KR101840536B1 - Apparatus and method of processing an envelope signal - Google Patents

Apparatus and method of processing an envelope signal Download PDF

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KR101840536B1
KR101840536B1 KR1020160031810A KR20160031810A KR101840536B1 KR 101840536 B1 KR101840536 B1 KR 101840536B1 KR 1020160031810 A KR1020160031810 A KR 1020160031810A KR 20160031810 A KR20160031810 A KR 20160031810A KR 101840536 B1 KR101840536 B1 KR 101840536B1
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South Korea
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signal
envelope
envelope signal
input
gain control
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KR1020160031810A
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Korean (ko)
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KR20170108241A (en
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장승현
박봉혁
이희동
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한국전자통신연구원
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
    • H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
    • H03F1/0211—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers with control of the supply voltage or current
    • H03F1/0216—Continuous control
    • H03F1/0222—Continuous control by using a signal derived from the input signal
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
    • H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
    • H03F1/0211—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers with control of the supply voltage or current
    • H03F1/0244—Stepped control
    • 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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/411—Indexing scheme relating to amplifiers the output amplifying stage of an amplifier comprising two power stages

Abstract

There is provided a signal processing apparatus for determining an amplification gain applied to an envelope signal according to a difference value between an input signal and an output signal of a power amplifier. The signal processing apparatus includes a calculator for calculating a difference value between magnitudes of amplitudes between an input signal and an output signal of the power amplifier to generate a gain control signal and an envelope signal of the input signal according to the gain control signal, And an amplification unit for adjusting a magnitude of the envelope signal.

Figure R1020160031810

Description

[0001] APPARATUS AND METHOD OF PROCESSING AN ENVELOPE SIGNAL [0002]

To envelope signal processing apparatus and methods, and more particularly to envelope signal processing apparatus and methods associated with power amplifiers including envelope tracking modulators.

Standard techniques for next generation wireless communication systems such as Long Term Evolution (LTE), Worldwide Interoperability for Microwave Access (WiMAX), and Wireless Broadband Internet (WiBro) are defined based on OFDM (Orthogonal Frequency Division Multiplexing). However, the OFDM-based transmitter exhibits a high peak to average power ratio (PAPR) characteristic, and the power amplifier can not operate efficiently.

Various methods such as Doherty amplifiers, Envelope Elimination and Restoration (EER) amplifiers, and Envelope Tracking (ET) amplifiers are being studied to increase the efficiency of power amplifiers.

In the case of the envelope tracking amplifier, a power amplifier similar to the envelope of the input signal of the power amplifier is input to the power amplifier, and the power amplifier is always operated in the saturation region. However, there is a limit to be improved in that there is a need to adjust the synchronization between the signal generator for the input signal of the power amplifier and the envelope tracking modulator, and the synchronization between the power amplifier and the input signal of the power amplifier do.

JP 5638132 B2

According to one aspect, there is provided a signal processing apparatus for determining an amplification gain applied to an envelope signal according to a difference value between an input signal and an output signal of a power amplifier. The signal processing apparatus includes a calculator for calculating a difference value between magnitudes of amplitudes between an input signal and an output signal of the power amplifier to generate a gain control signal and an envelope signal of the input signal according to the gain control signal, And an amplification unit for adjusting a magnitude of the envelope signal.

According to an embodiment, the calculation unit may calculate a difference value between amplitude magnitudes of the envelope signal of the output signal and the envelope signal of the input signal. In addition, the calculator may calculate a time interval at which the difference value is equal to or greater than a predetermined threshold value, and generate the gain control signal corresponding to the time interval.

According to another embodiment, the calculating unit may generate the gain control signal corresponding to the magnitude of the difference value, and the amplifying unit may determine the magnitude of the gain according to the gain control signal.

According to another embodiment, the calculating unit generates the gain control signal based on a change in the difference value with time, and the amplifying unit changes the gain based on a change in the gain control signal with respect to time .

