CN112491372A - Radio frequency power amplifying circuit based on artificial nonlinear matching network - Google Patents
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- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
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Abstract
The invention discloses a radio frequency power amplifying circuit based on an artificial nonlinear matching network, wherein the input end of a power amplifier transistor is respectively connected with a radio frequency signal input port and a radio frequency detection unit after passing through an input matching network and a phase compensation network, and the output end of the power amplifier transistor is connected with a radio frequency signal output port through the artificial nonlinear matching network; the radio frequency detection unit is respectively connected with the artificial nonlinear matching network and the phase compensation network after sequentially passing through the comparison and judgment unit, the cross-coupled logic inverter and the control signal generation and buffer unit, and the connection of elements in the artificial nonlinear matching network is configured through the radio frequency switch of power detection and logic control, so that the power amplifier transistor can obtain the optimal load impedance at two or more power points. The invention can realize that the power amplifier transistor obtains the optimal load impedance at two or more power points, and provides a scheme with a single branch and large bandwidth for the design and realization of the radio frequency power amplifying circuit with enhanced backspacing efficiency.
Description
Technical Field
The invention belongs to the technical field of radio frequency communication, and particularly relates to a radio frequency power amplifying circuit based on an artificial nonlinear matching network.
Background
In the advanced wireless communication, complex high-order modulated signals are widely adopted, and a radio frequency power amplifier with high backspacing efficiency becomes necessary.
At present, the mainstream technical approaches for improving the power amplifier rollback efficiency mainly include the following: the structure is a Doherty structure and an out-of-phase structure based on an active load impedance modulation technology; envelope tracking power amplifier and G-type power amplifier based on power source modulation technology; and thirdly, a structure for matching by utilizing the nonlinear junction capacitance of the diode.
The two power amplification structures of the Doherty and the outphasing at least comprise two power amplification branches, the backspacing efficiency is effectively improved based on active load impedance modulation, but the backspacing efficiency is increased at the cost of the increase of the complexity of a circuit structure, the increase of the circuit size and the increase of the product cost; in the power modulation type power amplifier, the power consumption of the power amplifier in a backspacing state is reduced by dynamically modulating the working voltage according to the signal power level, but the working mechanism of the power modulation type power amplifier depends on a specially designed power modulation circuit, so that the design complexity and the circuit complexity are increased on one hand, and the limited working bandwidth of the power modulation circuit limits the working bandwidth of the power amplifier on the other hand.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a radio frequency power amplifying circuit based on an artificial nonlinear matching network, aiming at the defects in the prior art, and the rollback efficiency of a radio frequency power amplifier is improved by adopting configurable load impedance matching controlled by a radio frequency switch responding to input power; the method has positive significance for improving the power efficiency of microwave and millimeter wave amplifying circuits and transmitting systems.
The invention adopts the following technical scheme:
a radio frequency power amplifying circuit based on an artificial nonlinear matching network comprises a power amplifier transistor, wherein the input end of the power amplifier transistor is connected with a radio frequency signal input port and a radio frequency detection unit respectively after passing through an input matching network and a phase compensation network, and the output end of the power amplifier transistor is connected with a radio frequency signal output port through the artificial nonlinear matching network; the radio frequency detection unit is respectively connected with the artificial nonlinear matching network and the phase compensation network after sequentially passing through the comparison judgment unit, the cross-coupled logic inverter and the control signal generation and buffer unit, and the connection of elements in the artificial nonlinear matching network is configured through a power detection and logic control radio frequency switch.
Specifically, the artificial nonlinear matching network comprises a configurable passive element based on radio frequency switch control, and the configurable passive element comprises a parallel binary configurable inductor and a series binary configurable inductor, wherein in the parallel binary configurable inductor, an inductor L1 and a radio frequency switch S1 are connected in series and then connected in parallel with an inductor L2; in the series binary configurable inductor, an inductor L3 is connected in series with a radio frequency switch S2 and an inductor L4 which are connected in parallel; the two structures of the parallel connection type binary configurable inductor and the series connection type binary configurable inductor generate any two effective inductance values by controlling the on-off of the radio frequency switches S1 and S2.
Specifically, the artificial nonlinear matching network comprises a configurable passive element based on radio frequency switch control, the configurable passive element comprises a parallel binary configurable capacitor and a series binary configurable capacitor, and in the parallel binary configurable capacitor, a capacitor C1 and a radio frequency switch S3 are connected in series and then connected in parallel with a capacitor C2; in the series binary configurable capacitor, the capacitor C4 is connected in parallel with the radio frequency switch S4 and then connected in series with the capacitor C4; the parallel binary configurable capacitor and the series binary configurable capacitor generate any two effective capacitance values by controlling the on and off of the radio frequency switches S3 and S4.
