CN114649938A - Method and device for generating reference of radio frequency power amplifier envelope tracking power supply with indefinite step length - Google Patents

Method and device for generating reference of radio frequency power amplifier envelope tracking power supply with indefinite step length Download PDF

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Publication number
CN114649938A
CN114649938A CN202210210424.5A CN202210210424A CN114649938A CN 114649938 A CN114649938 A CN 114649938A CN 202210210424 A CN202210210424 A CN 202210210424A CN 114649938 A CN114649938 A CN 114649938A
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constant reference
radio frequency
power supply
envelope
reference value
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周岩
谢文轩
刘国栋
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Nanjing University of Posts and Telecommunications
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Nanjing University of Posts and Telecommunications
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • 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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/451—Indexing scheme relating to amplifiers the amplifier being a radio frequency amplifier
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/189—High-frequency amplifiers, e.g. radio frequency amplifiers
    • H03F3/19—High-frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only
    • H03F3/195—High-frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only in integrated circuits
    • 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
    • H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
    • H03F3/213—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only in integrated circuits

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)

Abstract

The invention discloses a method and a device for generating an envelope curve tracking power supply reference with an indefinite step length of a radio frequency power amplifier. The method comprises the steps that a key information string is formed by combining each peak value and each valley value in an original radio frequency envelope signal with time points corresponding to each peak value and each valley value, and the key information string corresponds to a preset switch converter in an envelope tracking power supply, and each time zone length corresponding to the key information string is obtained firstly; then based on the obtained lengths of the time zones, obtaining constant reference values corresponding to the lengths of the time zones respectively; finally, based on the obtained lengths of the time zones and the constant reference values corresponding to the lengths of the time zones, a target constant reference value corresponding to the length of the target time zone is finally obtained; and aiming at each target constant reference value, applying a corresponding envelope tracking power supply switching converter to obtain a voltage signal of the envelope tracking power supply. The method greatly reduces the calculated amount of control hardware and effectively improves the radio frequency attack-discharge power supply efficiency of the envelope tracking power supply.

Description

Method and device for generating reference of radio frequency power amplifier envelope tracking power supply with indefinite step length
Technical Field
The invention relates to the field of communication, in particular to a method and a device for generating an indefinite step size reference of a radio frequency power amplifier envelope tracking power supply.
Background
In order to increase the amount of transmitted information in a limited frequency bandwidth, modern communication systems continuously use modulation techniques with higher spectrum utilization to modulate the amplitude, phase, frequency, and the like of a signal, so that the amplitude of an envelope curve of a radio frequency signal is no longer constant and has a higher and higher peak-to-average ratio. The power supply is continuously carried out by adopting the traditional constant envelope mode, and although undistorted transmission of radio frequency signals can be ensured, larger energy loss and low efficiency are caused. At the same time, the lost energy is mostly dissipated in the form of heat energy, which also increases the cooling cost. Therefore, the key of energy conservation of the modern mobile communication base station is to improve the radio frequency linear power amplifier efficiency of the base station.
Disclosure of Invention
Aiming at the defects in the prior envelope tracking technology, the invention provides a method for generating an indefinite step size reference of a radio frequency power amplifier envelope tracking power supply, which aims to solve the problems of large energy loss and low efficiency when power is supplied in a traditional constant envelope mode in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme: based on a key information string formed by combining time points corresponding to peak values and valley values in an original radio frequency envelope signal and at least one preset switch converter in an envelope tracking power supply corresponding to the key information string, firstly, obtaining each time zone length corresponding to the key information string by a method A; then based on the obtained lengths of the time zones, obtaining constant reference values corresponding to the lengths of the time zones respectively through a method B; finally, based on the obtained lengths of the time zones and the constant reference values corresponding to the lengths of the time zones, obtaining target constant reference values corresponding to the lengths of the target time zones and the lengths of the target time zones by a method C; and then, aiming at each target constant reference value, applying a corresponding envelope tracking power supply switching converter to obtain a voltage signal of the envelope tracking power supply. Further, the method a is any one of the following methods a1, a2, and A3; method A1: based on the key information string, taking N times of working period of each preset switching converter, and taking each N times as the time zone length of the key information string corresponding to the corresponding switching converter, wherein N is greater than 1; then, sequencing the N times of values from small to large, sequencing the switching converters from high to low according to the frequency to form a switching converter sequencing, then sequentially executing the method B and the method C according to the sequence of sequencing the N times of values from small to large, and further executing the method D after the method C; method A2: acquiring a radio frequency envelope waveform amplitude value from an original radio frequency envelope signal, presetting the radio frequency envelope waveform amplitude value, and taking a radio frequency envelope amplitude value region smaller than the preset radio frequency envelope waveform amplitude value as a time region length; method A3: and according to the key information string, taking the interval between adjacent valley points of the radio frequency envelope curves or the interval between any two valley points of the radio frequency envelope curves as the length of a time zone.
