WO2010089971A1 - 電力増幅器及び電力増幅方法 - Google Patents
電力増幅器及び電力増幅方法 Download PDFInfo
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- WO2010089971A1 WO2010089971A1 PCT/JP2010/000457 JP2010000457W WO2010089971A1 WO 2010089971 A1 WO2010089971 A1 WO 2010089971A1 JP 2010000457 W JP2010000457 W JP 2010000457W WO 2010089971 A1 WO2010089971 A1 WO 2010089971A1
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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
- H03F1/0227—Continuous control by using a signal derived from the input signal using supply converters
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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
- H03F1/32—Modifications of amplifiers to reduce non-linear distortion
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- 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
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
- H03F3/211—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only using a combination of several amplifiers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/24—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages
- H03F3/245—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages with semiconductor devices only
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/204—A hybrid coupler being used at the output of an amplifier circuit
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- 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
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/432—Two or more amplifiers of different type are coupled in parallel at the input or output, e.g. a class D and a linear amplifier, a class B and a class A amplifier
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/451—Indexing scheme relating to amplifiers the amplifier being a radio frequency amplifier
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2203/00—Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
- H03F2203/20—Indexing scheme relating to power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F2203/21—Indexing scheme relating to power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
- H03F2203/211—Indexing scheme relating to power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only using a combination of several amplifiers
- H03F2203/21142—Output signals of a plurality of power amplifiers are parallel combined to a common output
Definitions
- the present invention relates to a power amplifier and a power amplification method, and more particularly to a power amplifier and a power amplification method for amplifying a modulation signal including an amplitude modulation component and a phase modulation component.
- the power amplifier (Power ⁇ Amplifier: PA) used for wireless communication devices consumes power especially among communication devices. For this reason, improving the power efficiency of the power amplifier is regarded as an important issue for communication device development. In recent communication standards, amplitude modulation has become the mainstream for improving spectral efficiency. This amplitude modulation has severe requirements for signal distortion. Therefore, the power amplifier used in the communication device is operated in a high back-off (low input power) state in order to improve linearity. However, when performing a high back-off operation, there is a problem that the power efficiency of power amplification decreases.
- polar modulation technology has been actively proposed in recent years in order to solve the problem of coexistence of power efficiency and linearity of such a power amplifier.
- a polar modulator In the polar modulation technique, a polar modulator, an RF (Radio-Frequency) amplifier, and a power supply modulator are used.
- the polar modulator extracts an amplitude modulation component and a phase modulation component of a modulation signal (for example, transmission signal data).
- ET envelope Tracking
- EER envelope Elimination and Restoration
- the polar modulator outputs an RF (Radio Frequency) modulation signal in which an amplitude modulation component and a phase modulation component are superimposed on a carrier wave.
- the polar modulator outputs an RF modulation signal in which the phase modulation component of the extracted modulation components is superimposed on the carrier wave.
- the polar modulator outputs an amplitude modulation component among the extracted modulation components to the power supply modulator.
- the power supply modulator modulates the power supplied to the RF amplifier in accordance with the amplitude modulation component input from the polar modulator.
- the RF amplifier amplifies the RF modulation signal input from the polar modulator, and modulates and outputs the amplified RF modulation signal based on the power source modulated by the power source modulator.
- the power supplied to the RF amplifier is modulated according to the amplitude of the RF modulation signal input to the RF amplifier.
- the power supply modulator when performing power amplification of a modulated signal using polar modulation technology, high performance is required for the power supply modulator in order to increase the accuracy of the signal that is finally output.
- the power supply modulator has characteristics such as accurate broadband operation (high speed), output of large voltage and low noise signals over a wide operating range (wide dynamic range), and high power efficiency. It is required to satisfy. Thus, techniques for satisfying these characteristics are described in Patent Documents 1 to 5.
- the power amplifier 100 includes an error correction unit 113 that corrects a signal error of the pulse modulation unit 112.
- the pulse modulator 112 is implemented by a high power efficiency switching amplifier.
- the pulse modulation unit 112 supplies power to the RF amplifier 111.
- the error correction unit 113 corrects switching noise generated in the pulse modulation unit 112.
- the power amplifier 100 implements high power efficiency and wide dynamic range (low noise) characteristics by mounting the pulse modulation unit 112 and the error correction unit 113 with high power efficiency.
- FIG. 21 shows a block diagram of the pulse modulation unit 112, the error correction unit 113, and the low-pass filter 114 of the power amplifier 100.
- the pulse modulation unit 112 includes a pulse modulator 150, a switching amplifier 124, an attenuator 125, and an integrator 126
- the error correction unit 113 includes an error amplifier 131, an attenuator 133, and an addition.
- the device 132 is configured.
- the portion combining the pulse modulation unit 112 and the low-pass filter (LPF) 114 and the error amplifier 131 can be regarded as voltage sources that output a desired voltage by voltage feedback, respectively.
- the adder 132 is mounted as a capacitor and has a high-pass filter (HPF) characteristic. Therefore, it can be considered that the part combining the pulse modulation unit 112 and the LPF 114 operates as a low-frequency component voltage source, the error amplifier 131 operates as a high-frequency component voltage source, and the adder 132 operates as a high-pass filter. it can. That is, the circuit shown in FIG. 21 supplies a voltage obtained by synthesizing the voltage generated by the low-frequency component voltage source and the voltage generated by the high-frequency voltage source to the RF amplifier as a modulation power source.
- a voltage source having a low output impedance that is, a combination of the pulse modulation unit 112 and the low-pass filter 114 and the error amplifier 131 are connected in parallel, so that a short circuit occurs between these voltage sources.
- an adder (high-pass filter) 132 is inserted between the voltage sources, and a current flows between the voltage sources within a desired signal band (low frequency) with high power density. To prevent that.
- an adder (high-pass filter) 132 allows a current to flow outside the noisy desired signal band (high frequency).
- Patent Document 2 proposes a technique for avoiding the problems in Patent Document 1.
- a block diagram of the power amplifier 200 disclosed in Patent Document 2 is shown in FIG.
- a desired voltage is applied to the load 211 by the linear amplifier 202.
- the linear amplifier 202 is configured as a voltage follower type, and is operated as a voltage source having a low output impedance.
- a desired current is supplied from the switching amplifier 242 to the load 211.
- the switching amplifier 242 operates as a current source that outputs a desired current by performing pulse modulation control based on the detection current in the sense resistor 208 by the pulse modulator 236.
- the power amplifier 200 can be regarded as using the linear amplifier 202 as a voltage source and the switching amplifier 242 as a current source.