Specifically, logic control signals of the phase compensation network and the artificial nonlinear matching network are generated by the radio frequency detection unit and the comparison and judgment unit.
Specifically, the control signal generating and buffering unit is an inverter chain.
Compared with the prior art, the invention has at least the following beneficial effects:
the invention relates to a radio frequency power amplifying circuit based on an artificial nonlinear matching network, which generates an on/off control signal of a radio frequency switch based on a scientifically set logic control strategy, and configures the connection of configurable elements in the artificial nonlinear matching network through the radio frequency switch, so that a radio frequency amplifying tube obtains the optimal load impedance at two or more power points, and the enhancement of the rollback efficiency of a radio frequency power amplifier is realized.
Further, by designing the parallel connection type binary configurable inductor and the series connection type binary configurable inductor in the matching network, the inductive element with the element value configurable by the radio frequency switch is provided for the matching network.
Further, by designing the parallel connection type binary configurable capacitor and the series connection type binary configurable capacitor in the matching network, a capacitive element with an element value configurable by the radio frequency switch is provided for the matching network.
Furthermore, the phase compensation network is arranged in the input matching network, so that the compensation of the phase difference of different configurations of the output matching network can be realized, and the radio frequency power amplifier has good amplitude-phase linearity.
Furthermore, the envelope voltage obtained by detecting the radio frequency input power through the comparison judgment unit is compared with the reference voltage to judge and generate the control signal.
Furthermore, the cross-coupled logic inverter shapes the control signal generated by the comparison and judgment unit to generate a digital control signal with ideal high-low level distinguishing characteristics.
Further, the arrangement of the inverter chain buffer unit is beneficial to reducing the path delay of the control signal.
In summary, the circuit of the invention can realize that the power amplifier transistor obtains the optimal load impedance at two or more power points, and provides a single-branch and large-bandwidth scheme for the design and realization of the radio frequency power amplifying circuit with enhanced backspacing efficiency.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
FIG. 1 is a schematic diagram of an amplifier according to the present invention;
FIG. 2 is a single switch configurable inductor and capacitor based on RF switch control;
FIG. 3 is a pi-type low-pass matching circuit of an artificial nonlinearity;
FIG. 4 is a pi-type low-pass matching circuit of an artificial nonlinearity;
fig. 5 is a phase compensation network of a T-type low pass network.
Wherein: 100. a radio frequency detection unit; 101. a comparison decision unit; 102. a cross-coupled logic inverter; 103. a control signal generating and buffering unit; 104. a radio frequency signal input port; 105. a radio frequency signal output port; 200. a parallel type binary configurable inductor; 201. a series type binary configurable inductor; 202. a parallel binary configurable capacitor; 203. a series type binary configurable capacitor.
Detailed Description
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Various structural schematics according to the disclosed embodiments of the invention are shown in the drawings. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
The invention provides a radio frequency power amplifying circuit based on an artificial nonlinear matching network, which adopts the artificial nonlinear matching network to carry out output matching of a power amplifier; the artificial nonlinear network is a matching network based on a signal processing and network dynamic configuration method, and realizes the characteristic that port impedance and the strength of a radio frequency injection signal are in a nonlinear relation; the connection of elements in the network is reasonably configured through a power detection and logic control radio frequency switch to realize the nonlinear characteristic of the artificial nonlinear matching network, a detection circuit detects an input radio frequency signal to obtain an envelope signal representing the signal power level, the envelope signal generates a logic control signal through the processing result of a comparison judgment circuit, and the logic control signal controls the radio frequency switch to configure the connection of the matching elements.
By properly designing, configuring and controlling the artificial nonlinear matching network, the radio frequency amplifier tube obtains the optimal load impedance at two or more power points, and the backspacing efficiency of the radio frequency power amplifier is enhanced. Wherein the generation of the logic control signal may also be generated based on baseband signal processing.
Referring to fig. 1, an rf power amplifier circuit based on an artificial nonlinear matching network according to the present invention includes an rf detection unit 100, a comparison and decision unit 101, a cross-coupled logic inverter 102, a control signal generation and buffer unit 103, an rf signal input port 104, and an rf signal output port 105.
The radio frequency signal input port 104 is divided into two paths, one path is connected with the input end of the power amplifier transistor through the input matching network IMN and the phase compensation network PCN, and the output end of the power amplifier transistor is connected with the radio frequency signal output port 105 through the artificial nonlinear matching network AN-OMN; the other path of the rf signal input port 104 is connected to the rf detection unit 100; the rf detection unit 100 detects an input rf signal to generate an envelope signal; the comparison decision unit 101 performs comparison decision on the envelope signal and the reference level to generate a digital control signal; the digital control signal improves the noise tolerance through a cross-coupled logic inverter 102 connected with the rear end of a comparison and judgment unit 101; the digital control signal with improved noise tolerance is output through the rf signal output port 105 after the response speed of the control link is increased and the logic adjustment is performed through the control signal generating and buffering unit 103, and the control signal generating and buffering unit 103 is an inverter chain.
