One-input three-output radio frequency power amplifier

Abstract

The utility model relates to the technical field of radio frequency communication antennas, and discloses a one-input three-output radio frequency power amplifier in order to solve the problem that different power outputs are needed in a communication system, which comprises a preceding-stage radio frequency amplification part, a final-stage radio frequency amplification part, a power supply part, a power control part and a power division coupling detection part, the input end of the preceding-stage radio frequency amplification part is connected with a signal output by the baseband board, one output end is connected with the input end of the last-stage radio frequency amplification part, and the other output end comprises a third output port C; the output end of the last-stage radio frequency amplification part is connected with the input end of the power division coupling detection part, and the output end of the power division coupling detection part comprises a first output port A and a second output port B; and the power control part is respectively connected with the preceding-stage radio frequency amplification part and the final-stage radio frequency amplification part. By adopting the one-input three-output radio frequency power amplifier, power reconfiguration of three output ports can be realized, and the requirement that different environments need different output powers is met.

Description

Technical Field

[0001] The utility model relates to the technical field of radio frequency communication antennas, and more specifically, to a radio frequency power amplifier with one input and three outputs. Background Art

[0002] In wireless communication systems, the RF power amplifier is a key component for wireless transmission of RF signals. Its function is to amplify the small signal generated by the modulation circuit and radiate it through the antenna. Its performance directly affects the system's communication quality, signal transmission strength, etc.

[0003] As a communication tool, RF power amplifiers enable simple mobile communications without requiring a relay station. Therefore, they are widely used in small-scale mobile communication projects such as production, security, and field engineering. However, current RF power amplifiers offer a fixed output power and cannot meet the varying output power requirements of different communication systems. Therefore, improvements are needed. Utility Model Content

[0004] In response to at least one defect or improvement need in the prior art, the present invention provides a one-input three-output radio frequency power amplifier, which can achieve power reconfiguration of the three output ports to meet the needs of different output powers in different environments.

[0005] To achieve the above-mentioned objectives, the present invention provides a one-input and three-output RF power amplifier, comprising a front-stage RF amplifier part, a final-stage RF amplifier part, a power supply part, a power control part, and a power division coupling detection part; the power supply part is respectively connected to the front-stage RF amplifier part, the final-stage RF amplifier part, the power control part, and the power division coupling detection part; the input end of the front-stage RF amplifier part is connected to the signal output by the baseband board, one output end is connected to the input end of the final-stage RF amplifier part, and the other output end includes a third output port C; the output end of the final-stage RF amplifier part is connected to the input end of the power division coupling detection part, and the output end of the power division coupling detection part includes a first output port A and a second output port B; the power control part is respectively connected to the front-stage RF amplifier part and the final-stage RF amplifier part.

[0006] Furthermore, the front-stage RF amplification part includes a first filter, a driving amplifier, a power splitter, a second filter, an amplifier, an adjustable attenuator, a temperature-compensated attenuator and a third filter, wherein the input end of the first filter is connected to the signal output by the baseband board, and the output end of the first filter is connected to the input end of the driving amplifier; the output end of the driving amplifier is connected to the input end of the power splitter; one path of the output end of the power splitter is connected to the input end of the second filter, the output end of the second filter is connected to the input end of the adjustable attenuator, the output end of the adjustable attenuator is connected to the input end of the temperature-compensated attenuator, and the output end of the temperature-compensated attenuator is connected to the input end of the final-stage RF amplification part; another path of the power splitter is connected to the input end of the amplifier, the output end of the amplifier is connected to the input end of the third filter, and the output end of the third filter is the third output port C.

[0007] Furthermore, the first filter, the second filter and the third filter are filters of the same model.

[0008] Furthermore, the final-stage RF amplification part includes a final-stage amplifier, a microwave isolator, and a cavity filter connected in sequence. The input end of the final-stage amplifier is connected to an output end of the previous-stage RF amplification part, and the output end of the cavity filter is connected to the input end of the power division coupling detection part.

