CN106301234B - Doherty power amplifier control method and device - Google Patents
Doherty power amplifier control method and device Download PDFInfo
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- CN106301234B CN106301234B CN201610288699.5A CN201610288699A CN106301234B CN 106301234 B CN106301234 B CN 106301234B CN 201610288699 A CN201610288699 A CN 201610288699A CN 106301234 B CN106301234 B CN 106301234B
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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
- 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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- 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
Abstract
The invention discloses a method and a device for controlling a Doherty power amplifier, wherein the method comprises the following steps: acquiring the output state of a Doherty power amplifier, wherein the Doherty power amplifier comprises a carrier power amplifier and a peak power amplifier; and adjusting the grid voltage of the carrier power amplifier according to the output state of the Doherty power amplifier, so that the carrier power amplifier is switched from a B-type working state to an AB-type working state in the process that the output power of the Doherty power amplifier is reduced from a saturation state to the power corresponding to the back-off quantity of the Doherty power amplifier. According to the output state of the Doherty power amplifier, the grid voltage of the carrier power amplifier is adjusted so as to change the working state of the carrier power amplifier, improve the efficiency of the Doherty power amplifier and ensure the linearity of the Doherty power amplifier.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to a method and a device for controlling a Doherty power amplifier.
Background
Efficiency and linearity are two of the most important indicators of a communication system. Efficiency directly affects the operating cost of the communication system, and linearity determines the quality of the communication. The combination of doherty power amplifier (i.e., doherty power amplifier) and Digital Predistortion (DPD) is a common technique used in modern wireless communication.
The doherty power amplifier adopts an active load modulation technology, and the whole power amplifier can be composed of two parallel power amplifier circuits as shown in figure 1. After entering a Doherty power amplifier, a radio frequency signal is divided into two paths by a power divider 1, wherein one path of the radio frequency signal sequentially passes through a first microstrip line 2, a first input matching network 3, a carrier power amplifier 4, a first output matching network 5 and a lambda/4 microstrip line 6, the other path of the radio frequency signal sequentially passes through a second microstrip line 7, a second input matching network 8, a peak power amplifier 9, a second output matching network 10 and a high-resistance transformation line 11, and after the two paths of power amplifier circuits are connected in parallel, the radio frequency signal is output through a power synthesis microstrip line 12. The carrier power amplifier and the peak power amplifier of the Doherty power amplifier automatically carry out active load traction according to the size of an input signal, so that the load change of two power amplifier tubes is realized, and the efficiency of the Doherty power amplifier in power backspacing is improved. A load modulation schematic diagram of a carrier power amplifier of a doherty power amplifier in the prior art is shown in fig. 2. When the output power of the Doherty power amplifier reaches saturation, a load line of the carrier power amplifier is a load line a, and the carrier power amplifier works in a maximum power state; when the output power of the Doherty power amplifier is reduced, the current of the peak power amplifier is reduced, active load traction is realized on the carrier power amplifier, and the load of the carrier power amplifier is continuously improved; when the output power of the Doherty power amplifier is reduced to the backspacing power, the load line of the carrier power amplifier is shown as a load line b, and the carrier power amplifier works in a high-efficiency state.
However, in order to ensure that the doherty power amplifier has good linearity, in the process of changing the load line of the carrier power amplifier from the load line a to the load line b, the carrier power amplifier in the prior art always works in class AB, and the static working point of the carrier power amplifier is always located at the point Q in fig. 2, so that the thermal power consumption of the carrier power amplifier circuit is large, and the efficiency of the doherty power amplifier is directly reduced.
Disclosure of Invention
In view of this, the present invention provides a method and an apparatus for controlling a doherty power amplifier, so as to improve the efficiency of the doherty power amplifier and ensure the linearity of the doherty power amplifier.