- the power amplifier 200 is connected in parallel and supplies power to a load (RF amplifier) by a voltage source and a current source. Further, the current Ilin from the voltage source is detected, and the output current Isw from the current source is controlled. Further, by using the linear amplifier 202 having a small error with respect to the load 211 as a voltage source, an error in the output voltage Vout can be suppressed. In addition, since most of the power is supplied from the high-efficiency switching amplifier 242, high power efficiency can be obtained. Furthermore, since the output of the current source has high impedance, no unnecessary power flows due to a short circuit between the voltage source and the current source.
- a method equivalent to Patent Document 2 is also disclosed in Patent Documents 3 and 4.
- a power amplifier 300 described in Patent Document 3 is shown in FIG.
- a circuit composed of the buffer amplifier circuit 310 and the class AB amplifier 322 is used as a voltage source, and a circuit composed of the current sensor 338, the pulse width modulator 340, and the DC / DC converter 324 is converted into a current. Used as a source.
- a block diagram of the power amplifier 400 described in Patent Document 4 is shown in FIG.
- the analog linear amplifier 405 is used as a voltage source
- the nonlinear amplifier 403 is used as a current source.
- the power amplifiers 300 and 400 like the power amplifier 200, supply most of the power from a high-efficiency current source, suppress errors in the output voltage Vout with a high-accuracy voltage source, and reduce the amount of error and power efficiency. To achieve both.
- Patent Document 5 discloses a power amplifier using a linear regulator that amplifies a low-frequency component amplitude modulation signal, a high-pass filter that amplifies a high-frequency component amplitude modulation signal, and a high-frequency signal amplifier.
- the signal accuracy is improved by synthesizing signals generated by the linear regulator and the high-frequency signal amplifier.
- the current source in the power supply modulator is mounted by a high power efficiency switching amplifier, and generates a large current to be supplied from this current source to the RF amplifier.
- a high-speed switching operation is difficult for a switching amplifier that supports a large current, and it is impossible to output a current that follows the high-frequency component of the output signal of the power supply modulator. Therefore, the current corresponding to the high frequency component must be output from a voltage source implemented by a low power efficiency linear amplifier. Therefore, in the power amplifiers described in Patent Documents 2 to 4, there is a problem that the power consumption of the voltage source in the power supply modulator becomes high.
- an object of the present invention is to reduce power consumption of a power amplifier.
- One aspect of the power amplifier according to the present invention is a power amplifier that amplifies a modulation signal including an amplitude modulation component and a phase modulation component, and amplifies a low-frequency component of the amplitude modulation component of the modulation signal, thereby A first voltage source that outputs a voltage; a second voltage source that amplifies a high-frequency component of the amplitude modulation component of the modulation signal and outputs a second voltage; and amplifies the amplitude component of the modulation signal A current source that outputs current; a combining circuit that combines the first voltage, the second voltage, and the current to generate a modulated power supply signal; and amplifies a signal in which the modulation signal is superimposed on a carrier wave; And an RF amplifier that amplitude-modulates and outputs the amplified signal by the modulation power source.
- One aspect of the power amplification method according to the present invention is a power amplification method for amplifying a modulation signal including an amplitude modulation component and a phase modulation component, wherein a first low frequency component is amplified by amplifying a low frequency component of the amplitude component of the modulation signal.
- a modulated power supply signal is generated by combining the second voltage and the current, a signal obtained by superimposing the modulated signal on a carrier wave is amplified, and the amplified signal is amplitude-modulated by the modulated power supply and output.
- the power amplifier and the power amplification method according to the present invention it is possible to reduce power consumption in the power amplifier while improving signal accuracy.
- 1 is a block diagram of a power amplifier according to a first exemplary embodiment.
- 1 is a block diagram of a power amplifier according to a first exemplary embodiment.
- 1 is a block diagram of a power supply modulator according to a first exemplary embodiment;
- 1 is a circuit diagram of a power supply modulator according to a first exemplary embodiment;
- FIG. 3 is an equivalent circuit diagram of a low frequency voltage source of the power supply modulator according to the first exemplary embodiment;
- FIG. 3 is an equivalent circuit diagram of a high-frequency voltage source of the power supply modulator according to the first exemplary embodiment.
- 3 is a comparative example of a power supply modulator for explaining the effect of the power supply modulator according to the first embodiment; 3 is a graph showing an output voltage waveform of the power supply modulator according to the first exemplary embodiment; 3 is a graph showing an output voltage waveform of a comparative example of the power supply modulator according to the first exemplary embodiment; 3 is a graph showing an output voltage waveform of a comparative example of the power supply modulator according to the first exemplary embodiment; 3 is a graph showing an output voltage waveform and an output current waveform of a high frequency voltage source of the power supply modulator according to the first exemplary embodiment; 3 is a graph showing an output voltage waveform and an output current waveform of a low frequency voltage source of the power supply modulator according to the first exemplary embodiment; 3 is a graph showing an output voltage waveform and an output current waveform of a comparative example of the power supply modulator according to the first exemplary embodiment; FIG.
- FIG. 6 is a circuit diagram showing a modification of the power supply modulator according to the first exemplary embodiment
- FIG. 3 is a circuit diagram of a power supply modulator according to a second exemplary embodiment.
- FIG. 6 is a circuit diagram showing a modification of the power supply modulator according to the second exemplary embodiment
- FIG. 6 is a circuit diagram of a power supply modulator according to a third exemplary embodiment.
- 10 is a graph showing a pulse modulation signal of a current source according to the third embodiment.
- 10 is a graph showing a modulated power supply signal output by the power supply modulator according to the third exemplary embodiment
- FIG. 10 is a circuit diagram showing a modification of the power supply modulator according to the third exemplary embodiment
- 2 is a block diagram of a power amplifier described in Patent Document 1.
- FIG. FIG. 6 is a circuit diagram of a pulse modulation unit, a filter, and an error correction unit described in Patent Document 1.
- 6 is a circuit diagram of a power amplifier described in Patent Document 2.
- FIG. 6 is a circuit diagram of a power amplifier described in Patent Document 3.
- FIG. 6 is a circuit diagram of a power amplifier described in Patent Literature 4.
- FIG. 1 shows a block diagram of a power amplifier 1 according to the present embodiment.
- the power amplifier shown in FIG. 1 performs power amplification by an ET (Envelope Tracking) method.
- the power amplifier 1 includes a polar modulator 10, a power supply modulator 20, and an RF (Radio Frequency) amplifier 30.
- the power amplifier 1 also has an input terminal 2, an output terminal 6, and terminals 3-5.