Further, the method B includes: and selecting the same type of extreme points in each time zone length as each time zone length end point, respectively calculating weighted average of the same type of extreme points of the radio frequency envelope, and taking the weighted average as a constant reference value of the corresponding time zone length.
Further, the method C is any one of the following methods C1, C2, and C3; method C1: presetting a root mean square difference value between a constant reference value and a radio frequency envelope signal, and taking the constant reference value of which the difference value between the constant reference value and the radio frequency envelope signal is smaller than the root mean square difference value as a target constant reference value; method C2: taking a constant reference value of the peak value or the percentage value of the peak value of the radio frequency envelope curve in each time zone length as a target constant reference value; method C3: and taking a constant reference value as a target constant reference value, wherein the area formed by the constant reference value in each time is equal to the actual area of the length radio frequency envelope signal in the time zone, or the area percentage formed by the constant reference value is equal to the actual area percentage of the length radio frequency envelope signal in the time zone.
Further, the method D comprises: and based on the target constant reference value sorting under the N times of value sorting corresponding to each target constant reference value, each switch converter in the switch converter sorting is applied based on the target constant reference value under the same sequence number in the target constant reference value sorting.
Further, the method for generating the reference with the indefinite step length of the envelope tracking power supply of the radio frequency power amplifier further comprises a subtracter 1, when two switch converters, namely a switch converter 4 and a switch converter 5, are preset in the envelope tracking power supply, and the working frequency of the switch converter 4 is smaller than that of the switch converter 5; the periods of the switching converter 4 and the switching converter 5 are respectively N4And N5And N is4> N5The constant reference values obtained correspondingly are respectively Vref.4、Vref.5To said Vref.4、Vref.5Using a subtracter 1, from Vref.4 Decreasing Vref5Obtaining Vref.44With said Vref.44、Vref.5The switching converter 4 and the switching converter 5, which are envelope tracking power supplies, are applied as target constant reference values, respectively.
Further, the method for generating the radio frequency power amplifier envelope tracking power supply indefinite step size reference further comprises a subtracter 2, when two switch converters 6 and 7 are preset in the envelope tracking power supply, respectively, and the working frequency of the switch converter 6 is less than that of the switch converter 7; the periods of the switch converter 6 and the switch converter 7 are respectively N6And N7And N is6>N7For a constant reference value V obtained by said switching converter 7ref.7And the original RF envelope signal is subtracted by V using a subtractor 2ref.7Obtaining an intermediate signal Vref. middleFrom the intermediate signal Vref. middleFurther obtaining a constant reference value V as a key information stringref.6From said Vref.6And Vref.7The switching converter 6 and the switching converter 7 to which the envelope tracking power supply is applied are respectively associated as target constant reference values.
Further, the lengths of the time zones of the envelope tracking power switch converters for obtaining the corresponding target constant reference values are mutually independent time zone lengths.
The invention provides a device for generating a reference for an envelope tracking power supply of a radio frequency power amplifier with an indefinite step length, which comprises at least one constant reference value generation module, wherein when the envelope tracking power supply comprises M switch converters, the envelope tracking power supply correspondingly comprises M constant reference value generation modules; and the switch converters are in one-to-one correspondence with the constant reference value generation modules, and M is a positive integer greater than 1.
Further, in the apparatus for generating a reference for an envelope curve tracking power supply of a radio frequency power amplifier with an indefinite step size, the key information string is connected to an input end of at least one constant reference value generation module, and a constant reference value is obtained through the constant reference value generation module.