In order to achieve the purpose, the invention adopts the following technical scheme:
in one aspect, an embodiment of the present invention provides a method for controlling a doherty power amplifier, including:
acquiring the output state of a Doherty power amplifier, wherein the Doherty power amplifier comprises a carrier power amplifier and a peak power amplifier;
and adjusting the grid voltage of the carrier power amplifier according to the output state of the Doherty power amplifier, so that the carrier power amplifier is switched from a B-type working state to an AB-type working state in the process that the output power of the Doherty power amplifier is reduced from a saturation state to the power corresponding to the back-off quantity of the Doherty power amplifier.
Further, the obtaining of the output state of the doherty power amplifier includes:
detecting the input signal power of the Doherty power amplifier;
and calculating the output state of the Doherty power amplifier corresponding to the input signal power according to the input signal power and the gain of the Doherty power amplifier.
Further, the detecting the input signal power of the doherty power amplifier comprises:
detecting first signal power output by an input signal through a coupling end of a coupler through a detector;
determining the power of the input signal through a digital signal processing circuit according to the power of the first signal and the coupling degree of the coupler;
correspondingly, after calculating the output state of the doherty power amplifier corresponding to the input signal power, the method further comprises the following steps:
generating a voltage regulation instruction through the digital signal processing circuit according to the output state of the Doherty power amplifier;
correspondingly, according to the output state of the Doherty power amplifier, adjusting the grid voltage of the carrier power amplifier comprises:
and outputting a regulating voltage to the grid of the carrier power amplifier through a grid voltage regulating circuit according to the voltage regulating instruction.
Further, before the input signal is transmitted to the doherty power amplifier through a second signal output by the output end of the coupler, the second signal is subjected to delay processing, so that the adjustment of the grid voltage of the carrier power amplifier and the signal amplification work of the carrier power amplifier are performed synchronously.
Further, the adjusting the gate voltage of the carrier power amplifier according to the output state of the doherty power amplifier includes:
when the Doherty power amplifier works in a saturation state, adjusting the grid voltage of the carrier power amplifier to the starting voltage of the carrier power amplifier so as to enable the carrier power amplifier to work in a B-type working state;
when the output power of the Doherty power amplifier is lower than the saturation power and not lower than the power corresponding to the backspacing of the Doherty power amplifier, the grid voltage of the carrier power amplifier is adjusted, so that the drain current of the carrier power amplifier is increased along with the reduction of the output power of the Doherty power amplifier, and the carrier power amplifier works in an AB type working state.
Further, still include:
and when the output power of the Doherty power amplifier is lower than the power corresponding to the backspacing, keeping the grid voltage of the carrier power amplifier when the grid voltage of the carrier power amplifier is at the power corresponding to the backspacing.
In another aspect, an embodiment of the present invention provides a control device for a doherty power amplifier, including:
the Doherty power amplifier output state acquisition module is used for acquiring the output state of the Doherty power amplifier, and the Doherty power amplifier comprises a carrier power amplifier and a peak power amplifier;
and the grid voltage adjusting module is used for adjusting the grid voltage of the carrier power amplifier according to the output state of the Doherty power amplifier so that the carrier power amplifier is switched from a B-type working state to an AB-type working state in the process that the output power of the Doherty power amplifier is reduced from a saturation state to the power corresponding to the back-off quantity of the Doherty power amplifier.
Further, the Doherty power amplifier output state acquisition module comprises a detector and a digital signal processing circuit, and the grid voltage regulation module comprises a grid voltage regulation circuit;
the detector is used for detecting the first signal power output by the input signal of the Doherty power amplifier through the coupling end of the coupler;
the digital signal processing circuit is used for determining the power of the input signal according to the power of the first signal and the coupling degree of the coupler; calculating the output state of the Doherty power amplifier corresponding to the input signal power according to the input signal power and the gain of the Doherty power amplifier; generating a voltage regulation instruction according to the output state of the Doherty power amplifier;
correspondingly, the grid voltage regulating circuit is used for outputting regulating voltage to the grid of the carrier power amplifier according to the voltage regulating instruction.