- the power amplifier 1 receives a modulated signal (data signal) to be transmitted through the input terminal 2 and outputs the amplified modulated signal from the output terminal 6.
- Polar modulator 10 and power supply modulator 20 are connected by terminal 3
- polar modulator 10 and RF amplifier 30 are connected by terminal 4
- power supply modulator 20 and RF amplifier 30 are connected by terminal 5.
- Polar modulator 10 extracts the amplitude modulation component and phase modulation component of the data signal. Then, the polar modulator 10a used in the ET system outputs the amplitude modulation component as an amplitude modulation signal to the power supply modulator 20 (or terminal 3), and superimposes the amplitude modulation component and the phase modulation component on the carrier wave. A modulation signal is generated, and the RF modulation signal is output to the RF amplifier 30 (or terminal 4). The polar modulator 10 outputs the RF modulation signal output to the RF amplifier 30 and the amplitude modulation component signal output to the power supply modulator 20 at separate timings.
- the power supply modulator 20 generates a modulated power supply signal obtained by modulating the power supply based on the amplitude modulation signal output from the polar modulator 10, and supplies the modulated power supply signal to the RF amplifier 30. Details of the power supply modulator 20 will be described later.
- the RF amplifier 30 operates based on the modulated power supply signal generated by the power supply modulator 20, amplifies the RF modulation signal output from the polar modulator 10, and outputs it from the output terminal 6. At this time, the RF amplifier 30 modulates the RF modulation signal with the modulation power supply signal.
- FIG. 2 a block diagram of the power amplifier 1a adopting the EER method is shown in FIG.
- a polar modulator 10 a is used instead of the polar modulator 10.
- the polar modulator 10a used in the EER system outputs the amplitude modulation component as an amplitude modulation signal to the power supply modulator 20 (or terminal 3), and generates the RF modulation signal by superimposing the phase modulation component on the carrier wave.
- the RF modulation signal is output to the RF amplifier 30 (or terminal 4). That is, in the ET method and the EER method, the polar modulator is different only in output signal from the RF amplifier, and both the power supply modulator and the RF amplifier can be the same.
- the power supply modulator 20 includes a first voltage source 21, a second voltage source 22, a synthesis circuit 23, and a current source 24.
- the first voltage source 21 amplifies the low frequency component of the amplitude modulation component of the amplitude modulation signal received from the polar modulator 10 and outputs the first voltage (for example, the low frequency amplitude modulation signal VC_L). Further, the first voltage source 21 outputs a low frequency error current IC_L corresponding to a low frequency component of the error current IC between the current supplied to the RF amplifier 30 and the current output from the current source 24. Therefore, in the following description, the first voltage source 21 is referred to as a low frequency voltage source.
- the second voltage source 22 amplifies the high frequency component of the amplitude modulation component of the amplitude modulation signal received from the polar modulator 10 and outputs a second voltage (for example, the high frequency amplitude modulation signal VC_H).
- the second voltage source 22 outputs a high-frequency error current IC_H corresponding to a high-frequency component among the error current IC between the current supplied to the RF amplifier 30 and the current output from the current source 24. Therefore, in the following description, the second voltage source 22 is referred to as a high frequency voltage source.
- the synthesizing circuit 23 synthesizes the low frequency amplitude modulation signal VC_L, the high frequency amplitude modulation signal VC_H, and the current IM output from the current source 24 to generate a modulation power supply signal VOUT, and the modulation power supply signal VOUT is output to the RF amplifier 30 (or terminal). Output to 5).
- the synthesis circuit 23 includes a low frequency pass filter (low pass filter: LPF) 25 and a high pass filter (high pass filter: HPF) 26.
- the low-pass filter 25 and the high-pass filter 26 are each set with a cutoff frequency that determines the pass bandwidth. In this embodiment, the low-pass filter 25 and the high-pass filter 26 These cutoff frequencies are set so that the passbands do not overlap.
- the current source 24 amplifies the amplitude modulation signal to generate the current IM and outputs it to the synthesis circuit 23.
- the current source 24 detects the amplitude level of the amplitude modulation signal VC obtained by synthesizing the low frequency amplitude modulation signal VC_L and the high frequency amplitude modulation signal VC_H in the synthesis circuit 23, and detects the detected voltage. A current IM corresponding to the level is generated.
- the amplitude modulation signal VC synthesized by the synthesis circuit 23 is equivalent to the amplitude modulation signal output from the polar modulator 10.
- the current source 24 according to the present embodiment uses a switching regulator.
- the current source 24 by providing the current source 24, the current output from the low frequency voltage source 21 and the high frequency voltage source 22 and the current consumed by the RF amplifier 30 are the same. Only the error current IC with the current IM output from the source 24 can be used. Thereby, the power consumption of the low frequency voltage source 21 and the high frequency voltage source 22 is reduced. Further, in the power supply modulator 20 according to the present embodiment, the voltage source includes a low frequency voltage source 21 that is required to output a high voltage and a high frequency voltage source 22 that is required to output a low voltage and operate at high speed. Configure.
- the current output from the current source 24 accurately follows the low frequency component and has a characteristic that the tracking accuracy is not high for the high frequency component. This is because the switching regulator (current source 24) outputs a large current, and is configured using a large-sized transistor that is difficult to perform a high-speed switching operation. For this reason, the low frequency error current IC_L out of the error current IC is much smaller than the high frequency error current IC_H. Therefore, in the power supply modulator 20 according to the present embodiment, the low frequency voltage source 21 has a high output voltage and a low output current, and the high frequency voltage source 22 has a low output voltage and a high output current. That is, in the power supply modulator 20 according to the present embodiment, the power source is not required to have a high output voltage and a high output current, and thus power consumption is reduced.
- the cutoff frequency of the low-pass filter 25 is set below the cutoff frequency of the high-pass filter 26, and the cutoff frequency of the low-pass filter 25 is In the preferred embodiment, the cutoff frequency of the high-pass filter 26 is preferably close. As a result, it is possible to reduce distortion of the combined amplitude modulation signal VC while preventing a short-circuit current from flowing between the low frequency voltage source 21 and the high frequency voltage source 22.
- FIG. 4 shows a circuit diagram of the power supply modulator 20.
- parts corresponding to those in the block diagram of FIG. 3 are denoted by the same reference numerals as those in FIG. 3, and description of the function of the blocks is omitted.
- the delay circuit 7 is inserted in front of the RF amplifier 30. This delay circuit 7 eliminates an error between the operation of the power supply modulator 20 and the RF modulation signal. The delay generated by the delay circuit 7 may be generated inside the polar modulator 10.