[0009] Furthermore, the final-stage radio frequency amplifier part further includes an integrated MOS high-power modulation switch, which is respectively connected to the power control part and the final-stage amplifier.

[0010] Furthermore, the power control part includes a single-chip microcomputer and a serial communication chip. The single-chip microcomputer is respectively connected to the serial communication chip, the adjustable attenuator and the integrated MOS high-power modulation switch; the serial communication chip contains an external data interface for communicating with the control system. When receiving the power switching instruction, the instruction is transmitted to the single-chip microcomputer.

[0011] Furthermore, the power division and coupling detection part includes a microstrip power divider, two microstrip couplers, and two detectors. The microstrip power divider is connected to the two microstrip couplers respectively, each microstrip coupler is connected to the corresponding detector, and the output ports of the two detectors are the first output port A and the second output port B respectively.

[0012] Furthermore, the power division coupling detection part further includes two operational amplifiers, each operational amplifier being connected to a corresponding detector.

[0013] Furthermore, the power supply part includes a power supply module, a power supply filter and a power conversion circuit. The power conversion circuit includes a three-channel power supply chip, a first power conversion chip, and a second power conversion chip. The external power supply interface is connected to the power supply filter, the power supply filter is connected to the power supply module, and the power supply module is connected to the power conversion circuit.

[0014] Furthermore, the power supply part also includes a timing control circuit.

[0015] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0016] (1) The utility model provides a one-input three-output RF power amplifier, which can realize the power reconfiguration of the three output ports to meet the needs of different output powers in different environments. When the power supply capacity provided is limited and the transmission distance is small, it can switch to the third output port C for transmission, and close the first output port A and the second output port B; when the transmission distance is different, port A and port B can be opened according to actual needs, and the power size of port A and port B can be controlled to achieve different power outputs, which is safe and reliable.

[0017] (2) The one-input three-output RF power amplifier provided by the present invention can detect whether the output power is normal, so that the one-input three-output RF power amplifier can be fed back based on the detection voltage to determine whether it is working normally, thereby achieving rapid fault location. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 A schematic structural diagram of a one-input, three-output radio frequency power amplifier provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of this invention are intended only to describe specific embodiments and are not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0022] In the description of the present invention, it should be understood that the terms "upper", "lower", "vertical", "horizontal", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0023] It should be understood that the terms "first," "second," and similar terms used in the description of the present invention do not denote any order, quantity, or importance, but are simply used to distinguish different components. Unless the context clearly indicates otherwise, the singular form of "a," "an," or "the" and similar terms do not denote a limitation of quantity, but rather denote the presence of at least one. In addition, the terms "including," "comprising," and "having," and any variations thereof, are intended to cover non-exclusive inclusions.

[0024] Figure 1 This is a schematic diagram of a one-input, three-output RF power amplifier operating in the S-band (electromagnetic wave frequency range of 2-4 GHz). The RF power amplifier includes a pre-stage RF amplifier, a final RF amplifier, a power supply, a power control unit, and a power splitter coupling detection unit.

[0025] The power supply part is respectively connected to the front-stage RF amplifier part, the final-stage RF amplifier part, the power control part and the power division coupling detection part, and is used to supply power to the front-stage RF amplifier part, the final-stage RF amplifier part, the power control part and the power division coupling detection part respectively.

[0026] The input end of the front-stage RF amplifier part is connected to the signal output by the baseband board and is used to receive external power input; one output end of the front-stage RF amplifier part is connected to the input end of the final-stage RF amplifier part, and the other output end includes a third output port C; the output end of the final-stage RF amplifier part is connected to the input end of the power division coupling detection part through a microwave isolator and a cavity filter, and the output end of the power division coupling detection part includes a first output port A and a second output port B, that is, the power division coupling detection part outputs a dual-path RF signal.

