Method and device for generating a reference with variable step for an envelope tracking power supply of a radio frequency power amplifier

Abstract

The present invention discloses a method and device for generating a reference with variable step sizes for an envelope tracking power supply of a radio frequency power amplifier. From the peaks and valleys in the original radio frequency envelope signal, a key information string formed by combining the peaks and valleys and the time points corresponding thereto respectively, and a preset switching converter in the envelope tracking power supply corresponding to the key information string, first obtain the lengths of each time zone corresponding to the key information string; then, based on the obtained lengths of each time zone, obtain the constant reference values corresponding to the lengths of each time zone respectively; finally, based on the obtained lengths of each time zone and the constant reference values corresponding to the lengths of each time zone respectively, finally obtain the target constant reference value corresponding to the target time zone length; for each target constant reference value, apply the corresponding envelope tracking power supply switching converter to obtain the voltage signal of the envelope tracking power supply. This method greatly reduces the computational amount of the control hardware and effectively improves the radio frequency power amplifier power supply efficiency of the envelope tracking power supply.

Description

Technical Field

[0001] The present invention relates to the field of communications, and more particularly to a method for generating an indefinite step reference for an envelope tracking power supply of a radio frequency power amplifier. Background Art

[0002] In order to increase the amount of information transmitted within a limited frequency bandwidth, modern communication systems continuously adopt modulation techniques with higher spectrum utilization rates to modulate the amplitude, phase, frequency, etc. of signals, so that the amplitude of the envelope of the radio frequency signal no longer remains constant and has an increasingly high peak-to-average ratio. Continuing to supply power in the traditional constant envelope manner can ensure the distortion-free transmission of radio frequency signals, but it will cause large energy losses and low efficiency. At the same time, most of the lost energy is dissipated in the form of heat, which also increases the cooling cost. Therefore, improving the efficiency of base station radio frequency linear power amplifiers is the key to energy conservation in modern mobile communication base stations. Currently, the envelope tracking technology is one of the most effective methods to improve the efficiency of radio frequency power amplifiers. Summary of the Invention

[0003] Aiming at the deficiencies in the existing envelope tracking technology, the present invention provides a method for generating an indefinite step reference for an envelope tracking power supply of a radio frequency power amplifier to solve the problems of large energy losses and low efficiency in the existing technology when using the traditional constant envelope method for power supply.

[0004] To achieve the above object, the present invention provides the following technical solution: Based on the key information string composed of each peak value and each valley value in the original radio frequency envelope signal, combined with the time points corresponding to each peak value and valley value, and at least one preset switching converter in the envelope tracking power supply corresponding to the key information string, first obtain the length of each time zone corresponding to the key information string through Method A; then, based on the obtained lengths of each time zone, obtain the constant reference value corresponding to each time zone length through Method B; finally, based on the obtained lengths of each time zone and the constant reference value corresponding to each time zone length, obtain the target time zone length and the target constant reference value corresponding to each target time zone length through Method C; then, for each target constant reference value, apply the corresponding envelope tracking power supply switching converter to obtain the voltage signal of the envelope tracking power supply.

[0005] Further, the aforementioned Method A is any one of the following Method A1, Method A2, and Method A3;

[0006] Method A1: Based on the key information string, take N times the working cycle of each pre-set switching converter, and use each N times value as the time zone length corresponding to the key information string of the corresponding switching converter, where N>1; then sort each N times value from smallest to largest, and at the same time sort each switching converter from highest to lowest frequency to form a switching converter sorting. After that, execute Method B and Method C in sequence according to the order of sorting the N times values from smallest to largest, and Method D is also included after Method C;

[0007] Method A2: Obtain the amplitude of the RF envelope waveform from the original RF envelope signal, preset the amplitude of the RF envelope waveform, and take the RF envelope amplitude region smaller than the preset RF envelope waveform amplitude as the time zone length; Method A3: According to the key information string, use the interval between adjacent RF envelope valley points or between any two RF envelope valley points as the time zone length.