- the low frequency voltage source 21 has a low frequency signal source 31.
- the low frequency signal source 31 extracts a low frequency component from the amplitude modulation signal output from the polar modulator 10 and outputs a low frequency amplitude modulation signal VC_L.
- the low frequency signal source 31 outputs a low frequency error current IC_L corresponding to a low frequency component of the error current IC.
- the high frequency voltage source 22 includes a high frequency signal source 32 and a buffer circuit 33.
- the high frequency signal source 32 extracts a high frequency component from the amplitude modulation signal output from the polar modulator 10, and outputs a high frequency amplitude modulation signal VC_H.
- the buffer circuit 33 outputs the high frequency amplitude modulation signal VC_H output from the high frequency signal source 32 and also outputs the high frequency error current IC_H corresponding to the high frequency component of the error current IC.
- a buffer circuit 33 constituted by a voltage follower circuit is provided on the high frequency voltage source 22 side.
- the synthesizing circuit 23 includes a low-pass filter 25, a high-pass filter 26, and a resistor Rs.
- the low-pass filter 25 is connected between the output of the low-frequency voltage source 21 and the voltage synthesis node ND1.
- the low-pass filter 25 includes inductors L1 and L2 and a capacitor CL.
- the inductors L1 and L2 are connected in series between the output of the low frequency voltage source 21 and the voltage synthesis node ND1.
- Capacitor CL is connected between a node to which inductors L1 and L2 are connected to each other and a ground power supply terminal.
- the low-pass filter 25 passes only a signal in a band lower than the cutoff frequency determined by the inductors L1 and L2 and the capacitor CL.
- the high-pass filter 26 has a capacitor CH.
- the capacitor CH is provided between the output of the buffer circuit 33 of the high frequency voltage source 22 and the voltage synthesis node ND1.
- the cutoff frequency of the high pass filter 26 is determined by the capacitance value of the capacitor CH and the output impedance of the buffer circuit 33.
- the high-pass filter 26 passes a signal having a frequency higher than the cut-off frequency.
- the output terminal of the low-pass filter 25 and the output terminal of the high-pass filter 26 are connected to the voltage synthesis node ND1.
- the signal pass bands of the low pass filter 25 and the high pass filter 26 are set so as not to overlap.
- the low frequency amplitude modulation signal VC_L output from the low frequency voltage source 21 and the high frequency amplitude modulation signal VC_H output from the high frequency voltage source 22 are combined to generate an amplitude modulation signal VC.
- the error current IC is generated by synthesizing the low frequency error current IC_L output from the low frequency voltage source 21 and the high frequency error current IC_H output from the high frequency voltage source 22.
- the resistor Rs is provided between the voltage synthesis node ND1 and the voltage / current synthesis node ND2.
- the resistor Rs passes the error current IC input from one terminal (voltage synthesis node ND1 side), and the current IM and error current IC output from the current source 24 at the other terminal (voltage current synthesis node ND2 side). Is synthesized.
- the synthesized current IRL is supplied to the RF amplifier 30 via the terminal 5.
- the amplitude modulation signal VC synthesized at the voltage synthesis node ND1 is output to the terminal 5 via the resistor Rs.
- the voltage output to the terminal 5 corresponds to the modulation power supply signal VOUT in FIG.
- the current source 24 is composed of a switching regulator. This switching regulator detects the magnitude of the error current IC generated by the amplitude of the amplitude modulation signal VC by the resistor Rs, and generates a current IM corresponding to the amplitude modulation signal VC. More specifically, the current source 24 includes a resistor Rs, a pulse modulator 34, a low-side gate driver 35, a high-side gate driver 36, a first switching element (for example, PMOS transistor P1), and a second switching element (for example, , NMOS transistor N1) and an inductor element (for example, inductor L3).
- a switching regulator detects the magnitude of the error current IC generated by the amplitude of the amplitude modulation signal VC by the resistor Rs, and generates a current IM corresponding to the amplitude modulation signal VC. More specifically, the current source 24 includes a resistor Rs, a pulse modulator 34, a low-side gate driver 35, a high-side gate driver 36,
- the resistor Rs is used in common with the synthesis circuit 23 and detects the magnitude of the error current IC.
- the pulse modulator 34 generates a pulse modulation signal based on the voltage difference generated across the resistor Rs based on the error current IC.
- the low side gate driver 35 drives the NMOS transistor N1 based on the pulse modulation signal.
- the high side gate driver 36 drives the PMOS transistor P1 based on the pulse modulation signal.
- the PMOS transistor P1 and the NMOS transistor N1 are connected in series between the DC power supply terminal VDD and the ground power supply terminal.
- One end of an inductor L3 is connected to an output terminal (or connection node) at which the PMOS transistor P1 and the NMOS transistor N1 are connected to each other.
- the other terminal of the inductor L3 is connected to the terminal 5.
- a DC power supply is connected to the ground power supply terminal.
- the NMOS transistor N1 and the PMOS transistor P1 are controlled to be exclusively conducted by the low side gate driver 35 and the high side gate driver 36.
- the switching regulator outputs a signal obtained by amplifying the pulse modulation signal to one terminal of the inductor L3.
- the switching regulator also controls the current that is discharged from the DC power supply terminal to the inductor L3 and the current that is drawn from the inductor L3 to the ground terminal.
- the inductor L3 functions as a smoothing element.
- the inductor L3 outputs a current IM to the terminal 5. At this time, in the switching regulator, the current IM is generated by the feedback path through the resistor Rs so that the voltage difference between both ends of the resistor Rs becomes small.
- the current source 24 varies the magnitude of the current IM in accordance with the voltage of the amplitude modulation signal VC, and reduces the error current IC between the current IM and the current IRL supplied to the RF amplifier 30. Further, due to the characteristics of the switching regulator, the current IM has a high followability to the low frequency component of the amplitude modulation signal VC.
- FIG. 5 an equivalent circuit diagram of a circuit connected to the low frequency voltage source 21 is shown in FIG. 5, and an equivalent circuit diagram of a circuit connected to the high frequency voltage source 22 is shown in FIG.
- an RF amplifier 30 is connected to the low frequency voltage source 21 as a load.
- a two-stage low-pass filter is configured by the inductors L1 and L2 of the low-pass filter 25, the capacitor CL, and the capacitor CH of the high-pass filter 26. That is, the low-frequency amplitude modulation signal VC_L output from the low-frequency voltage source 21 is applied to the load via the two-stage low-pass filter. Further, as shown in FIG.
- an RF amplifier 30 is connected to the high frequency voltage source 22 as a load.
