CN113746432A - Power amplifier and back-off efficiency improvement control method thereof - Google Patents
Power amplifier and back-off efficiency improvement control method thereof Download PDFInfo
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- CN113746432A CN113746432A CN202010458807.5A CN202010458807A CN113746432A CN 113746432 A CN113746432 A CN 113746432A CN 202010458807 A CN202010458807 A CN 202010458807A CN 113746432 A CN113746432 A CN 113746432A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- 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
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/32—Modifications of amplifiers to reduce non-linear distortion
- H03F1/3205—Modifications of amplifiers to reduce non-linear distortion in field-effect transistor amplifiers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/56—Modifications of input or output impedances, not otherwise provided for
- H03F1/565—Modifications of input or output impedances, not otherwise provided for using inductive elements
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/24—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages
- H03F3/245—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages with semiconductor devices only
Abstract
The application discloses a power amplifier and a back-off efficiency improvement control method thereof, wherein the power amplifier comprises: the main circuit power amplifier, the auxiliary circuit power amplifier and the reconfigurable matching network; the reconfigurable matching network is connected with the output ends of the main circuit power amplifier and the auxiliary circuit power amplifier; the main circuit power amplifier and the auxiliary circuit power amplifier can be composed of a digital power amplifier or an analog power amplifier; the reconfigurable matching network is used for improving the output impedance when the power amplifier is in power backoff, and further improving the backoff efficiency of the power amplifier. By adopting the power amplifier or the back-off efficiency improvement control method thereof, the problems that the output signal of the power amplifier is burred due to power supply switching and the linearity of the power amplifier can be reduced due to the power supply modulation effect are solved, and the deep back-off efficiency of the power amplifier can be effectively improved by adopting the technology disclosed by the application.
Description
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a power amplifier and a back-off efficiency improvement control method thereof.
Background
In the field of wireless communication, a Power Amplifier (PA) generates new frequency components due to nonlinear distortion, and the new frequency components may cause direct interference to a transmitted signal and even interfere with signals of other channels, so that the PA is linearized. Generally, the power back-off is adopted to improve the linearity of the power amplifier, but the power back-off causes the efficiency of the power amplifier to be reduced. Therefore, in order to improve the efficiency of the power amplifier, the overall efficiency of the power amplifier within a certain power back-off region, i.e., the back-off efficiency, needs to be improved.
The widely used Doherty power amplifier is a structure capable of effectively improving the back-off efficiency of the power amplifier. The Doherty power amplifier is mainly composed of a main circuit PA and a sub-circuit PA, and the main circuit PA and the sub-circuit PA are generally the same in size. Initially, the main road PA is opened, and the auxiliary road PA is closed; when the output power of the main circuit PA is maximum, the first peak efficiency is reached, and the output impedance of the main circuit PA is 2Ropt. Then, the auxiliary circuit PA is turned on, and the output impedance of the main circuit PA is reduced and the output power is further increased by the active load traction technology. When the main circuit PA and the auxiliary circuit PA reach the saturated output power, the second peak efficiency is reached, and the output impedances of the main circuit PA and the auxiliary circuit PA are both RoptAnd the output power effect is increased by 6dB for the first peak efficiency point. The first peak efficiency point is generally referred to as: the PA output power is backed off by 6dB peak efficiency. However, the conventional Doherty power amplifier can only achieve two efficiency peak points of saturated power and power back-off of 6dB, and cannot meet the requirements of wireless communication at present.
In order to solve the above problems, in the prior art, a power amplifier using power supply modulation is disclosed, which reduces the supply voltage of the power amplifier by power supply modulation, reduces the output power, and further improves the back-off efficiency. As shown in FIG. 1, a in FIG. 1When the power supply is in saturation output power, the power supply of the main circuit PA and the auxiliary circuit PA are both VDDOutput current is ImaxThe output resistance is RoptWhen the output efficiency of the power amplifier is maximum; b diagram is relative to the working state when the saturated output power is backed off by 6dB, and the power supply of the main circuit PA power supply is still VDDOutput current is Imax2, all the auxiliary circuits PA are closed, and the output resistance is 2RoptThe output efficiency is equal to the output efficiency at the saturated output power; c diagram is also the main PA and the auxiliary PA power supply are reduced to V relative to the working state when the saturated output power is backed off by 6dBDDThe output currents of the main circuit PA and the auxiliary circuit PA are Imax/2, output resistance RoptThe two states of the b diagram and the c diagram are theoretically equal in output power, both have a 6dB backspacing relative to the saturated output power, and the output efficiency is also the same. In the diagram, the main circuit PA supplies power to VDD/2, output current is I max2, all the auxiliary circuits PA are closed, and the output resistance is 2RoptThe output efficiency is equal to that at the saturated output power by a back-off of 12dB with respect to the saturated output power.
However, in the course of research of the present application, the inventors found that in the prior art, when power supply modulation is adopted, power supply switching may cause glitch of the output signal of the power amplifier, and the power supply modulation effect may reduce the linearity of the power amplifier.
Disclosure of Invention
The application provides a power amplifier and a back-off efficiency improvement control method thereof, which are used for solving the problems that in the prior art, when power supply modulation is adopted, the output signal of the power amplifier is burred due to power supply switching, and the linearity of the power amplifier can be reduced due to the power supply modulation effect.
In a first aspect, an embodiment of the present application provides a power amplifier, including: the main circuit power amplifier, the auxiliary circuit power amplifier and the reconfigurable matching network;
the reconfigurable matching network is connected with the output ends of the main circuit power amplifier and the auxiliary circuit power amplifier;
the main circuit power amplifier and the auxiliary circuit power amplifier are composed of digital power amplifiers or analog power amplifiers;
the reconfigurable matching network is used for improving output impedance when the power amplifier is in power backoff, and further improving the backoff efficiency of the power amplifier.
With reference to the first aspect, in one implementation manner, the main power amplifier and the auxiliary power amplifier are both provided with two paths, and the input of the two paths is an I/Q carrier signal.
With reference to the first aspect, in an implementation manner, the main power amplifier and the auxiliary power amplifier are respectively one path, and an input of the main power amplifier and the auxiliary power amplifier is a phase modulation signal or a radio frequency modulation signal.