According to another embodiment, the signal processing apparatus may further include a group delay compensation unit compensating a positive group delay generated in the envelope signal by the calculation unit and the amplification unit. In addition, the group delay compensator may generate a negative group delay in the envelope signal, the size of which is determined according to the slope of the phase response corresponding to the frequency of each of the calculation unit and the amplification unit.

According to another embodiment, the signal processing apparatus may further include an envelope modulator receiving the adjusted envelope signal and amplifying the power of the adjusted envelope signal so that the power amplifier operates in a linear region. In addition, the envelope modulator may output the amplified envelope signal to the power unit of the power amplifier.

According to another aspect, there is provided a signal processing apparatus for adjusting the magnitude of an envelope signal according to a gain control signal. The signal processing apparatus includes a transistor receiving an envelope signal; And a gain controller electrically connected to at least one node of the transistor and adjusting a magnitude of the envelope signal according to an input gain control signal. In addition, the gain control signal may be determined according to a difference value between an input signal and an output signal of the power amplifier using the envelope signal.

According to an embodiment, the gain control unit may include a variable resistor whose impedance is determined according to the gain control signal. In addition, the gain control unit may adjust the magnitude of the envelope signal based on the output resistance of the output terminal of the transistor and the magnitude of the variable resistor. The gain control unit may include the variable resistor implemented using a metal oxide semiconductor field effect transistor (MOSFET) transistor. In addition, the transistor may receive the envelope signal using either a differential input circuit or a single-ended circuit.

According to another aspect, there is provided a signal processing apparatus for generating a negative group delay in an envelope signal. The signal processing apparatus includes a determination unit that determines a frequency at which a negative group delay is generated in the envelope signal that is input, and a determination unit that is electrically connected to the determination unit and generates the negative group delay in the envelope signal at the determined frequency, And outputting it to a modulator. In addition, the input envelope signal may be amplified according to a difference value between an input signal and an output signal of the power amplifier.

According to one embodiment, the local delay includes an operational amplifier for generating the negative group delay, and the determination unit includes at least one resistor connected in parallel between the node to which the envelope signal is input and the inverting input node of the operational amplifier. And at least one capacitor. In addition, the local delay may determine the frequency of the envelope signal in which the negative group delay is generated according to the connection relationship of the at least one resistor and the capacitor included in the determination unit.

According to another embodiment, the local delay may include an operational amplifier for generating the negative group delay, and the determination unit may include a node for outputting the envelope signal in which the negative group delay is generated, And at least one resistor connected between the nodes.

FIGS. 1A, 1B, 1C and 1D are diagrams for explaining the operation of the calculation unit according to an embodiment.
2 is an exemplary diagram illustrating the operation of the signal processing apparatus according to one embodiment.
3 is an exemplary diagram illustrating the operation of the power amplifier according to one embodiment.
4 is a circuit diagram of an amplification unit according to an embodiment.
5 is a circuit diagram of a group delay compensator according to an embodiment.

Specific structural or functional descriptions of embodiments are set forth for illustration purposes only and may be embodied with various changes and modifications. Accordingly, the embodiments are not intended to be limited to the specific forms disclosed, and the scope of the disclosure includes changes, equivalents, or alternatives included in the technical idea.

The terms first or second, etc. may be used to describe various elements, but such terms should be interpreted solely for the purpose of distinguishing one element from another. For example, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

It is to be understood that when an element is referred to as being "connected" to another element, it may be directly connected or connected to the other element, although other elements may be present in between.

The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms "comprises ", or" having ", and the like, are used to specify one or more of the described features, numbers, steps, operations, elements, But do not preclude the presence or addition of steps, operations, elements, parts, or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the meaning of the context in the relevant art and, unless explicitly defined herein, are to be interpreted as ideal or overly formal Do not.

FIGS. 1A, 1B, 1C and 1D are diagrams for explaining the operation of the calculation unit according to an embodiment.