[0027] In this embodiment, the front-stage RF amplifier part can realize the power output of the third output port C, and can provide driving power that meets different output powers for the first output port A and the second output port B.

[0028] The power control part is respectively connected to the front-stage RF amplifier part and the final-stage RF amplifier part, and is used to control the output power of the first output port A and the second output port B, thereby realizing the reconfiguration of the output power of the first output port A and the second output port B.

[0029] In one embodiment, Figure 1 As shown, the power supply section includes a power supply module, a power supply filter, and a power conversion circuit. The power conversion circuit includes a three-channel power supply chip, a delay circuit, power conversion chip 1, and power conversion chip 2. The external power supply interface is connected to the power supply filter, which is connected to the power supply module, which is connected to the power conversion circuit. The power supply section is used to convert the voltage output from the external power supply interface into +5V, +12V, -5V, +28V, +3.3V, and an EN control level, respectively. This enables the power supply section to provide +5V, -5V, and +12V operating voltages for the front-stage RF amplifier section, +28V and -5V operating voltages and an EN control level for the final-stage RF amplifier section, +3.3V operating voltage for the power control section, and +5V operating voltage for the power splitter coupling detection section.

[0030] In one embodiment, the front-stage RF amplification part includes a first filter, a driving amplifier, a power splitter, a second filter, an amplifier, an adjustable attenuator, a temperature-compensated attenuator and a third filter, wherein the input end of the first filter is connected to the signal output by the baseband board, and the output end of the first filter is connected to the input end of the driving amplifier; the output end of the driving amplifier is connected to the input end of the power splitter, the output end of the power splitter is connected to the input end of the second filter, the output end of the second filter is connected to the input end of the adjustable attenuator, the output end of the adjustable attenuator is connected to the input end of the temperature-compensated attenuator, and the output end of the temperature-compensated attenuator is connected to the input end of the final-stage RF amplification part to provide suitable driving power for the final-stage RF amplification part; another path of the power splitter is connected to the input end of the amplifier, the output end of the amplifier is connected to the input end of the third filter, and the output end of the third filter is the third output port C to achieve power output of the C port of the front-stage RF amplification part.

[0031] Among them, the adjustable attenuator is used to adjust the driving power and provide low-power or high-power input power to the first output port A and the second output port B. The first filter, the second filter and the third filter are used to filter the signal and output a power signal that meets the requirements. Preferably, the first filter, the second filter and the third filter use filters of the same model for signal filtering. The temperature-compensated attenuator is used to compensate the power signal at different temperatures so that its output power remains consistent at different temperatures. The driving amplifier is used to amplify the input power signal and provide the first output port A and the second output port B with power that meets the requirements. The power divider is used to divide the power amplified by the driving amplifier into two, one for driving the final power amplifier and the other for providing appropriate input power to the low-noise amplifier of the third output port C. The amplifier is used to amplify the power after power division to meet the output power requirements of port C. Preferably, the amplifier adopts a low-noise amplifier.

[0032] In this embodiment, the power output of the third output port C can be achieved through the power divider and amplifier in the front-stage RF amplification part. The power of the C port can be used when the distance is short and the current is small, and is not affected by the A port and the B port. The short circuit or open circuit of the C port does not affect the use of the A port and the B port.

[0033] The final RF amplifier can output the input signal in three power states: low power, high power, and silent. Depending on actual needs, different output powers can be achieved. In one embodiment, the final RF amplifier includes an integrated MOS high-power modulation switch (also called a modulator), a final amplifier (also called a power amplifier tube), a microwave isolator, and a cavity filter connected in sequence.

[0034] The input end of the final amplifier (i.e. the input end of the final RF amplifier part) is connected to an output end of the preceding RF amplifier part to amplify the RF power signal output by the preceding RF amplifier part. In addition, in order to ensure the normal operation of the final amplifier, it must first be powered by a negative voltage and then by a positive voltage. Therefore, a timing control circuit is added to the design of the power supply part (refer to Figure 1 The delay circuit in the circuit) is used to meet the normal operation requirements of the final amplifier.