With reference to the first aspect, in one implementation manner, the reconfigurable matching network includes a reconfigurable transformer and a plurality of switched capacitors;
the plurality of switched capacitors are respectively arranged between the reconfigurable transformer and the main circuit power amplifier and between the reconfigurable transformer and the auxiliary circuit power amplifier;
the reconfigurable transformer is provided with a main coil, a main coil coupling inductor, a secondary coil coupling inductor and a plurality of adjustable capacitors, the main coil of the reconfigurable transformer is connected with the output ends of the main circuit power amplifier and the auxiliary circuit power amplifier, and the adjustable capacitors are respectively connected with the main coil coupling inductor and the secondary coil coupling inductor in series.
In a second aspect, an embodiment of the present application provides a method for controlling back-off efficiency of a power amplifier, where the method is applied to a quadrature digital power amplifier, and the power amplifier includes: the main circuit power amplifier, the auxiliary circuit power amplifier and the reconfigurable matching network, the output ends of the main circuit power amplifier and the auxiliary circuit power amplifier are both connected to the reconfigurable matching network, the main circuit power amplifier and the auxiliary circuit power amplifier are in an orthogonal architecture, the input of the main circuit power amplifier and the input of the auxiliary circuit power amplifier are I/Q carrier signals, the main circuit power amplifier is in two paths, and the main circuit power amplifier comprises: the power amplifier comprises an I path main circuit power amplifier and a Q path main circuit power amplifier; the auxiliary power amplifier comprises two paths, including: an I-path auxiliary power amplifier and a Q-path auxiliary power amplifier;
the control method comprises the following steps:
1) in the direction I (45 degrees, 135 degrees, 225 degrees and 315 degrees), the main power amplifier and the auxiliary power amplifier keep the paths I and Q simultaneously turned on and output currents are equal;
when the power amplifier power back-off is 0dB, all main circuit power amplifiers and all auxiliary circuit power amplifiers are turned on, and the output currents of the main circuit power amplifiers and the auxiliary circuit power amplifiers are all
The output impedance of the power amplifier is Ropt；
When the power amplifier power back-off is 6dB, all main circuit power amplifiers are turned on, all auxiliary circuit power amplifiers are turned off, the reconfigurable matching network carries out self-reconfiguration, and the output current of the main circuit power amplifier is enabled to be 6dB
The optimal output impedance of the power amplifier is 2Ropt；
When the power amplifier power back-off is 6dB, the main circuit power amplifier and the auxiliary circuit power amplifier are both partially opened, and the reconfigurable matching network is reconfigured in a self-proceeding mode, so that the output currents of the main circuit power amplifier and the auxiliary circuit power amplifier are reduced and are both
The optimal output impedance of the power amplifier is 4Ropt；
When the power amplifier power back-off is 12dB, a part of main circuit power amplifiers are turned on, the auxiliary circuit power amplifiers are turned off, the reconfigurable matching network is reconfigured in a self-proceeding mode, and the output current of the main circuit power amplifier is made to be 12dB
The output impedance of the power amplifier is 8Ropt；
2) In the direction II (the directions of 0 degree, 90 degree, 180 degree and 270 degree), the paths I and Q of the main power amplifier and the auxiliary power amplifier are not opened at the same time;
when the power amplifier power back-off is 3dB, all I path main circuit power amplifiers and all I path auxiliary circuit power amplifiers are turned on, or all Q path main circuit power amplifiers and all Q path auxiliary circuit power amplifiers are turned on, the reconfigurable matching network carries out reconfiguration in a self-proceeding mode, so that the output currents of the main circuit power amplifiers and the auxiliary circuit power amplifiers are ImaxThe output impedance of the power amplifier is Ropt；
When the power amplifier power back-off is 9dB, all I path main circuit power amplifiers or all Q path main circuit power amplifiers are turned on, the auxiliary circuit power amplifiers are turned off, the reconfigurable matching network carries out self-reconfiguration, and the output current of the main circuit power amplifier is 1/2ImaxThe output impedance of the power amplifier is 2Ropt；
When the power amplifier power back-off is 9dB, a part of I path main circuit power amplifier and a part of I path auxiliary circuit power amplifier are turned on, or a part of Q path main circuit power amplifier and a part of Q path auxiliary circuit power amplifier are turned on, the reconfigurable matching network is reconfigured by self, so that the output currents of the main circuit power amplifier and the auxiliary circuit power amplifier are 1/4ImaxThe output impedance of the power amplifier is 4Ropt；
When the power amplifier power back-off is 15dB, a part of I path main circuit power amplifier or a part of Q path main circuit power amplifier is turned on, a sub-path power amplifier is turned off, the reconfigurable matching network carries out self-reconfiguration, and the output current of the main circuit power amplifier is 1/8ImaxThe output impedance of the power amplifier is 8Ropt。
In a third aspect, an embodiment of the present application provides a method for controlling back-off efficiency of a power amplifier, where the method is applied to a digital power amplifier, and the power amplifier includes: the main circuit power amplifier and the auxiliary circuit power amplifier are of a polarized architecture, the input of the main circuit power amplifier and the input of the auxiliary circuit power amplifier are both phase modulation signals, and the main circuit power amplifier and the auxiliary circuit power amplifier are respectively one circuit;
the control method comprises the following steps:
when the power amplifier power back-off is 0dB, all the main circuit power amplifier and the auxiliary circuit power amplifier are turned on, and the output currents of the main circuit power amplifier and the auxiliary circuit power amplifier are ImaxThe output impedance of the power amplifier is Ropt；
When the power amplifier power back-off is 6dB, all main circuit power amplifiers are turned on, all auxiliary circuit power amplifiers are turned off, the reconfigurable matching network is reconfigured by self, so that the output current of the main circuit power amplifier and the auxiliary circuit power amplifier is 1/2ImaxThe output impedance of the power amplifier is 2Ropt；
When the power amplifier power back-off is 6dB, the main circuit power amplifier and the auxiliary circuit power amplifier are both partially opened, the reconfigurable matching network is reconfigured by self, so that the output currents of the main circuit power amplifier and the auxiliary circuit power amplifier are both 1/4ImaxThe output impedance of the power amplifier is 4Ropt；
When the power amplifier power back-off is 12dB, a part of main circuit power amplifiers are turned on, all the auxiliary circuit power amplifiers are turned off, the reconfigurable matching network is reconfigured by self, and the output current of the main circuit power amplifier is 1/8ImaxThe output impedance of the power amplifier is 8Ropt。
In a fourth aspect, an embodiment of the present application provides a method for controlling back-off efficiency improvement of a power amplifier, where the method is applied to a power amplifier, and the power amplifier includes: the main circuit power amplifier and the auxiliary circuit power amplifier are of analog architectures, the input of the main circuit power amplifier and the input of the auxiliary circuit power amplifier are both radio frequency modulation signals, and the main circuit power amplifier and the auxiliary circuit power amplifier are respectively one circuit;