[0008] Method B is: Select the same type of extreme points as the endpoints of each time zone length within each time zone length, and calculate the weighted average of the same type of extreme points of the RF envelope respectively, and use this weighted average as the constant reference value corresponding to the time zone length.

[0009] Method C is any one of the following Method C1, Method C2, and Method C3; Method C1: Preset the root mean square difference between the constant reference value and the RF envelope signal, and take the constant reference value with the difference between the constant reference value and the RF envelope signal less than the root mean square difference as the target constant reference value; Method C2: Take the constant reference value of the peak or peak percentage value of the RF envelope within each time zone length as the target constant reference value; Method C3: Take the constant reference value whose area formed within each time is equal to the actual area of the RF envelope signal in this time zone length or the percentage value of the area formed by the constant reference value equal to the percentage value of the actual area of the RF envelope signal in this time zone length as the target constant reference value;

[0010] Further, the aforementioned Method D is: Based on the sorting of the target constant reference values according to the N times values corresponding to each target constant reference value, each switching converter in the switching converter sorting is applied based on the target constant reference value at the same serial number in the target constant reference value sorting.

[0011] Further, for the aforementioned method for generating the variable step reference of the RF power amplifier envelope tracking power supply, when there are two pre-set switching converters in the envelope tracking power supply, namely switching converter 4 and switching converter 5, and the operating frequency of switching converter 4 is less than that of switching converter 5; the periods of switching converter 4 and switching converter 5 are N4 and N5 respectively, and N4>N5, and the corresponding obtained constant reference values are V ref.4 、V ref.5, for the said V ref.4 、V ref.5 Apply subtractor 1, subtract V ref.4 from V ref5 to obtain V ref.44 , and use the said V ref.44 、V ref.5 as the target constant reference values respectively, and correspondingly apply switching converters 4 and 5 of the envelope tracking power supply.

[0012] Furthermore, for the above-mentioned radio frequency power amplifier envelope tracking power supply variable-step reference generation method, it is characterized in that when there are two preset switching converters in the envelope tracking power supply, namely switching converter 6 and switching converter 7, and the operating frequency of switching converter 6 is less than that of switching converter 7; the periods of the switching converter 6 and the switching converter 7 are N6 and N7 respectively, and N6 > N7. Apply subtractor 2 to the constant reference value V ref.7 obtained by the switching converter 7 and the original radio frequency envelope signal, subtract V ref.7 from the original radio frequency envelope signal to obtain the intermediate signal V ref.中间 , use this intermediate signal V ref.中间 as the key information string to further obtain the constant reference value V ref.6 , and use the said V ref.6 and V ref.7 as the target constant reference values respectively, and correspondingly apply switching converter 6 and switching converter 7 of the envelope tracking power supply.

[0013] Furthermore, the time zone lengths for each switching converter of the envelope tracking power supply to obtain the corresponding target constant reference value are independent time zone lengths.

[0014] On the other hand, the present invention proposes a device for the radio frequency power amplifier envelope tracking power supply variable-step reference generation method. The device includes at least one constant reference value generation module. When there are M switching converters in the envelope tracking power supply, it correspondingly includes M constant reference value generation modules; and the switching converter and the constant reference value generation module are in one-to-one correspondence, and M is a positive integer greater than 1.

[0015] Furthermore, for the device for the radio frequency power amplifier envelope tracking power supply variable-step reference generation method, the key information string is connected to the input end of at least one constant reference value generation module, and the constant reference value is obtained through the constant reference value generation module.

[0016] The present invention relates to a method for generating a reference signal with variable step size for the envelope tracking power supply of a radio frequency power amplifier. Compared with the prior art using the above technical solutions, the following technical effects are achieved: The change trend of the radio frequency envelope signal is variable, but it contains a lot of key point information, such as the peak and valley values of the envelope and the relative time points corresponding to the peak and valley values. The present invention takes the key information series of the peak and valley values of the envelope and the time points corresponding to the peak and valley values and takes a constant reference value within the corresponding different time intervals to generate the reference signal in the corresponding switched-mode converter, effectively improving the response rate and working efficiency of the envelope tracking power supply, improving the power supply efficiency of the radio frequency power amplifier of the envelope tracking power supply, and reducing the required hardware computing resources with less hardware computing workload for this solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of a typical envelope tracking power supply architecture;