- a two-stage high-pass filter is configured by the capacitor CH of the high-pass filter 26, the inductors L1 and L2 of the low-pass filter 25, and the capacitor CL. That is, the high frequency amplitude modulation signal VC_H output from the high frequency voltage source 22 is applied to the load via the two-stage high-pass filter. That is, the low-pass filter 25 and the high-pass filter 26 according to the present embodiment constitute a high-order filter with a small number of elements depending on the connection form of the elements constituting these filters.
- the low-frequency signal source 31 and the high-frequency signal source 32 are synchronized with each other, and the output timing of the low-frequency amplitude modulation signal VC_L, the high-frequency amplitude modulation signal VC_H, and the pulse signal output from the pulse modulator 34 can be set to a desired value.
- By setting the output timing of the low-frequency amplitude modulation signal VC_L, the high-frequency amplitude modulation signal VC_H, and the pulse signal output from the pulse modulator 34 so as to correct the delay difference between the low-pass filter 25 and the high-pass filter 26.
- a voltage source 210 is provided instead of the low frequency voltage source 21 and the high frequency voltage source 22.
- the voltage source 210 includes a signal source 311 and a buffer circuit 312.
- the signal source 311 outputs the amplitude modulation signal VC received from the polar modulator 10.
- the buffer circuit 312 outputs the amplitude modulation signal VC output from the signal source 311 and outputs an error current IC.
- the buffer circuit 312 functions as an impedance converter for the signal source 311.
- the output voltage waveform of the power supply modulator 20 according to the present embodiment is compared with the output voltage waveform of the power supply modulator 20a according to the comparative example.
- 8 shows a graph of the output voltage waveform of the power supply modulator 20 according to the present embodiment
- FIG. 9 shows a graph of the output voltage waveform of the power supply modulator 20a according to the comparative example.
- the output voltage waveforms shown in FIGS. 8 and 9 are simulation results when the power supply modulator 20 and the power supply modulator 20a are operated under the same conditions. As shown in FIGS. 8 and 9, it can be seen that the output voltage waveforms of the power supply modulator 20 and the power supply modulator 20a accurately follow the ideal voltage waveform.
- the modulated power supply signal is generated with the same accuracy as when no filter or the like is inserted. It can be seen that it can be obtained. This is because the distortion of the combined amplitude modulation signal VC can be reduced by taking the cutoff frequency of the low-pass filter 25 and the cutoff frequency of the high-pass filter 26 close to each other.
- the power consumption of the power supply modulator 20 according to the present embodiment is compared with the power consumption of the power supply modulator 20a according to the comparative example.
- 10 shows a graph of the high-frequency amplitude modulation signal VC_H and the high-frequency error current IC_H output from the high-frequency voltage source 22 of the power supply modulator 20 according to the present embodiment
- FIG. 11 shows the power supply modulator according to the present embodiment.
- FIG. 12 shows a graph of the low frequency amplitude modulation signal VC_L and the low frequency error current IC_L output from the 20 low frequency voltage sources 21, and
- FIG. 12 shows a graph of the amplitude modulation signal VC and the error current IC output from the voltage source 210 according to the comparative example. Indicates.
- the maximum voltage of the high-frequency amplitude modulation signal VC_H is about 5 V, and the average current of the high-frequency error current IC_H is about 200 mA. Therefore, the power consumption of the high-frequency voltage source 22 is about 353 mW.
- the maximum voltage of the low frequency amplitude modulation signal VC_L is about 20 V, and the average current of the high frequency error current IC_H is several mA. For this reason, the power consumption of the low-frequency voltage source 21 is about 55 mW. That is, in the power supply modulator 20 according to the present embodiment, the sum of the power consumption of the low frequency voltage source 21 and the power consumption of the high frequency voltage source 22 is about 408 mW.
- the maximum voltage of the amplitude modulation signal VC is about 20 V
- the average current of the error current IC is about 200 mA. Therefore, the power consumption of the voltage source 210 is about 3.63 W. That is, in the comparative example, it is necessary to consume and output nine times as much power as the power supply modulator 20 according to the present embodiment.
- the power consumption of the voltage source can be greatly reduced by reducing the output power of the voltage source.
- the power supply modulator 20 separates the low-frequency voltage source 21 and the high-frequency voltage source 22 from the low-frequency voltage source 21 that outputs a high voltage from the high-frequency error current IC_H that occupies a large proportion of the error current IC. This is because the output is avoided.
- the magnitude of the low frequency error current IC_L output from the low frequency voltage source 21 is infinitely zero. Can be close to. That is, the current consumption of the low-frequency voltage source 21 that conventionally required large power consumption can be greatly reduced by separately providing the current source 24 and the high-frequency voltage source 22.
- the power supply modulator 20b is used instead of the power supply modulator 20.
- the power supply modulator 20 b includes a current source 24 a that is used in place of the current source 24 of the power supply modulator 20.
- the current source 24 a includes a pulse signal source 38 instead of the pulse modulator 34.
- the pulse modulator 38 has a function of calculating in advance and outputting the same pulse signal VG as the pulse signal output by the pulse modulator 34 of the power supply modulator 20.
- the pulse signal source 38 is synchronized with the low-frequency signal source 31 and the high-frequency signal source 32, and can output the low-frequency amplitude modulation signal VC_L, the high-frequency amplitude modulation signal VC_H, and the pulse signal VG to desired values.
- the resistor Rs may be removed and short-circuited, or may be installed.
- the pulse signal source 38 synchronized with the low frequency signal source 31 and the high frequency signal source 32, the output timing of the low frequency amplitude modulation signal VC_L, the high frequency amplitude modulation signal VC_H, and the pulse signal VG is adjusted.
- the error caused by the delay between the current IM output from the current source 24a and the amplitude modulation signal VC output from the synthesis circuit 23 can be corrected.
- the error current IC can be suppressed and the power consumption of the low frequency voltage source 21 and the high frequency voltage source 22 can be suppressed.
- Embodiment 2 A power supply modulator 40 according to the second embodiment shown in FIG. 14 will be described.
- the power supply modulator 40 is used in place of the power supply modulator 20.
- the power supply modulator 40 includes a current source 27 instead of the current source 24 of the power supply modulator 20.
- the current source 27 is a switching regulator using a transformer, and its function corresponds to the current source 24.
- the current source 27 includes a resistor Rs, a pulse modulator 34, a low-side gate driver 35, an NMOS transistor N1, a transformer 37, diodes D1 and D2, an inductor L3, and a DC power supply PWR1.
- the resistor Rs is used in common with the synthesis circuit 23 and detects the magnitude of the error current IC.