Referring to FIG. 1A, a calculation unit 100 included in a signal processing apparatus is shown. In addition, the first input signal 110 and the second input signal 120 input to the calculation unit 100 and the output signal 130 output from the calculation unit 100 are shown. According to an exemplary embodiment, the first input signal 110 may represent a radio frequency (RF) signal input to the power amplifier. According to another embodiment, the second input signal 120 may represent a signal output from the power amplifier. Power amplifiers herein may represent various types of amplifiers used to amplify the power of a transmitted signal on a wireless communication system.

1B, 1C and 1D, graphs of a first input signal 110, a second input signal 120, and an output signal 130 associated with the calculator 100 are shown. The X axis of the graph represents time (second), and the Y axis of the graph represents the amplitude.

Referring to FIG. 1B, the amplitude of the first input signal 110 over time is shown. More specifically, an envelope signal generated as a set of points tangent to the curve drawn by the input signal of the power amplifier may be input to the calculation unit 100 as the first input signal 110. The input signal of the power amplifier may represent a carrier modulated communication signal for wireless communication.

Referring to FIG. 1C, the amplitude of the second input signal 120 over time is shown. 1B, the envelope signal of the output signal of the power amplifier may be input to the calculation unit 100 as the second input signal 120. [ However, there is a difference between the waveforms of the first input signal 110 and the second input signal 120. The power amplifier amplifies the first input signal 110 to produce a second input signal 120. However, when the magnitude of the amplitude of the first input signal 110 is equal to or greater than a predetermined threshold value, the magnitude of the output power of the second input signal 120 output from the power amplifier is out of the linear region of the gain curve. In such a case, saturation occurs in the second input signal 120 within the power supply range of the power amplifier. Accordingly, in spite of the waveform of the first input signal 110, signal distortion may occur in a part of the waveform of the second input signal 120. The calculation unit 100 may calculate a difference value between amplitudes of the first input signal 110 and the second input signal 120.

Referring to FIG. 1D, an output signal 130 of the calculation unit 110 is shown, which is determined according to the magnitude difference between the amplitudes of the first input signal 110 and the second input signal 120. The output signal 130 represents the magnitude of the amplitude of the first input signal 110 and the second input signal 120 with time. The calculation unit 100 may generate the output signal 130 as a gain control signal for controlling the gain applied to the envelope signal. The envelope signal may represent a signal input to the power supply of the power amplifier. A more detailed description of the process of controlling the gain of the envelope signal according to the gain control signal generated by the calculation unit 100 will be described with reference to the drawings to be added below.

2 is an exemplary diagram illustrating the operation of the signal processing apparatus according to one embodiment.

2, the signal processing apparatus 200 includes an envelope signal extractor 210, an amplifier 220, a group delay compensator 230, an envelope modulator 240, a power amplifier 250, a signal distributor 260 And a calculation unit 270. [0033] FIG. The combination of the components of the above-mentioned signal processing apparatus 200 is merely exemplary and does not limit or limit the scope of other embodiments. For example, the signal processing apparatus 200 including the amplification unit 220 and the calculation unit 270 may be implemented. The signal processing apparatus 200 including the amplification unit 220, the group delay compensation unit 230, the envelope modulator 240, and the calculation unit 270 may be implemented.

The envelope signal extractor 210 can extract an envelope signal from an input signal input to the power amplifier 250. According to one embodiment, envelope signal extractor 210 may extract an envelope signal from a carrier modulated communication signal to perform wireless communication. Illustratively, the envelope signal extractor 210 may extract the envelope in such a way that the capacitor is charged by the edge of the communication signal through a circuit comprising at least one diode, resistor, and capacitor. It should be understood, however, that this is merely an exemplary description for the sake of understanding, and should not be construed as limiting or limiting the scope of other embodiments that implement the envelope signal extractor 210.