the control method comprises the following steps:
when the power amplifier power back-off is 0dB, a main circuit power amplifier and a secondary circuit power amplifier are turned on, and the output currents of the main circuit power amplifier and the secondary circuit power amplifier are ImaxThe output impedance of the power amplifier is Ropt；
When the power amplifier power back-off is 6dB, the main circuit power amplifier is turned on, the auxiliary circuit power amplifier is turned off, the reconfigurable matching network is reconfigured by self, so that the output current of the main circuit power amplifier is 1/2ImaxThe output impedance of the power amplifier is 2Ropt；
At power amplifier power back-off of 6dB, the total output current of the main circuit power amplifier and the auxiliary circuit power amplifier is reduced to 1/4ImaxThe reconfigurable matching network carries out self-reconfiguration so that the output impedance of the power amplifier is 4Ropt；
When the power amplifier power back-off is 12dB, the output current of the main circuit power amplifier is 1/8ImaxThe reconfigurable matching network carries out self-reconfiguration so that the output impedance of the power amplifier is 8Ropt。
With reference to the second, third, or fourth aspect, in an implementation manner, the self-reconfiguration of the reconfigurable matching network includes:
the reconfigurable matching network changes the impedance of the reconfigurable transformer by changing the inductance values of the primary coil and the secondary coil of the reconfigurable transformer, and meanwhile, the reconfigurable matching network conducts fine tuning by using the adjustable capacitor to conduct reconfiguration.
The application discloses a power amplifier and a back-off efficiency improvement control method thereof, wherein the power amplifier comprises: the main circuit power amplifier, the auxiliary circuit power amplifier and the reconfigurable matching network; the reconfigurable matching network is connected with the output ends of the main circuit power amplifier and the auxiliary circuit power amplifier; the main circuit power amplifier and the auxiliary circuit power amplifier are composed of digital power amplifiers or analog power amplifiers; the reconfigurable matching network is used for improving output impedance when the power amplifier is in power backoff, and further improving the backoff efficiency of the power amplifier. When the power amplifier backs down, the reconfigurable matching network is reconfigured to obtain the output impedance matched with the current power of the power amplifier, and then the back-down efficiency of the power amplifier is improved.
By adopting the power amplifier or the backspacing efficiency improvement control method thereof, technologies such as power supply switching and PA output short-circuit switch are not adopted, the problems that burrs appear on output signals of the power amplifier due to power supply switching and the linearity of the power amplifier can be reduced due to a power supply modulation effect are avoided, the impedance during deep backspacing can be improved by adopting the technology disclosed by the application, and the deep backspacing efficiency of the power amplifier is effectively improved.
Furthermore, the influence brought by the parasitic effect when an MOS tube in the digital power amplifier is closed is considered, the performance deterioration of the power amplifier when the power amplifier is deeply backed off is reduced, the adjustable capacitance is reduced when the parasitic capacitance is increased, the total parasitic capacitance and the adjustable capacitance value are kept unchanged, and the influence brought by the increase of the parasitic capacitance can be offset.
Furthermore, the scheme disclosed by the application can realize the efficiency improvement of multiple back-off points of the same power amplifier under different frequencies, and the performance of the power amplifier under different frequencies is optimized by adopting the reconfigurable matching network, so that the working bandwidth of the power amplifier is improved.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a prior art power amplifier employing power supply modulation;
fig. 2 is a power amplifier provided in an embodiment of the present application;
fig. 3 is a power amplifier when the main circuit power amplifier and the auxiliary circuit power amplifier are both two circuits in the embodiment of the present application;
fig. 4 is a power amplifier when both the main circuit power amplifier and the auxiliary circuit power amplifier are one circuit in the embodiment of the present application;
fig. 5 shows a structure of a power amplifier and a method for controlling back-off efficiency improvement of the power amplifier according to a first embodiment of the present application;
fig. 6 is a circuit configuration diagram of a power amplifier in the first embodiment in the embodiment of the present application;
fig. 7 shows a structure of a power amplifier and a method for controlling back-off efficiency improvement of the power amplifier according to a second embodiment of the present application;
fig. 8 is a diagram of a structure of a power amplifier and a method for controlling back-off efficiency improvement of the power amplifier disclosed in a third embodiment of the present application;
fig. 9 is a test result diagram of the power amplifier disclosed in the first embodiment in the embodiment of the present application.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, the present application is described in further detail with reference to the accompanying drawings and the detailed description.
The application provides a power amplifier and a back-off efficiency improvement control method thereof, which are used for solving the problems that in the prior art, when power supply modulation is adopted, the output signal of the power amplifier is burred due to power supply switching, and the linearity of the power amplifier can be reduced due to the power supply modulation effect.
To simplify the description of the embodiments, in the following embodiments, the main path power amplifier is abbreviated as: the main circuit PA and the auxiliary circuit power amplifier are abbreviated as follows: the auxiliary PA, the digital power amplifier, is abbreviated as: DPA (Doherty Power Amplifier).
Referring to fig. 2, an embodiment of the present application provides a power amplifier, including: a main power amplifier (main PA in fig. 2), a secondary power amplifier (secondary PA in fig. 2), and a Reconfigurable Matching Network (RMN).
The reconfigurable matching network is connected with the output ends of the main circuit power amplifier and the auxiliary circuit power amplifier.
The main circuit power amplifier and the auxiliary circuit power amplifier are composed of digital power amplifiers or analog power amplifiers.
The reconfigurable matching network includes a reconfigurable transformer (also referred to as a tunable transformer) and a plurality of switched capacitors.
The plurality of switched capacitors are respectively arranged between the reconfigurable transformer and the main circuit power amplifier and between the reconfigurable transformer and the auxiliary circuit power amplifier; the reconfigurable transformer is provided with a main coil, a main coil coupling inductor, a secondary coil coupling inductor and a plurality of adjustable capacitors, the main coil of the reconfigurable transformer is connected with the output ends of the main circuit power amplifier and the auxiliary circuit power amplifier, and the adjustable capacitors are respectively connected with the main coil coupling inductor and the secondary coil coupling inductor in series.