[0018] Figure 2 Schematic diagram of the structure of the first embodiment of the present invention;

[0019] Figure 3 is a schematic diagram of the structure of the second embodiment of the present invention;

[0020] Figure 4 is a schematic diagram of the structure of the third embodiment of the present invention;

[0021] Figure 5 is a schematic diagram of the structure of the fourth embodiment of the present invention;

[0022] Figure 6 is a schematic diagram of the reference benchmark curve generated in the envelope tracking power supply system when the reference signal generation method of the fourth embodiment of the present invention is used. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] In order to better understand the technical content of the present invention, specific embodiments are given below in conjunction with the accompanying drawings for illustration.

[0024] In the present invention, various aspects of the present invention are described with reference to the accompanying drawings, in which many illustrative embodiments are shown. The embodiments of the present invention are not limited to those shown in the drawings. It should be understood that the present invention can be implemented by any one of the various concepts and embodiments introduced above and the concepts and embodiments described in detail below, because the concepts and embodiments disclosed in the present invention are not limited to any embodiment. In addition, some aspects disclosed in the present invention can be used alone, or in any suitable combination with other aspects disclosed in the present invention.

[0025] Figure 1It is a schematic diagram of a typical envelope tracking power supply architecture. If the radio frequency envelope signal generated in the envelope detection section is directly used as the reference signal of the switching converter, the hardware calculation amount is too large and the efficiency of the switching converter decreases. Due to the influence of energy storage devices such as inductors and capacitors, the switching converter has a certain response time. Objectively, the switching converter cannot track a rapidly changing reference signal. Since the output power of the envelope tracking power supply is generated by the combination of a linear amplifier and a switching converter, if the switching converter uses a constant reference, its output power cannot reflect the working characteristics of the radio frequency signal. Therefore, how to dynamically provide appropriate energy for the switching converter has become a key technical problem to be solved urgently.

[0026] Based on the foregoing technical problems, the embodiment of the present invention proposes a method for generating an indefinite step size reference for the envelope tracking power supply of a radio frequency power amplifier. The generation method includes the following steps:

[0027] From the peaks and valleys in the original radio frequency envelope signal, the key information string composed of the time points corresponding to the peaks and valleys respectively, and the preset switching converter in the envelope tracking power supply corresponding to the key information string, first obtain the length of each time zone corresponding to the key information string; then based on the obtained lengths of each time zone, obtain the constant reference value corresponding to each length of the time zone respectively; finally, based on the obtained lengths of each time zone and the constant reference values corresponding to each length of the time zone respectively, finally obtain the target constant reference value corresponding to the target time zone length; for each target constant reference value, apply the corresponding switching converter of the envelope tracking power supply to obtain the voltage signal of the envelope tracking power supply. There are three methods for obtaining the length of each time zone corresponding to the key information string. Arbitrarily select any one of Method A1, Method A2, and Method A3. Method A1:

[0028] Method A1: Based on the key information string, take N times the working cycle of each preset switching converter, and use each N times value as the time zone length of the key information string corresponding to the corresponding switching converter, where N>1; then sort each N times value from small to large, and at the same time sort each switching converter from high to low according to frequency to form a switching converter sorting. Then, execute Method B and Method C in sequence according to the order of sorting the N times values from small to large, and Method D is also included after Method C;

[0029] Method A2: Obtain the amplitude of the radio frequency envelope waveform from the original radio frequency envelope signal, and preset the amplitude of the radio frequency envelope waveform. Take the radio frequency envelope amplitude region smaller than the preset radio frequency envelope waveform amplitude as the time zone length; Method A3: According to the key information string, use the interval between adjacent radio frequency envelope valley points or between any two radio frequency envelope valley points as the time zone length;

[0030] After obtaining the lengths of each time zone corresponding to the key information string, the following method B is used to obtain the constant reference value corresponding to the length of the time zone: Select the same type of extreme points as the endpoints of each time zone length within each time zone length, and calculate the weighted average of the same type of extreme points of the radio frequency envelope line respectively. Take this weighted average as the constant reference value corresponding to the length of the time zone.

