CN107948116B - Power amplifying device based on polar modulation - Google Patents

Power amplifying device based on polar modulation Download PDF

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CN107948116B
CN107948116B CN201711046063.0A CN201711046063A CN107948116B CN 107948116 B CN107948116 B CN 107948116B CN 201711046063 A CN201711046063 A CN 201711046063A CN 107948116 B CN107948116 B CN 107948116B
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power amplifier
signal
jitter
module
power
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CN107948116A (en
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刘大可
苗志东
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Beijing University of Technology
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Beijing University of Technology
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/36—Modulator circuits; Transmitter circuits
    • H04L27/361—Modulation using a single or unspecified number of carriers, e.g. with separate stages of phase and amplitude modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/36—Modulator circuits; Transmitter circuits
    • H04L27/366—Arrangements for compensating undesirable properties of the transmission path between the modulator and the demodulator

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Abstract

The embodiment of the invention provides a power amplifying device based on polar modulation, which comprises: the decoder is used for acquiring the quantization error of the power amplification module according to the amplitude signal of the modulation signal to be transmitted and the resolution of the power amplification module and sending the quantization error to the jitter generator; the jitter generator is used for generating a second control signal according to the quantization error and sending the second control signal to the power amplification module; and the power amplification module is used for generating a jitter signal according to the second control signal to eliminate the quantization error so as to amplify the modulation signal to be transmitted. The power amplifier has the advantages that the jitter generator is added, the power amplifier module is controlled by the jitter generator according to the quantization error to generate jitter signals, the quantization error is eliminated, the resolution of the power amplifier is improved under the condition that only one power amplifier subunit is added, and the structure is simple.

Description

Power amplifying device based on polar modulation
Technical Field
The embodiment of the invention relates to the technical field of communication, in particular to a power amplification device based on polar modulation.
Background
In recent years, with the increasing demand for communication rate, a wireless communication system must meet the demand of people under a limited bandwidth, which results in that the modulation mode of the system is more and more complex, and the peak-to-average ratio of the corresponding modulation signal is also more and more high. The traditional linear power amplifier can only satisfy large amplitude transformation through power back-off for signals with high peak-to-average ratio. This results in a drastic reduction in the efficiency of the power amplifier. For this reason, it has been proposed to implement linear amplification using a switch-type nonlinear power amplifier. The nonlinear power amplifier works in two states of a switch, and has high efficiency. The nonlinear power amplifier generally uses a polar modulation method.
In a typical non-linear power amplifier scheme using a polar modulation mode, a power amplifier is composed of a series of power amplifier subunits connected in parallel, and whether the power amplifier subunits work is controlled by a value of a decoder. The I, Q baseband signals are first converted into amplitude and phase signals. The phase signal is used as a driving signal to drive the on-off of the switch type nonlinear power amplifier; the amplitude signal controls the number of the working power amplification subunits after decoding. The number of the working power amplification subunits is different, so that the output driving current is changed, and signals with different amplitudes are generated.
According to the power amplifier system based on the polar modulation, the amplitude modulation precision depends on the number of the power amplifier subunits, and the more the number is, the more the amplitude change is fine, and the more accurate the amplitude change is. However, the more the number of subunits is, the more complicated the control module is, and the overall efficiency is reduced; and more subunits are more difficult to guarantee consistency.
Disclosure of Invention
Embodiments of the present invention provide a polar modulation based power amplifying device that overcomes or at least partially solves the above problems.
The embodiment of the invention provides a power amplification device based on polar modulation, which comprises: the device comprises a decoder, a jitter generator and a power amplifier module, wherein the decoder, the jitter generator and the power amplifier module are sequentially connected; wherein the content of the first and second substances,
the decoder is used for generating a first control signal according to the amplitude signal of the modulation signal to be transmitted and the resolution of the power amplification module, acquiring the quantization error of the power amplification module according to the amplitude signal of the modulation signal to be transmitted and the resolution of the power amplification module, sending the first control signal to the power amplification module, and sending the quantization error to the jitter generator;
the jitter generator is used for generating a second control signal according to the quantization error and sending the second control signal to the power amplification module;
the power amplification module is used for controlling the amplification factor of the power amplification module according to the first control signal and generating a jitter signal according to the second control signal to eliminate the quantization error so as to finish the amplification of the modulation signal to be transmitted.