The reconfigurable matching network is used for improving output impedance when the power amplifier is in power backoff, and further improving the backoff efficiency of the power amplifier.
Optionally, as shown in fig. 3, the main power amplifier and the auxiliary power amplifier are both two paths, and each of the two paths includes an I path and a Q path, and an input of the I path and the Q path is an I/Q carrier signal, that is, the I path inputs the I carrier signal, and the Q path inputs the Q carrier signal.
Optionally, as shown in fig. 4, the main power amplifier and the auxiliary power amplifier are each a single power amplifier, and the input of the single power amplifier is a phase modulation signal or a radio frequency modulation signal.
In fig. 4, 4a is a structural diagram of a power amplifier in which a main circuit PA and a sub-circuit PA are input with phase modulation signals PM, in this embodiment, the main circuit PA and the sub-circuit PA may adopt a Digital Power Amplifier (DPA); and 4b is a structural diagram of a power amplifier in which the inputs of the main PA and the auxiliary PA are both radio frequency modulation signals RF.
By adopting the power amplifier with the structure, the rollback efficiency of the power amplifier is improved through the reconfigurable matching network, namely, different working modes of the reconfigurable matching network are switched at different rollback power points, different impedance matching requirements are met, and further the impedance requirements of different rollback points can be met.
The power amplifier provided by the application does not adopt power supply switching, so that the cost of a power supply hardware circuit is saved on the one hand, and on the other hand, burrs generated by power supply switching can be eliminated, and the linearity of the power amplifier is not influenced.
Furthermore, by using the power amplifier, the efficiency of the multi-back-off point can be improved in a wider frequency range by switching the impedance boosting mode.
Further, with the power amplifier, the influence of the parasitic capacitance can be eliminated by the adjustable capacitance.
The first embodiment of the present application provides a method for controlling back-off efficiency of a power amplifier, where the method is applied to a quadrature digital power amplifier, and the structure of the power amplifier includes: the main circuit power amplifier, the auxiliary circuit power amplifier and the reconfigurable matching network, the output ends of the main circuit power amplifier and the auxiliary circuit power amplifier are both connected to the reconfigurable matching network, the main circuit power amplifier and the auxiliary circuit power amplifier are in an orthogonal architecture, the input of the main circuit power amplifier and the input of the auxiliary circuit power amplifier are I/Q carrier signals, the main circuit power amplifier is in two paths, and the main circuit power amplifier comprises: the power amplifier comprises an I path main circuit power amplifier and a Q path main circuit power amplifier; the auxiliary power amplifier comprises two paths, including: an I-path auxiliary power amplifier and a Q-path auxiliary power amplifier.
The control method comprises the following steps:
1) in the direction I (45 degrees, 135 degrees, 225 degrees and 315 degrees), the main power amplifier and the auxiliary power amplifier keep the paths I and Q simultaneously turned on and output currents are equal;
when the power amplifier power back-off is 0dB, all main circuit power amplifiers and all auxiliary circuit power amplifiers are turned on, and the output currents of the main circuit power amplifiers and the auxiliary circuit power amplifiers are all
The output impedance of the power amplifier is Ropt；
When the power amplifier power back-off is 6dB, all main circuit power amplifiers are turned on, all auxiliary circuit power amplifiers are turned off, the reconfigurable matching network carries out self-reconfiguration, and the output current of the main circuit power amplifier is enabled to be 6dB
The optimal output impedance of the power amplifier is 2Ropt；
When the power amplifier power back-off is 6dB, the main circuit power amplifier and the auxiliary circuit power amplifier are both partially opened, and the reconfigurable matching network is reconfigured in a self-proceeding mode, so that the output currents of the main circuit power amplifier and the auxiliary circuit power amplifier are reduced and are both
The optimal output impedance of the power amplifier is 4Ropt；
When the power amplifier power back-off is 12dB, a part of main circuit power amplifiers are turned on, the auxiliary circuit power amplifiers are turned off, the reconfigurable matching network is reconfigured in a self-proceeding mode, and the output current of the main circuit power amplifier is made to be 12dB
The output impedance of the power amplifier is 8Ropt；
2) In the direction II (the directions of 0 degree, 90 degree, 180 degree and 270 degree), the paths I and Q of the main power amplifier and the auxiliary power amplifier are not opened at the same time;
when the power amplifier power back-off is 3dB, all I path main circuit power amplifiers and all I path auxiliary circuit power amplifiers are turned on, or all Q path main circuit power amplifiers and all Q path auxiliary circuit power amplifiers are turned on, the reconfigurable matching network carries out reconfiguration in a self-proceeding mode, so that the output currents of the main circuit power amplifiers and the auxiliary circuit power amplifiers are ImaxThe output impedance of the power amplifier is Ropt；
When the power amplifier power back-off is 9dB, all I path main circuit power amplifiers or all Q path main circuit power amplifiers are turned on, and the auxiliary circuit power amplifiers are turned offThe reconfigurable matching network performs self-reconfiguration so that the output current of the main circuit power amplifier is 1/2ImaxThe output impedance of the power amplifier is 2Ropt；
When the power amplifier power back-off is 9dB, a part of I path main circuit power amplifier and a part of I path auxiliary circuit power amplifier are turned on, or a part of Q path main circuit power amplifier and a part of Q path auxiliary circuit power amplifier are turned on, the reconfigurable matching network is reconfigured by self, so that the output currents of the main circuit power amplifier and the auxiliary circuit power amplifier are 1/4ImaxThe output impedance of the power amplifier is 4Ropt；
When the power amplifier power back-off is 15dB, a part of I path main circuit power amplifier or a part of Q path main circuit power amplifier is turned on, a sub-path power amplifier is turned off, the reconfigurable matching network carries out self-reconfiguration, and the output current of the main circuit power amplifier is 1/8ImaxThe output impedance of the power amplifier is 8Ropt。
In this embodiment, the main path PA and the auxiliary path PA are controlled by baseband signals, and the specific control circuit is not specifically limited in this application.