And the delay circuit is used for carrying out delay processing on the second signal before the input signal is transmitted to the Doherty power amplifier through the second signal output by the output end of the coupler, so that the adjustment of the grid voltage of the carrier power amplifier and the signal amplification work of the carrier power amplifier are carried out synchronously.
Further, the gate voltage regulating circuit is specifically configured to:
when the Doherty power amplifier works in a saturation state, adjusting the grid voltage of the carrier power amplifier to the starting voltage of the carrier power amplifier so as to enable the carrier power amplifier to work in a B-type working state;
when the output power of the Doherty power amplifier is lower than the saturation power and not lower than the power corresponding to the backspacing of the Doherty power amplifier, the grid voltage of the carrier power amplifier is adjusted, so that the drain current of the carrier power amplifier is increased along with the reduction of the output power of the Doherty power amplifier, and the carrier power amplifier works in an AB type working state.
Further, the gate voltage regulating circuit is further configured to:
and when the output power of the Doherty power amplifier is lower than the power corresponding to the backspacing, keeping the grid voltage of the carrier power amplifier when the grid voltage of the carrier power amplifier is at the power corresponding to the backspacing.
The invention has the beneficial effects that: according to the control method and the device of the Doherty power amplifier, provided by the invention, the grid voltage of the carrier power amplifier is adjusted according to the output state of the Doherty power amplifier, so that the carrier power amplifier is switched from the B-type working state to the AB-type working state in the process that the output power of the Doherty power amplifier is reduced from a saturation state to a backspacing power, and in the whole working process, the current of the static working point of the carrier power amplifier is lower than that of the carrier power amplifier in the prior art, thereby reducing the thermal power consumption of a carrier power amplifier circuit, improving the efficiency of the Doherty power amplifier and simultaneously ensuring the linearity of the Doherty power amplifier.
Drawings
The above and other features and advantages of the present invention will become more apparent to those of ordinary skill in the art by describing in detail exemplary embodiments thereof with reference to the attached drawings, in which:
FIG. 1 is a schematic circuit diagram of a prior Doherty power amplifier;
FIG. 2 is a schematic diagram of the modulation of the carrier power amplifier load of the prior Doherty power amplifier;
fig. 3 is a schematic circuit diagram of a doherty power amplifier and a control device thereof according to an embodiment of the present invention;
fig. 4 is a schematic flow chart of a method for controlling a doherty power amplifier according to an embodiment of the present invention;
fig. 5 is a schematic diagram of load modulation of a carrier power amplifier of a doherty power amplifier according to an embodiment of the present invention;
fig. 6 is a block diagram of a control device of a doherty power amplifier according to a second embodiment of the present invention.
Detailed Description
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
The Doherty power amplifier provided by the invention can be two-way balanced Doherty power amplifiers, two-way unbalanced Doherty power amplifiers, multi-way Doherty power amplifiers or multi-order Doherty power amplifiers. This embodiment takes two doherty power amplifiers as an example for explanation.
Fig. 3 is a schematic circuit diagram of a doherty power amplifier and a control device thereof according to an embodiment of the present invention. As shown in fig. 3, the radio frequency signal is divided into two paths by the coupler 16, one path is output from the output end of the coupler 16 and enters the doherty power amplifier through the delay circuit, and the other path is output through the coupling end of the coupler 16 and sequentially passes through the wave detector 13, the digital signal processing circuit 14 and the gate voltage adjusting circuit to output the adjusting voltage to the gate of the carrier power amplifier 4; in addition, the radio frequency signal entering the doherty power amplifier is divided into two paths by the power divider 1, one path of the radio frequency signal sequentially passes through the first microstrip line 2, the first input matching network 3, the carrier power amplifier 4, the first output matching network 5 and the lambda/4 microstrip line 6, the other path of the radio frequency signal sequentially passes through the second microstrip line 7, the second input matching network 8, the peak power amplifier 9, the second output matching network 10 and the high-resistance transformation line 11, and the two paths of the power amplifier circuits are connected in parallel and then output the radio frequency signal through the power synthesis microstrip line 12.