- the pulse modulator 34 generates a pulse modulation signal based on the voltage difference generated across the resistor Rs based on the error current IC.
- the low side gate driver 35 drives the NMOS transistor N1 based on the pulse modulation signal.
- One terminal of the primary side coil of the transformer 37 is connected to the drain of the NMOS transistor N1, and the other terminal of the primary side coil is connected to the DC power supply PWR1.
- One terminal of the secondary coil of the transformer 37 is connected to the ground terminal, and the other terminal of the secondary coil is connected to the anode of the diode D1.
- the cathode of the diode D1 is connected to one terminal of the inductor L3.
- the other terminal of the inductor L3 is connected to the terminal 5.
- the anode of the diode D2 is connected to the ground terminal, and the cathode is connected to a connection point between one terminal of the inductor L3 and the cathode of the diode D1.
- the DC power supply PWR1 outputs a DC voltage V1.
- the transformer 37 in the power amplifying unit of the switching regulator, the high-side gate driver 36 and the PMOS transistor P1 used in the current source 24 of the first embodiment are not necessary.
- the switching regulator in order to output a high voltage, a high voltage is applied from the DC power source to the PMOS transistor P1.
- the use of the transformer 37 as in the current source 24 of the second embodiment eliminates the need for a transistor to which a high voltage is applied, thereby suppressing the possibility of breakdown due to the high voltage operation of the transistor. Can do. That is, the current source 27 can ensure higher reliability than the current source 24 of the first embodiment.
- the power modulator 40a is used in place of the power modulator 40.
- the power supply modulator 40 a includes a current source 27 a that is used in place of the current source 27 of the power supply modulator 40.
- the current source 27 a has a pulse signal source 38 instead of the pulse modulator 34.
- the resistor Rs may be removed and short-circuited, or may be installed.
- the current IM and the amplitude modulation are adjusted by adjusting the output timing of the low frequency amplitude modulated signal VC_L, the high frequency amplitude modulated signal VC_H, and the pulse signal VG, as in the modified example of the first embodiment. It is possible to correct the error due to the delay with the signal VC and suppress the power consumption of the low frequency voltage source 21 and the high frequency voltage source 22.
- Embodiment 3 A power supply modulator 50 according to the third embodiment shown in FIG. 16 will be described.
- the power supply modulator 50 is used in place of the power supply modulator 20.
- the power supply modulator 50 includes a current source 28 instead of the current source 24 of the power supply modulator 20.
- the current source 28 is a switching regulator using a transformer like the current source 27 of the second embodiment, and its function corresponds to the current source 24.
- the current source 27 includes a resistor Rs, a pulse modulator 34, a low-side gate driver 35, an NMOS transistor N1, a transformer 37, diodes D1 and D2, an inductor L3, a first DC power supply PWR1, and a second DC power supply PWR2.
- the resistor Rs is used in common with the synthesis circuit 23 and detects the magnitude of the error current IC.
- the pulse modulator 34 generates a pulse modulation signal based on the voltage difference generated across the resistor Rs based on the error current IC.
- the low side gate driver 35 drives the NMOS transistor N1 based on the pulse modulation signal.
- One terminal of the primary side coil of the transformer 37 is connected to the drain of the NMOS transistor N1, and the other terminal of the primary side coil is connected to the first DC power supply PWR1.
- One terminal of the secondary side coil of the transformer 37 is connected to the second DC power supply PWR2, and the other terminal of the secondary side coil is connected to the anode of the diode D1.
- the cathode of the diode D1 is connected to one terminal of the inductor L3.
- the other terminal of the inductor L3 is connected to the terminal 5.
- the anode of the diode D2 is connected to the second DC power supply PWR2, and the cathode is connected to a connection point between one terminal of the inductor L3 and the cathode of the diode D1.
- the first DC power supply PWR1 outputs a DC voltage V1
- the second DC power supply PWR2 outputs a DC voltage V2.
- the diodes D1 and D2 add the DC voltage V2 output from the second DC power supply PWR2 to the signal S1 output from the secondary side coil of the transformer 37 and output it to the inductor L3. That is, the diodes D1 and D2 operate as a synthesis circuit that adds the DC voltage V2 output from the second DC power supply PWR2 to the signal S2 and outputs the result.
- the signal S2 input to the inductor L3 has a waveform shown in FIG.
- the inductor L3 smoothes the pulse signal given as the signal S2, removes spurious components, and supplies the current IM to the RF amplifier 30.
- the amplitude modulation signal VC is amplified with a gain proportional to the DC voltage V1 output from the first DC power supply PWR1, and further converted into an amplified signal.
- the modulation power supply signal VOUT is generated by adding the DC voltage V2 output from the second DC power supply PWR2.
- This modulated power supply signal VOUT is supplied to the power supply terminal 5 of the RF amplifier 30. Therefore, the output signal of the RF amplifier 30 is amplitude-modulated by the modulation power supply signal VOUT.
- the modulation power supply signal VOUT supplied as the power supply voltage to the RF amplifier 30 is a signal that is restricted so as not to be lower than the DC voltage V2 output from the second DC power supply PWR2, and therefore, the modulation power supply signal VOUT Distortion that occurs in the output signal of the RF amplifier 30 when the voltage drops is suppressed.
- the power loss of the power supply modulator 50 is mainly caused by the switching loss of the NMOS transistor N1 and the diodes D1 and D2.
- the switching loss LSW of the NMOS transistor N1 is expressed by equation (1).
- R is the impedance of the load of the RF amplifier 30
- fsw is the average switching frequency of the pulse modulation signal output from the pulse modulator 34
- ⁇ t is the total switching time at the on time and off time.
- the switching loss Ld1 of the diode D1 is expressed by the equation (2).
- the total power loss Ltotal of the power supply modulator 410 is expressed by the following equation (4).
- the electric power Pout output from the power supply modulator 410 is shown by Formula (5). Where d is the average duty of the pulse modulation signal.
- Pout / Ltotal is a function that increases monotonically in proportion to the value of r.
- the power efficiency ⁇ is a function that increases monotonically in proportion to the value of out / Ltotal. Therefore, the power efficiency ⁇ is a function that increases monotonically in proportion to the value of r.
- the power amplifier according to the third embodiment has a configuration in which the value of r is increased by supplying the DC voltage V2 from the second DC power supply PWR2 to the diodes D1 and D2. Therefore, in the power amplifier of the third embodiment, the power efficiency ⁇ can be improved.
- the power efficiency of the entire power amplifier according to the third embodiment mainly depends on the power efficiency of the power supply modulator 50 and the power efficiency of the RF amplifier 30, and (power efficiency of the power supply modulator 50) ⁇ (of the RF amplifier 30). Power efficiency).