The power amplifier module comprises at least two power amplifier subunits, and the at least two power amplifier subunits are connected in parallel; the jitter generator is connected with any one of the at least two power amplifier subunits and used for sending the second control signal to any one of the at least two power amplifier subunits so as to control the on-off of any one of the at least two power amplifier subunits.
The decoder is connected with other power amplifier subunits in the at least two power amplifier subunits respectively and used for sending the first control signal to the other power amplifier subunits in the at least two power amplifier subunits respectively so as to control the on-off of the other power amplifier subunits and further control the amplification factor of the power amplifier module.
When the second control signal is at a high level, any one power amplifier subunit is conducted; and when the second control signal is at a low level, any one power amplifier subunit is switched off.
Wherein the jitter generator comprises a look-up table and a counter; wherein the content of the first and second substances,
the lookup table is used for acquiring the counting times of a counter corresponding to the period of the jitter signal and the counting times of the counter corresponding to the conduction time of any one power amplifier subunit in the period of the jitter signal according to the quantization error, and sending the counting times to the counter;
the counter is used for outputting the second control signal according to the counting times of the counter corresponding to the period of the jitter signal and the counting times of the counter corresponding to the conduction time of any one power amplifier subunit in the period of the jitter signal.
The lookup table stores a corresponding relationship between the quantization error and the counting number of the counter corresponding to the period of the dither signal, and a corresponding relationship between the quantization error and the counting number of the counter corresponding to the conduction time of any one power amplifier subunit in the period of the dither signal.
The quantization error, the counting number of the counter corresponding to the period of the dither signal and the counting number of the counter corresponding to the conduction time of any one power amplifier subunit in the period of the dither signal satisfy the following relations:
Figure BDA0001452275530000031
wherein A is 2For quantization error, Δ A is the power amplifier module resolution, k 1The number of times, k, counted by a counter corresponding to the conduction time of any one power amplifier subunit in one period of the jitter signal 1+k 2The number of times is counted by a counter corresponding to the period of the jitter signal, and k 1、k 2Is an integer, if k 1、k 2K is determined such that the values of (A) cannot make both sides of the above formula equal 1、k 2The value that minimizes the absolute value of the difference between the two sides of the above equation is taken.
Wherein, the counter corresponding to the period of the jitter signal counts the number of times k 1+k 2Cannot be infinitely large.
The power amplification device further comprises a filter, wherein the input end of the filter is connected with the output end of the power amplification module and used for performing band-pass filtering on the amplified to-be-transmitted modulation signal output by the power amplification module.
The power amplification device further comprises a driving module, wherein the output end of the driving module is connected with the input end of the power amplification module, and the driving module is used for driving the power amplification module.
According to the power amplification device based on polar modulation provided by the embodiment of the invention, the jitter generator is added, the power amplification module is controlled by the jitter generator according to the quantization error to generate the jitter signal, the quantization error is eliminated, the resolution of the power amplification device is improved under the condition that only one power amplification subunit is added, and the structure is simple.
