CN110557095A - method and device for improving linear efficiency of power amplifier - Google Patents
method and device for improving linear efficiency of power amplifier Download PDFInfo
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Abstract
The invention discloses a method and a device for improving the linear efficiency of a power amplifier, wherein the method for improving the linear efficiency of the power amplifier comprises the following steps: adjusting the power supply voltage of the power amplifier according to the current power amplifier supply voltage linearly related to the output signal after linearization processing under the current input signal; and performing the linearization processing on the power amplifier. The apparatus for improving the linear efficiency of a power amplifier includes: the envelope tracker is used for adjusting the power supply voltage of the power amplifier according to the current power amplifier supply voltage linearly related to the output signal after linearization processing under the current input signal; a linearizer for performing the linearizing process on the power amplifier. The invention solves the problem that the linearity of the power amplifier is poor due to the improvement of the efficiency of the traditional power amplifier, and improves the efficiency of the power amplifier on the premise of meeting the linearity requirement of the power amplifier.
Description
Technical Field
The embodiment of the invention relates to the technical field of electronics, in particular to a method and a device for improving the linear efficiency of a power amplifier.
background
The power amplifier is an important component in a wireless communication system and is used for amplifying an input signal and outputting the amplified signal, and in the process, the power amplifier converts direct-current energy into radio-frequency energy. The efficiency of the power amplifier can largely determine the efficiency of the whole wireless communication system, and meanwhile, the heat dissipation requirement of the power amplifier can influence the design of the whole wireless communication system. In order to improve the spectrum utilization rate, the existing wireless communication system mostly adopts a modulation signal with high peak-to-average ratio. In order to avoid signal distortion and communication quality degradation, the power amplifier needs to operate in a linear state, and the efficiency of the power amplifier is low. At present, in order to improve the efficiency of a power amplifier on the premise of meeting the system linearity requirement, technologies such as doherty power amplifier combined with Digital Pre-Distortion (DPD) and the like are mostly adopted.
The linearity of the output signal of the doherty power amplifier cannot meet the linearity requirement of the current high peak-to-average ratio signal, and the linearization processing needs to be carried out by adopting linearization means such as digital predistortion and the like. Meanwhile, in order to improve the efficiency of the power amplifier, an envelope tracking technology is generally adopted, and the envelope tracking technology enables the power amplifier to work in a state close to saturation under different input signal amplitudes by enabling the power supply voltage of the power amplifier to change along with the envelope of the input modulation signal. However, the envelope tracking technique will deteriorate the linearity of the output signal, and therefore, it is very worthy to study how to improve the efficiency under the premise of meeting the linearity requirement of the power amplifier.
Disclosure of Invention
In view of the above, the present invention provides a method and an apparatus for improving the linear efficiency of a power amplifier, so as to improve the efficiency of the power amplifier on the premise of meeting the linearity requirement of the 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 improving linear efficiency of a power amplifier, including:
adjusting the power supply voltage of the power amplifier according to the current power amplifier supply voltage linearly related to the output signal after linearization processing under the current input signal;
And performing the linearization processing on the power amplifier.
optionally, adjusting the power supply voltage of the power amplifier according to the current power amplifier supply voltage linearly related to the linearized output signal under the current input signal includes:
Tracking the amplitude of the current input signal;
Searching the current power amplifier power supply voltage corresponding to the amplitude of the current input signal according to the pre-established corresponding relation between the amplitude of the input signal and the power amplifier power supply voltage linearly related to the output signal after linearization processing;
and taking the current power amplifier supply voltage as the power supply voltage of the power amplifier.
optionally, the pre-establishing a corresponding relationship between the input signal amplitude and the power supply voltage of the power amplifier linearly related to the output signal after the linearization process includes:
respectively measuring the peak-to-average ratio of the output signal after the high peak-to-average ratio signal input into the power amplifier under different power supply voltages is amplified under different input signal amplitudes;
Determining a maximum peak-to-average ratio of the peak-to-average ratios correctable by the linearization process;
Determining the lowest power amplifier supply voltage in the power amplifier supply voltages corresponding to the maximum peak-to-average ratio and the corresponding input signal amplitude;
And establishing a corresponding relation between the input signal amplitude and the lowest power amplifier power supply voltage, and storing the corresponding relation in an LUT (look-up table).
