CN117595796A - Load mismatch resistant high-linearity Doherty power amplifier and control method - Google Patents
Load mismatch resistant high-linearity Doherty power amplifier and control method Download PDFInfo
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- H—ELECTRICITY
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- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
- H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
- H03F1/0288—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers using a main and one or several auxiliary peaking amplifiers whereby the load is connected to the main amplifier using an impedance inverter, e.g. Doherty amplifiers
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Abstract
The invention belongs to the technical field of microwave power amplifiers, and discloses a load mismatch resistant high-linearity Doherty power amplifier and a control method thereof, wherein a load impedance monitoring module, an inverse load change module, a main power amplifier linearity detection module and a voltage control module are introduced; meanwhile, the input matching network and the output matching network of the power divider and the auxiliary power amplifier branch are replaced by an adjustable power divider, an adjustable input matching network and an adjustable output matching network which are controlled by a voltage control module; according to the invention, the influence of load mismatch on the whole power amplifier is reduced by adding the inverse load change module at the output end of the Doherty power amplifier; the power distribution and auxiliary power amplification branches of the Doherty power amplifier are adjusted by monitoring the linear characteristics of the main power amplifier, and an additional circuit is not needed, so that the Doherty power amplifier can adaptively adjust the self linearity; provides theoretical basis and design thought for multi-channel and multi-beam emission scheme.
Description
Technical Field
The invention belongs to the technical field of microwave power amplifiers, and particularly relates to a load mismatch resistant high-linearity Doherty power amplifier and a control method thereof.
Background
Currently, with further increases in data rate, frequency band number, and link channel, wireless communication is continuously evolving along the directions of high speed, diversification and array, and the mutual influence of each transmitting link in the mimo system is gradually aggravated. The multi-channel and multi-beam transmission mode has an inherent advantage in power synthesis and redistribution, but its poor robustness results in power leakage between adjacent channels. From a single link, this effect can be considered as load mismatch, so that the power amplifier of the link cannot work in a normal state, and the output power and efficiency of the link are affected, and finally the synthesis effect of the whole multiple input multiple output system is affected.
In addition, higher order modulated signals increase the spectral utilization of the communication system at the cost of increasing the signal peak-to-average ratio, which means that the power amplifier in the base station needs to operate in a back-off power state for a long time. The Doherty power amplifier architecture has the advantages of higher rollback efficiency, low complexity, high reliability and the like, is one of the most extensive power amplifier structures in base station application, but has serious nonlinear distortion problem under the excitation of broadband signals. The interference between adjacent channels of the mimo system further exacerbates this nonlinear distortion. Therefore, the research on how the Doherty power amplifier resists the load mismatch under the condition of the load mismatch is carried out, so that the high efficiency and the high linearity state of the system are maintained, and the Doherty power amplifier has high value.
Conventional Doherty power amplifiers are widely used in wireless communication systems, and are known for their high efficiency and good linearity. However, there are also some technical problems with this conventional Doherty power amplifier, as follows:
technical problems existing in the prior art:
1. sensitivity to load mismatch:
conventional Doherty power amplifiers are sensitive to load impedance variations. When the load impedance changes, the working state of the amplifier is affected, and the performance and efficiency of the amplifier are reduced.
2. Limited adaptation capability:
the performance of a conventional Doherty power amplifier may vary under different operating conditions, such as different frequencies, ambient temperatures, or input power levels. They lack an efficient adaptive mechanism to adjust their performance.
3. Balance of linearity and efficiency:
in conventional Doherty designs, a compromise between high efficiency and high linearity is often required. In some application scenarios, this compromise results in performance inefficiency.
4. Complex designs and adjustments:
the conventional Doherty power amplifier design is relatively complex, requiring a fine matching network design. In practical applications, it is difficult to adjust these parameters to accommodate different operating conditions.
The proposal is improved relative to the prior art:
the proposal of the high-linearity Doherty power amplifier with load mismatch resistance aims at solving the problems in the prior art by integrating a load impedance monitoring module, an inverse load change module, a main power amplifier linearity detection module, a voltage control module and an adjustable matching network. The specific improvement comprises:
enhancing the adaptability to load changes: the load impedance monitoring module and the inverse load change module enable the amplifier to dynamically adapt to the change of the load impedance, so that the stability and the efficiency of the amplifier are improved.
Improving the adaptability of the system: the adjustable matching network and voltage control module allow the amplifier to be automatically adjusted under different operating conditions to optimize its performance.