The amplification unit 220 can determine a gain applied to the envelope signal extracted by the envelope signal extractor 210 according to the transmitted gain control signal. In addition, the amplification unit 220 can adjust the magnitude of the envelope signal. The amplification unit 220 may determine the magnitude of the gain applied to the envelope signal according to the gain control signal transmitted from the calculation unit 270. The magnitude of the gain can be varied based on changes in the gain control signal over time.

The group delay compensating unit 230 may generate a negative group delay on the envelope signal transmitted from the amplifying unit 220. [ In other words, the group delay compensator 230 may compensate the positive group delay generated in the envelope signal by the envelope signal extractor 210 or the amplification unit 220. More specifically, the group delay compensator 230 generates a negative group delay, which is magnified according to the slope of the phase response corresponding to the frequency of each of the envelope signal extractor 210 or the amplification unit 220, to the envelope signal .

The envelope modulator 240 receives the envelope signal as an output signal of the group delay compensator 230 and amplifies the envelope signal power. The envelope modulator 240 may amplify the power of the envelope signal so that the power amplifier 250 operates in a linear region. In addition, the envelope modulator 240 can output the amplified envelope signal to the power source of the power amplifier 250. The power supply near the envelope signal in which the nonlinear characteristic of the power amplifier 250 is likely to occur can be added in accordance with the envelope signal output from the envelope modulator 240. Accordingly, the signal processing apparatus 200 can expect an effect of increasing the linearity of the power amplifier 250 while minimizing the additional power consumption.

The power amplifier 250 receives the output signal of the envelope modulator 240 to the power source and amplifies the power by using the carrier-modulated communication signal as an input signal. In addition, the signal distributor 460 generates a feedback structure that divides a portion of the output signal of the power amplifier 250 and inputs it to the calculator 470.

The calculation unit 270 may calculate a difference value between the first input signal and the second input signal and may generate the gain control signal according to the difference value. Also, the calculation unit 270 may transmit the generated gain control signal to the amplification unit 220. According to one embodiment, the first input signal may represent a carrier modulated communication signal input to the power amplifier 250. According to another embodiment, the second input signal may represent a portion of the output signal of the power amplifier 250 delivered by the signal distributor 260.

In addition, the calculation unit 270 may calculate the difference value between the amplitudes of the first input signal and the second input signal. According to one embodiment, the calculation unit 270 may calculate a time interval at which the difference value is equal to or greater than a predetermined threshold value, and generate a gain control signal corresponding to the calculated time interval. Accordingly, the amplifying unit 220 can greatly adjust the gain of the envelope signal inputted only when the difference value of the envelope signal is equal to or larger than the threshold value.

According to another embodiment, the calculation unit 270 may generate a gain control signal corresponding to the magnitude of the difference value. Accordingly, the amplifying unit 220 can adjust the magnitude of the applied gain according to the magnitude of the difference value of the envelope signal.

According to another embodiment, the calculation unit 270 may generate a gain control signal based on a change in a difference value over time. In this case, the amplifying unit 220 can change the gain based on the change of the gain control signal with time.

The envelope modulator 240 according to the present embodiment adjusts the envelope signal using the input signal and the output signal of the power amplifier 250 without shaping the envelope signal in the modem generating the communication signal such as the RF signal . Accordingly, the envelope modulator 240 is highly compatible with and supports the modem regardless of the manufacturer and manufacturing method, and the effect of operating the power amplifier in the linear region can be expected.

In addition, the signal processing apparatus 200 according to the present embodiment can be applied to a system structure in that an analog-to-digital converter or a digital-analog converter can be eliminated in that the modulation of the envelope signal is performed using an analog signal. And the effect of minimizing unnecessary power consumption can be expected.

3 is an exemplary diagram illustrating the operation of the power amplifier according to one embodiment.