optionally, the linearizing the power amplifier includes:
and carrying out linearization processing on the power amplifier according to the current input signal and the current power amplifier output signal of the power amplifier.
optionally, performing linearization processing on the power amplifier according to the current input signal and the current power amplifier output signal of the power amplifier, where the linearization processing includes:
comparing the amplitude and the phase of the current input signal and the amplitude and the phase of the current power amplifier output signal, and performing linearization processing on the current power amplifier input signal input to the power amplifier; alternatively, the first and second electrodes may be,
and comparing the amplitude and the phase of the current input signal and the current power amplifier output signal, and performing linearization processing on the current power amplifier output signal.
In another aspect, an embodiment of the present invention provides an apparatus for improving linear efficiency of a power amplifier, including:
The envelope tracker is used for adjusting the power supply voltage of the power amplifier according to the current power amplifier supply voltage linearly related to the output signal after linearization processing under the current input signal;
a linearizer for performing the linearizing process on the power amplifier.
optionally, the envelope tracker includes an LUT unit, an envelope tracking unit, a control unit, and a power supply, an input end of the envelope tracking unit is connected to the current input signal, output ends of the LUT unit and the envelope tracking unit are connected to an input end of the control unit, an output end of the control unit is connected to a control end of the power supply, and an output end of the power supply is connected to the dc input end of the power amplifier;
Wherein the envelope tracking unit is configured to track an amplitude of the current input signal;
The control unit is used for searching the current power amplifier power supply voltage corresponding to the amplitude of the current input signal according to the corresponding relation between the pre-established input signal amplitude and the power amplifier power supply voltage linearly related to the linearized output signal, and adjusting the power supply voltage output to the power amplifier by the power supply to the current power amplifier power supply voltage;
and the LUT unit is used for storing the corresponding relation between the pre-established input signal amplitude and the power amplifier supply voltage linearly related to the output signal after linearization processing.
optionally, the apparatus further includes a lookup table establishing unit, where the lookup table establishing unit includes:
the peak-to-average ratio measuring subunit is used for measuring the peak-to-average ratio of the output signal after the high peak-to-average ratio signal which is input into the power amplifier under different power supply voltages is amplified respectively under different input signal amplitudes;
A maximum peak-to-average ratio determining subunit configured to determine a maximum peak-to-average ratio among the peak-to-average ratios correctable by the linearization process;
the corresponding relation determining subunit is used for determining the lowest power amplifier supply voltage in the power amplifier supply voltages corresponding to the maximum peak-to-average ratio and the corresponding input signal amplitude;
And the corresponding relation establishing subunit is used for establishing the corresponding relation between the input signal amplitude and the lowest power amplifier power supply voltage, and storing the corresponding relation in the LUT unit to form an LUT table.
Optionally, the system further comprises a first input coupler and an output coupler;
the input end of the first input coupler is connected with the current input signal, the output end of the first input coupler is connected with the input end of the linearizer, the coupling end of the first input coupler is connected with the input end of the envelope tracker, and the output end of the envelope tracker is connected with the direct current input end of the power amplifier;
the input end of the output coupler is connected with the output end of the power amplifier, the coupling end of the output coupler is connected with the reference end of the linearizer, and the output end of the linearizer is connected with the input end of the power amplifier;
the linearizer is used for comparing the amplitude and the phase of the current input signal and the current power amplifier output signal of the power amplifier and carrying out linearization processing on the current power amplifier input signal input to the power amplifier.
optionally, a second input coupler is further included;
the input end of the second input coupler is connected with the current input signal, the output end of the second input coupler is connected with the input end of the power amplifier, the first coupling end of the second input coupler is connected with the input end of the envelope tracker, the output end of the envelope tracker is connected with the direct current input end of the power amplifier, the second coupling end of the second input coupler is connected with the reference end of the linearizer, and the input end of the linearizer is connected with the output end of the power amplifier;
the linearizer is used for comparing the amplitude and the phase of the current input signal and the current power amplifier output signal of the power amplifier and carrying out linearization processing on the current power amplifier output signal.