Improving the balance of linearity and efficiency: through the main power amplifier linearity detection module and the voltage control module, the amplifier can better realize balance between high efficiency and high linearity.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention provides a high-linearity Doherty power amplifier resistant to load mismatch and a control method.
The invention is realized in such a way that the load mismatch resistant high-linearity Doherty power amplifier is provided with a load impedance monitoring module, an inverse load change module, a main power amplifier linearity detecting module and a voltage control module; meanwhile, the input matching network and the output matching network of the power divider and the auxiliary power amplifier branch are replaced by an adjustable power divider, an adjustable input matching network and an adjustable output matching network which are controlled by a voltage control module;
the load impedance detection module is arranged in front of the radio frequency output port and is used for monitoring the load change condition of the radio frequency output port;
the inverse load change module is arranged between the synthesizer and the radio frequency output and regulated and controlled by the load impedance detection module, and performs impedance inversion process aiming at different load changes;
the main power amplifier linearity detection module detects nonlinear characteristics of an output signal of the main power amplifier output matching network;
the voltage control module is used for adjusting grid power supply and second drain power supply of the second auxiliary power amplifier aiming at nonlinear characteristics of the main power amplifier by the main power amplifier linearity detection module, and controlling the network structures of the adjustable power divider, the adjustable input matching network and the adjustable output matching network through voltage.
Further, the output end of the input matching network is connected with the grid electrode of the first transistor; the first grid bias network provides proper bias voltage for the grid of the first transistor, one end of the first grid bias network is connected with the input matching network, and the other end of the first grid bias network is connected with the grid power supply 1;
the output end of the adjustable input matching network is connected with the grid electrode of the second transistor; the second grid bias network provides proper bias voltage for the grid of the second transistor, one end of the second grid bias network is connected with the adjustable input matching network, and the other end of the second grid bias network is connected with the second grid for supplying power;
the source electrode of the first transistor is grounded, the drain electrode of the first transistor is connected with the input end of the output matching network, and the output end of the output matching network is connected with the inverse load change module; the first drain bias network provides proper bias voltage for the drain electrode of the first transistor, one end of the first drain bias network is connected with the output matching network, and the other end of the first drain bias network is connected with the first drain electrode for supplying power;
the source electrode of the second transistor is grounded, the drain electrode of the second transistor is connected with the input end of the adjustable output matching network, and the output end of the adjustable output matching network is connected with the reverse load change module; the second drain bias network provides a proper bias voltage for the drain of the second transistor, one end of the second drain bias network is connected with the adjustable output matching network, and the other end of the second drain bias network is connected with the second drain for supplying power.
Further, the load mismatch resistant high linearity Doherty power amplifier further comprises: the power divider comprises an adjustable power divider, an input matching network, a first grid bias network, a first transistor, an output matching network, a first drain bias network, an adjustable input matching network, a second grid bias network, a second transistor, an adjustable output matching network, a second drain bias network, a synthesizer, an inverse load change module, a load impedance detection module, a main power amplifier linearity detection module and a voltage control module;
the input matching network and the output matching network are microstrip transmission lines with different widths respectively and are used for matching the optimal working state of the transistor;
the adjustable power divider, the adjustable input matching network and the adjustable output matching network are provided with voltage-controlled elements besides a microstrip transmission line structure and are regulated and controlled by a voltage control module;
the first grid bias network and the first drain bias network are respectively connected with a first grid voltage and a first drain voltage and provide a static working voltage for the first transistor;
the second grid bias network and the second drain bias network are respectively connected with a second grid voltage and a second drain voltage and provide a static working voltage for the second transistor;
the second gate voltage and the second drain voltage are regulated by the voltage control module.
Another object of the present invention is to provide a microwave power amplifier mounted with the load mismatch resistant high linearity Doherty power amplifier.
Another object of the present invention is to provide a wireless communication control system mounted with the microwave power amplifier.
The invention further aims to provide a control method based on the load mismatch resistant high-linearity Doherty power amplifier, wherein the control method of the load mismatch resistant high-linearity Doherty power amplifier is characterized in that an inverse load change module and a linear adjustment module are introduced into a microwave Doherty power amplifier circuit, and the load impedance is monitored and the inverse load change module is used for controlling the load mismatch resistant high-linearity Doherty power amplifier; dynamically adjusting an auxiliary power amplifier branch based on the change of the main power amplifier, and timely adjusting an input/output matching network of the power divider and the auxiliary power amplifier branch through a voltage control module; the load change of the radio frequency output end is reduced by the inverse load change module and the dynamically adjustable auxiliary power amplifier branch.