Referring to FIG. 3, a power amplifier 300, an input unit 310 of a power amplifier, and a power supply unit 320 are illustrated. According to the nonlinear characteristic of the power amplifier 300, saturation may occur in the output signal in a section where the amplitude of the input communication signal is large. As described above, the envelope modulator 240 can input the amplified envelope signal to the power amplifier of the power amplifier. Therefore, when compared with the input signal applied to the input unit 310, a signal having the magnitude of the amplitude of the envelope signal increased by the gain magnitude can be input to the power unit 320. [ In other words, the envelope signal applied to the power supply unit 320 may indicate a shape in which the envelope signal applied to the input unit 310 is moved in parallel to the y-axis direction.

The transistors constituting the power amplifier 300 in the present embodiment can be designed so that the larger the magnitude of the signal applied to the power supply portion, the greater the overall gain of the transistor. Detailed description of the design Since the circuit corresponds to a straightforward matter to the experts in the technical field, a detailed description will be omitted.

Accordingly, the envelope signal amplified in the magnitude of the amplitude of the communication signal input to the input unit 310 of the power amplifier 300 can be input to the power unit 320 of the power amplifier 300. In this case, the power amplifier 300 can generate an output signal in which the linearity is further enhanced in accordance with the amplified envelope signal so that the signal distortion is reduced.

4 is a circuit diagram of an amplification unit according to an embodiment.

Referring to FIG. 4, the amplification unit 400 may include an input transistor 410 and a variable resistor 420. The amplification unit 400 can receive the envelope signal through the input terminal of the input transistor 410. [ The envelope signal may represent a signal extracted by an envelope signal extractor from a carrier modulated RF signal. The input transistor 410 can output an envelope signal whose amplitude is adjusted through the output terminal. The gain G 1 of the envelope signal determined by the input transistor 410 can be calculated by Equation 1 below.

Figure 112016025555586-pat00001

R o represents the impedance of the variable resistor 420, and R O, diff represents the impedance of the input transistor 410. In the equation (1), g m represents the conductance of the input transistor 410, R s represents the impedance of the variable resistor 420, Lt; / RTI > As shown in Equation 1, when the impedance magnitude R S of the variable resistor 420 connected to the input transistor 410 is adjusted, the degree to which the envelope signal is amplified can also be adjusted.

The variable resistor 420 may be electrically connected to at least one node of the input transistor 410. According to one embodiment, the variable resistor 420 may be electrically coupled to the source node of the input transistor 410. In addition, the variable resistor 420 receives the gain control signal, and the magnitude of the impedance R S can be determined according to the input gain control signal.

According to another embodiment, the variable resistor 620 may be implemented using additional metal oxide semiconductor field effect transistor (MOSFET) transistors. Illustratively, the MOSFET transistor has a structure in which the output resistance is determined according to the magnitude of an input gain control signal, and the impedance of the output resistor can be used as R S.

In the present embodiment, an embodiment is described in which the input terminal and the output terminal of the input transistor 410 are implemented as a differential input circuit, but this is merely exemplary description, and other implementations such as a single-ended circuit And will not limit or limit the scope of the examples.

5 is a circuit diagram of a group delay compensator according to an embodiment.

5, the group delay compensator 500 is electrically connected to a determiner 510 and a determining unit 510 for determining a frequency for generating a negative group delay in an envelope signal inputted thereto, And generating a negative group delay on the envelope signal and outputting the group delay to the envelope modulator. The military smoke 520 may include an operational amplifier that generates the negative group delay. In addition, the determining unit 510 may include a first capacitor C 1 511 and a first resistor R 1 512 connected in parallel between an input terminal to which an envelope signal is input and an inverting input node of the operational amplifier. In addition, the determining unit 510 may include a second resistor R 2 513 connected between an output terminal for outputting the envelope signal in which the negative group delay is generated and an inverting input node of the operational amplifier.

The local smoke 520 can determine a frequency of an envelope signal in which a negative group delay occurs according to at least one resistance included in the determiner 510 and a connection relationship between the capacitors. Although an embodiment is shown in this embodiment in which the first capacitor C 1 511, the first resistor R 1 712 and the second resistor R 2 513 are used, this does not limit or limit the scope of other embodiments It will be apparent to those skilled in the art that various changes and modifications can be made.