Compared with the prior art, the method for generating the reference of the radio frequency power amplifier envelope tracking power supply with the indefinite step length has the following technical effects: the rf envelope signal has a variable trend, but is based on a signal containing many key point information, such as the peak and valley of the envelope and the relative time point corresponding to the peak and valley. According to the invention, the envelope peak value, the envelope valley value and the key information string of the time point corresponding to the peak value and the envelope valley value are taken as the constant reference value according to the corresponding different time intervals to generate the corresponding reference signal in the switch converter, so that the response rate and the working efficiency of the envelope tracking power supply are effectively improved, the power supply efficiency of the radio frequency power amplifier of the envelope tracking power supply is improved, the hardware calculation workload of the scheme is small, and the required hardware calculation resources are reduced.
Drawings
FIG. 1 is a schematic diagram of a typical envelope tracking power supply architecture;
FIG. 2 is a schematic structural diagram of a first embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a second embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a third embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a fourth embodiment of the present invention;
fig. 6 is a schematic diagram of a reference curve of a switching converter generated in an envelope tracking power supply system in a reference signal generation method according to a fourth embodiment of the present invention.
Detailed Description
In order to better understand the technical content of the present invention, specific embodiments are described below with reference to the accompanying drawings.
Aspects of the invention are described herein with reference to the accompanying drawings, in which a number of illustrative embodiments are shown. Embodiments of the invention are not limited to those shown in the drawings. It is to be understood that the invention is capable of implementation in any of the numerous concepts and embodiments described above and described in detail below, since the disclosed concepts and embodiments are not limited to any particular implementation. In addition, some aspects of the present disclosure may be used alone, or in any suitable combination with other aspects of the present disclosure.
Fig. 1 is a schematic diagram of a typical envelope tracking power supply architecture. If the radio frequency envelope signal generated by the envelope detection unit is directly used as a reference signal of the switching converter, the hardware calculation amount is too large, and the efficiency of the switching converter is reduced. The switching converter has a certain response time due to the influence of energy storage devices such as an inductor and a capacitor, and the switching converter cannot objectively track a reference signal which changes rapidly. Since the output power of the envelope tracking power supply is generated by a combination of a linear amplifier and a switching converter, if the switching converter adopts a constant reference, the output power of the switching converter cannot represent the operating characteristics of a radio frequency signal. Therefore, how to dynamically provide appropriate energy for the switching converter becomes a key technical problem to be solved urgently.
Based on the technical problem, the embodiment of the invention provides a method for generating an indefinite step size reference of a radio frequency power amplifier envelope tracking power supply, which comprises the following steps:
the method comprises the steps that a key information string is formed by combining each peak value and each valley value in an original radio frequency envelope signal with time points corresponding to each peak value and each valley value, and the key information string corresponds to a preset switch converter in an envelope tracking power supply, and each time zone length corresponding to the key information string is obtained firstly; then based on the obtained lengths of the time zones, obtaining constant reference values corresponding to the lengths of the time zones respectively; finally, based on the obtained lengths of the time zones and the constant reference values corresponding to the lengths of the time zones, a target constant reference value corresponding to the length of the target time zone is finally obtained; and aiming at each target constant reference value, applying a corresponding envelope tracking power supply switching converter to obtain a voltage signal of the envelope tracking power supply. Three methods are available for obtaining the length of each time zone corresponding to the key information string, any one of the method A1, the method A2 and the method A3 is selected, and the method A1 is as follows:
method A1: based on the key information string, taking N times of working period of each preset switching converter, and taking each N times as the time zone length of the key information string corresponding to the corresponding switching converter, wherein N is greater than 1; then, sequencing the N times of values from small to large, sequencing the switching converters from high to low according to the frequency to form switching converter sequencing, then sequentially executing the method B and the method C according to the sequence of sequencing the N times of values from small to large, and further executing the method D after the method C;
method A2: acquiring a radio frequency envelope waveform amplitude value from an original radio frequency envelope signal, presetting the radio frequency envelope waveform amplitude value, and taking a radio frequency envelope amplitude value region smaller than the preset radio frequency envelope waveform amplitude value as a time region length; method A3: according to the key information string, taking the valley points of adjacent radio frequency envelope lines or the valley points of any two radio frequency envelope lines as the length of a time zone;
after obtaining the respective time zone lengths corresponding to the key information strings, obtaining the constant reference value corresponding to the time zone lengths by the following method B: and selecting the extreme points of the same type in each time zone length as the length end points of each time zone, respectively calculating the weighted average of the extreme points of the same type of the radio frequency envelope curve, and taking the weighted average as a constant reference value of the corresponding time zone length.