Further, the control method of the load mismatch resistant high-linearity Doherty power amplifier specifically comprises the following steps:
different load impedance is set in simulation software to simulate the load mismatch condition of an actual circuit, a load impedance monitoring module is introduced into the circuit to monitor the impedance change of a load end and control an inverse load change module to perform an impedance inversion process aiming at the load change;
introducing a main power amplifier linearity detection module into a circuit, and carrying out nonlinear analysis on an output signal of a main power amplifier branch circuit to obtain nonlinear characteristics of the output signal; aiming at nonlinear change of a main power amplification branch, nonlinear characteristics of an auxiliary power amplification branch are designed to enable the Doherty power amplifier to maintain a high linear state in a backspacing state;
and introducing a voltage control module into a circuit, utilizing the nonlinear characteristics of the obtained auxiliary power amplifier branch, adjusting the grid power supply and the second drain power supply of the second auxiliary power amplifier, controlling the network structures of the adjustable power divider, the adjustable input matching network and the adjustable output matching network through the voltage, and obtaining the final Doherty power amplifier.
Another object of the present invention is to provide a computer device, which includes a memory and a processor, the memory storing a computer program, which when executed by the processor, causes the processor to execute the control method of the load mismatch resistant high linearity Doherty power amplifier.
Another object of the present invention is to provide a computer-readable storage medium storing a computer program, which when executed by a processor, causes the processor to perform the method for controlling the load mismatch resistant high linearity Doherty power amplifier.
The invention further aims to provide an information data processing terminal which is used for realizing the control method of the load mismatch resistant high-linearity Doherty power amplifier.
In combination with the technical scheme and the technical problems to be solved, the technical scheme to be protected has the following advantages and positive effects:
firstly, the inverse load change module and the linear adjustment module are introduced into the microwave Doherty power amplifier circuit, so that on one hand, the influence of the impedance change of the radio frequency output end on the running state of the microwave power amplifier is reduced according to the load impedance monitoring and inverse load change module; on the other hand, the auxiliary power amplifier branch is dynamically adjusted based on the change of the main power amplifier, and the input and output matching networks of the power divider and the auxiliary power amplifier branch are timely adjusted through the voltage control module, so that the whole Doherty power amplifier is ensured to be kept in a high-linearity state, and the running state of the whole Doherty power amplifier is enabled to be more attached to the load impedance after the change, and the Doherty power amplifier is enabled to be kept in a high-efficiency state continuously. The interference of the load change of the radio frequency output end to the microwave Doherty power amplifier is reduced to the greatest extent by the reverse load change module and the dynamic adjustable auxiliary power amplifier branch, so that the microwave Doherty power amplifier can maintain higher output power, efficiency and linear state.
Secondly, the influence of load mismatch on the whole power amplifier is reduced by adding an inverse load change module at the output end of the Doherty power amplifier; by monitoring the linear characteristics of the main power amplifier, the power distribution and auxiliary power amplifier branches of the Doherty power amplifier are adjusted, and an additional circuit is not needed, so that the Doherty power amplifier can adaptively adjust the self linearity. The high-linearity Doherty framework for resisting load mismatch enables the power amplifier to be better kept in a high-efficiency and high-linearity rollback state in a multi-input multi-system, and provides theoretical basis and design thought for multi-channel and multi-beam transmission schemes.
The invention utilizes the load impedance detection module and the inverse load change module to reduce the influence of load mismatch on the whole power amplifier, and increases the robustness of the whole circuit, so that the Doherty power amplifier can still work in a high-efficiency and high-output power state under the condition of load mismatch; the main power amplification performance detection module and the voltage control module are utilized to adjust the power distribution and auxiliary power amplification branches of the Doherty power amplifier, so that the Doherty power amplifier can adaptively adjust the linearity of the whole circuit without additional circuits, the circuit robustness of the high-linearity Doherty framework for resisting load mismatch is further improved, and the efficiency and the linearity performance of the power amplifier in a multi-input multi-system are improved.