Fig. 4 is a schematic flow chart of a method for controlling a doherty power amplifier according to an embodiment of the present invention. The method is suitable for the condition of amplifying the radio frequency signal with high efficiency and high quality by adjusting the grid voltage of the carrier power amplifier in the Doherty power amplifier, and can be executed by a control device of the Doherty power amplifier. As shown in fig. 4, the method includes:
Wherein, the output state of the Doherty power amplifier can comprise the output power of the Doherty power amplifier. In this embodiment, the output power of the doherty power amplifier can be obtained through the feedback signal at the output end of the doherty power amplifier, and the output power of the doherty power amplifier can also be determined according to the input signal, and preferably, the output power of the doherty power amplifier is determined according to the input signal, so that the working state of the doherty power amplifier can be controlled before the input signal is amplified.
Illustratively, this step may include:
A. the input signal power of the Doherty power amplifier is detected.
Specifically, referring to fig. 3, an input signal (radio frequency signal) of the doherty power amplifier outputs a first signal to the detector 13 through a coupling end of the coupler 16, and the detector 13 detects a power of the first signal and transmits the detected power of the first signal to the digital signal processing circuit 14; digital signal processing circuit 14 determines the input signal power based on the first signal power and the degree of coupling of coupler 16.
B. According to the input signal power of the Doherty power amplifier and the gain of the Doherty power amplifier, the output state of the Doherty power amplifier corresponding to the input signal power is calculated, and the output state of the Doherty power amplifier corresponding to the detected input signal power is determined.
The gain of the doherty power amplifier is preset in the digital signal processing circuit 14, and after the digital signal processing circuit calculates the input signal power, the output state of the doherty power amplifier corresponding to the detected input signal power is determined by combining the gain of the doherty power amplifier.
Illustratively, the digital signal processing circuit 14 receives the first signal power transmitted by the detector 13, and analyzes the input signal power according to the first signal power; calculating the output state of the Doherty power amplifier corresponding to the input signal power according to the gain of the Doherty power amplifier; and then, generating a voltage regulation and control instruction according to the output state of the Doherty power amplifier, and transmitting the voltage regulation and control instruction to the grid voltage regulating circuit 15 so as to instruct the grid voltage regulating circuit 15 to correspondingly regulate the grid voltage of the carrier power amplifier 4.
And step 102, adjusting the grid voltage of the carrier power amplifier according to the output state of the Doherty power amplifier, so that the carrier power amplifier is switched from the B-type working state to the AB-type working state in the process that the output power of the Doherty power amplifier is reduced from the saturation state to the power corresponding to the back-off quantity of the Doherty power amplifier.
Based on step 101, according to the output state of the doherty power amplifier, adjusting the gate voltage of the carrier power amplifier may include: and outputting the regulated voltage to a grid of the carrier power amplifier according to the voltage regulation instruction.
Specifically, when the doherty power amplifier works in a saturation state, the gate voltage adjusting circuit 15 receives a corresponding voltage adjusting and controlling instruction, outputs an adjusting and controlling voltage to the gate of the carrier power amplifier 4 according to the voltage adjusting and controlling instruction, and adjusts the gate voltage of the carrier power amplifier 4 to be the starting voltage Vgs1 of the carrier power amplifier 4, so that the carrier power amplifier 4 works in the class B working state. At this time, the load line of the carrier power amplifier 4 is as shown by the load line c in fig. 5, the quiescent operating point of the carrier power amplifier 4 is Q1, and the quiescent current Ids1 is 0.