[0031] After that, based on the obtained lengths of each time zone and the constant reference values corresponding to each time zone length respectively, any one of the following three methods is used to obtain the target time zone length and the target constant reference value corresponding to each target time zone length: Method C1: Preset the root mean square difference between the constant reference value and the radio frequency envelope line signal, and take the constant reference value whose difference from the radio frequency envelope line signal is less than the root mean square difference as the target constant reference value; Method C2: Take the constant reference value of the peak or peak percentage value of the radio frequency envelope line within each time zone length as the target constant reference value; Method C3: Take the constant reference value whose area formed within each time zone is equal to the actual area of the radio frequency envelope line signal in this time zone length or the percentage value of the area formed by the constant reference value is equal to the percentage value of the actual area of the radio frequency envelope line signal in this time zone length as the target constant reference value; Finally, for each target constant reference value, apply the corresponding envelope tracking power switch converter to obtain the voltage signal of the envelope tracking power supply.

[0032] However, when using method A1, a principle must be followed, that is, the reference values generated by different time interval lengths are sent to the switch converter with a period greater than the switching period. The signal obtained through the processing of the longer time interval length limit is provided to the low-frequency switch converter for operation after taking the constant reference value within each defined time interval, and the signal obtained through the processing of the shorter time interval length limit is provided to the high-frequency switch converter for operation after taking the constant reference value within each defined time interval. Specifically, when using method A1, obtain each switch converter sorted from high to low in frequency, form the switch converter sorting, and execute the aforementioned method B in the order of sorting the N values from small to large. Then execute any one of the aforementioned method C1, method C2, and method C3 to obtain the target constant reference value sorting based on the N values corresponding to each target constant reference value. Apply the target constant reference value with the same serial number in the target constant reference value sorting to each switch converter in the switch converter sorting respectively.

[0033] The length of the time zone satisfies the following conditions:

[0034] When using a constant reference value within a defined time interval as the reference signal, the power supply efficiency of the RF power amplifier in the envelope tracking power supply becomes higher. The power supply efficiency of the RF power amplifier in the envelope tracking power supply can be used as the judgment criterion. In practical applications, it is usually more inclined to select the optimal time zone length or an approximate optimal time zone length to achieve the best possible power supply efficiency of the RF power amplifier. Exemplarily, if method A1 is selected, the value of N can be gradually adjusted, the power supply efficiency of the RF power amplifier in the envelope tracking power supply corresponding to different values can be compared, and the value of N corresponding to the maximum power supply efficiency of the RF power amplifier can be selected to set the final time zone length. The other two methods are similar. For example, in method A3, by gradually selecting the time values in two valley point regions that are farther apart, the most suitable time zone length can be determined.

[0035] Figure 2 Schematic diagram of the first embodiment of the present invention, a method for generating a reference signal when there is only one set of switching converters in the envelope tracking power supply. There is 1 switching converter in this envelope tracking power supply. For the key data string of the peak value, valley value and their corresponding time points of the envelope signal, by taking N times the working cycle of the switching converter as the time interval limit, using the same type of extreme points as the endpoints of the time interval, and taking the weighted average of the same type of extreme points within this time interval as the target constant reference value, and providing it to the switching converter as its reference control signal for application.

[0036] When there are multiple switching converters in the envelope tracking power supply, target constant reference values are generated within multiple time zone lengths that are N times different values respectively, and used as reference control signals to be provided for corresponding switching converters in the envelope tracking power supply system for application.

[0037] Figure 3 Schematic diagram of the second embodiment of the present invention, method 1 for generating a reference signal when there are two sets of switching converters in the envelope tracking power supply. There are 2 switching converters in this envelope tracking power supply: switching converter 2 and switching converter 3. Take N2 times of switching converter 2 as its time zone length, take N3 times of switching converter 3 as its time zone length, and N2 < N3. After analyzing the envelope signal to generate several key data strings of peak values, valley values and their corresponding time points, they pass through reference generation module 2 and reference generation module 3 respectively to obtain constant reference values 2 and 3 within the N2 - fold time interval limit and the N3 - fold time interval limit, that is, V ref2 、V ref.3 , which are used as target constant reference values respectively and provided for switching converter 2 and switching converter 3 for application.