Thirdly, whether the technical scheme of the invention solves the technical problems that people want to solve all the time but fail to obtain success all the time is solved:
with further increases in data rates, frequency band numbers, and link channels, wireless communications are evolving along with the directions of high speed, diversification, and arraying, and the interaction of each transmission link in the mimo system is gradually aggravated. The multi-channel and multi-beam transmission mode has an inherent advantage in power synthesis and redistribution, but its poor robustness results in power leakage between adjacent channels. From a single link, this effect can be considered as load mismatch, so that the power amplifier of the link cannot work in a normal state, and the output power and efficiency of the link are affected, and finally the synthesis effect of the whole multiple input multiple output system is affected.
The load mismatch resistant high-linearity Doherty power amplifier and the control method thereof reduce the influence of load mismatch on the whole power amplifier by adding an inverse load change module at the output end of the Doherty power amplifier; by monitoring the linear characteristics of the main power amplifier, the power distribution and auxiliary power amplifier branches of the Doherty power amplifier are adjusted, and an additional circuit is not needed, so that the Doherty power amplifier can adaptively adjust the self linearity. The high-linearity Doherty framework for resisting load mismatch enables the power amplifier to be better kept in a high-efficiency and high-linearity rollback state in a multi-input multi-system, and provides theoretical basis and design thought for multi-channel and multi-beam transmission schemes.
The technical scheme of the invention overcomes the technical bias:
in a mimo system, cases of insufficient synthesis power, narrowing of a transmission angle, and the like during multi-channel synthesis transmission are often summarized as antenna or channel algorithm problems. However, the robustness of the cross of the multi-channel and multi-beam transmission modes does not cause power leakage between adjacent channels, and the passive network has limited adjustment capability for the power leakage, so that a large amount of resources can be consumed additionally by utilizing the algorithm, and the algorithm cannot be used out. The active components are properly introduced into the circuit, so that the problem of power leakage can be effectively solved, the robustness of the whole circuit is improved, and meanwhile, compared with a digital implementation method, the circuit has the advantages of low cost, easiness in implementation and the like.
The invention utilizes the load impedance detection module and the inverse load change module to reduce the influence of load mismatch on the whole power amplifier, and increases the robustness of the whole circuit, so that the Doherty power amplifier can still work in a high-efficiency and high-output power state under the condition of load mismatch; the main power amplification performance detection module and the voltage control module are utilized to adjust the power distribution and auxiliary power amplification branches of the Doherty power amplifier, so that the Doherty power amplifier can adaptively adjust the linearity of the whole circuit without additional circuits, the circuit robustness of the high-linearity Doherty framework for resisting load mismatch is further improved, and the efficiency and the linearity performance of the power amplifier in a multi-input multi-system are improved.
Fourth, compared with the traditional Doherty power amplifier, the scheme of the high-linearity Doherty power amplifier with load mismatch resistance provided by the invention has obvious technical progress in a plurality of aspects:
1. load mismatch tolerance is improved:
by introducing the load impedance monitoring module and the inverse load change module, the novel Doherty power amplifier can effectively cope with the situation of load mismatch. This feature is particularly important for communication systems because it ensures stable operation of the amplifier under various load conditions, thereby improving the reliability of the system.
2. Enhancing the adaptive adjustment capability:
according to the scheme, through the adjustable power divider, the adjustable input matching network and the adjustable output matching network, the amplifier can automatically adjust parameters according to different working conditions, so that the overall performance is optimized. Such adaptation capability is particularly useful in dynamically changing environments.
3. The balance of linearity and efficiency is improved:
through the design of the main power amplifier linearity detection module and the voltage control module, the novel amplifier can more effectively improve the linearity of output signals while keeping high efficiency. This has important implications for improving signal quality and reducing interference.
4. The application range is expanded:
because of the stronger load mismatch tolerance and better adaptive adjustment capability, the Doherty power amplifier can be suitable for a wider application environment, including communication systems requiring high stability and high efficiency.
5. Simplifying system design and maintenance:
despite the addition of new modules and functions, the overall design of the new amplifier is still relatively simplified and easy to integrate and maintain. This reduces the complexity of the system and reduces overall costs.
In summary, the high-linearity Doherty power amplifier resistant to load mismatch has remarkable technical progress, and particularly has remarkable aspects of improving the reliability, the self-adaptability and the performance of the system. These advances make it an ideal choice for adapting to modern communication needs.