- the power efficiency of the power supply modulator 50 is 50 to 70% when the output voltage V2 of the second DC power supply PWR2 is 0 V, and is improved to 85 to 95% when V2 is set to 5 to 10 V.
- the power efficiency of the RF amplifier 30 generally decreases as the value of the output voltage V2 of the second DC power supply PWR2 increases.
- the DC voltage V2 output from the second DC power supply PWR2 is increased so that the power efficiency improved by the power supply modulator 50 is larger than the power efficiency decreased by the RF amplifier 30. If the value is set, the power efficiency of the entire power amplifier can be improved.
- the power supply modulator 50 a is used in place of the power supply modulator 50.
- the power supply modulator 50 a includes a current source 28 a instead of the current source 28 of the power supply modulator 50.
- the current source 28 a includes a pulse signal source 38 instead of the pulse modulator 34.
- the resistor Rs may be removed and short-circuited, or may be installed.
- the current IM and the amplitude modulation are adjusted by adjusting the output timings of the low-frequency amplitude modulation signal VC_L, the high-frequency amplitude modulation signal VC_H, and the pulse signal VG as in the modification of the first embodiment. It is possible to correct the error due to the delay with the signal VC and suppress the power consumption of the low frequency voltage source 21 and the high frequency voltage source 22.
- the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the spirit of the present invention.
- the power efficiency can be improved by using a switching regulator as the current source of the power supply modulator.
- the voltage source low frequency voltage source 21 and high frequency The effect of improving the power efficiency of the voltage source 22 is not impaired.
- the present invention can be used for a transmission power amplifier used in a wireless communication device.
Abstract
Description
以下、図面を参照して本発明の実施の形態について説明する。図1に本実施の形態にかかる電力増幅器1のブロック図を示す。図1に示す電力増幅器は、ET(Envelope Tracking)方式により電力増幅を行う。図1に示すように、電力増幅器1は、ポーラ変調器10、電源変調器20、RF(Radio Frequency)アンプ30を有する。また、電力増幅器1は、入力端子2、出力端子6、端子3~5を有する。そして、電力増幅器1は、入力端子2により送信すべき変調信号(データ信号)を受信し、増幅後の変調信号を出力端子6から出力する。また、ポーラ変調器10と電源変調器20は端子3により接続され、ポーラ変調器10とRFアンプ30は端子4により接続され、電源変調器20とRFアンプ30は、端子5により接続される。
図13に示す実施の形態1の変形例にかかる電源変調器20bについて説明する。電源変調器20bは、電源変調器20に代えて用いられるものである。電源変調器20bは、電源変調器20の電流源24に代えて用いられる電流源24aを有する。電流源24aは、パルス変調器34に代えてパルス信号源38を有する。パルス変調器38は、電源変調器20のパルス変調器34が出力するパルス信号と同じパルス信号VGを事前に計算し出力する機能を有する。また、パルス信号源38は、低周波信号源31および高周波信号源32と同期を取り、低周波振幅変調信号VC_Lと高周波振幅変調信号VC_Hとパルス信号VGの出力タイミングを所望の値に設定できる機能を有する。電源変調器20bにおいて抵抗Rsは除去して短絡しても良く、もしくは設置しても良い。
図14に示す実施の形態2にかかる電源変調器40について説明する。電源変調器40は、電源変調器20に代えて用いられるものである。また、電源変調器40は、電源変調器20の電流源24に代えて電流源27を有する。電流源27は、トランスを用いたスイッチングレギュレータであり、その機能は電流源24に相当する。
図15に示す実施の形態2の変形例にかかる電源変調器40aについて説明する。電源変調器40aは、電源変調器40に代えて用いられるものである。電源変調器40aは、電源変調器40の電流源27に代えて用いられる電流源27aを有する。電流源27aはパルス変調器34に代えてパルス信号源38を有する。電源変調器40aにおいて抵抗Rsは除去して短絡しても良く、もしくは設置しても良い。
図16に示す実施の形態3にかかる電源変調器50について説明する。電源変調器50は、電源変調器20に代えて用いられるものである。また、電源変調器50は、電源変調器20の電流源24に代えて電流源28を有する。電流源28は、実施の形態2の電流源27と同様にトランスを用いたスイッチングレギュレータであり、その機能は電流源24に相当する。
図19に示す実施の形態3の変形例にかかる電源変調器50aについて説明する。電源変調器50aは、電源変調器50に代えて用いられるものである。電源変調器50aは、電源変調器50の電流源28に代えて電流源28aを有する。電流源28aは、パルス変調器34に代えてパルス信号源38を有する。電源変調器50aにおいて抵抗Rsは除去して短絡しても良く、もしくは設置しても良い。
2 入力端子
3-5 端子
6 出力端子
7 遅延回路
10、10a ポーラ変調器
20、20a、20b、40、40a、50、50a 電源変調器
21 低周波電圧源
22 高周波電圧源
23 合成回路