Drawings
Fig. 1 is a schematic structural diagram of a power amplifying device based on polar modulation according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating a structure of a jitter generator according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another power amplifying device based on polar modulation according to an embodiment of the present invention;
FIG. 4 is a diagram of an embodiment of the present invention3, carrying out Matlab simulation on the amplifying device, when k is 1When the value is 0, obtaining an output oscillogram of each key point;
FIG. 5 shows Matlab simulation performed on the amplifying device shown in FIG. 3 according to an embodiment of the present invention, when k is 1＝k 2Obtaining an output oscillogram of each key point when the input voltage is 1;
FIG. 6 shows Matlab simulation performed on the amplifying device shown in FIG. 3 according to an embodiment of the present invention, when k is 1＝1，k 2When the value is 3, an output waveform diagram of each key point is obtained.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments, but not all embodiments, of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic structural diagram of a power amplification device based on polar modulation according to an embodiment of the present invention, and as shown in fig. 1, the power amplification device includes: the device comprises a decoder 1, a jitter generator 2 and a power amplifier module 3, wherein the decoder 1, the jitter generator 2 and the power amplifier module 3 are sequentially connected. Wherein:
the decoder 1 is configured to generate a first control signal according to an amplitude signal of a modulation signal to be transmitted and a resolution of the power amplifier module 3, acquire a quantization error of the power amplifier module 3 according to the amplitude signal of the modulation signal to be transmitted and the resolution of the power amplifier module 3, send the first control signal to the power amplifier module 3, and send the quantization error to the jitter generator 2. The jitter generator 2 is configured to generate a second control signal according to the quantization error, and send the second control signal to the power amplifier module 3. The power amplifier module 3 is configured to control the amplification factor of the power amplifier module 3 according to the first control signal, and generate a dither signal according to the second control signal to eliminate the quantization error, so as to complete amplification of the modulation signal to be transmitted.
The resolution of the power amplifier module 3 refers to an input amplitude value corresponding to each power amplifier subunit in the power amplifier module 3, the input amplitude value corresponding to each power amplifier subunit is determined by the number of the power amplifier subunits, and the basic strategy is to ensure that the maximum value that the amplitude of the input signal can reach is represented when all the power amplifier subunits are switched on, and the input amplitude value corresponding to each power amplifier subunit is obtained by dividing the maximum value of the input signal at the moment by the number of all the switched-on power amplifier subunits. The more the number of the power amplifier subunits is, the smaller the corresponding input amplitude value is, and the higher the resolution of the corresponding power amplifier module 3 is. The quantization error of the power amplifier module 3 is the difference between the actual amplitude of the modulation signal to be transmitted and the sum of the amplitudes corresponding to the power amplifier subunits controlled and conducted by the decoder 1.
When the existing power amplification device based on polar modulation amplifies the amplitude of a modulation signal, if quantization errors exist, the resolution of the power amplification module 3 needs to be improved by increasing the number of power amplification subunits, so that the quantization errors are eliminated. However, the more the number of the power amplifier subunits is, the more complicated the corresponding control module is, and the overall efficiency of the power amplifier device is low. Therefore, the technical scheme provided by the embodiment of the invention is as follows: under the condition of not increasing the number of the power amplification subunits, the jitter generator 1 is added, and a jitter signal is generated in the power amplification module 3 so as to reduce or eliminate quantization errors.
Specifically, the device also comprises a signal input module 7 and a polar coordinate signal generator 6, wherein the signal input module 7 is used for inputting a modulation signal to be transmitted, the signal is generally expressed by using Cartesian coordinates, and comprises I, Q orthogonal signals. The polar signal generator 6 is arranged to convert the signal represented in cartesian coordinates into a polar representation. The decoder compares the amplitude signal of the modulation signal to be transmitted sent from the polar coordinate signal generator 6 with the amplitude sum corresponding to the power amplifier subunit controlled to be switched on by the decoder, and obtains the difference between the amplitude signal of the modulation signal to be transmitted and the amplitude sum corresponding to the power amplifier subunit controlled to be switched on by the decoder, wherein the difference is the quantization error. In practical operation, the number of power amplifier subunits controlled by the decoder needs to be determined according to the amplitude signal of the modulation signal to be transmitted.
And then the quantization error is sent to a jitter generator, the jitter generator generates a second control signal according to the quantization error, the second control signal is sent to a power amplifier module, and the power amplifier module generates a jitter signal according to the second control signal so as to eliminate the quantization error. The whole process is the process that the jitter generator controls the power amplification module to generate jitter signals according to the quantization errors to eliminate the quantization errors. In the process, the number of the power amplifier subunits does not need to be increased, so that the device is simple in structure.
According to the power amplification device based on polar modulation provided by the embodiment of the invention, the jitter generator is added, the power amplification module is controlled by the jitter generator according to the quantization error to generate the jitter signal, the quantization error is eliminated, the resolution of the power amplification device is improved under the condition that only one power amplification subunit is added, and the structure is simple.