The invention has the beneficial effects that: according to the method and the device for improving the linear efficiency of the power amplifier, the power supply voltage of the power amplifier is adjusted according to the current power amplifier power supply voltage linearly related to the output signal after linearization processing under the current input signal, so that the power amplifier is enabled to work in a state close to saturation under the current input signal, the efficiency of the power amplifier is improved, the adjusted power supply voltage of the power amplifier is linearly related to the output signal after linearization processing, the linearization processing of the output signal of the power amplifier cannot be influenced, namely the improvement of the efficiency of the power amplifier does not influence the improvement of the linearity of the power amplifier, and the efficiency of the power amplifier is improved on the premise of meeting the linearity requirement of the 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 flow chart of a method for improving the linear efficiency of a power amplifier according to an embodiment of the present invention;
fig. 2 is a block diagram of an apparatus for improving the linear efficiency of a power amplifier according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of another method for improving the linear efficiency of a power amplifier according to an embodiment of the present invention;
Fig. 4 is a block diagram of another apparatus for improving the linear efficiency of a power amplifier according to an embodiment of the present invention;
Fig. 5 is a flow chart illustrating another method for improving the linear efficiency of a power amplifier according to an embodiment of the present invention;
fig. 6 is a block diagram of another apparatus for improving the linear efficiency of a power amplifier according to an 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.
fig. 1 is a schematic flowchart of a method for improving the linear efficiency of a power amplifier according to an embodiment of the present invention. The method can be applied to power amplifiers such as Doherty power amplifiers, balanced power amplifiers, AB power amplifiers and the like, is suitable for the condition of improving the efficiency of the power amplifier on the premise of meeting the linearity requirement of the power amplifier, and can be executed by a device for improving the linearity efficiency of the power amplifier. As shown in fig. 1, the method for improving the linear efficiency of the power amplifier includes:
And step 110, adjusting the power supply voltage of the power amplifier according to the current power amplifier supply voltage linearly related to the output signal after the linearization processing under the current input signal.
the current input signal represents an input signal at any time, and the amplitude of the input signal generally changes in an envelope manner, so that the power supply voltage of the power amplifier needs to be adjusted in real time. Methods of linearization processing include, but are not limited to, digital predistortion, analog predistortion, feed forward and negative feedback, and like linearization techniques.
the existing envelope tracking technology can improve the efficiency of the power amplifier, but the linearity of the output signal is deteriorated. The applicant has found that the root cause is that the power amplifier supply voltage output by the envelope tracking technique affects the linearization process; under a certain input signal, if the power supply voltage of the power amplifier is not related to the linearity of the output signal after linearization processing, the linearity of the output signal is deteriorated; on the contrary, if the power supply voltage of the power amplifier is linearly related to the output signal after linearization processing, the linearization processing of the power amplifier is not affected. Therefore, the step 110 can be understood as performing normal linearization process on the power amplifier when the power supply voltage of the power amplifier is adjusted according to the current power amplifier supply voltage. Optionally, the current power supply voltage of the power amplifier may be a power supply voltage corresponding to a maximum peak-to-average ratio in the high peak-to-average ratio signal amplified by the power amplifier under the current input signal. Preferably, the current power amplifier supply voltage is the lowest power amplifier supply voltage corresponding to the peak-to-average ratio of the high peak-to-average ratio signal amplified by the power amplifier under the current input signal, so as to reduce power consumption.
And step 120, carrying out linearization processing on the power amplifier.
The invention does not limit the linearization processing method, and can realize the linearization of the output signal and the input signal. Based on step 110, it can be understood that, even though the current input signal is the same, the current power amplifier supply voltages obtained by different linearization processing methods may be different, and therefore, a suitable power supply for providing the power supply voltage may be selected according to different linearization processing methods.
according to the method for improving the linear efficiency of the power amplifier, the power supply voltage of the power amplifier can be adjusted according to the current power amplifier supply voltage linearly related to the output signal after linearization processing under the current input signal, so that the power amplifier can work in a state close to saturation under the current input signal, the efficiency of the power amplifier is improved, the adjusted power supply voltage of the power amplifier is linearly related to the output signal after linearization processing, the linearization processing of the output signal of the power amplifier cannot be influenced, namely the improvement of the efficiency of the power amplifier does not influence the improvement of the linearity of the power amplifier, and the efficiency of the power amplifier is improved on the premise of meeting the linearity requirement of the power amplifier.