Drawings
Fig. 1 is a schematic structural diagram of a high-linearity Doherty power amplifier with load mismatch resistance according to an embodiment of the present invention;
FIG. 2 is a flow chart of a high-linearity Doherty power amplifier with load mismatch resistance and a control method provided by an embodiment of the invention;
FIG. 3 is a schematic diagram of a variation trend of an input voltage waveform according to a second harmonic voltage variation according to an embodiment of the present invention;
FIG. 4 is a diagram of an example active load modulation module with optimal position parameters according to an embodiment of the present invention;
fig. 5 is a block diagram of a high-linearity Doherty power amplifier according to the main power amplifier impedance and phase condition.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The invention provides two specific embodiments of a load mismatch resistant high-linearity Doherty power amplifier and an implementation scheme thereof:
example 1: radio base station application
Target application scenario: in a wireless communication base station, a high-efficiency and high-linearity power amplifier is required to provide stable signal coverage while having a strong adaptability to environmental changes and load fluctuations.
1. Enhanced load impedance monitoring: a high-precision load impedance detection module is arranged in front of a radio frequency output port of a base station so as to monitor load changes under different weather and environmental conditions.
2. And (3) optimizing an inverse load change module: the reverse load change module is designed so that the reverse load change module can carry out rapid and accurate impedance adjustment aiming at different monitored load conditions.
3. Advanced linearity detection and voltage control: and implementing an advanced main power amplifier performance detection module and dynamically adjusting a voltage control module according to the detection result to ensure that excellent linear output can be maintained under various load conditions.
4. Integrating an intelligent control system: an intelligent control system is used for managing the adjustable power divider and the input/output matching network, so that the self-adaption and the optimization performance of the system are ensured.
Example 2: mobile communication device
Target application scenario: in mobile communication devices, such as smart phones or portable wireless devices, a miniaturized and high-performance power amplifier is required to accommodate a dynamically changing operating environment and to improve battery efficiency.
1. And (3) miniaturization design: each module is designed in a miniaturized mode, including a miniaturized load impedance monitoring module and an inverse load change module, so that the overall size is ensured to be suitable for mobile equipment.
2. Low energy consumption voltage control: low power consumption voltage control modules have been developed to reduce power consumption and extend the battery life of the devices.
3. Optimized tunable matching network: the design is efficient and responds quick adjustable input/output matching network, ensures quick adjustment under different operating conditions, improves the quality and stability of signals.
4. Integrating an intelligent algorithm: the intelligent algorithm is utilized to realize main power amplifier performance detection and automatic adjustment, and high-performance output can be still maintained in a variable use environment of the mobile equipment.
The two embodiments provided by the invention respectively aim at different application scenes, and show how the load mismatch resistant high-linearity Doherty power amplifier meets specific requirements through different design and optimization strategies. Example 1 focuses on stability and adaptability in base station applications, while example 2 focuses more on miniaturization and low power consumption in mobile devices.
As shown in fig. 1, the load mismatch resistant high-linearity Doherty power amplifier provided by the embodiment of the invention is introduced with a load impedance monitoring module, an inverse load change module, a main power amplifier linearity detection module and a voltage control module; meanwhile, the input matching network and the output matching network of the power divider and the auxiliary power amplifier branch are replaced by an adjustable power divider, an adjustable input matching network and an adjustable output matching network which are controlled by a voltage control module;
the output end of the input matching network is connected with the grid electrode of the first transistor; the first grid bias network provides proper bias voltage for the grid of the first transistor, one end of the first grid bias network is connected with the input matching network, and the other end of the first grid bias network is connected with the grid power supply 1;
the output end of the adjustable input matching network is connected with the grid electrode of the second transistor; the second grid bias network provides proper bias voltage for the grid of the second transistor, one end of the second grid bias network is connected with the adjustable input matching network, and the other end of the second grid bias network is connected with the second grid for supplying power;
the source electrode of the first transistor is grounded, the drain electrode of the first transistor is connected with the input end of the output matching network, and the output end of the output matching network is connected with the inverse load change module; the first drain bias network provides proper bias voltage for the drain electrode of the first transistor, one end of the first drain bias network is connected with the output matching network, and the other end of the first drain bias network is connected with the first drain electrode for supplying power;
the source electrode of the second transistor is grounded, the drain electrode of the second transistor is connected with the input end of the adjustable output matching network, and the output end of the adjustable output matching network is connected with the reverse load change module; the second drain bias network provides proper bias voltage for the drain electrode of the second transistor, one end of the second drain bias network is connected with the adjustable output matching network, and the other end of the second drain bias network is connected with the second drain electrode for supplying power;
the power amplifier further includes: the device comprises a load impedance monitoring module, an inverse load change module, a main power amplifier linearity detection module and a voltage control module;
the load impedance detection module is arranged in front of the radio frequency output port and is used for monitoring the load change condition of the radio frequency output port;
the inverse load change module is arranged between the synthesizer and the radio frequency output and regulated and controlled by the load impedance detection module, and performs impedance inversion process aiming at different load changes;
the main power amplifier linearity detection module detects nonlinear characteristics of an output signal of the main power amplifier output matching network;
the voltage control module is used for adjusting grid power supply and second drain power supply of the second auxiliary power amplifier aiming at nonlinear characteristics of the main power amplifier by the main power amplifier linearity detection module, and controlling the network structures of the adjustable power divider, the adjustable input matching network and the adjustable output matching network through voltage;
the circuit of the high-linearity Doherty power amplifier resistant to load mismatch is shown in fig. 1, and comprises an adjustable power divider, an input matching network, a first grid bias network, a first transistor, an output matching network, a first drain bias network, an adjustable input matching network, a second grid bias network, a second transistor, an adjustable output matching network, a second drain bias network, a synthesizer, an inverse load change module, a load impedance detection module, a main power amplification detection module and a voltage control module.