Based on the above embodiment, as shown in fig. 1, the power amplifier module includes at least two power amplifier subunits, and the at least two power amplifier subunits are connected in parallel; the jitter generator is connected with any one of the at least two power amplifier subunits and used for sending the second control signal to any one of the at least two power amplifier subunits so as to control the on-off of any one of the at least two power amplifier subunits.
Specifically, the number of power amplifier subunits in the power amplifier module is determined according to the amplitude value of the modulation signal to be transmitted. When the amplifying device provided by the embodiment of the invention is often used for amplifying a modulation signal to be transmitted in a certain amplitude range, a reasonable number of power amplification subunits can be correspondingly arranged.
The jitter generator only needs to be connected with one power amplifier subunit in the power amplifier module, and it can also be understood that the jitter generator only needs to control one power amplifier subunit in the power amplifier module to generate a jitter signal to eliminate the quantization error. During specific implementation, the jitter generator generates a jitter signal by controlling the on-off of the power amplifier subunit connected with the jitter generator according to the first control information, and the jitter signal is superposed with the output signals of other power amplifier subunits connected in parallel to eliminate the quantization error.
According to the embodiment of the invention, the jitter generator controls the on-off of any power amplifier submodule in the power amplifier module according to the second control signal to generate the jitter signal, so that the quantization error is eliminated under the condition of not increasing the number of the power amplifier subunits, and the resolution of the power amplifier is improved.
Based on the above embodiment, the decoder is connected to the other power amplifier subunits of the at least two power amplifier subunits, and is configured to send the first control signal to the other power amplifier subunits of the at least two power amplifier subunits, respectively, so as to control on/off of the other power amplifier subunits.
Based on the above embodiment, when the second control signal is at a high level, the any one power amplifier subunit is turned on; and when the second control signal is at a low level, any one power amplifier subunit is switched off.
Based on the above embodiment, the jitter generator includes the lookup table 21 and the counter 22, as shown in fig. 2. Wherein:
the lookup table 21 is configured to obtain, according to the quantization error, the number of times counted by a counter corresponding to the period of the dither signal and the number of times counted by the counter corresponding to the on-time of any one of the power amplifier subunits in the period of the dither signal, and send the obtained number of times counted by the counter to the counter. The counter 22 is configured to output the second control signal according to the count number of the counter corresponding to the period of the jitter signal and the count number of the counter corresponding to the on-time of any one of the power amplifier subunits in the period of the jitter signal.
Based on the above embodiment, the lookup table stores a corresponding relationship between the quantization error and the count number of the counter corresponding to the period of the dither signal, and a corresponding relationship between the quantization error and the count number of the counter corresponding to the on-time of any one power amplifier subunit in the period of the dither signal.
By pre-storing the correspondence in a look-up table, the power amplifier can be made more efficient in actual operation.
Based on the above embodiment, the quantization error, the count number of the counter corresponding to the period of the dither signal, and the count number of the counter corresponding to the on-time of the arbitrary power amplifier subunit in the period of the dither signal satisfy the following relationship:
Figure BDA0001452275530000071
wherein A is 2For quantization error, Δ A is the power amplifier module resolution, k 1The number of times, k, counted by a counter corresponding to the conduction time of any one power amplifier subunit in one period of the jitter signal 1+k 2The number of times is counted by a counter corresponding to the period of the jitter signal, and k 1、k 2Is an integer, if k 1、k 2K is determined such that the values of (A) cannot make both sides of the above formula equal 1、k 2The value that minimizes the absolute value of the difference between the two sides of the above equation is taken.