correspondingly, the embodiment of the invention also provides a device for improving the linear efficiency of the power amplifier, so as to implement the method for improving the linear efficiency of the power amplifier. As shown in fig. 2, the apparatus for improving the linear efficiency of a power amplifier may include an envelope tracker 1 and a linearizer 2;
the envelope tracker 1 is used for adjusting the power supply voltage of the power amplifier 3 according to the current power amplifier supply voltage linearly related to the output signal after linearization processing under the current input signal;
the linearizer 2 is used to linearize the power amplifier 3.
Fig. 2 illustrates the structure of the apparatus for improving the linear efficiency of the power amplifier by way of example only, and does not limit the specific structure and connection relationship of the apparatus.
the apparatus for improving the linear efficiency of a power amplifier provided in this embodiment of the present invention is the same as the method for improving the linear efficiency of a power amplifier provided in any embodiment of the present invention, and can perform the method for improving the linear efficiency of a power amplifier provided in the above embodiment of the present invention, and has corresponding functions and advantageous effects. For the technical details that are not described in detail in this embodiment, reference may be made to the method for improving the linear efficiency of the power amplifier provided in the above-mentioned embodiment of the present invention.
based on the above method for improving the linear efficiency of the power amplifier, optionally, the adjusting the power supply voltage of the power amplifier according to the current power amplifier supply voltage linearly related to the output signal after the linearization processing under the current input signal includes:
Tracking an input signal amplitude of a current input signal;
searching the current power amplifier power supply voltage corresponding to the amplitude of the current input signal according to the corresponding relation between the pre-established input signal amplitude and the power amplifier power supply voltage linearly related to the output signal after linearization processing;
And taking the current power amplifier supply voltage as the power supply voltage of the power amplifier.
Optionally, the linearizing the power amplifier includes:
And carrying out linearization processing on the power amplifier according to the current input signal and the current power amplifier output signal of the power amplifier.
Optionally, the linearizing the power amplifier according to the current input signal and the current power amplifier output signal of the power amplifier includes:
and comparing the amplitude and the phase of the current input signal and the current power amplifier output signal, and performing linearization processing on the current power amplifier input signal input to the power amplifier.
Correspondingly, as shown in fig. 3, the method for improving the linear efficiency of the power amplifier according to the embodiment of the present invention may also include:
Step 210, tracking the amplitude of the current input signal.
Because the amplitude of the input signal is in envelope variation, the amplitude of the current input signal can be tracked and monitored by using an envelope tracker so as to acquire the amplitude of the current input signal in real time.
and step 220, searching the current power amplifier power supply voltage corresponding to the amplitude of the current input signal according to the pre-established corresponding relation between the amplitude of the input signal and the power amplifier power supply voltage linearly related to the output signal after linearization processing.
the corresponding relation between the input signal amplitude and the power supply voltage of the power amplifier linearly related to the output signal after linearization processing can be obtained through statistics of a large amount of measurement data in advance.
exemplarily, the pre-establishing a corresponding relationship between the input signal amplitude and the power supply voltage of the power amplifier linearly related to the output signal after the linearization process may include the following steps:
A. and respectively measuring the peak-to-average ratio of the output signal after the high peak-to-average ratio signal of the input power amplifier is amplified when the input power amplifier is at different power supply voltages under different input signal amplitudes.
since the input signal amplitude determines the input power and the input signal amplitude varies from time to time, the input signal amplitude at a certain time can be simulated by a corresponding constant input power according to the input signal amplitude at each time of the input signal used.
B. The maximum peak-to-average ratio of the peak-to-average ratios correctable by the linearization process is determined.
Wherein, correctability should be understood as normal linearization processing, and linearity of the output signal is good.