The input matching network and the output matching network are microstrip transmission lines with different widths respectively and are used for matching the optimal working state of the transistor;
the adjustable power divider, the adjustable input matching network and the adjustable output matching network are provided with voltage-controlled elements besides a microstrip transmission line structure and are regulated and controlled by a voltage control module;
the first grid bias network and the first drain bias network are respectively connected with a first grid voltage and a first drain voltage and provide a static working voltage for the first transistor;
the second grid bias network and the second drain bias network are respectively connected with a second grid voltage and a second drain voltage and provide a static working voltage for the second transistor;
the second gate voltage and the second drain voltage are regulated by the voltage control module.
As shown in fig. 2, the control method of the load mismatch resistant high-linearity Doherty power amplifier provided by the embodiment of the invention comprises the following steps:
s101: different load impedances are set in simulation software to simulate the load mismatch condition of an actual circuit, a load impedance monitoring module is introduced into the circuit to monitor the impedance change of a load end and control an inverse load change module to perform an impedance inversion process aiming at the load change so as to reduce the change range of the connecting impedance of the tail end of the synthesizer;
s102: and introducing the main power amplifier linearity detection module into a circuit, and carrying out nonlinear analysis on an output signal of the main power amplifier branch circuit to obtain nonlinear characteristics of the output signal. Aiming at nonlinear change of a main power amplification branch, nonlinear characteristics of an auxiliary power amplification branch are designed to enable the Doherty power amplifier to maintain a high linear state in a backspacing state;
s103: the voltage control module is introduced into a circuit, the obtained nonlinear characteristics of the auxiliary power amplifier branch are utilized, grid power supply and second drain power supply of the second auxiliary power amplifier are adjusted, and the network structures of the adjustable power divider, the adjustable input matching network and the adjustable output matching network are controlled through the voltage, so that the performance of the power amplifier is improved, and the final Doherty power amplifier is obtained.
Only about 10% of the electricity of the 5G base station can be emitted, and the rest of the energy consumption is mainly concentrated in three aspects of a radio frequency unit (about 25%), a baseband unit (about 35%) and refrigeration facilities (about 20%) of an air conditioner and the like of the base station. The degradation of drain efficiency in the back-off state can reach 10% only with the impedance mismatch case illustrated in fig. 3, which means an 11% increase in single link power consumption; meanwhile, when the impedance mismatch is serious, the output power is also reduced by 3dB, which means that the transmitting power of the base station is reduced by half, and the normal transmitting requirement of the base station cannot be met. The design method of the high-linearity Doherty power amplifier resistant to load mismatch can increase the robustness of a circuit by introducing an active control system under the condition of not excessively increasing the complexity of the circuit, and meanwhile, the high linearity of the circuit is maintained, and the method has the advantages of low cost, easiness in realization and the like and has a wide application market.
Fig. 3 shows a performance change of the Doherty power amplifier when a load change is simulated in simulation software. When load mismatch occurs, the output power and efficiency performance of the Doherty power amplifier are obviously degraded.
Through simulation analysis, under the condition of load mismatch, the drain impedance of the main power amplifier is greatly deviated from the impedance matching state designed under the 50 omega state no matter in a saturated state or a rollback state. The added load impedance detection module and the inverse load variation module can be used for improving the situation of impedance mismatch, and the specific effect is shown in fig. 4.
