044] Figure 4 (a) in the diagram represents the input matching of a power amplifier in the prior art, which uses a transformer. Figure 4 (b) in the diagram represents the input matching unit of the power amplifier provided by this invention, which is an inductor-capacitor type. The main reason is that in some cases, the lower the frequency, the larger the area occupied by the transformer. Furthermore, since the frequency of the dedicated network band is low, the area of ​​the inductor-capacitor type provided by this invention is about half that of the transformer type at the same output frequency.

[0045] For the differential power amplifier provided in this invention, its input signal Vrfin = V2 - V1, output signal Vrfout = V3 - V4, and gain G = Vrfin / Vrfout. By taking the amplitude and phase of the gain, the following can be obtained: Figure 5The ideal curves in AMAM and AMPM are shown. Due to the inherent characteristics of CMOS MOSFET devices, such as the variation of equivalent capacitance with input / output power, the actual PA in AMAM and AMPM will deviate from the ideal curve. This invention employs a digital predistortion processing unit (DPD), where the actual gain G of the transmitter is equal to the product of the power amplifier gain and the gain of the DPD. Regarding the magnitude and phase of the gain, the DPD has complementary characteristics to the power amplifier PA, as shown in the reference... Figure 6 The DPD in the middle makes AMAM and AMPM closer to the ideal situation from the perspective of the entire transmitter, thus reducing adjacent channel power leakage (ACP). Figure 7 As shown, when the Digital Predistortion Processing Unit (DPD) is working, the adjacent channel power leakage (ACP) of the transmitter is effectively reduced by more than 15 dB compared to when the DPD is not working, thus meeting the requirements of narrowband private networks.

[0046] It is worth noting that, Figure 5 The actual PA in Figure 6 The curves corresponding to the actual PA and DPD in the example are only for reference. The specific settings should be based on the actual situation.

[0047] The above description is merely a specific implementation of the embodiments of this application, but the protection scope of the embodiments of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the embodiments of this application should be covered within the protection scope of the embodiments of this application. Therefore, the protection scope of the embodiments of this application should be determined by the protection scope of the claims.

Claims

1. A transmitter, characterized in that, include: The transmitter integrates a power amplifier circuit, an input matching unit, a mixer, a first low-pass filter, a second low-pass filter, a first digital-to-analog converter, a second digital-to-analog converter, a data processing module, a phase-locked loop, and a power management unit. The data processing module includes a digital predistortion processing unit. The power amplifier, input matching unit, mixer, first low-pass filter, second low-pass filter, first digital-to-analog converter, second digital-to-analog converter, data processing module, phase-locked loop, and power management unit are all located on the transmitter chip, while the power supply unit, DC blocking unit, differential-to-single-ended converter unit, and impedance conversion unit are located outside the transmitter chip. The data processing module is electrically connected to the first digital-to-analog converter and the second digital-to-analog converter; The first digital-to-analog converter is also electrically connected to the first low-pass filter; the second digital-to-analog converter is also electrically connected to the second low-pass filter; The first low-pass filter is also electrically connected to the mixer, and the second low-pass filter is also electrically connected to the mixer; The mixer is electrically connected to the power amplifier through the input matching unit, which is used for impedance matching to ensure that the output of the mixer enters the power amplifier; the input matching unit is also electrically connected to the power management unit. The digital predistortion processing unit is used in conjunction with the power amplifier to reduce adjacent channel power leakage of the transmitter in order to meet the requirements of narrowband private networks; The differential-to-single-ended unit includes a third capacitor, a fourth capacitor, and a balun. The first terminal of the third capacitor is connected to the second terminal of the first capacitor and the first input terminal of the balun. The first terminal of the fourth capacitor is connected to the second terminal of the second capacitor and the second input terminal of the balun. The second terminal of the third capacitor is grounded, and the second terminal of the fourth capacitor is also grounded. The first output terminal of the balun is connected to the impedance conversion unit, and the second output terminal of the balun is grounded.

2. The transmitter according to claim 1, characterized in that, The power amplifier includes a first N-type transistor, a second N-type transistor, a third N-type transistor, and a fourth N-type transistor; The gate of the first N-type transistor is connected to the input matching unit, the source of the first N-type transistor is connected to the source of the second N-type transistor, and the drain of the first N-type transistor is connected to the source of the third N-type transistor. The gate of the second N-type transistor is connected to the input matching unit, and the drain of the second N-type transistor is connected to the source of the fourth N-type transistor; The gate of the third N-type transistor is connected to the gate of the fourth N-type transistor, and the drain of the third N-type transistor is connected to the second terminal of the first inductor and the first terminal of the first capacitor. The drain of the fourth N-type transistor is connected to the second terminal of the second inductor and the first terminal of the second capacitor.

3. The transmitter according to claim 2, characterized in that, The input matching unit includes a fourth inductor, a sixth capacitor, and a seventh capacitor. The first end of the fourth inductor is connected to the first output terminal of the mixer and the first end of the sixth capacitor. The second end of the fourth inductor is connected to the second output terminal of the mixer and the first end of the seventh capacitor. The fourth inductor is also connected to the power management unit. The second end of the sixth capacitor is connected to the gate of the first N-type transistor, and the second end of the seventh capacitor is connected to the gate of the second N-type transistor.

4. The transmitter according to claim 1, characterized in that, The circuit integrating the power amplifier includes: a power amplifier, a power supply unit, a DC blocking unit, a differential-to-single-ended unit, and an impedance conversion unit; The power supply unit is electrically connected to the power amplifier and is used to supply power to the power amplifier; The power amplifier is also electrically connected to the DC blocking unit, which is used to block DC in the output of the power amplifier. The differential-to-single-ended unit is electrically connected to the DC blocking unit and is used to convert the differential output of the DC blocking unit into a single-ended output and to filter out harmonics. The differential-to-single-ended unit is also electrically connected to the antenna through the impedance conversion unit. The impedance conversion unit is used to adjust the output impedance of the differential-to-single-ended unit to match the impedance of the antenna.

5. The transmitter according to claim 4, characterized in that, The power supply unit includes a first inductor and a second inductor. The first end of the first inductor is connected to the power supply, the first end of the second inductor is connected to the power supply, the second end of the first inductor is connected to the first output terminal of the power amplifier, and the second end of the second inductor is connected to the second output terminal of the power amplifier.

6. The transmitter according to claim 5, characterized in that, The DC blocking unit includes a first capacitor and a second capacitor. The first end of the first capacitor is connected to the second end of the first inductor and the first output terminal of the power amplifier. The first end of the second capacitor is connected to the second end of the second inductor and the second output terminal of the power amplifier. The second ends of the first capacitor and the second end of the second capacitor are both connected to the differential-to-single-ended unit.

7. The transmitter according to claim 6, characterized in that, The impedance conversion unit includes a third inductor and a fifth capacitor. The first end of the third inductor is connected to the first output terminal of the balun, the second end of the third inductor is connected to the first end of the fifth capacitor and the antenna, and the second end of the fifth capacitor is grounded.

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