Referring to fig. 5, fig. 5 is a structure of a power amplifier and a method for controlling back-off efficiency improvement of the power amplifier according to a first embodiment, where the power amplifier is based on a quadrature I/Q DPA (I/Q digital power amplifier) architecture, an input of the architecture is an I/Q carrier signal, and amplitude modulation of the carrier signal is implemented by an I-path PA and a Q-path PA respectively. The scheme comprises a Main circuit PA (Main PA in the figure, abbreviated as M), wherein the Main circuit PA comprises an I-path Main circuit PA, a Q-path Main circuit PA and a secondary circuit PA (Aux. PA in the figure, abbreviated as A), and the secondary circuit PA comprises an I-path secondary circuit PA, a Q-path secondary circuit PA and a reconfigurable matching network RMN. The output current when the main path PA and the sub path PA are saturated is Imax. In the directions of 45 °, 135 °, 225 °, and 315 ° (direction I), the I-path PA and the Q-path PA are simultaneously turned on and the output signals are equal in magnitude. In the directions of 0 DEG and 180 DEG, only the I path PA is opened, and the Q path PA is closed completely. In the 90 DEG and 270 DEG directions, only the Q-path PA is opened, and the I-path PA is closed completely. In the complex planeThe peak efficiency points in the 45 °, 135 °, 225 °, and 315 ° directions (direction I) are
The peak efficiency points in the 90 °, 180 °, and 270 ° directions (direction II) are
In the direction I, at the point of the efficiency peak, as shown at 5a in FIG. 5
The main path PA and the auxiliary path PA are all opened, and the output power is highest. At this time, the output currents of the I path PA and the Q path PA are Imax. Because the I path signal and the Q path signal are vector-synthesized, the total output circuit of the I path and the Q path is
The optimum impedance point is Ropt. In the range of 0-6dB of output power back-off, the I path PA and the Q path PA of the auxiliary path PA are gradually closed, and the output current is reduced. Reach efficiency peak point
When the main circuit PA is closed, the total output current of the main circuit is
Due to the active load modulation effect of Doherty, the optimum impedance point is increased to 2Ropt. The output power is now reduced by 6dB compared to the saturated output power. At the point of efficiency peak
Both main path PA and auxiliary path PA output
The magnitude of the current (output current of the I path PA and the Q path PA is 1/4I)max) The output power and efficiency thereof are theoretically equivalent to
Same, but the optimum impedance point at this time is increased to 4Ropt. When the output power of the PA is returned within the range of 6-12dB, the I path PA and the Q path PA of the auxiliary path are gradually closed, and the output current is gradually reduced. When reaching the back-off efficiency peak point
When the output power theoretically returns to 12dB, the optimal impedance point is increased to 8Ropt。
The principle of operation of direction II is substantially similar to direction I, as shown at 5b in fig. 5. At the back-off point
Only the I path (or Q path) PA is fully opened, the Q path (or I path) is fully closed, and the output currents of the Main path PA (Main PA in the figure) and the auxiliary path PA (Aux. PA in the figure) are ImaxAt this time, the optimum impedance point is Ropt. The output power of the power amplifier is back-off by 3dB when the I and Q paths are simultaneously on. Within the range of 3-9dB of output power back-off, the I path auxiliary road PA (or the Q path auxiliary road PA) is gradually closed. Reach the back-off point
When the main circuit is in a power-off state, the auxiliary circuit PA is completely closed, and the output current of the main circuit is 1/2Imax. At the moment the output power of the power amplifier is relative to
The point is lowered by 6 dB. Due to the active load modulation effect of Doherty, the optimum impedance point is increased to 2Ropt. At the back-off efficiency peak
The output current of the main circuit PA and the auxiliary circuit PA is 1/4ImaxThe output power of which theoretically corresponds to the back-off point
Equal but the same shapeThe optimal impedance point is 4Ropt. When the output power of the power amplifier is backed off within the range of 9-15dB, the auxiliary circuit PA is gradually closed, and the output current is 1/4ImaxAnd gradually decreases. Reach the back-off efficiency peak point
The output power is theoretically relative to
The point is again lowered by 6dB and the output current is 1/8ImaxThe optimum impedance point is increased to 8Ropt. The light gray main PA or sub-PA in fig. 5a and 5b refers to the main PA or sub-PA being turned off, and 5c in fig. 5 is a graph of the efficiency of the directional I power amplifier as a function of power back-off; 5d in FIG. 5 is a plot of the efficiency of the direction II power amplifier as a function of power back-off, with abscissa PoutThe power amplifier outputs power, and the ordinate Efficiency is the output Efficiency of the power amplifier; 5e in FIG. 5 is a graph of output resistance with power back-off in directions I and II, Class-B in FIGS. 5c and 5d refers to Class B power amplifier, and the deployed PA refers to the power amplifier disclosed in this embodiment; 5e middle abscissa PoutFor the output power of the power amplifier, ordinate RLIs the power amplifier output resistance. In FIG. 5c
Corresponding to four efficiency peaks in 5a, FIG. 5d
Four efficiency peaks in corresponding 5 b.
In this embodiment, the main circuit and the auxiliary circuit DPA (i.e., the maximum output circuits are equal) with the same size are adopted, and in the complex plane, different impedance boosting is realized at different back-off points by using the reconfigurable matching network, so that efficiency boosting under 3/6/9/12/15dB power back-off is realized. Of course, when the main circuit DPA and the auxiliary circuit DPA output currents are different in magnitude, the efficiency improvement of any back-off power point can be realized, and the back-off efficiency is not limited to 3/6/9/12/15dB disclosed in the first embodiment, and the number of back-off efficiency peak points may be more, and the number of back-off efficiency points and the back-off power magnitude may be designed arbitrarily.