Then, based on the obtained each time zone length and the constant reference value corresponding to each time zone length, a target constant reference value corresponding to the target time zone length and each target time zone length is obtained by any one of the following three methods: method C1: presetting a root mean square difference value between a constant reference value and a radio frequency envelope signal, and taking the constant reference value of which the difference value between the constant reference value and the radio frequency envelope signal is smaller than the root mean square difference value as a target constant reference value; method C2: taking a constant reference value of the peak value or the percentage value of the peak value of the radio frequency envelope curve in each time zone length as a target constant reference value; method C3: taking a constant reference value as a target constant reference value, wherein the area formed by the constant reference value in each time is equal to the actual area of the length radio frequency envelope signal in the time zone, or the area percentage formed by the constant reference value is equal to the actual area percentage of the length radio frequency envelope signal in the time zone; and finally, aiming at each target constant reference value, applying a corresponding envelope tracking power supply switch converter to obtain a voltage signal of the envelope tracking power supply.
However, in the method a1, it is necessary to follow a principle that references generated by different time interval lengths are sent to a switching converter longer than a switching period, a signal obtained by a longer time interval length limiting process is supplied to a low-frequency switching converter to operate after taking a constant reference value for each defined time interval, and a signal obtained by a shorter time interval length limiting process is supplied to a high-frequency switching converter to operate after taking a constant reference value for each defined time interval. The method specifically comprises the following steps: when the method a1 is used, the switching converters sorted from high to low in frequency are obtained, the switching converter sorting is configured, the method B is executed in the order of sorting N times of values from small to large, then any one of the methods C1, C2, and C3 is executed, the target constant reference value sorting in the order of the corresponding N times of values based on each target constant reference value is obtained, and each switching converter in the switching converter sorting is applied based on the target constant reference value sorting in the order of the target constant reference value.
The time zone length satisfies the following condition:
when a constant reference value of a defined time interval is used as a reference signal, the power supply efficiency of a radio frequency power amplifier of the envelope tracking power supply is improved. The power supply efficiency of a radio frequency power amplifier of the envelope tracking power supply can be used as a judgment reference. In practical applications, it is usually preferable to select the optimal time zone length or the approximate optimal time zone length to achieve the best possible power supply efficiency of the rf power amplifier. Exemplarily, if the method a1 is selected, the final time zone length may be set by gradually adjusting the values of N, comparing the power supply efficiencies of the radio frequency power amplifiers of the envelope tracking power supplies corresponding to different values, and selecting the value N of the maximum power supply efficiency of the radio frequency power amplifiers. In a similar manner, for example, in method a3, the most suitable time zone length is determined by gradually selecting the time values of two valley point regions farther away.
Fig. 2 is a schematic diagram of a first embodiment of the present invention, a method of generating a reference signal when there is only one set of switching converters in an envelope tracking power supply. The envelope tracking power supply includes 1 switching converter. For envelope signal peak values, envelope signal valley values and key data strings of corresponding time points of the envelope signal peak values and the envelope signal valley values, N times of the working period of the switching converter is taken as time interval limitation, the same type of extreme value points are taken as time interval end points, the weighted average value of the same type of extreme value points in the time interval is taken as a target constant reference value, and the target constant reference value is provided for the switching converter to be used as a reference control signal of the switching converter.
When the envelope tracking power supply comprises a plurality of switching converters, N times of a plurality of different values are used as time zone lengths, and target constant reference values are generated in the time zone lengths respectively and serve as reference control signals to be supplied to the corresponding switching converters in the envelope tracking power supply system for application.
Fig. 3 is a schematic diagram of a second embodiment of the present invention, and shows a reference signal generating method 1 when two sets of switching converters exist in an envelope tracking power supply. The envelope tracking power supply comprises 2 switching converters: switching converter 2, switching converter 3. Taking N of the switching converter 22By multiplying its time interval length by N of the switching converter 33Is multiplied by its time interval length, and N2 <N3. Analyzing envelope signals to generate a plurality of peak values, valley values and key data strings of corresponding time points of the peak values and the valley values, and obtaining N through a reference generation module 2 and a reference generation module 3 respectively2Multiple time interval limited inner sumN3 Constant reference values 2 and 3, i.e. V, within a time interval limitref2、Vref.3The target constant reference values are respectively used for the switching converter 2 and the switching converter 3.