C. and determining the lowest power amplifier supply voltage in the power amplifier supply voltages corresponding to the maximum peak-to-average ratio and the corresponding input signal amplitude.
the maximum peak-to-average power ratio can be determined under any input signal amplitude, different input signal amplitudes correspond to different maximum peak-to-average power ratios, one maximum peak-to-average power ratio can correspond to a plurality of power amplifier power supply voltages, and the lowest power amplifier power supply voltage in the plurality of power amplifier power supply voltages can be obtained through comparison.
D. and establishing a corresponding relation between the input signal amplitude and the lowest power amplifier power supply voltage, and storing the corresponding relation in an LUT (look up table).
And step 230, taking the current power amplifier supply voltage as the power supply voltage of the power amplifier.
and 240, comparing the amplitude and the phase of the current input signal and the current power amplifier output signal, and performing linearization processing on the current power amplifier input signal input to the power amplifier.
for example, the current input signal may be pre-distorted by comparing the amplitude and phase difference between the current input signal and the current power amplifier output signal, and the pre-distorted signal (the current power amplifier input signal) may be input to the power amplifier.
Correspondingly, in order to implement the method for improving the linear efficiency of the power amplifier, based on the device for improving the linear efficiency of the power amplifier, the embodiment of the invention also provides another device for improving the linear efficiency of the power amplifier. Specifically, as shown in fig. 4, the envelope tracker 1 provided in this embodiment includes an LUT unit 11, an envelope tracking unit 12, a control unit 13, and a power supply 14, an input end of the envelope tracking unit 12 is connected to a current input signal, output ends of the LUT unit 11 and the envelope tracking unit 12 are connected to an input end of the control unit 13, an output end of the control unit 13 is connected to a control end of the power supply 14, and an output end of the power supply 14 is connected to a dc input end of the power amplifier 3;
Wherein, the envelope tracking unit 12 is used for tracking the amplitude of the current input signal;
The control unit 13 is configured to search a current power amplifier supply voltage corresponding to the amplitude of the current input signal according to a pre-established correspondence between the amplitude of the input signal and a power amplifier supply voltage linearly related to the linearized output signal, and adjust a power supply voltage output by the power supply 14 to the power amplifier 3 to the current power amplifier supply voltage;
The LUT unit 11 is configured to store a correspondence between an input signal amplitude that is established in advance and a power supply voltage of the power amplifier that is linearly related to the output signal after the linearization processing.
Optionally, with continuing reference to fig. 4, based on the foregoing solution, the apparatus for improving the linear efficiency of a power amplifier of the present embodiment further includes a first input coupler 4 and an output coupler 5;
wherein, the input end of the first input coupler 4 is connected with the current input signal, the output end of the first input coupler 4 is connected with the input end of the linearizer 2, the coupling end of the first input coupler 4 is connected with the input end of the envelope tracker 1 (i.e. the input end of the envelope tracking unit 12), and the output end of the envelope tracker (i.e. the output end of the power supply 14) is connected with the direct current input end of the power amplifier 3;
the input end of the output coupler 5 is connected with the output end of the power amplifier 3, the coupling end of the output coupler 5 is connected with the reference end of the linearizer 2, the output end of the linearizer 2 is connected with the input end of the power amplifier 3, and the output end of the output coupler 5 outputs the amplified signal to a load or an antenna;
the linearizer 2 is used for comparing the amplitude and phase of the current input signal and the current power amplifier output signal of the power amplifier 3, and linearizing the current power amplifier input signal input to the power amplifier 3.
In addition, the apparatus for improving the linear efficiency of the power amplifier of the embodiment may further include a lookup table establishing unit, where the lookup table establishing unit includes:
the peak-to-average ratio measuring subunit is used for measuring the peak-to-average ratio of an output signal amplified by a high peak-to-average ratio signal input into the power amplifier under different power supply voltages respectively under different input signal amplitudes;
A maximum peak-to-average ratio determining subunit, configured to determine a maximum peak-to-average ratio among peak-to-average ratios correctable by the linearization processing;
the corresponding relation determining subunit is used for determining the lowest power amplifier supply voltage in the power amplifier supply voltages corresponding to the maximum peak-to-average ratio and the corresponding input signal amplitude;
And the corresponding relation establishing subunit is used for establishing the corresponding relation between the input signal amplitude and the lowest power amplifier power supply voltage, and storing the corresponding relation in the LUT unit to form an LUT table.