[0038] With Figure 3Taking the structure in as an example, both N2 and N3 can be relatively small values, relatively large values, or one large and one small. However, when multiple switching converters have different switching frequencies, there is a corresponding relationship between the frequency within the time zone length corresponding to the minimum value of multiple aforementioned Ns and the operating frequency of the switching converter. Specifically, the constant reference value generated within the time zone length restricted by a smaller N multiple is provided for the operation of the high-frequency switching converter, and the constant reference value generated within the time zone length restricted by a larger N multiple is provided for the operation of the low-frequency switching converter.

[0039] In addition to the above combinations of directly paralleling multi-component segmented constant reference modules, a subtractor can also be introduced to subtract the output signals of different segmented constant reference modules from the actual RF envelope signal to generate a new reference control signal.

[0040] Figure 4 This is the schematic diagram of the 3rd embodiment of the present invention. A method 2 for generating a target constant reference signal when there are two groups of switching converters in the envelope tracking power supply. There are two groups of switching converters in this envelope tracking power supply: switching converter 4 and switching converter 5, and the operating frequency of switching converter 4 is less than that of switching converter 5; take N4 times of switching converter 4 as its time zone length, take N5 times of switching converter 5 as its time zone length, and N4 > N5. Analyze the RF envelope signal to generate a key information string of several peaks, valleys and their corresponding time points. First, the key information string of the RF envelope signal passes through the segmented constant reference module 5 to generate signal V ref.5 , and generates signal V after passing through the segmented constant reference module 4 ref.4 . At the same time, subtractor 1 is introduced, and signal V ref.4 subtracts signal V ref.5 to obtain signal V ref.44 . Both signal V ref.5 and signal V ref.44 are the target constant reference values within their respective time interval restrictions, and are respectively applied as the reference control signals for switching converter 5 and switching converter 4.

[0041] Figure 5 This is the schematic diagram of the 4th embodiment of the present invention. A method 3 for generating a target constant reference signal when there are two groups of switching converters in the envelope tracking power supply. There are two groups of switching converters in this envelope tracking power supply: switching converter 6 and switching converter 7, and the operating frequency of switching converter 6 is less than that of switching converter 7; take N6 times of switching converter 6 as its time zone length, take N7 times of switching converter 7 as its time zone length, and N6 > N7. Analyze the envelope signal to generate a key information string of several peaks, valleys and their corresponding time points. First, the key information string is passed into the constant reference module 7 to generate signal V ref.7 , and the intermediate signal V is obtained after subtracting signal V ref.7 from the actual envelope signal.ref.中间 , and then send the intermediate signal V ref.中间 to the constant reference module 6 to obtain the signal V ref.6 . The signal V ref.6 and the signal V ref.7 are respectively used as the target constant reference values for the lengths of their respective time zones, and are provided to the switching converter 6 and the switching converter 7 as their reference control signals for application.

[0042] Figures 3 to 5 These are just three methods for generating the target constant reference value and providing the target constant reference value to the envelope tracking power supply to generate the voltage signal of the corresponding envelope tracking power supply. In practical applications, according to the number of switching converters, combined with the combination performed by the subtractor, more forms of target constant reference values can be obtained and provided to the envelope tracking power supply for application, but it is necessary to meet the basic condition that "the signal obtained through the processing of the long time interval length limit takes the constant reference value in each defined time interval and is provided to the low-frequency switching converter for operation, and the signal obtained through the processing of the short time interval length limit takes the constant reference value in each defined time interval and is provided to the high-frequency switching converter for operation", and at the same time, it is necessary to consider the high and low relationship of the aforementioned N value of the segmented constant reference module. In addition, when the tracking power supply contains multiple switching converters, the time zone length selection method or specific parameters of different switching converters are independent of each other. For example, a tracking power supply contains switching converter A and switching converter B, and the two can use different multiples of the switching converter switching period as the time interval. The multiples used by switching converter A and switching converter B are independent of each other, and the time interval limits of the two respectively correspond to integer multiples of their own switching periods.