When the output power of the doherty power amplifier is lower than the saturation power and not lower than the power corresponding to the back-off amount, the gate voltage adjusting circuit 15 receives a corresponding voltage regulating instruction. And outputting the regulating voltage to the grid of the carrier power amplifier 4 according to the voltage regulating instruction, and regulating the grid voltage of the carrier power amplifier 4 so that the drain current of the carrier power amplifier 4 is increased along with the reduction of the output power of the Doherty power amplifier, and the carrier power amplifier 4 works in an AB type working state. In the process that the output power of the Doherty power amplifier is reduced to the backspacing power from the saturation state, the load line of the carrier power amplifier 4 is gradually changed from the load line c to the load line d, the static operating point of the carrier power amplifier gradually rises from Q1 to Q2, the drain voltage is kept unchanged, the drain current is continuously improved, and the linearity of the Doherty power amplifier is improved. When the output power of the carrier power amplifier is reduced to the back-off power, the load line of the carrier power amplifier 4 is shown as the load line d in fig. 5, the quiescent operating point of the carrier power amplifier 4 is Q2, the gate voltage is Vgs2, and the quiescent current is Ids 2.
In the scheme, the working state of the carrier power amplifier is changed by adjusting the grid voltage of the carrier power amplifier and controlling the magnitude of the drain current. For example, when the drain current is 0, the carrier amplifier operates in the class B operating state, and when the drain current is greater than 0 and is a current value less than half of the maximum drain current, the carrier amplifier operates in the class AB operating state.
Further, when the output power of the doherty power amplifier is lower than the power corresponding to the back-off amount, at this time, the peak power amplifier 9 stops working, and the gate voltage adjusting circuit 15 maintains the gate voltage of the carrier power amplifier when the gate voltage of the carrier power amplifier is at the power corresponding to the back-off amount. At this time, the load line of the carrier amplifier 4 is still the load line d of fig. 5.
Further, referring to fig. 3, a delay circuit 17 may be further disposed between the coupler 16 and the power divider 1. Therefore, before the input signal is transmitted to the Doherty power amplifier through the second signal output by the output end of the coupler 16, the second signal is subjected to time delay processing, so that the adjustment of the grid voltage of the carrier power amplifier and the signal amplification work of the carrier power amplifier are synchronously carried out.
According to the control method of the Doherty power amplifier provided by the embodiment of the invention, the output state of the Doherty power amplifier is calculated according to the input power of the Doherty power amplifier, the grid voltage of the carrier power amplifier is adjusted, so that the carrier power amplifier is switched from the B-type working state to the AB-type working state in the process that the output power of the Doherty power amplifier is reduced to the power corresponding to the backspacing from the saturation state, and the quiescent current of the carrier power amplifier is lower than that of the carrier power amplifier in the prior art in the whole working process, thereby reducing the thermal power consumption of a carrier power amplifier circuit, improving the efficiency of the Doherty power amplifier and simultaneously ensuring the linearity of the Doherty power amplifier.
Example two
Fig. 6 is a block diagram of a control device of a doherty power amplifier according to a second embodiment of the present invention. As shown in fig. 6, the apparatus includes a doherty power amplifier output state obtaining module 20, a doherty and gate voltage adjusting module 30.
The doherty power amplifier output state detection module 20 is configured to detect an output state of the doherty power amplifier, where the doherty power amplifier includes a carrier power amplifier and a peak power amplifier;
and the grid voltage adjusting module 30 is configured to adjust the grid voltage of the carrier power amplifier according to the output state of the doherty power amplifier, so that the carrier power amplifier is switched from the class B operating state to the class AB operating state in the process that the output power of the doherty power amplifier is reduced from the saturation state to the power corresponding to the back-off amount.
Further, referring to fig. 3, the doherty power amplifier output state obtaining module 20 may include a wave detector 13 and a digital signal processing circuit 14, and the gate voltage adjusting module 30 includes a gate voltage adjusting circuit 15;
the detector 13 is configured to detect a first signal power output by an input signal of the doherty power amplifier through a coupling end of the coupler 16;
the digital signal processing circuit 14 is configured to determine the power of the input signal according to the first signal power and the coupling degree of the coupler 16; calculating the output state of the Doherty power amplifier corresponding to the input signal power according to the input signal power and the gain of the Doherty power amplifier; and generating a voltage regulation and control instruction according to the output state of the Doherty power amplifier.
Correspondingly, the grid voltage regulating circuit 15 is configured to output the regulated voltage to the grid of the carrier power amplifier 4 according to the voltage regulation instruction.