To better understand the principle of the first embodiment of the present application, the present application further discloses a basic circuit architecture diagram of the first embodiment, as shown in fig. 6, the power amplifier in fig. 6 mainly comprises a main circuit PA, an auxiliary circuit PA, a reconfigurable matching network, and other baseband digital circuits, the reconfigurable matching network comprises a reconfigurable transformer and a switched capacitor, and the reconfigurable transformer is provided with an adjustable capacitor (C in the figure)P，CS) The adjustable capacitor is respectively connected with the primary coil coupling inductor and the secondary coil coupling inductor in series, the reconfigurable transformer is further provided with a radio frequency output end, the circuit structures of the primary circuit PA and the secondary circuit PA are completely the same (the circuit structures can be different according to requirements in practical application), the primary circuit PA and the secondary circuit PA are both composed of an I circuit PA and a Q circuit PA, and the primary circuit PA and the secondary circuit PA are respectively controlled by 4 baseband signals of 9 bits. The four baseband signals are BBMQ [8:0 ]]、BBMI[8:0]、BBAQ[8:0]、BBAI[8:0]The four baseband signals are input by a serial-to-parallel circuit and then converted into parallel signals, and the parallel signals are converted into control codes for controlling an MSB (high weight) unit and an LSB (low weight) unit after passing through a decoder. Each path of sub PA array is composed of 5-bit MSB and 4-bit LSB units, wherein the MSB units have the same size and are controlled by temperature codes; the LSB unit size is distributed according to binary system, and binary code control is adopted. The carrier signal input by the power amplifier with the quadrature architecture has the frequency of 2LO, and quadrature I/Q signals (LO) with the frequency of LO are generated after passing through a quadrature frequency dividerI+，LOI-，LOQ+，LOQ-) And then output to the MSB and LSB after signal modulation of several generations. The Sign-map mainly realizes the selection of four quadrants of the complex plane, and the specific circuit can adopt the structure in the prior art and is not limited in detail.
The second embodiment of the present application provides a method for controlling back-off efficiency of a power amplifier, where the method is applied to a digital power amplifier, and the power amplifier includes: the main circuit power amplifier and the auxiliary circuit power amplifier are of a polarized architecture, the input of the main circuit power amplifier and the input of the auxiliary circuit power amplifier are both phase modulation signals, and the main circuit power amplifier and the auxiliary circuit power amplifier are respectively one circuit;
the control method comprises the following steps:
when the power amplifier power back-off is 0dB, all the main circuit power amplifier and the auxiliary circuit power amplifier are turned on, and the output currents of the main circuit power amplifier and the auxiliary circuit power amplifier are ImaxThe output impedance of the power amplifier is Ropt；
When the power amplifier power back-off is 6dB, all main circuit power amplifiers are turned on, all auxiliary circuit power amplifiers are turned off, the reconfigurable matching network is reconfigured by self, so that the output current of the main circuit power amplifier and the auxiliary circuit power amplifier is 1/2ImaxThe output impedance of the power amplifier is 2Ropt；
When the power amplifier power back-off is 6dB, the main circuit power amplifier and the auxiliary circuit power amplifier are both partially opened, the reconfigurable matching network is reconfigured by self, so that the output currents of the main circuit power amplifier and the auxiliary circuit power amplifier are both 1/4ImaxThe output impedance of the power amplifier is 4Ropt；
When the power amplifier power back-off is 12dB, a part of main circuit power amplifiers are turned on, all the auxiliary circuit power amplifiers are turned off, the reconfigurable matching network is reconfigured by self, and the output current of the main circuit power amplifier is 1/8ImaxThe output impedance of the power amplifier is 8Ropt。
Referring to fig. 7, fig. 7 is a structure of a power amplifier and a method for controlling back-off efficiency improvement of the power amplifier according to a second embodiment, which is a power amplifier based on a polarization DPA architecture, in the polarization architecture, input signals of a main path PA and a sub path PA are phase modulation signals PM, and then amplitude modulation is implemented by the power amplifier.
In this embodiment, the main path PA and the auxiliary path PA are controlled by baseband signals, and the specific control circuit is not specifically limited in this application. The second embodiment of the present application adopts a circuit structure similar to that of the first embodiment, and can be implemented by using amplifier structures such as class D and class E.
The third embodiment of the present application provides a method for controlling back-off efficiency of a power amplifier, where the method is applied to a power amplifier, and the power amplifier includes: the main circuit power amplifier and the auxiliary circuit power amplifier are of analog architectures, the input of the main circuit power amplifier and the input of the auxiliary circuit power amplifier are both radio frequency modulation signals, and the main circuit power amplifier and the auxiliary circuit power amplifier are respectively one circuit;
the control method comprises the following steps:
when the power amplifier power back-off is 0dB, a main circuit power amplifier and a secondary circuit power amplifier are turned on, and the output currents of the main circuit power amplifier and the secondary circuit power amplifier are ImaxThe output impedance of the power amplifier is Ropt；
When the power amplifier power back-off is 6dB, the main circuit power amplifier is turned on, the auxiliary circuit power amplifier is turned off, the reconfigurable matching network is reconfigured by self, so that the output current of the main circuit power amplifier is 1/2ImaxThe output impedance of the power amplifier is 2Ropt；
At power amplifier power back-off of 6dB, the total output current of the main circuit power amplifier and the auxiliary circuit power amplifier is reduced to 1/4ImaxThe reconfigurable matching network carries out self-reconfiguration so that the output impedance of the power amplifier is 4Ropt；
When the power amplifier power back-off is 12dB, the output current of the main circuit power amplifier is 1/8ImaxThe reconfigurable matching network carries out self-reconfiguration so that the output impedance of the power amplifier is 8Ropt。
Referring to fig. 8, fig. 8 shows a structure of a power amplifier and a method for controlling back-off efficiency improvement of the power amplifier according to a third embodiment, where the power amplifier is based on an analog PA architecture, in the architecture, input signals of a main PA and a sub PA are both modulated signals RF, and the analog PA only amplifies RF signals.
In this embodiment, the main path PA and the auxiliary path PA are controlled by baseband signals, and the specific control circuit is not specifically limited in this application. The circuit structure of the third embodiment of the present application mostly adopts class a, AB, and B amplifiers, and the analog PA only amplifies signals and has no modulation function, so the input of the analog PA architecture is modulated signals.
Further, in the first embodiment, the second embodiment, or the third embodiment, the self-reconfiguration of the reconfigurable matching network includes: the reconfigurable matching network changes the impedance of the reconfigurable transformer by changing the inductance values of the primary coil and the secondary coil of the reconfigurable transformer, and meanwhile, the reconfigurable matching network conducts fine tuning by using the adjustable capacitor to conduct reconfiguration.
By adopting the power amplifier or the backspacing efficiency improvement control method thereof, technologies such as power supply switching and PA output short-circuit switch are not adopted, the problems that burrs appear on output signals of the power amplifier due to power supply switching and the linearity of the power amplifier can be reduced due to a power supply modulation effect are avoided, the impedance during deep backspacing can be improved by adopting the technology disclosed by the application, and the deep backspacing efficiency of the power amplifier is effectively improved.