[0035] The microwave isolator is used to isolate the amplified signal and prevent the amplified signal from returning to the final amplifier, thereby protecting the final amplifier. In other embodiments, the microwave isolator can also be replaced by other types of isolators. The output end of the cavity filter (i.e., the output end of the final RF amplifier part) is connected to the input end of the power division coupling detection part, and the cavity filter is used to suppress harmonics to meet the requirements of high harmonic suppression (for example, greater than 60dB). The integrated MOS high-power modulation switch is respectively connected to the power control part and the final amplifier, and is used to control the switch of the 28V power supply of the final amplifier, thereby realizing the power reconfiguration of the first output port A and the second output port B to output high power, low power and silent power.

[0036] In one embodiment, the power control unit includes a single-chip microcomputer and a serial communication chip (e.g., a 422 serial communication chip). The single-chip microcomputer is connected to the serial communication chip, the adjustable attenuator, and the integrated MOS high-power modulation switch. The serial communication chip includes an external data interface for communicating with the control system. When receiving a power switching instruction, it transmits the instruction to the single-chip microcomputer. The single-chip microcomputer controls the adjustable attenuator and the integrated MOS high-power modulation switch to achieve the reconfigurable power function of the three outputs (i.e., the first output port A, the second output port B, and the third output port C).

[0037] In this embodiment, a three-way reconfigurable output power is achieved through an adjustable attenuator, a single-chip microcontroller, and an integrated MOS high-power modulation switch, resulting in a flexible and diverse amplifier circuit with strong applicability. The RF signal input is amplified and filtered in the pre-stage, then outputs two signals through a power splitter. One signal is output through the amplifier at port C, and the output power of this port is unaffected by the outputs of ports A and B. The other signal output from the power splitter is filtered through an adjustable attenuator to achieve saturated output of the final power amplifier tubes at the RF output ports A and B. The power splitter then implements dual-channel output and power control.

[0038] The power splitter coupling detection section is used to achieve dual-path power output and detect whether the output power is normal. Specifically, a microstrip coupler couples the signal from the link using traditional microstrip coupling. A detector converts the coupled signal into a DC voltage output, which is then converted to the required voltage by an operational amplifier.

[0039] In one embodiment, Figure 1 As shown, the power splitter, coupling, and detection section includes a microstrip power splitter, two microstrip couplers, and two detectors. The microstrip power splitter is connected to the two microstrip couplers, and each microstrip coupler is connected to a corresponding detector. The microstrip power splitter is used to achieve dual-path power output. After the signal passes through the microstrip coupler, the detector converts the coupled signal into a DC voltage output. The output ports of the two detectors are first output port A and second output port B, respectively.

[0040] In other embodiments, the power splitter and coupling detection section includes a microstrip power splitter, two microstrip couplers, two detectors, and two operational amplifiers, each of which is connected to a corresponding detector. The operational amplifiers are used to amplify the voltage output by the detector to an appropriate value. When the detection voltage is abnormal, it can be determined that the output power is abnormal.

[0041] In this embodiment, the power splitter coupling detection section can detect whether the output power is normal. This allows for rapid fault location by providing feedback based on the detection voltage to determine whether the one-input, three-output RF power amplifier is functioning properly. This embodiment also provides a one-input, three-output RF power amplifier with advantages such as compact structure, flexible use, and strong applicability.

[0042] The above description is only an exemplary embodiment of the present disclosure and cannot be used to limit the scope of the present disclosure. That is, any equivalent changes and modifications made according to the teachings of the present disclosure are still within the scope of the present disclosure. After considering the specification and practicing the disclosure herein, those skilled in the art will easily think of the implementation scheme of the present disclosure. The present utility model is intended to cover any variation, use or adaptive change of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary technical means in the technical field not recorded in the present disclosure. The description and examples are to be regarded as exemplary only, and the scope and spirit of the present disclosure are defined by the claims.