The relationship between the signal passing through the input terminal and the output terminal of the group delay compensator 500 can be calculated by Equation (2) below.

Figure 112016025555586-pat00002

The gain of the group delay compensator 500 according to the present embodiment is

Figure 112016025555586-pat00003
, The frequency is
Figure 112016025555586-pat00004
The gain is gradually increased.

An embodiment in which the input terminal and the output terminal of the group delay compensator 500 are implemented as a single-ended circuit is disclosed as an example only, Circuitry, and the like, without departing from the scope of the present invention.

The embodiments described above may be implemented in hardware components, software components, and / or a combination of hardware components and software components. For example, the devices, methods, and components described in the embodiments may be implemented within a computer system, such as, for example, a processor, a controller, an arithmetic logic unit (ALU), a digital signal processor, such as an array, a programmable logic unit (PLU), a microprocessor, or any other device capable of executing and responding to instructions. The processing device may execute an operating system (OS) and one or more software applications running on the operating system. The processing device may also access, store, manipulate, process, and generate data in response to execution of the software. For ease of understanding, the processing apparatus may be described as being used singly, but those skilled in the art will recognize that the processing apparatus may have a plurality of processing elements and / As shown in FIG. For example, the processing unit may comprise a plurality of processors or one processor and one controller. Other processing configurations are also possible, such as a parallel processor.

The software may include a computer program, code, instructions, or a combination of one or more of the foregoing, and may be configured to configure the processing device to operate as desired or to process it collectively or collectively Device can be commanded. The software and / or data may be in the form of any type of machine, component, physical device, virtual equipment, computer storage media, or device , Or may be permanently or temporarily embodied in a transmitted signal wave. The software may be distributed over a networked computer system and stored or executed in a distributed manner. The software and data may be stored on one or more computer readable recording media.

The method according to an embodiment may be implemented in the form of a program command that can be executed through various computer means and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions to be recorded on the medium may be those specially designed and configured for the embodiments or may be available to those skilled in the art of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks, and magnetic tape; optical media such as CD-ROMs and DVDs; magnetic media such as floppy disks; Magneto-optical media, and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine language code such as those produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

Although the embodiments have been described with reference to the drawings, various technical modifications and variations may be applied to those skilled in the art. For example, it is to be understood that the techniques described may be performed in a different order than the described methods, and / or that components of the described systems, structures, devices, circuits, Lt; / RTI > or equivalents, even if it is replaced or replaced.

Claims (18)