Load mismatch affects the drain impedance of the main power amplifier, which also results in the linearity performance of the entire Doherty power amplifier. Fig. 5 shows a block diagram of a high linearity Doherty power amplifier designed with auxiliary power amplifier according to the main power amplifier impedance and phase conditions. By using the added main power amplifier linearity detection module and the voltage control module, according to the detected main power amplifier linearity characteristics, the corresponding structures of the adjustable power divider, the adjustable input matching network and the adjustable output matching network are tuned through the voltage control module, so that the Doherty power amplifier can adaptively adjust the linearity of the whole circuit without additional circuits, and the circuit robustness of the high-linearity Doherty framework for resisting load mismatch is further improved.
In summary, the technical problem solved by the invention is to provide a design method of a high-linearity Doherty power amplifier resistant to load mismatch, which reduces the influence of load mismatch on the whole power amplifier by adding an inverse load change module at the output end of the Doherty power amplifier; by monitoring the linear characteristics of the main power amplifier, the power distribution and auxiliary power amplifier branches of the Doherty power amplifier are adjusted, and an additional circuit is not needed, so that the Doherty power amplifier can adaptively adjust the self linearity. The high-linearity Doherty framework for resisting load mismatch enables the power amplifier to be better kept in a high-efficiency and high-linearity rollback state in a multi-input multi-system, and provides theoretical basis and design thought for multi-channel and multi-beam transmission schemes.
It should be noted that the embodiments of the present invention can be realized in hardware, software, or a combination of software and hardware. The hardware portion may be implemented using dedicated logic; the software portions may be stored in a memory and executed by a suitable instruction execution system, such as a microprocessor or special purpose design hardware. Those of ordinary skill in the art will appreciate that the apparatus and methods described above may be implemented using computer executable instructions and/or embodied in processor control code, such as provided on a carrier medium such as a magnetic disk, CD or DVD-ROM, a programmable memory such as read only memory (firmware), or a data carrier such as an optical or electronic signal carrier. The device of the present invention and its modules may be implemented by hardware circuitry, such as very large scale integrated circuits or gate arrays, semiconductors such as logic chips, transistors, etc., or programmable hardware devices such as field programmable gate arrays, programmable logic devices, etc., as well as software executed by various types of processors, or by a combination of the above hardware circuitry and software, such as firmware.
The foregoing is merely illustrative of specific embodiments of the present invention, and the scope of the invention is not limited thereto, but any modifications, equivalents, improvements and alternatives falling within the spirit and principles of the present invention will be apparent to those skilled in the art within the scope of the present invention.
Claims (10)
1. The high-linearity Doherty power amplifier resistant to load mismatch is characterized in that a load impedance monitoring module, an inverse load change module, a main power amplifier linearity detection module and a voltage control module are arranged; meanwhile, the input matching network and the output matching network of the power divider and the auxiliary power amplifier branch are replaced by an adjustable power divider, an adjustable input matching network and an adjustable output matching network which are controlled by a voltage control module;
the load impedance detection module is arranged in front of the radio frequency output port and is used for monitoring the load change condition of the radio frequency output port;
the inverse load change module is arranged between the synthesizer and the radio frequency output and regulated and controlled by the load impedance detection module, and performs impedance inversion process aiming at different load changes;
the main power amplifier linearity detection module detects nonlinear characteristics of an output signal of the main power amplifier output matching network;
the voltage control module is used for adjusting grid power supply and second drain power supply of the second auxiliary power amplifier aiming at nonlinear characteristics of the main power amplifier by the main power amplifier linearity detection module, and controlling the network structures of the adjustable power divider, the adjustable input matching network and the adjustable output matching network through voltage.
2. The load mismatch resistant high linearity Doherty power amplifier of claim 1, wherein an output of said input matching network is connected to a gate of a first transistor; the first grid bias network provides proper bias voltage for the grid of the first transistor, one end of the first grid bias network is connected with the input matching network, and the other end of the first grid bias network is connected with the grid power supply 1;
the output end of the adjustable input matching network is connected with the grid electrode of the second transistor; the second grid bias network provides proper bias voltage for the grid of the second transistor, one end of the second grid bias network is connected with the adjustable input matching network, and the other end of the second grid bias network is connected with the second grid for supplying power;
the source electrode of the first transistor is grounded, the drain electrode of the first transistor is connected with the input end of the output matching network, and the output end of the output matching network is connected with the inverse load change module; the first drain bias network provides proper bias voltage for the drain electrode of the first transistor, one end of the first drain bias network is connected with the output matching network, and the other end of the first drain bias network is connected with the first drain electrode for supplying power;
the source electrode of the second transistor is grounded, the drain electrode of the second transistor is connected with the input end of the adjustable output matching network, and the output end of the adjustable output matching network is connected with the reverse load change module; the second drain bias network provides a proper bias voltage for the drain of the second transistor, one end of the second drain bias network is connected with the adjustable output matching network, and the other end of the second drain bias network is connected with the second drain for supplying power.