It should be noted that the look-up table establishing unit may also be provided separately from the means for improving the linear efficiency of the power amplifier.
In summary, the working process of the apparatus for improving the linear efficiency of the power amplifier in this embodiment is as follows: an input signal is coupled to an envelope tracking unit 12 through a first input end coupler 4, the envelope tracking unit 12 tracks and detects the amplitude of the input signal and sends the amplitude information of the input signal to a control unit 13, the control unit 13 reads an LUT (look up table) in an LUT unit 11, according to the corresponding relation between the amplitude of the input signal in the LUT and the lowest power amplifier supply voltage, the lowest power amplifier supply voltage corresponding to the amplitude of the input signal obtained from the envelope tracking unit 12 is searched, and a power supply 14 is controlled to output the lowest power amplifier supply voltage to a direct current input end of a power amplifier 3; in addition, an input signal is input into the linearizer 2 through the first input end coupler 4, a power amplifier output signal output by the power amplifier 3 is fed back to the linearizer 2 through the output coupler 5, the linearizer 2 linearizes the input signal according to the input signal and the power amplifier output signal, and inputs the linearized signal into the power amplifier 3, and the power amplifier 3 outputs the amplified signal to a load or an antenna through the output coupler 5. Therefore, the efficiency of the power amplifier is improved on the premise of meeting the linearity requirement of the power amplifier.
optionally, based on the foregoing embodiment, performing linearization processing on the power amplifier according to the current input signal and the current power amplifier output signal of the power amplifier, where the linearization processing may also include:
And comparing the amplitude and the phase of the current input signal and the current power amplifier output signal, and performing linearization processing on the current power amplifier output signal.
correspondingly, as shown in fig. 5, the method for improving the linear efficiency of the power amplifier according to the embodiment of the present invention may further include:
Step 310, the amplitude of the current input signal is tracked.
and step 320, searching the current power amplifier power supply voltage corresponding to the amplitude of the current input signal according to the pre-established corresponding relation between the amplitude of the input signal and the power amplifier power supply voltage linearly related to the output signal after linearization processing.
and step 330, taking the current power amplifier supply voltage as the power supply voltage of the power amplifier.
And 340, comparing the amplitude and the phase of the current input signal and the current power amplifier output signal, and performing linearization processing on the current power amplifier output signal.
For example, the current power amplifier output signal may be linearized by comparing the amplitude and phase differences between the current input signal and the current power amplifier output signal, and the linearized signal may be output to a load or an antenna.
It should be noted that, in the method for improving the linear efficiency of the power amplifier according to this embodiment, attention needs to be paid to the timing sequence of the implementation process during the specific implementation process, and the power supply voltage must be adjusted according to the amplitude of the input signal, and then the current power amplifier output signal is linearized according to the current input signal.
Correspondingly, in order to implement the method for improving the linear efficiency of the power amplifier, based on the device for improving the linear efficiency of the power amplifier, the embodiment of the invention also provides another device for improving the linear efficiency of the power amplifier. Specifically, as shown in fig. 6, the envelope tracker 1 provided in this embodiment includes an LUT unit 11, an envelope tracking unit 12, a control unit 13, and a power supply 14, an input end of the envelope tracking unit 12 is connected to a current input signal, output ends of the LUT unit 11 and the envelope tracking unit 12 are connected to an input end of the control unit 13, an output end of the control unit 13 is connected to a control end of the power supply 14, and an output end of the power supply 14 is connected to a dc input end of the power amplifier 3;
Wherein, the envelope tracking unit 12 is used for tracking the amplitude of the current input signal;
The control unit 13 is configured to search a current power amplifier supply voltage corresponding to the amplitude of the current input signal according to a pre-established correspondence between the amplitude of the input signal and a power amplifier supply voltage linearly related to the linearized output signal, and adjust a power supply voltage output by the power supply 14 to the power amplifier 3 to the current power amplifier supply voltage;
The LUT unit 11 is configured to store a correspondence between an input signal amplitude that is established in advance and a power supply voltage of the power amplifier that is linearly related to the output signal after the linearization processing.