[0043] Figure 6 shows the specific implementation waveform description based on the fourth embodiment. The specific processing steps for analyzing the envelope signal to generate several key data strings of peaks, valleys and their corresponding time points are as follows:

[0044] Step I: Generate several key data strings of peaks, valleys and their corresponding time points by analyzing the envelope signal. Generate the radio frequency envelope signal, that is, for example Figure 6 in ①, and at the same time input the key information string into the constant reference module 7. The operating frequency of the first group of switching converters corresponding to the constant reference module 7 is 330 kHz, and the N value of the constant reference module 7, that is, N7, is 5, that is, the shortest limit of the time zone length is 15 us. Taking the peak point or valley point as the time interval segmentation point, the weighted average value of the peak and valley values within this time interval is used as the constant reference value to generate the constant reference value V ref.7 , that is, for example Figure 6 in ②.

[0045] Step II: Take the radio frequency envelope signal, that is, for example Figure 6In ①, subtract the signal V generated by the constant reference module 7 ref.7 , that is, in Figure 6 ②, to obtain the intermediate signal V ref.中间 . After that, send the intermediate signal V ref.中间 to the constant reference module 6. The operating frequency of the second set of switching converters corresponding to the constant reference module 6 is 667 kHz, and the aforementioned N value of the constant reference module 6, i.e., N6, is 2. That is, the shortest limit of the time zone length is 3 us. Taking the peak point or valley point as the time interval segmentation point, the weighted average value of the signal within this time zone length is used as the constant reference value, that is, the signal V ref.6 , that is, in Figure 6 ③. The currents output by the two switching converter circuits fit the constant reference value waveforms ② and ③ according to a certain amplification multiple.

[0046] There is a certain difference between the output of the switching converter and the actual envelope signal, and this signal is amplified and output by the linear power amplifier. The output of the linear power amplifier and the output of the switching converter are superimposed to form the working voltage required for the RF power amplifier.

[0047] For the method for generating an indefinite step reference of the envelope tracking power supply of the RF power amplifier according to the present invention, compared with the prior art by adopting the above technical solutions, it has the following technical effects: The change trend of the RF envelope signal is indefinite, but it contains many key point information, such as the envelope peak, valley, and the relative time points corresponding to the peak and valley. The present invention takes the key information strings of the envelope peak, valley, and the time points corresponding to the peak and valley and takes the constant reference value within the corresponding different time intervals to generate the reference signal in the corresponding switching converter, effectively improving the response rate and working efficiency of the envelope tracking power supply, improving the power supply efficiency of the RF power amplifier of the envelope tracking power supply, and reducing the required hardware calculation resources due to the small hardware calculation workload of this solution.

[0048] Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Those with ordinary knowledge in the technical field to which the present invention pertains can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to what is defined by the claims.