Taking the structure in FIG. 3 as an example, N2And N3May be both smaller or larger, or one larger and one smaller. However, when the plurality of switching converters have different switching frequencies, there is a correspondence between the frequency at the time zone length corresponding to the minimum values of the plurality of N and the operating frequency of the switching converter. Specifically, the constant reference value generated in the time zone length under the limitation of a smaller N-fold value is supplied to the high-frequency switching converter for operation, and the constant reference value generated in the time zone length under the limitation of a larger N-fold value is supplied to the low-frequency switching converter for operation.
Besides the combination of the plurality of groups of segmented constant reference modules which are directly connected in parallel, a subtracter can be introduced to subtract the output signals of different segmented constant reference modules from the actual radio frequency envelope signal to generate a new reference control signal.
Fig. 4 is a schematic diagram of embodiment 3 of the present invention. Method 2 for generating a target constant reference signal when two groups of switching converters are present in an envelope tracking power supply, the envelope tracking power supply comprising 2 groups of switching converters: the switching converter 4 and the switching converter 5, and the working frequency of the switching converter 4 is less than that of the switching converter 5; taking N of the switching converter 44By multiplying its time interval length by N of the switching converter 55Is multiplied by its time interval length, and N4>N5. Analyzing the radio frequency envelope signal to generate a plurality of peak values, valley values and key information strings of corresponding time points, firstly, generating a signal V by the radio frequency envelope signal key information strings through a segmented constant reference module 5ref.5Generating a signal V via a piecewise constant reference module 4ref.4While a subtractor 1 is introduced, from the signal Vref.4Minus the signal Vref.5Obtain a signal Vref.44. Signal Vref.5Sum signal Vref.44All of which are target constant reference values within the limits of respective time intervals as the switching converter 5 and the switching converter 4 respectivelyThe reference control signal is applied.
Fig. 5 is a schematic diagram of embodiment 4 of the present invention. Method 3 for generating a target constant reference signal when two groups of switching converters are present in an envelope tracking power supply, the envelope tracking power supply comprising 2 groups of switching converters: the switching converter 6 and the switching converter 7, and the working frequency of the switching converter 6 is less than that of the switching converter 7; taking N of the switching converter 66By multiplying its time interval length by N of the switching converter 77Is multiplied by its time interval length, and N6>N7. And analyzing the envelope signal to generate a plurality of key information strings of peak values, valley values and corresponding time points. First, a key information string is transmitted to a constant reference module 7 to generate a signal Vref.7Subtracting the signal V from the actual envelope signalref.7Then obtaining an intermediate signal Vref. middleThen the intermediate signal V is appliedref. middleSent to a constant reference module 6 to obtain a signal Vref.6. Signal Vref.6Sum signal Vref.7The constant reference values are supplied to the switching converter 6 and the switching converter 7 as reference control signals thereof, respectively, as target constant reference values for the respective time zone lengths.
Fig. 3 to 5 are only three methods for generating a target constant reference value and supplying the target constant reference value to an envelope tracking power supply to generate a voltage signal of the envelope tracking power supply. In practical application, a plurality of forms of target constant reference values can be obtained by combining subtracters according to the number of the switching converters and provided for envelope tracking power supply application, but the basic conditions of 'obtaining a constant reference value in each defined time interval and then providing the constant reference value for the signal obtained through long time interval length limiting processing to the low-frequency switching converter for operation, and obtaining a constant reference value in each defined time interval and then providing the constant reference value for the signal obtained through short time interval length limiting processing to the high-frequency switching converter for operation' need to be met, and meanwhile, the height relation of the N values of the segmented constant reference module needs to be considered. In addition, when the tracking power supply includes a plurality of switching converters, the time zone length selection modes or specific parameters of different switching converters are independent from each other, for example, one tracking power supply includes a switching converter a and a switching converter B, the two switching converters may use different switching cycle multiples as time intervals, the multiples used by the switching converter a and the switching converter B are independent from each other, and the time intervals of the two switching converters are limited to be respectively corresponding to integral multiples of their own switching cycles.