3. The load mismatch resistant high linearity Doherty power amplifier of claim 1, further comprising: the power divider comprises an adjustable power divider, an input matching network, a first grid bias network, a first transistor, an output matching network, a first drain bias network, an adjustable input matching network, a second grid bias network, a second transistor, an adjustable output matching network, a second drain bias network, a synthesizer, an inverse load change module, a load impedance detection module, a main power amplifier linearity detection module and a voltage control module;
the input matching network and the output matching network are microstrip transmission lines with different widths respectively and are used for matching the optimal working state of the transistor;
the adjustable power divider, the adjustable input matching network and the adjustable output matching network are provided with voltage-controlled elements besides a microstrip transmission line structure and are regulated and controlled by a voltage control module;
the first grid bias network and the first drain bias network are respectively connected with a first grid voltage and a first drain voltage and provide a static working voltage for the first transistor;
the second grid bias network and the second drain bias network are respectively connected with a second grid voltage and a second drain voltage and provide a static working voltage for the second transistor;
the second gate voltage and the second drain voltage are regulated by the voltage control module.
4. A microwave power amplifier, characterized in that the microwave power amplifier is provided with a high linearity Doherty power amplifier resistant to load mismatch as claimed in any of claims 1-3.
5. A wireless communication control system, characterized in that the wireless communication control system is equipped with the microwave power amplifier of claim 4.
6. A control method of the load mismatch resistant high-linearity Doherty power amplifier according to any one of claims 1 to 3, characterized in that the control method of the load mismatch resistant high-linearity Doherty power amplifier is characterized in that an inverse load change module and a linear adjustment module are introduced into a microwave Doherty power amplifier circuit, and the load impedance is monitored and the inverse load change module is used for controlling the load mismatch resistant high-linearity Doherty power amplifier according to load impedance; dynamically adjusting an auxiliary power amplifier branch based on the change of the main power amplifier, and timely adjusting an input/output matching network of the power divider and the auxiliary power amplifier branch through a voltage control module; the load change of the radio frequency output end is reduced by the inverse load change module and the dynamically adjustable auxiliary power amplifier branch.
7. The method for controlling the load mismatch resistant high-linearity Doherty power amplifier of claim 6, wherein the method for controlling the load mismatch resistant high-linearity Doherty power amplifier comprises the following steps:
different load impedance is set in simulation software to simulate the load mismatch condition of an actual circuit, a load impedance monitoring module is introduced into the circuit to monitor the impedance change of a load end and control an inverse load change module to perform an impedance inversion process aiming at the load change;
introducing a main power amplifier linearity detection module into a circuit, and carrying out nonlinear analysis on an output signal of a main power amplifier branch circuit to obtain nonlinear characteristics of the output signal; aiming at nonlinear change of a main power amplification branch, nonlinear characteristics of an auxiliary power amplification branch are designed to enable the Doherty power amplifier to maintain a high linear state in a backspacing state;
and introducing a voltage control module into a circuit, utilizing the nonlinear characteristics of the obtained auxiliary power amplifier branch, adjusting the grid power supply and the second drain power supply of the second auxiliary power amplifier, controlling the network structures of the adjustable power divider, the adjustable input matching network and the adjustable output matching network through the voltage, and obtaining the final Doherty power amplifier.
8. A computer device comprising a memory and a processor, the memory storing a computer program which, when executed by the processor, causes the processor to perform the method of controlling a load mismatch resistant high linearity Doherty power amplifier as defined in claim 6.
9. A computer-readable storage medium storing a computer program which, when executed by a processor, causes the processor to perform the method of controlling a load mismatch resistant high linearity Doherty power amplifier as defined in claim 6.
10. An information data processing terminal, characterized in that the information data processing terminal is configured to implement the control method of the load mismatch resistant high linearity Doherty power amplifier of claim 6.
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