Further, referring to fig. 3, the control device of this embodiment further includes a delay circuit 17, configured to perform delay processing on the second signal before the input signal is transmitted to the doherty power amplifier through the second signal output by the output end of the coupler 16, so that the adjustment of the gate voltage of the carrier power amplifier 4 is performed synchronously with the signal amplification operation of the carrier power amplifier 4.
Preferably, the gate voltage adjusting circuit 15 is specifically configured to:
when the Doherty power amplifier works in a saturation state, adjusting the grid voltage of the carrier power amplifier to the starting voltage of the carrier power amplifier so as to enable the carrier power amplifier to work in a B-type working state;
when the output power of the Doherty power amplifier is lower than the saturation power and not lower than the power corresponding to the backspacing, the grid voltage of the carrier power amplifier is adjusted, so that the drain current of the carrier power amplifier is increased along with the reduction of the output power of the Doherty power amplifier, and the carrier power amplifier works in an AB working state.
Further, the gate voltage adjusting circuit 15 is further configured to:
and when the output power of the Doherty power amplifier is lower than the power corresponding to the backspacing, keeping the grid voltage of the carrier power amplifier when the grid voltage of the carrier power amplifier is at the power corresponding to the backspacing of the Doherty power amplifier.
Further, the doherty power amplifier in the embodiment may be two balanced doherty power amplifiers, two unbalanced doherty power amplifiers, multiple doherty power amplifiers or multi-order doherty power amplifiers.
The control device of the doherty power amplifier provided by the embodiment of the invention and the control method of the doherty power amplifier provided by the embodiment of the invention belong to the same inventive concept, can execute the control method of the doherty power amplifier provided by the embodiment of the invention, and have corresponding functions and beneficial effects. For details of the doherty power amplifier, which are not described in detail in this embodiment, reference may be made to a method for controlling a doherty power amplifier provided in an embodiment of the present invention.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (7)
1. A method for controlling a Doherty power amplifier is characterized by comprising the following steps:
acquiring the output state of a Doherty power amplifier, wherein the Doherty power amplifier comprises a carrier power amplifier and a peak power amplifier;
according to the output state of the Doherty power amplifier, adjusting the grid voltage of the carrier power amplifier so that the carrier power amplifier is switched from a B-type working state to an AB-type working state in the process that the output power of the Doherty power amplifier is reduced from a saturation state to the power corresponding to the back-off quantity of the Doherty power amplifier;
the adjusting the grid voltage of the carrier power amplifier according to the output state of the Doherty power amplifier comprises:
when the Doherty power amplifier works in a saturation state, the grid voltage regulating circuit receives a corresponding voltage regulating instruction, outputs a regulating voltage to the grid of the carrier power amplifier according to the voltage regulating instruction, and regulates the grid voltage of the carrier power amplifier to be a starting voltage of the carrier power amplifier so that the carrier power amplifier works in a B-type working state;
when the output power of the Doherty power amplifier is lower than the saturation power and not lower than the power corresponding to the backspacing of the Doherty power amplifier, a grid voltage regulating circuit receives a corresponding voltage regulating and controlling instruction, outputs a regulating and controlling voltage to a grid of the carrier power amplifier according to the voltage regulating and controlling instruction, and regulates the grid voltage of the carrier power amplifier so that the drain current of the carrier power amplifier is increased along with the reduction of the output power of the Doherty power amplifier, and the carrier power amplifier works in an AB type working state;
when the output power of the Doherty power amplifier is lower than the power corresponding to the backset, the grid voltage regulating circuit keeps the grid voltage of the carrier power amplifier when the grid voltage of the carrier power amplifier is at the power corresponding to the backset.
2. The method of claim 1, wherein obtaining the output state of the Doherty power amplifier comprises:
detecting the input signal power of the Doherty power amplifier;
and calculating the output state of the Doherty power amplifier corresponding to the input signal power according to the input signal power and the gain of the Doherty power amplifier.