The radio frequency detection unit 100 comprises a transistor M8, the input end of the transistor M8 is divided into two paths, one path is connected to a gate bias through a resistor R3, the other path is connected to the radio frequency input end or a radio frequency input coupling end through a capacitor C6, the output end of the transistor M8 is divided into two paths, one path is connected to the decision comparison unit 101, and the other path is connected with a power supply through a filter network formed by connecting a resistor R4 and a capacitor C7 in parallel.
The comparison and decision unit 101 employs a comparator circuit to compare the signal output from the detection unit 100 with the reference signal Vref to generate a decision signal, which is cross-coupled to the logic inverter 102.
The cross-coupled logic inverter 102 includes a plurality of basic cross-coupled logic inverters connected in series, an input terminal of which is connected to the output of the comparison and decision unit 101, and an output terminal of which is connected to the input of the buffer unit 103.
The control signal generation and buffering unit 103 comprises a plurality of inverter chains, the inputs of which are connected to the outputs of the cross-coupled logic inverters 102, each inverter chain being connected to a corresponding radio frequency switch.
Referring to fig. 2, the present invention provides a single-switch configurable inductor and capacitor based on rf switch control, which includes a parallel binary configurable inductor 200, a series binary configurable inductor 201, a parallel binary configurable capacitor 202, and a series binary configurable capacitor 203,
in the parallel binary configurable inductor 200, an inductor L1 and a radio frequency switch S1 are connected in series and then connected in parallel with an inductor L2; in the series binary configurable inductor 201, an inductor L3 is connected in series with a radio frequency switch S2 and an inductor L4 which are connected in parallel; the two structures of the parallel binary configurable inductor 200 and the series binary configurable inductor 201 generate any two effective inductance values by controlling the on and off of the rf switches S1 and S2.
In the parallel binary configurable capacitor 202, a capacitor C1 and a radio frequency switch S3 are connected in series and then are connected in parallel with a capacitor C2; in the series binary configurable capacitor 203, the capacitor C4 is connected in parallel with the radio frequency switch S4 and then connected in series with the capacitor C4; the parallel binary configurable capacitor 202 and the series binary configurable capacitor 203 generate any two effective capacitance values by controlling the on/off of the rf switches S3 and S4.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 3, an artificial nonlinear pi-type low-pass matching circuit is formed based on a parallel single-switch configurable inductor 200 and a parallel single-switch configurable capacitor 202, and an artificial nonlinear output matching network defined based on this structure is configured such that, for different radio frequency signal power levels, under a scientifically set radio frequency switch control strategy, parameter values of each matching element can be configured by on-off control of a radio frequency switch to provide load impedance supporting high-efficiency operation for a power amplifier at different radio frequency powers.
Referring to fig. 4, an artificial nonlinear pi-type low-pass matching circuit is formed based on a series single-switch configurable inductor 201 and a series single-switch configurable capacitor 203, and an artificial nonlinear output matching network defined based on this structure is configured such that, for different radio frequency signal power levels, under a scientifically set radio frequency switch control strategy, parameter values of each matching element can be configured by on-off control of a radio frequency switch to provide load impedance supporting high-efficiency operation for a power amplifier at different radio frequency powers.
Referring to fig. 5, a phase compensation network PCN based on a T-type low-pass network controls the on/off of a radio frequency switch of a logic controller through the PCN to compensate for a phase difference between a saturated working state and a back-off working state of a power amplifier.
Based on the above circuit configuration and description, the network parameters of the artificial nonlinear matching network AN-OMN in fig. 1 dynamically respond to the power of the input signal, so that the load impedance of the power amplifier transistor dynamically changes with the signal power, and the optimal load impedances required by two states are generated respectively when the power amplifier is in saturation operation and a certain back-off point operation through the configuration of the control logic and element parameters of the artificial nonlinear matching network AN-OMN, thereby realizing the improvement of the back-off efficiency and the average efficiency of the power amplifier.