A calculation unit for calculating a difference value between magnitudes of amplitudes between an input signal and an output signal of the power amplifier and generating a gain control signal according to the calculated difference value; And
A gain control unit for determining a gain applied to an envelope signal of the input signal according to the input gain control signal and adjusting an amplitude of the envelope signal,
Lt; / RTI >
Wherein the calculation unit calculates a time interval at which a difference value between amplitude magnitudes of the envelope signal of the output signal and the envelope signal of the input signal becomes equal to or greater than a predetermined threshold value and generates the gain control signal during the time interval. The method according to claim 1,
Wherein the calculation unit calculates a difference value between amplitude magnitudes of the envelope signal of the output signal and the envelope signal of the input signal. delete The method according to claim 1,
Wherein the calculating unit generates the gain control signal corresponding to the magnitude of the difference value, and the amplifying unit determines the magnitude of the gain according to the gain control signal. The method according to claim 1,
Wherein the calculating unit generates the gain control signal based on a change in the difference value with time, and the amplifying unit changes the gain based on a change in the gain control signal over time. The method according to claim 1,
And a group delay compensating unit compensating a positive group delay generated in the envelope signal by the amplifying unit,
And a signal processing unit. The method according to claim 6,
Wherein the group delay compensator generates a negative group delay in the envelope signal whose magnitude is determined according to the slope of the phase response corresponding to the frequency of the amplification unit. The method according to claim 1,
An envelope modulator that receives the adjusted envelope signal and amplifies the power of the adjusted envelope signal such that the power amplifier operates in a linear region,
Further comprising: 9. The method of claim 8,
And the envelope modulator outputs the envelope signal amplified with the power to the power unit of the power amplifier. A transistor for receiving an envelope signal; And
A gain control unit that is electrically connected to at least one node of the transistor and adjusts the magnitude of the envelope signal according to an input gain control signal,
Lt; / RTI >
Wherein the gain control signal is generated during a time interval in which a magnitude difference between amplitude magnitudes of an envelope signal of an input signal of the power amplifier using the envelope signal and an envelope signal of the output signal is equal to or greater than a predetermined threshold value. 11. The method of claim 10,
Wherein the gain control unit includes a variable resistor whose impedance is determined according to the gain control signal. 12. The method of claim 11,
Wherein the gain control unit adjusts the magnitude of the envelope signal based on the output resistance of the output terminal of the transistor and the magnitude of the variable resistor. 12. The method of claim 11,
Wherein the gain controller includes the variable resistor implemented using a metal oxide semiconductor field effect transistor (MOSFET) transistor. 13. The method of claim 12,
Wherein the transistor receives the envelope signal using either a differential input circuit or a single-ended circuit. A determination unit for determining a frequency at which a negative group delay is generated in the envelope signal; And
And a delay unit that is electrically connected to the determination unit and generates the negative group delay in the envelope signal at the determined frequency and outputs the delayed negative group delay to the envelope modulator.
Lt; / RTI >
Wherein the envelope signal is amplified based on a gain control signal generated during a time interval in which a magnitude difference between magnitude magnitudes of an envelope signal of an input signal of the power amplifier and an envelope signal of the output signal is equal to or greater than a predetermined threshold value. 16. The method of claim 15,
And the determination unit includes at least one resistor and at least one capacitor connected in parallel between a node to which the envelope signal is input and an inverting input node of the operational amplifier, Wherein the signal processing unit comprises: 16. The method of claim 15,
And the determination unit includes at least one of a node outputting the envelope signal in which the negative group delay is generated and at least one of the nodes connected between the node outputting the envelope signal and the inverting input node of the operational amplifier. A signal processing apparatus comprising a resistor. 17. The method of claim 16,
Wherein the control unit determines the frequency of the envelope signal in which the negative group delay is generated according to a connection relationship between the at least one resistor and the capacitor included in the determination unit.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200059063A (en) * 2018-11-20 2020-05-28 국방과학연구소 supply modulator and power amplifier having thereof

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111490739B (en) * 2019-01-25 2023-09-26 杭州海康威视数字技术股份有限公司 Device and equipment for amplifying audio signal
KR20220005891A (en) 2020-07-07 2022-01-14 삼성전자주식회사 Communication appratus for supporting envelope tracking modulation and envelope delay optimization method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004304775A (en) * 2003-03-19 2004-10-28 Sanyo Electric Co Ltd Variable impedance circuit, variable gain type differential amplifier, multiplier, high frequency circuit, and differential distributed type amplifier
JP5638132B2 (en) * 2011-06-03 2014-12-10 京セラ株式会社 Transmitter and signal processing method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004304775A (en) * 2003-03-19 2004-10-28 Sanyo Electric Co Ltd Variable impedance circuit, variable gain type differential amplifier, multiplier, high frequency circuit, and differential distributed type amplifier
JP5638132B2 (en) * 2011-06-03 2014-12-10 京セラ株式会社 Transmitter and signal processing method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200059063A (en) * 2018-11-20 2020-05-28 국방과학연구소 supply modulator and power amplifier having thereof
KR102134892B1 (en) 2018-11-20 2020-08-26 국방과학연구소 supply modulator and power amplifier having thereof

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