3. The method of claim 2, wherein the detecting the input signal power of the doherty power amplifier comprises:
detecting first signal power output by an input signal through a coupling end of a coupler through a detector;
determining the power of the input signal through a digital signal processing circuit according to the power of the first signal and the coupling degree of the coupler;
correspondingly, after calculating the output state of the doherty power amplifier corresponding to the input signal power, the method further comprises the following steps:
generating a voltage regulation instruction through the digital signal processing circuit according to the output state of the Doherty power amplifier;
correspondingly, according to the output state of the Doherty power amplifier, adjusting the grid voltage of the carrier power amplifier comprises:
and outputting a regulating voltage to the grid of the carrier power amplifier through a grid voltage regulating circuit according to the voltage regulating instruction.
4. The method of claim 3, wherein the second signal outputted from the output terminal of the coupler is delayed before being transmitted to the Doherty power amplifier, so that the adjustment of the gate voltage of the carrier power amplifier is synchronized with the signal amplification of the carrier power amplifier.
5. A control device of Doherty power amplifier is characterized by comprising:
the Doherty power amplifier output state acquisition module is used for acquiring the output state of the Doherty power amplifier, and the Doherty power amplifier comprises a carrier power amplifier and a peak power amplifier;
the grid voltage adjusting module is used for adjusting the grid voltage of the carrier power amplifier according to the output state of the Doherty power amplifier so that the carrier power amplifier is switched from a B-type working state to an AB-type working state in the process that the output power of the Doherty power amplifier is reduced from a saturation state to the power corresponding to the back-off quantity of the Doherty power amplifier;
the gate voltage adjusting module comprises a gate voltage adjusting circuit, and the gate voltage adjusting circuit is specifically configured to:
when the Doherty power amplifier works in a saturation state, adjusting the grid voltage of the carrier power amplifier to the starting voltage of the carrier power amplifier so as to enable the carrier power amplifier to work in a B-type working state;
when the output power of the Doherty power amplifier is lower than saturated power and not lower than power corresponding to backspacing, adjusting the grid voltage of the carrier power amplifier so that the drain current of the carrier power amplifier is increased along with the reduction of the output power of the Doherty power amplifier, and the carrier power amplifier works in an AB type working state;
and when the output power of the Doherty power amplifier is lower than the power corresponding to the backspacing, keeping the grid voltage of the carrier power amplifier when the grid voltage of the carrier power amplifier is at the power corresponding to the backspacing of the Doherty power amplifier.
6. The apparatus of claim 5, wherein the Doherty power amplifier output state obtaining module comprises a detector and a digital signal processing circuit, and the gate voltage adjusting module comprises a gate voltage adjusting circuit;
the detector is used for detecting the first signal power output by the input signal of the Doherty power amplifier through the coupling end of the coupler;
the digital signal processing circuit is used for determining the power of the input signal according to the power of the first signal and the coupling degree of the coupler; calculating the output state of the Doherty power amplifier corresponding to the input signal power according to the input signal power and the gain of the Doherty power amplifier; generating a voltage regulation instruction according to the output state of the Doherty power amplifier;
correspondingly, the grid voltage regulating circuit is used for outputting regulating voltage to the grid of the carrier power amplifier according to the voltage regulating instruction.
7. The apparatus of claim 6, further comprising a delay circuit configured to delay the second signal before the second signal outputted from the output terminal of the coupler is transmitted to the Doherty power amplifier, so that the adjustment of the gate voltage of the carrier power amplifier is performed synchronously with the signal amplification of the carrier power amplifier.
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| CN100546176C (en) * | 2006-03-08 | 2009-09-30 | 华为技术有限公司 | Power amplification device |
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2016
- 2016-05-04 CN CN201610288699.5A patent/CN106301234B/en active Active
Non-Patent Citations (1)
| Title |
|---|
| 基于双向牵引技术的反向Doherty 功率放大器设计;南敬昌等;《激光杂志》;20140831;第35卷(第8期);全文 * |
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