In summary, the rf power amplifier circuit based on the artificial nonlinear matching network of the present invention generates the on/off control signal of the rf switch based on the scientifically configured logic control strategy, and configures the connection of the configurable elements in the artificial nonlinear matching network through the rf switch, so that the rf amplifier tube obtains the optimal load impedance at two or more power points, thereby enhancing the rollback efficiency of the rf power amplifier.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (8)
1. A radio frequency power amplifying circuit based on an artificial nonlinear matching network is characterized by comprising a power amplifier transistor, wherein the input end of the power amplifier transistor is divided into two paths after sequentially passing through an input matching network and a phase compensation network, one path is connected with a radio frequency signal input port (104), the other path is connected with the input end of a radio frequency detection unit (100), and the output end of the power amplifier transistor is connected with a radio frequency signal output port (105) through the artificial nonlinear matching network; the output end of the radio frequency detection unit (100) is sequentially connected with the input end of the control signal generation and buffering unit (103) after passing through the comparison and judgment unit (101) and the cross-coupled logic inverter (102), the output end of the control signal generation and buffering unit (103) is respectively connected with the artificial nonlinear matching network and the phase compensation network, the radio frequency detection unit (100) is used for generating logic control signals of the phase compensation network and the artificial nonlinear matching network after passing through the comparison and judgment unit (101), and the connection of elements in the artificial nonlinear matching network is configured through a radio frequency switch for power detection and logic control.
2. The artificial nonlinear matching network based radio frequency power amplifying circuit according to claim 1, wherein the artificial nonlinear matching network comprises configurable passive elements based on radio frequency switch control, and comprises a parallel type binary configurable inductor (200) and a series type binary configurable inductor (201), the parallel type binary configurable inductor (200) is connected with the radio frequency switch S1, the series type binary configurable inductor (201) is connected with the radio frequency switch S2, and the series type binary configurable inductor (201) and the series type binary configurable inductor (200) generate any two effective inductance values by controlling the on and off of the radio frequency switches S1 and S2.
3. The artificial nonlinear matching network based radio frequency power amplifying circuit according to claim 2, wherein in the parallel binary configurable inductor (200), the inductor L1 and the radio frequency switch S1 are connected in series and then connected in parallel with the inductor L2; in the series binary configurable inductor (201), an inductor L3 is connected in series with a radio frequency switch S2 and an inductor L4 circuit which are connected in parallel.
4. The artificial nonlinear matching network based radio frequency power amplifying circuit according to claim 1, wherein the artificial nonlinear matching network comprises a configurable passive element based on radio frequency switch control, the configurable passive element comprises a parallel type binary configurable capacitor (202) and a series type binary configurable capacitor (203), the parallel type binary configurable capacitor (202) is connected with a radio frequency switch S3, the series type binary configurable capacitor (203) is connected with a radio frequency switch S4, and the parallel type binary configurable capacitor (202) and the series type binary configurable capacitor (203) generate any two effective capacitance values by controlling the on and off of the radio frequency switches S3 and S4.
5. The artificial nonlinear matching network based radio frequency power amplification circuit according to claim 4, characterized in that in the parallel binary configurable capacitor (202), the capacitor C1 and the radio frequency switch S3 are connected in series and then connected in parallel with the capacitor C2; in the series binary configurable capacitor (203), a capacitor C4 is connected in parallel with the radio frequency switch S4 and then connected in series with a capacitor C4.
6. The artificial nonlinear matching network based radio frequency power amplification circuit according to claim 1, wherein the comparison decision unit (101) adopts a comparator circuit, and is used for comparing the signal output by the detection unit (100) with a reference signal Vref to generate a decision signal, and sending the decision signal to the cross-coupled logic inverter (102).
7. The artificial nonlinear matching network based radio frequency power amplification circuit according to claim 1, wherein the cross-coupled logic inverter (102) comprises a plurality of elementary cross-coupled logic inverters, and the plurality of elementary cross-coupled logic inverters are connected in series.
8. The artificial nonlinear matching network based radio frequency power amplifying circuit according to claim 1, wherein the control signal generating and buffering unit (103) is an inverter chain.
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CN116155316A (en) * | 2023-02-27 | 2023-05-23 | 优镓科技(苏州)有限公司 | Radio frequency front end based on G-type power amplifier architecture |
CN116155316B (en) * | 2023-02-27 | 2023-10-17 | 优镓科技(苏州)有限公司 | Radio frequency front end based on G-type power amplifier architecture |
CN117424575A (en) * | 2023-12-18 | 2024-01-19 | 深圳市瀚强科技股份有限公司 | Radio frequency circuit, radio frequency power supply equipment and reactance compensation method |
CN117424575B (en) * | 2023-12-18 | 2024-04-09 | 深圳市瀚强科技股份有限公司 | Radio frequency circuit, radio frequency power supply equipment and reactance compensation method |
CN117459011A (en) * | 2023-12-22 | 2024-01-26 | 深圳市瀚强科技股份有限公司 | Radio frequency circuit, radio frequency power supply equipment and reactance compensation method |
CN117459011B (en) * | 2023-12-22 | 2024-04-09 | 深圳市瀚强科技股份有限公司 | Radio frequency circuit, radio frequency power supply equipment and reactance compensation method |
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