Optionally, with continuing reference to fig. 6, based on the foregoing solution, the apparatus for improving the linear efficiency of a power amplifier of the present embodiment further includes a second input coupler 6;
The input end of the second input coupler 6 is connected with the current input signal, the output end of the second input coupler 6 is connected with the input end of the power amplifier 3, the first coupling end of the second input coupler 6 is connected with the input end of the envelope tracker 1 (namely the input end of the envelope tracking unit 12), the output end of the envelope tracker 1 (namely the output end of the power supply 14) is connected with the direct current input end of the power amplifier 3, the second coupling end of the second input coupler 6 is connected with the reference end of the linearizer 2, the input end of the linearizer 2 is connected with the output end of the power amplifier 3, and the output end of the linearizer 2 outputs the linearized signal to a load or an antenna;
The linearizer 2 is used for comparing the amplitude and phase of the current input signal and the current power amplifier output signal of the power amplifier 3, and carrying out linearization processing on the current power amplifier output signal.
in summary, the working process of the apparatus for improving the linear efficiency of the power amplifier in this embodiment is as follows: the input signal is coupled to the envelope tracking unit 12 through the second input end coupler 6, the envelope tracking unit 12 tracks and detects the amplitude of the input signal, and sends the amplitude information of the input signal to the control unit 13, the control unit 13 reads an LUT in the LUT unit 11, according to the corresponding relationship between the amplitude of the input signal in the LUT unit and the lowest power amplifier supply voltage, the lowest power amplifier supply voltage corresponding to the amplitude of the input signal obtained from the envelope tracking unit 12 is searched, and the power supply source 14 is controlled to output the lowest power amplifier supply voltage to the direct current input end of the power amplifier 3; in addition, an input signal is input to the power amplifier 3 through the second input end coupler 6 and is simultaneously coupled to the linearizer 2 through the second input end coupler 6, the power amplifier 3 amplifies the input signal and then inputs an output signal of the power amplifier to the linearizer 2, and the linearizer 2 linearizes the output signal of the power amplifier according to the input signal and the output signal of the power amplifier and outputs the linearized signal to a load or an antenna. Therefore, the efficiency of the power amplifier is improved on the premise of meeting the linearity requirement of the power amplifier.
It should be noted that, the implementation manners of the apparatus for improving the linear efficiency of the power amplifier in any of the above embodiments include, but are not limited to, a chip, a multi-chip module, an amplifier module, a base station, a repeater, and the like. It will be appreciated by those skilled in the art that the above-described implementations are all capable of performing the method of improving the linear efficiency of a power amplifier as proposed by the present invention, and the present invention is not limited to any particular combination of hardware and software.
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 modifications, rearrangements, combinations 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 (10)
1. A method for improving the linear efficiency of a power amplifier, comprising:
adjusting the power supply voltage of the power amplifier according to the current power amplifier supply voltage linearly related to the output signal after linearization processing under the current input signal;
and performing the linearization processing on the power amplifier.
2. the method of claim 1, wherein adjusting the power supply voltage of the power amplifier according to the current power amplifier supply voltage linearly related to the linearized output signal under the current input signal comprises:
tracking the amplitude of the current input signal;
searching the current power amplifier power supply voltage corresponding to the amplitude of the current input signal according to the pre-established corresponding relation between the amplitude of the input signal and the power amplifier power supply voltage linearly related to the output signal after linearization processing;
and taking the current power amplifier supply voltage as the power supply voltage of the power amplifier.
3. the method of claim 2, wherein pre-establishing a correspondence between the amplitude of the input signal and a power supply voltage of the power amplifier linearly related to the linearized output signal comprises:
Respectively measuring the peak-to-average ratio of an output signal after the high peak-to-average ratio signal input into the power amplifier under different power supply voltages under different input signal amplitudes;
Determining a maximum peak-to-average ratio of the peak-to-average ratios correctable by the linearization process;
determining the lowest power amplifier supply voltage in the power amplifier supply voltages corresponding to the maximum peak-to-average ratio and the corresponding input signal amplitude;
and establishing a corresponding relation between the input signal amplitude and the lowest power amplifier power supply voltage, and storing the corresponding relation in an LUT (look-up table).