Parasitic effects such as parasitic capacitance and the like can be brought after the MOS tubes in the DPA are closed, generally, 5bit (31) MOS tubes or even more MOS tubes can be arranged in a sub-array of the DPA, and when more MOS tubes are closed, the parasitic capacitance is increased. When the parasitic capacitance is large, the parasitic capacitance affects the matching circuit, resulting in performance deterioration. The reconfigurable matching network is adopted, so that the influence brought by parasitic capacitance can be offset. When the parasitic capacitance is increased, the adjustable capacitance is adjusted to be small, the total parasitic capacitance and the adjustable capacitance are kept unchanged, and the influence caused by the increase of the parasitic capacitance can be counteracted.
Furthermore, the scheme disclosed by the application can realize the efficiency improvement of multiple back-off points of the same power amplifier under different frequencies, and the performance of the power amplifier under different frequencies is optimized by adopting the reconfigurable matching network, so that the working bandwidth of the power amplifier is improved.
In order to check the beneficial effects of the above embodiments, the present application also discloses that the structure of the first embodiment is used as an example and is tested after being actually processed. The results of the first example Drain Efficiency (DE) tests at 2.8GHz and 3.3GHz are shown in FIG. 9. The abscissa Pout in fig. 9 refers to the power amplifier output power in the present embodiment, and the ordinate DE refers to the drain efficiency. Fig. 9a shows the result of the Drain Efficiency (DE) test at 2.8GHz and 9B shows the result of the Drain Efficiency (DE) test at 3.3GHz, and fig. 9 shows that the drain efficiency is significantly improved compared to the conventional Class B amplifier (Class-B) at 6/12dB and 9/15dB saturation output power backset in both directions I and II.
The circuit of the embodiment is mainly optimized for 3/6/9/12/15dB back-off point in circuit design, and can be optimized for other efficiency back-off points in circuit design, and theoretically, efficiency can be improved at any power back-off point.
The present application has been described in detail with reference to specific embodiments and illustrative examples, but the description is not intended to limit the application. Those skilled in the art will appreciate that various equivalent substitutions, modifications or improvements may be made to the presently disclosed embodiments and implementations thereof without departing from the spirit and scope of the present disclosure, and these fall within the scope of the present disclosure. The protection scope of this application is subject to the appended claims.
Claims (8)
1. A power amplifier, comprising: the main circuit power amplifier, the auxiliary circuit power amplifier and the reconfigurable matching network;
the reconfigurable matching network is connected with the output ends of the main circuit power amplifier and the auxiliary circuit power amplifier;
the main circuit power amplifier and the auxiliary circuit power amplifier can be composed of digital power amplifiers or analog power amplifiers;
the reconfigurable matching network is used for improving output impedance when the power amplifier is in power backoff, and further improving the backoff efficiency of the power amplifier.
2. The power amplifier of claim 1, wherein the main power amplifier and the auxiliary power amplifier are both two-way, and the input is an I/Q carrier signal.
3. The power amplifier of claim 1, wherein the main power amplifier and the auxiliary power amplifier are each a single circuit, and the input of the single circuit is a phase modulation signal or a radio frequency modulation signal.
4. The power amplifier of claim 1, wherein the reconfigurable matching network comprises a reconfigurable transformer and a plurality of switched capacitors;
the plurality of switched capacitors are respectively arranged between the reconfigurable transformer and the main circuit power amplifier and between the reconfigurable transformer and the auxiliary circuit power amplifier;
the reconfigurable transformer is provided with a main coil, a main coil coupling inductor, a secondary coil coupling inductor and a plurality of adjustable capacitors, the main coil of the reconfigurable transformer is connected with the output ends of the main circuit power amplifier and the auxiliary circuit power amplifier, and the adjustable capacitors are respectively connected with the main coil coupling inductor and the secondary coil coupling inductor in series.
5. A power amplifier back-off efficiency improvement control method is applied to a quadrature digital power amplifier, and the power amplifier comprises: the main circuit power amplifier, the auxiliary circuit power amplifier and the reconfigurable matching network, the output ends of the main circuit power amplifier and the auxiliary circuit power amplifier are both connected to the reconfigurable matching network, the main circuit power amplifier and the auxiliary circuit power amplifier are in an orthogonal architecture, the input of the main circuit power amplifier and the input of the auxiliary circuit power amplifier are I/Q carrier signals, the main circuit power amplifier is in two paths, and the main circuit power amplifier comprises: the power amplifier comprises an I path main circuit power amplifier and a Q path main circuit power amplifier; the auxiliary power amplifier comprises two paths, including: an I-path auxiliary power amplifier and a Q-path auxiliary power amplifier;
the control method comprises the following steps:
1) in the direction I, namely in the directions of 45 degrees, 135 degrees, 225 degrees and 315 degrees, the main power amplifier and the auxiliary power amplifier keep the paths I and Q to be simultaneously started and output currents are equal;
when the power amplifier power back-off is 0dB, all main circuit power amplifiers and all auxiliary circuit power amplifiers are turned on, and the output currents of the main circuit power amplifiers and the auxiliary circuit power amplifiers are all
The output impedance of the power amplifier is Ropt；
When the power amplifier power back-off is 6dB, all main circuit power amplifiers are turned on, all auxiliary circuit power amplifiers are turned off, the reconfigurable matching network carries out self-reconfiguration, and the output current of the main circuit power amplifier is enabled to be 6dB
The optimal output impedance of the power amplifier is 2Ropt；
When the power amplifier power back-off is 6dB, the main circuit power amplifier and the auxiliary circuit power amplifier are both partially opened, and the reconfigurable matching network is reconfigured in a self-proceeding mode, so that the output currents of the main circuit power amplifier and the auxiliary circuit power amplifier are reduced and are both
The optimal output impedance of the power amplifier is 4Ropt；
When the power amplifier power back-off is 12dB, a part of main circuit power amplifiers are turned on, the auxiliary circuit power amplifiers are turned off, the reconfigurable matching network is reconfigured in a self-proceeding mode, and the output current of the main circuit power amplifier is made to be 12dB