Specifically, the carrier frequency of the modulation signal to be transmitted is recorded as ω cThe carrier period is T and the phase is phi. The on-off period of any power amplifier subunit connected with the jitter generator is (k) 1+k 2) T, wherein any one of the power amplifier subunits is at k 1Is turned on for T time, at k 2And turning off within T time. The turn-off corresponding amplitude of any power amplification subunit is A 1The overall output amplitude corresponding to conduction is A 1+ Δ a, the overall output amplitude corresponding to the turn-off is a 1And delta A represents the corresponding output amplitude of one power amplifier subunit. Any power amplifier subunit connected with the jitter generator has a working on-off period of (k) 1+k 2) T, turning on and off the corresponding rf signals is expressed as:
u 1＝(A 1+ΔA)cos(ω ct+φ)
u 2＝A 1cos(ω ct+φ)
the switch power amplifier can convert sinusoidal signals into corresponding square signals in actual work, then outputs and filters out higher harmonics through band-pass filtering, only retains fundamental waves, and directly expresses the fundamental waves without considering the harmonic problem for the convenience of analysis. Then the square wave signal is defined as:
Figure BDA0001452275530000081
then the output signal of the power amplifier module is:
u＝u 1δ+u 2(1-δ)
＝(A 1+ΔA)cos(ω ct+φ)·δ+A 1cos(ω ct+φ 2)·(1-δ)
the taylor series of δ is represented as:
Figure BDA0001452275530000082
substituting the Taylor series of δ into the output signal expression yields:
Figure BDA0001452275530000091
wherein, remove
Figure BDA0001452275530000092
Besides, the rest parts are high-frequency and low-frequency noise which are filtered after passing through a filter, and the output of the whole system is as follows:
it follows that by increasing the amplitude jitter, the accuracy of the amplitude modulation can be increased, the increased portion of the accuracy corresponding to And the duty ratio is proportional to the conduction time of the jitter power amplification unit.
Therefore can adopt
Figure BDA0001452275530000095
To calculate the quantization error and k 1And k 1+k 2The corresponding relation between them. In actual calculation, if k 1、k 2K is determined such that the values of (A) cannot make both sides of the above formula equal 1、k 2The value that minimizes the absolute value of the difference between the two sides of the above equation is taken.
Further, the period of the jitter signal corresponds to the counting number k of the counter 1+k 2Cannot be infinitely large.
Specifically, among the high-frequency and low-frequency components, the component closest to the carrier frequency is
Figure BDA0001452275530000101
In order to prevent the phase jitter from bringing in-band noise, the jitter generator must be guaranteed when it is designed
Figure BDA0001452275530000102
Outside the passband of the system. The requirement k 1+k 2And the amplitude jitter cannot be infinitely large, so that the capability of improving the amplitude precision of the amplitude jitter is limited.
Furthermore, the power amplifying device further comprises a filter 4, wherein an input end of the filter 4 is connected with an output end of the power amplifier module 3, and the filter 4 is used for performing band-pass filtering on the amplified modulation signal to be transmitted, which is output by the power amplifier module 3.
Furthermore, the power amplification device further comprises a driving module 5, an output end of the driving module 5 is connected with an input end of the power amplification module 3, and the driving module 5 is used for driving the power amplification module 5.
The following further illustrates the beneficial effects of the power amplifying device based on polar modulation provided by the embodiment of the present invention through a simulation example.
The Matlab is used to verify the embodiment of the invention, the Matlab simulation model is as shown in FIG. 3, in order to simplify the model, the number of power amplification subunits in the power amplification module is 1, and meanwhile, a jitter power amplification subunit is provided. Assuming that the period of the carrier signal is T, the gain of one power amplifier subunit is 10, assuming that the input amplitude of the power amplifier subunit is 1, the output amplitude is 10, and the power amplifier output signal has gain loss after passing through the filter, and ideally, the gain of the output amplitude corresponding to the corresponding filtered power amplifier subunit is U-6.365. Four points A, B, C and D in the model were selected as keypoints to validate embodiments of the invention.
As shown in fig. 4, when k is 1When the value is 0, the dither power amplifier subunit is always turned off, and the amplitude of the system output signal at each key point of the system is U (6.365) as shown in fig. 4. Three of which A, B, C are shown here for convenience of illustration, only square waves.
As shown in fig. 5, when k is 1＝k 2And 1, the jitter power amplification subunit has on and off times of T and T in one jitter period. The waveform at each key point of the system is shown in fig. 5, and the amplitude of the system output signal is 1.5U (9.548).