Fig. 6 shows a waveform description of a specific implementation according to the fourth embodiment. The specific processing steps for analyzing the envelope signal to generate a plurality of peak values, valley values and key data strings of corresponding time points are as follows: step I: and analyzing the envelope signal to generate a plurality of key data strings of peak values, valley values and corresponding time points. Generating a radio frequency envelope signal, namely phi in figure 6, and simultaneously inputting a key information string into a constant reference module 7, wherein the working frequency of a first group of switching converters corresponding to the constant reference module 7 is 330kHz, and the N value, namely N, of the constant reference module 775, namely the shortest limit of the time zone length is 15us, the peak value point or the valley value point is taken as a time zone division point, the weighted average value of the peak value and the valley value in the time zone is taken as a constant reference value, and a constant reference value V is generatedref.7I.e., FIG. 6. Step II: the radio frequency envelope signal, i.e. in fig. 6 (— V), is subtracted by the signal V generated by the constant reference module 7ref.7I.e. in fig. 6, obtaining an intermediate signal Vref. middleAfter that, the intermediate signal V is appliedref. middleSending into a constant reference module 6, wherein the operating frequency of a second group of switching converters corresponding to the constant reference module 6 is 667kHz, and the value N of the constant reference module 6 is N 62, i.e. the minimum time interval is limited to 3us, the peak point or the valley point is taken as the time interval division point, and the weighted average value of the signals in the time interval is taken as a constant reference value, i.e. the signal Vref.6I.e. diagram 6. The current output by the two switching converter circuits is fitted with constant reference value waveforms II and III according to a certain amplified multiple.
The output of the switch converter has a certain difference value with the actual envelope signal, and the signal is amplified and output through a linear power amplifier. The output of the linear power amplifier and the output of the switch converter are superposed to form the required working voltage of the radio frequency power amplifier.
Compared with the prior art, the method for generating the reference of the radio frequency power amplifier envelope tracking power supply with the indefinite step length has the following technical effects: the rf envelope signal has a variable trend, but is based on a signal containing many key point information, such as the peak and valley of the envelope and the relative time point corresponding to the peak and valley. According to the invention, the envelope peak value, the envelope valley value and the key information string of the time point corresponding to the peak value and the envelope valley value are taken as the constant reference value according to the corresponding different time intervals to generate the corresponding reference signal in the switch converter, so that the response rate and the working efficiency of the envelope tracking power supply are effectively improved, the power supply efficiency of the radio frequency power amplifier of the envelope tracking power supply is improved, the hardware calculation workload of the scheme is small, and the required hardware calculation resources are reduced.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the protection scope of the present invention should be determined by the appended claims.

Claims (10)

1. The method for generating the reference of the radio frequency power amplifier envelope tracking power supply with the indefinite step length is characterized in that based on a key information string which is formed by combining each peak value and each valley value in an original radio frequency envelope signal and time points respectively corresponding to each peak value and valley value, and at least one preset switch converter in the envelope tracking power supply corresponding to the key information string, the length of each time zone corresponding to the key information string is obtained through a method A; then based on the obtained lengths of the time zones, obtaining constant reference values corresponding to the lengths of the time zones respectively through a method B; finally, based on the obtained lengths of the time zones and the constant reference values corresponding to the lengths of the time zones, obtaining target constant reference values corresponding to the lengths of the target time zones and the lengths of the target time zones by a method C; and then, aiming at each target constant reference value, applying a corresponding envelope tracking power supply switching converter to obtain a voltage signal of the envelope tracking power supply.
2. The method for generating the reference with the indefinite step size of the envelope curve tracking power supply of the radio frequency power amplifier according to claim 1, wherein the method A is any one of the following methods A1, A2 and A3; method A1: based on the key information string, taking N times of working period of each preset switching converter, and taking each N times as the time zone length of the key information string corresponding to the corresponding switching converter, wherein N is greater than 1; then, sequencing the N times of values from small to large, sequencing the switching converters from high to low according to the frequency to form a switching converter sequencing, then sequentially executing the method B and the method C according to the sequence of sequencing the N times of values from small to large, and further executing the method D after the method C; method A2: acquiring a radio frequency envelope curve amplitude value from an original radio frequency envelope curve signal, presetting the radio frequency envelope curve amplitude value, and taking a radio frequency envelope curve amplitude value area smaller than the preset radio frequency envelope curve amplitude value as a time zone length; method A3: and according to the key information string, taking the interval between the valley points of the adjacent radio frequency envelope lines or the interval between any two valley points of the radio frequency envelope lines as the length of a time zone.