The output impedance of the power amplifier is 8Ropt；
2) In the direction II, namely in the directions of 0 degrees, 90 degrees, 180 degrees and 270 degrees, the paths I and Q of the main power amplifier and the auxiliary power amplifier are not started at the same time;
when the power amplifier power back-off is 3dB, all I path main circuit power amplifiers and all I path auxiliary circuit power amplifiers are turned on, or all Q path main circuit power amplifiers and all Q path auxiliary circuit power amplifiers are turned on, the reconfigurable matching network carries out reconfiguration in a self-proceeding mode, so that the output currents of the main circuit power amplifiers and the auxiliary circuit power amplifiers are ImaxThe output impedance of the power amplifier is Ropt；
When the power amplifier power back-off is 9dB, all I path main circuit power amplifiers or all Q path main circuit power amplifiers are turned on, the auxiliary circuit power amplifiers are turned off, the reconfigurable matching network carries out self-reconfiguration, and the output current of the main circuit power amplifier is 1/2ImaxThe output impedance of the power amplifier is 2Ropt；
When the power amplifier power back-off is 9dB, a part of I path main circuit power amplifier and a part of I path auxiliary circuit power amplifier are turned on, or a part of Q path main circuit power amplifier and a part of Q path auxiliary circuit power amplifier are turned on, the reconfigurable matching network is reconfigured by self, so that the output currents of the main circuit power amplifier and the auxiliary circuit power amplifier are 1/4ImaxThe output impedance of the power amplifier is 4Ropt；
And when the power amplifier power back-off is 15dB, turning on a part of I path main circuit power amplifier or a part of Q path main circuit power amplifier,turning off the secondary power amplifier, and self-reconstructing the reconfigurable matching network to make the output current of the primary power amplifier 1/8ImaxThe output impedance of the power amplifier is 8Ropt。
6. A power amplifier back-off efficiency improvement control method is applied to a digital power amplifier, and the power amplifier comprises: the main circuit power amplifier and the auxiliary circuit power amplifier are of a polarized architecture, the input of the main circuit power amplifier and the input of the auxiliary circuit power amplifier are both phase modulation signals, and the main circuit power amplifier and the auxiliary circuit power amplifier are respectively one circuit;
the control method comprises the following steps:
when the power amplifier power back-off is 0dB, all the main circuit power amplifier and the auxiliary circuit power amplifier are turned on, and the output currents of the main circuit power amplifier and the auxiliary circuit power amplifier are ImaxThe output impedance of the power amplifier is Ropt；
When the power amplifier power back-off is 6dB, all main circuit power amplifiers are turned on, all auxiliary circuit power amplifiers are turned off, the reconfigurable matching network is reconfigured by self, so that the output current of the main circuit power amplifier and the auxiliary circuit power amplifier is 1/2ImaxThe output impedance of the power amplifier is 2Ropt；
When the power amplifier power back-off is 6dB, the main circuit power amplifier and the auxiliary circuit power amplifier are both partially opened, the reconfigurable matching network is reconfigured by self, so that the output currents of the main circuit power amplifier and the auxiliary circuit power amplifier are both 1/4ImaxThe output impedance of the power amplifier is 4Ropt；
When the power amplifier power back-off is 12dB, a part of main circuit power amplifiers are turned on, all auxiliary circuit power amplifiers are turned off, and the reconfigurable matching network carries out self-reconfiguration so that the main circuit power amplifierThe output current of the amplifier is 1/8ImaxThe output impedance of the power amplifier is 8Ropt。
7. A power amplifier back-off efficiency improvement control method is applied to a power amplifier, and the power amplifier comprises: the main circuit power amplifier and the auxiliary circuit power amplifier are of analog architectures, the input of the main circuit power amplifier and the input of the auxiliary circuit power amplifier are both radio frequency modulation signals, and the main circuit power amplifier and the auxiliary circuit power amplifier are respectively one circuit;
the control method comprises the following steps:
when the power amplifier power back-off is 0dB, a main circuit power amplifier and a secondary circuit power amplifier are turned on, and the output currents of the main circuit power amplifier and the secondary circuit power amplifier are ImaxThe output impedance of the power amplifier is Ropt；
When the power amplifier power back-off is 6dB, the main circuit power amplifier is turned on, the auxiliary circuit power amplifier is turned off, the reconfigurable matching network is reconfigured by self, so that the output current of the main circuit power amplifier is 1/2ImaxThe output impedance of the power amplifier is 2Ropt；
At power amplifier power back-off of 6dB, the total output current of the main circuit power amplifier and the auxiliary circuit power amplifier is reduced to 1/4ImaxThe reconfigurable matching network carries out self-reconfiguration so that the output impedance of the power amplifier is 4Ropt；
When the power amplifier power back-off is 12dB, the output current of the main circuit power amplifier is 1/8ImaxThe reconfigurable matching network carries out self-reconfiguration so that the output impedance of the power amplifier is 8Ropt。
8. The control method according to any one of claims 5, 6 or 7, wherein the reconfigurable matching network self-reconfigures comprising:
the reconfigurable matching network changes the impedance of the reconfigurable transformer by changing the inductance values of the primary coil and the secondary coil of the reconfigurable transformer, and meanwhile, the reconfigurable matching network conducts fine tuning by using the adjustable capacitor to conduct reconfiguration.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015108492A1 (en) * | 2014-01-14 | 2015-07-23 | Aselsan Elektronik Sanayi Ve Ticaret Anonim Sirketi | Doherty amplifier with a wideband in-phase power combiner |
| CN110212879A (en) * | 2019-05-20 | 2019-09-06 | 复旦大学 | The transformers connected in parallel of rollback efficiency enhancing synthesizes power amplifier |
| CN110971195A (en) * | 2019-11-08 | 2020-04-07 | 江苏大学 | Asymmetric Doherty power amplifier adopting parallel auxiliary amplifiers to expand bandwidth |
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2020
- 2020-05-27 CN CN202010458807.5A patent/CN113746432A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015108492A1 (en) * | 2014-01-14 | 2015-07-23 | Aselsan Elektronik Sanayi Ve Ticaret Anonim Sirketi | Doherty amplifier with a wideband in-phase power combiner |
| CN110212879A (en) * | 2019-05-20 | 2019-09-06 | 复旦大学 | The transformers connected in parallel of rollback efficiency enhancing synthesizes power amplifier |
| CN110971195A (en) * | 2019-11-08 | 2020-04-07 | 江苏大学 | Asymmetric Doherty power amplifier adopting parallel auxiliary amplifiers to expand bandwidth |
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