4. the method of claim 1, wherein the linearizing the power amplifier comprises:
and carrying out linearization processing on the power amplifier according to the current input signal and the current power amplifier output signal of the power amplifier.
5. the method of claim 4, wherein linearizing the power amplifier according to the current input signal and the current power amplifier output signal of the power amplifier comprises:
comparing the amplitude and the phase of the current input signal and the amplitude and the phase of the current power amplifier output signal, and performing linearization processing on the current power amplifier input signal input to the power amplifier; alternatively, the first and second electrodes may be,
And comparing the amplitude and the phase of the current input signal and the current power amplifier output signal, and performing linearization processing on the current power amplifier output signal.
6. An apparatus for improving the linear efficiency of a power amplifier, comprising:
the envelope tracker is used for adjusting the power supply voltage of the power amplifier according to the current power amplifier supply voltage linearly related to the output signal after linearization processing under the current input signal;
A linearizer for performing the linearizing process on the power amplifier.
7. The apparatus of claim 6, wherein the envelope tracker comprises an LUT unit, an envelope tracking unit, a control unit and a power supply, an input of the envelope tracking unit is connected to the current input signal, output terminals of the LUT unit and the envelope tracking unit are connected to an input terminal of the control unit, an output terminal of the control unit is connected to a control terminal of the power supply, and an output terminal of the power supply is connected to the dc input terminal of the power amplifier;
wherein the envelope tracking unit is configured to track an amplitude of the current input signal;
the control unit is used for searching the current power amplifier power supply voltage corresponding to the amplitude of the current input signal according to the corresponding relation between the pre-established input signal amplitude and the power amplifier power supply voltage linearly related to the linearized output signal, and adjusting the power supply voltage output to the power amplifier by the power supply to the current power amplifier power supply voltage;
And the LUT unit is used for storing the corresponding relation between the pre-established input signal amplitude and the power amplifier supply voltage linearly related to the output signal after linearization processing.
8. The apparatus of claim 7, further comprising a look-up table establishing unit, wherein the look-up table establishing unit comprises:
the peak-to-average ratio measuring subunit is used for measuring the peak-to-average ratio of an output signal amplified by a high peak-to-average ratio signal which is input into the power amplifier under different power supply voltages respectively under different input signal amplitudes;
a maximum peak-to-average ratio determining subunit configured to determine a maximum peak-to-average ratio among the peak-to-average ratios correctable by the linearization process;
The corresponding relation determining subunit is used for determining the lowest power amplifier supply voltage in the power amplifier supply voltages corresponding to the maximum peak-to-average ratio and the corresponding input signal amplitude;
And the corresponding relation establishing subunit is used for establishing the corresponding relation between the input signal amplitude and the lowest power amplifier power supply voltage, and storing the corresponding relation in the LUT unit to form an LUT table.
9. the apparatus for improving the linear efficiency of a power amplifier according to claim 6, further comprising a first input coupler and an output coupler;
The input end of the first input coupler is connected with the current input signal, the output end of the first input coupler is connected with the input end of the linearizer, the coupling end of the first input coupler is connected with the input end of the envelope tracker, and the output end of the envelope tracker is connected with the direct current input end of the power amplifier;
The input end of the output coupler is connected with the output end of the power amplifier, the coupling end of the output coupler is connected with the reference end of the linearizer, and the output end of the linearizer is connected with the input end of the power amplifier;
The linearizer is used for comparing the amplitude and the phase of the current input signal and the current power amplifier output signal of the power amplifier and carrying out linearization processing on the current power amplifier input signal input to the power amplifier.
10. The apparatus for improving the linear efficiency of a power amplifier according to claim 6, further comprising a second input coupler;
the input end of the second input coupler is connected with the current input signal, the output end of the second input coupler is connected with the input end of the power amplifier, the first coupling end of the second input coupler is connected with the input end of the envelope tracker, the output end of the envelope tracker is connected with the direct current input end of the power amplifier, the second coupling end of the second input coupler is connected with the reference end of the linearizer, and the input end of the linearizer is connected with the output end of the power amplifier;
the linearizer is used for comparing the amplitude and the phase of the current input signal and the current power amplifier output signal of the power amplifier and carrying out linearization processing on the current power amplifier output signal.
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