Claims

1. A method for generating a reference with variable step size for the envelope tracking power supply of a radio frequency power amplifier, characterized in that, Based on the key information string formed by each peak and each valley value in the original RF envelope signal, combined with the time points corresponding to each peak and valley value, and at least one preset switching converter in the envelope tracking power supply corresponding to the key information string, first obtain the length of each time zone corresponding to the key information string through Method A; then, based on the obtained lengths of each time zone, obtain the constant reference value corresponding to each time zone length through Method B; finally, based on the obtained lengths of each time zone and the constant reference values corresponding to each time zone length, obtain the target time zone length and the target constant reference value corresponding to each target time zone length through Method C; then, for each target constant reference value, apply the corresponding envelope tracking power supply switching converter to obtain the voltage signal of the envelope tracking power supply. The Method A is any one of the following Method A1, Method A2, and Method A3; Method A1: Based on the key information string, take N times the working cycle of each preset switching converter, and use each N times value as the time zone length of the key information string corresponding to the corresponding switching converter, where N>1; then sort each N times value from small to large, and at the same time sort each switching converter from high to low according to frequency to form a switching converter sorting. After that, execute Method B and Method C in sequence according to the order of sorting the N times values from small to large, and Method D is also included after Method C; Method A2: Obtain the amplitude of the RF envelope waveform from the original RF envelope signal, preset the amplitude of the RF envelope waveform, and take the RF envelope amplitude region smaller than the preset RF envelope waveform amplitude as the time zone length; Method A3: According to the key information string, use the interval between adjacent RF envelope valley points or between any two RF envelope valley points as the time zone length. The Method B: Select the same type of extreme points as the endpoints of each time zone length within each time zone length, and respectively calculate the weighted average of the same type of extreme points of the RF envelope to use this weighted average as the constant reference value corresponding to the time zone length. The Method C is any one of the following Method C1, Method C2, and Method C3; C1: Preset the root mean square difference between the constant reference value and the RF envelope signal, and take the constant reference value whose difference from the RF envelope signal is less than the root mean square difference as the target constant reference value. C2: Take the constant reference value of the peak or peak percentage value of the RF envelope within each time zone length as the target constant reference value. C3: Take the constant reference value whose area formed within each time zone is equal to the actual area of the RF envelope signal in this time zone length or the percentage of the area formed by the constant reference value is equal to the percentage of the actual area of the RF envelope signal in this time zone length as the target constant reference value. Method D is: Based on the sorting of the target constant reference values according to the N times values corresponding to each target constant reference value, each switching converter in the switching converter sorting is applied based on the target constant reference value with the same serial number in the target constant reference value sorting.

2. The method for generating an asynchronous reference of the envelope tracking power supply of the RF power amplifier according to claim 1, wherein When there are two preset switching converters in the envelope tracking power supply, namely switching converter 4 and switching converter 5, and the operating frequency of switching converter 4 is less than that of switching converter 5; the periods of the switching converter 4 and the switching converter 5 are N4 and N5 respectively, and N4 > N5, and the corresponding obtained constant reference values are V ref.4 , V ref.5 , for the V ref.4 , V ref.5 , apply subtractor 1, subtract V ref.4 from V ref5 to obtain V ref.44 , using the V ref.44 , V ref.5 as the target constant reference values respectively, and correspondingly apply switching converter 4 and switching converter 5 of the envelope tracking power supply.

3. The method for generating an asynchronous reference of the envelope tracking power supply of the RF power amplifier according to claim 1, wherein When there are two preset switching converters in the envelope tracking power supply, namely switching converter 6 and switching converter 7, and the operating frequency of switching converter 6 is less than that of switching converter 7; the periods of the switching converter 6 and the switching converter 7 are N6 and N7 respectively, and N6 < N7, a constant reference value V obtained from the switching converter 7 ref.7 and the original RF envelope signal are applied to a subtractor 2, and the original RF envelope signal is subtracted by V ref.7 to obtain an intermediate signal V ref.中间 From this intermediate signal V ref.中间 as a key information string, a constant reference value V is further obtained ref.6 From the V ref.6 and V ref.7 are respectively used as the target constant reference values, corresponding to the switching converter 6 and the switching converter 7 of the envelope tracking power supply respectively.

4. The method for generating an asynchronous reference of the envelope tracking power supply of the RF power amplifier according to claim 1, wherein The time zone lengths for each switching converter to obtain the corresponding target constant reference value are independent of each other in length.

5. An apparatus for a method of generating a reference with an indefinite step size for a radio frequency power amplifier envelope tracking power supply according to any one of claims 1-4, characterized in that, The device includes at least one constant reference value generation module. When there are M switching converters in the envelope tracking power supply, M corresponding constant reference value generation modules are included; and the switching converters and the constant reference value generation modules are in one-to-one correspondence, where M is a positive integer greater than 1.

6. The device for generating the reference of the variable step size of the envelope tracking power supply of the RF power amplifier according to claim 5, wherein The key information string is connected to the input end of at least one constant reference value generation module, and the constant reference value is obtained through the constant reference value generation module.

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