24、24a、27、27a、28、28a 電流源
25 低域通過フィルタ
26 高域通過フィルタ
30 RFアンプ
31 低周波信号源
32 高周波信号源
33 バッファ回路
34 パルス変調器
35 ローサイドゲートドライバ
36 ハイサイドゲートドライバ
37 トランス
38 パルス信号源
210 電圧源
311 信号源
312 バッファ回路
CH、CL コンデンサ
D1、D2 ダイオード
L1~L3 インダクタ
N1 NMOSトランジスタ
ND1 電圧合成ノード
ND2 電圧電流合成ノード
P1 PMOSトランジスタ
PWR1、PWR2 直流電源
Rs 抵抗
VDD 直流電源端子
V1、V2 直流電圧
IC 誤差電流
IC_H 高周波誤差電流
IC_L 低周波誤差電流
IM 電流
IRL 電流
VC 振幅変調信号
VC_H 高周波振幅変調信号
VC_L 低周波振幅変調信号
VOUT 変調電源信号
Claims (16)
- 振幅変調成分及び位相変調成分を含む変調信号を増幅する電力増幅器であって、
前記変調信号の振幅変調成分のうち低周波成分を増幅して第1の電圧を出力する第1の電圧源と、
前記変調信号の振幅変調成分のうち高周波成分を増幅して第2の電圧を出力する第2の電圧源と、
前記変調信号の振幅成分を増幅して電流を出力する電流源と、
前記第1の電圧、前記第2の電圧及び前記電流を合成して変調電源信号を生成する合成回路と、
前記変調信号を搬送波に重畳した信号を増幅すると共に、該増幅後の信号を前記変調電源により振幅変調して出力するRFアンプと、
を有する電力増幅器。 - 送信信号として振幅変調成分及び位相変調成分を含む変調信号を増幅する電力増幅器であって、
前記変調信号の振幅成分のうち低周波成分を増幅して第1の電圧を出力する第1の電圧源と、
前記変調信号の振幅成分のうち高周波成分を増幅して第2の電圧を出力する第2の電圧源と、
前記変調信号の振幅成分を増幅して電流を出力する電流源と、
前記第1の電圧、前記第2の電圧及び前記電流を合成して変調電源信号を生成する合成回路と、
前記位相変調成分を搬送波に重畳した信号を増幅すると共に、該増幅後の信号を前記変調電源信号により振幅変調して出力するRFアンプと、
を有する電力増幅器。 - 合成回路は、
前記第1の電圧源の出力端子に接続され、前記第1の電圧源の高周波ノイズを除去する低域通過フィルタと、
前記第2の電圧源の出力端子に接続され、前記第2の電圧源の低周波ノイズを除去する広域通過フィルタと、を有し、
前記低域通過フィルタのカットオフ周波数は、前記広域通過フィルタのカットオフ周波数よりも小さく設定される請求項1又は2に記載の電力増幅器。 - 前記第1の電圧源と前記第2の電圧源は、前記第1の電圧と前記第2の電圧との出力タイミングを同期させる請求項1乃至3のいずれか1項に記載の電力増幅器。
- 前記電流源は、帰還増幅器であり、前記電流源の出力と前記低域通過フィルタ及び前記広域通過フィルタとの間に備えた抵抗の電圧差を検知し、前記電圧差が小さくなるように前記電流を出力する請求項1乃至3のいずれか1項に記載の電力増幅器。
- 前記電流源は、
前記合成回路の出力電流の検出値をパルス変調信号に変換するパルス変調器と、
前記パルス変調信号を増幅するスイッチングアンプと、
前記スイッチングアンプの出力信号を平滑化して電流を出力する平滑フィルタと、
を有する請求項1乃至5のいずれか1項に記載の電力増幅器。 - 前記電流源は、
パルス変調信号を出力するパルス信号源と、
前記パルス変調信号を増幅するスイッチングアンプと、
前記スイッチングアンプの出力信号を平滑化して電流を出力する平滑フィルタと、
を有する請求項1乃至4のいずれか1項に記載の電力増幅器。 - 前記パルス信号源は、前記第1の電圧又は前記第2の電圧の少なくとも一方と同期した前記パルス信号を出力する請求項7に記載の電力増幅器。
- 前記スイッチングアンプは、
直流電源と接地電源との間に直列に接続される第1、第2のスイッチング素子と、
前記第1、第2のスイッチング素子の一端が互いに接続される接続点に設けられる出力端子と、を有し、
前記第1、第2のスイッチング素子により、前記直流電源から前記出力端子に出力される電流の制御及び前記出力端子から前記接地電源に引き込まれる電流の制御を行い、前記パルス変調信号を増幅する請求項6乃至8のいずれか1項に記載の電力増幅器。 - 前記スイッチングアンプは、
トランスと、
前記トランスの一次側コイルの一端に接続された直流電源端子と、
前記トランスの一次側コイルの他端に接続されたスイッチング素子と、
前記トランスの二次側コイルの一端に接続された接地電源端子と、
前記トランスの二次側コイルの他端に接続された第1の整流素子と、
前記第2の直流電源と前記第1の整流素子の出力側端子との間に接続された第2の整流素子と、を有し、
前記パルス変調信号により前記スイッチング素子を制御することで前記直流電源端子から前記トランスの一次側コイルに流れる電流を制御して前記パルス変調信号を増幅し、
前記トランスと前記第1、第2の整流素子を介して前記第2の整流素子の出力端子に増幅した前記パルス変調信号を出力する請求項6乃至8のいずれか1項に記載の電力増幅器。 - 前記スイッチングアンプは、
トランスと、
前記トランスの一次側コイルの一端に接続された第1の直流電源端子と、
前記トランスの一次側コイルの他端に接続されたスイッチング素子と、
前記トランスの二次側コイルの一端に接続された第2の電源端子と、
前記トランスの二次側コイルの他端に接続された第1の整流素子と、
前記第2の直流電源と前記第1の整流素子の出力側端子との間に接続された第2の整流素子と、を有し、
前記パルス変調信号により前記スイッチング素子を制御することで前記第2の直流電源端子から前記トランスの二次側コイルに流れる電流を制御して前記パルス変調信号を増幅し、
前記トランスと前記第1、第2の整流素子を介して前記第2の整流素子の出力端子に増幅した前記パルス変調信号を出力する請求項6乃至8のいずれか1項に記載の電力増幅器。 - 前記平滑フィルタは、インダクタ素子であって、低域通過フィルタとして機能する請求項6乃至11のいずれか1項に記載の電力増幅器。
- 前記変調信号の前記振幅変調成分は、ポーラ変調器が前記変調信号から抽出したものである請求項1乃至12のいずれか1項に記載の電力増幅器。
- 振幅変調成分及び位相変調成分を含む変調信号を増幅する電力増幅方法であって、
前記変調信号の振幅成分のうち低周波成分を増幅して第1の電圧を出力し、
前記変調信号の振幅成分のうち高周波成分を増幅して第2の電圧を出力し、
前記変調信号の振幅成分を増幅して電流を出力し、
前記第1の電圧、前記第2の電圧及び前記電流を合成して変調電源信号を生成し、
前記変調信号を搬送波に重畳した信号を増幅すると共に、該増幅後の信号を前記変調電源により振幅変調して出力する電力増幅方法。 - 振幅変調成分及び位相変調成分を含む変調信号を増幅する電力増幅方法であって、
前記変調信号の振幅成分のうち低周波成分を増幅して第1の電圧を出力し、
前記変調信号の振幅成分のうち高周波成分を増幅して第2の電圧を出力し、
前記変調信号の振幅成分を増幅して電流を出力し、
前記第1の電圧、前記第2の電圧及び前記電流を合成して変調電源信号を生成し、
前記位相変調信号を搬送波に重畳した信号を増幅すると共に、該増幅後の信号を前記変調電源により振幅変調して出力する電力増幅方法。 - 前記変調信号の前記振幅変調成分は、ポーラ変調器が前記変調信号から抽出したものである請求項14又は15に記載の電力増幅方法。
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EP2395655A1 (en) | 2011-12-14 |
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US8620240B2 (en) | 2013-12-31 |
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