[0043] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0044] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A one-input three-output radio frequency power amplifier, characterized in that: include: Pre-stage RF amplifier part, final stage RF amplifier part, power supply part, power control part, power division coupling detection part; The power supply part is connected to the front-stage radio frequency amplifier part, the final-stage radio frequency amplifier part, the power control part and the power division coupling detection part respectively; The input end of the front-stage RF amplifier part is connected to the signal output by the baseband board, one output end is connected to the input end of the final-stage RF amplifier part, and the other output end includes a third output port (C); the output end of the final-stage RF amplifier part is connected to the input end of the power division coupling detection part, and the output end of the power division coupling detection part includes a first output port (A) and a second output port (B); The power control part is respectively connected to the front-stage radio frequency amplifier part and the final-stage radio frequency amplifier part.

2. The radio frequency power amplifier according to claim 1, wherein: The front-stage RF amplification part includes a first filter, a driving amplifier, a power divider, a second filter, an amplifier, an adjustable attenuator, a temperature-compensated attenuator and a third filter, wherein: The input end of the first filter is connected to the signal output by the baseband board, and the output end of the first filter is connected to the input end of the driving amplifier; The output end of the driving amplifier is connected to the input end of the power divider; The output end of the power divider is connected to the input end of the second filter, the output end of the second filter is connected to the input end of the adjustable attenuator, the output end of the adjustable attenuator is connected to the input end of the temperature-compensated attenuator, and the output end of the temperature-compensated attenuator is connected to the input end of the final-stage RF amplifier; The other path of the power divider is connected to the input end of the amplifier, the output end of the amplifier is connected to the input end of the third filter, and the output end of the third filter is a third output port (C).

3. The radio frequency power amplifier according to claim 2, wherein: The first filter, the second filter, and the third filter are filters of the same model.

4. The radio frequency power amplifier according to claim 2, wherein: The final-stage RF amplification part includes a final-stage amplifier, a microwave isolator, and a cavity filter connected in sequence. The input end of the final-stage amplifier is connected to an output end of the previous-stage RF amplification part, and the output end of the cavity filter is connected to the input end of the power division coupling detection part.

5. The radio frequency power amplifier according to claim 4, wherein: The final-stage radio frequency amplifier part further includes an integrated MOS high-power modulation switch, and the integrated MOS high-power modulation switch is respectively connected to the power control part and the final-stage amplifier.

6. The radio frequency power amplifier according to claim 5, characterized in that: The power control part includes a single-chip microcomputer and a serial communication chip. The single-chip microcomputer is respectively connected to the serial communication chip, the adjustable attenuator and the integrated MOS high-power modulation switch; the serial communication chip contains an external data interface for communicating with the control system. When receiving a power switching instruction, the instruction is transmitted to the single-chip microcomputer.

7. The radio frequency power amplifier according to claim 1, wherein: The power division and coupling detection part includes a microstrip power divider, two microstrip couplers, and two detectors. The microstrip power divider is respectively connected to the two microstrip couplers, each microstrip coupler is connected to a corresponding detector, and the output ports of the two detectors are respectively a first output port (A) and a second output port (B).

8. The radio frequency power amplifier according to claim 7, wherein: The power division coupling detection part further includes two operational amplifiers, each operational amplifier being connected to a corresponding detector.

9. The radio frequency power amplifier according to claim 1, wherein: The power supply part includes a power supply module, a power supply filter and a power conversion circuit. The power conversion circuit includes a three-channel power supply chip, a first power conversion chip, and a second power conversion chip. The external power supply interface is connected to the power supply filter, the power supply filter is connected to the power supply module, and the power supply module is connected to the power conversion circuit.

10. The radio frequency power amplifier according to claim 9, characterized in that: The power supply part also includes a timing control circuit.

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