As shown in fig. 6, when k is 1＝1，k 2And 3, the jitter power amplification subunit has the on and off time of T and 3T in one jitter period. The waveform at each key point of the system is shown in fig. 6, and the amplitude of the system output signal is 1.25U (7.956).
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (8)

1. A power amplifying device based on polar modulation, the power amplifying device comprising: the device comprises a decoder, a jitter generator and a power amplifier module, wherein the decoder, the jitter generator and the power amplifier module are sequentially connected; wherein the content of the first and second substances,
the decoder is used for generating a first control signal according to the amplitude signal of the modulation signal to be transmitted and the resolution of the power amplification module, acquiring the quantization error of the power amplification module according to the amplitude signal of the modulation signal to be transmitted and the resolution of the power amplification module, sending the first control signal to the power amplification module, and sending the quantization error to the jitter generator;
the jitter generator is used for generating a second control signal according to the quantization error and sending the second control signal to the power amplification module;
the power amplification module is used for controlling the amplification factor of the power amplification module according to the first control signal and generating a jitter signal according to the second control signal to eliminate the quantization error so as to finish the amplification of the modulation signal to be transmitted;
the power amplifier module comprises at least two power amplifier subunits, and the at least two power amplifier subunits are connected in parallel; the jitter generator is connected with any one of the at least two power amplifier subunits and is used for sending the second control signal to any one of the at least two power amplifier subunits so as to control the on-off of any one of the at least two power amplifier subunits;
the decoder is connected with other power amplifier subunits in the at least two power amplifier subunits respectively and is used for sending the first control signal to other power amplifier subunits in the at least two power amplifier subunits respectively so as to control the on-off of the other power amplifier subunits and further control the amplification factor of the power amplifier module.
2. The power amplifier device according to claim 1, wherein when the second control signal is at a high level, the any one of the power amplifier sub-units is turned on; and when the second control signal is at a low level, any one power amplifier subunit is switched off.
3. The power amplifying device according to claim 1, wherein the jitter generator includes a look-up table and a counter; wherein the content of the first and second substances,
the lookup table is used for acquiring the counting times of a counter corresponding to the period of the jitter signal and the counting times of the counter corresponding to the conduction time of any one power amplifier subunit in the period of the jitter signal according to the quantization error, and sending the counting times to the counter;
the counter is used for outputting the second control signal according to the counting times of the counter corresponding to the period of the jitter signal and the counting times of the counter corresponding to the conduction time of any one power amplifier subunit in the period of the jitter signal.
4. The power amplifier according to claim 3, wherein the look-up table stores a correspondence between the quantization error and a count number of the counter corresponding to a period of the dither signal, and a correspondence between the quantization error and a count number of the counter corresponding to a turn-on time of the arbitrary power amplifier subunit within the period of the dither signal.
5. The power amplifier device according to claim 4, wherein the quantization error, the count of the counter corresponding to the period of the dither signal, and the count of the counter corresponding to the on-time of any one of the power amplifier sub-units in the period of the dither signal satisfy the following relationship:
Figure FDA0002210916800000021
wherein A is 2For quantization error, Δ A is the power amplifier module resolution, k 1The number of times, k, counted by a counter corresponding to the conduction time of any one power amplifier subunit in the period of the jitter signal 1+k 2The number of times is counted by a counter corresponding to the period of the jitter signal, and k 1、k 2Is an integer, if k 1、k 2K is determined such that the values of (A) cannot make both sides of the above formula equal 1、k 2Get and make the above-mentionedThe value at which the absolute value of the difference between the two sides of the equation is the smallest.
6. The power amplifier according to claim 5, wherein the period of the jitter signal corresponds to a counter count k 1+k 2Cannot be infinitely large.
7. The power amplifier device according to claim 1, further comprising a filter, wherein an input terminal of the filter is connected to an output terminal of the power amplifier module, and the filter is configured to perform band-pass filtering on the amplified modulation signal to be transmitted output by the power amplifier module.
8. The power amplifier device according to claim 1, further comprising a driving module, wherein an output terminal of the driving module is connected to an input terminal of the power amplifier module, and the driving module is configured to drive the power amplifier module.
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