3. The method for generating the reference with the indefinite step size of the envelope curve tracking power supply of the radio frequency power amplifier according to claim 1, wherein the method B comprises the following steps: and selecting the same type of extreme points in each time zone length as each time zone length end point, respectively calculating weighted average of the same type of extreme points of the radio frequency envelope, and taking the weighted average as a constant reference value of the corresponding time zone length.
4. The method for generating the reference with the indefinite step size of the envelope curve tracking power supply of the radio frequency power amplifier according to claim 1, wherein the method C is any one of the following methods C1, C2 and C3; method C1: presetting a root mean square difference value between a constant reference value and a radio frequency envelope signal, and taking the constant reference value of which the difference value between the constant reference value and the radio frequency envelope signal is smaller than the root mean square difference value as a target constant reference value; method C2: taking a constant reference value of the peak value or the percentage value of the peak value of the radio frequency envelope curve in each time zone length as a target constant reference value; method C3: and taking a constant reference value as a target constant reference value, wherein the area formed by the constant reference value in each time is equal to the actual area of the length radio frequency envelope signal in the time zone, or the area percentage formed by the constant reference value is equal to the actual area percentage of the length radio frequency envelope signal in the time zone.
5. The method for generating the reference with the indefinite step size of the envelope curve tracking power supply of the radio frequency power amplifier according to claim 2, wherein the method D comprises the following steps: and based on the target constant reference value sorting under the N times of value sorting corresponding to each target constant reference value, each switch converter in the switch converter sorting is applied based on the target constant reference value under the same sequence number in the target constant reference value sorting.
6. The method for generating the reference with the indefinite step size of the envelope tracking power supply of the radio frequency power amplifier according to claim 1, further comprising a subtracter 1, wherein when two switch converters, namely a switch converter 4 and a switch converter 5, are preset in the envelope tracking power supply, and the operating frequency of the switch converter 4 is less than that of the switch converter 5; the periods of the switching converter 4 and the switching converter 5 are respectively N4And N5And N is4> N5The constant reference values obtained correspondingly are respectively Vref.4、Vref.5To said Vref.4、Vref.5Using a subtracter 1, from Vref.4 Decreasing Vref5Obtaining Vref.44With said Vref.44、Vref.5The switching converter 4 and the switching converter 5, which are envelope tracking power supplies, are applied as target constant reference values, respectively.
7. The method for generating the reference with the indefinite step size of the envelope tracking power supply of the radio frequency power amplifier according to claim 1, further comprising a subtracter 2, wherein when the envelope tracking power supply has two preset switch converters, namely a switch converter 6 and a switch converter respectivelyThe working frequency of the switching converter 6 is less than that of the switching converter 7; the periods of the switch converter 6 and the switch converter 7 are respectively N6And N7And N is6<N7For a constant reference value V obtained by said switching converter 7ref.7And the original RF envelope signal is subtracted by V using a subtractor 2ref.7Obtaining an intermediate signal Vref. middleFrom the intermediate signal Vref. middleFurther obtaining a constant reference value V as a key information stringref.6From said Vref.6And Vref.7The switching converter 6 and the switching converter 7 to which the envelope tracking power supply is applied are respectively associated as target constant reference values.
8. The method for generating the reference with the indefinite step size of the envelope curve tracking power supply of the radio frequency power amplifier according to claim 1, wherein the length of the time zone in which each switch converter obtains the corresponding target constant reference value is the length of the time zone which is independent of each other.
9. A device based on the method for generating the reference of the envelope curve tracking power supply of the radio frequency power amplifier according to any one of claims 1 to 5, wherein the device comprises at least one constant reference value generating module, and when the envelope curve tracking power supply comprises M switching converters, the M constant reference value generating modules are correspondingly included; and the switch converters are in one-to-one correspondence with the constant reference value generation modules, and M is a positive integer greater than 1.
10. The apparatus for generating an indefinite step size reference for an envelope tracking power supply of a radio frequency power amplifier according to claim 9, wherein the key information string is connected to an input terminal of at least one constant reference value generating module, and the constant reference value is obtained by the constant reference value generating module.
CN202210210424.5A 2022-03-04 2022-03-04 Method and device for generating reference of radio frequency power amplifier envelope tracking power supply with indefinite step length Pending CN114649938A (en)

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