WO2015114702A1 - Dispositif d'émission et procédé de commande de celui-ci - Google Patents

Dispositif d'émission et procédé de commande de celui-ci Download PDF

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Publication number
WO2015114702A1
WO2015114702A1 PCT/JP2014/005478 JP2014005478W WO2015114702A1 WO 2015114702 A1 WO2015114702 A1 WO 2015114702A1 JP 2014005478 W JP2014005478 W JP 2014005478W WO 2015114702 A1 WO2015114702 A1 WO 2015114702A1
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signal
pulse
modulation
intermediate frequency
signals
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PCT/JP2014/005478
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English (en)
Japanese (ja)
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憲明 田和
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日本電気株式会社
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Priority to JP2015559624A priority Critical patent/JP6229738B2/ja
Publication of WO2015114702A1 publication Critical patent/WO2015114702A1/fr

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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
    • H03F3/217—Class D power amplifiers; Switching amplifiers
    • 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
    • H03F1/0294—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers using vector summing of two or more constant amplitude phase-modulated signals
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/36—Modulator circuits; Transmitter circuits
    • H04L27/362—Modulation using more than one carrier, e.g. with quadrature carriers, separately amplitude modulated
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/331—Sigma delta modulation being used in an amplifying circuit

Definitions

  • the present invention relates to a transmission device and a control method thereof.
  • OFDM Orthogonal Frequency
  • PAPR peak power-to-average power ratio
  • class AB amplifiers are generally used as signal amplifiers.
  • a sufficient back-off is required to maintain the linearity of the output signal.
  • the power efficiency of the class AB amplifier is highest when the output is saturated, and decreases as the back-off increases. Therefore, there is a problem that it is difficult to amplify a modulation signal having a large PAPR with high power efficiency.
  • the transmission device converts a multi-bit baseband signal into a 1-bit pulse waveform ⁇ modulation signal using a ⁇ modulator. Then, by multiplying the ⁇ modulation signal and the carrier wave by a multiplier, an RF pulse modulation signal up-converted to the RF band is generated.
  • the switching amplifier can amplify the RF pulse modulation signal without generating distortion due to nonlinear characteristics. Furthermore, since the amplitude of the RF pulse modulation signal does not change even if the PAPR is large and is represented by only a binary value, the switching amplifier can amplify the RF pulse modulation signal with high power efficiency.
  • Non-Patent Document 1 in order to obtain a necessary signal-to-noise ratio in the OFDM modulation scheme of IEEE 802.11a standard, a ⁇ modulator is used at a clock frequency 32 times or 64 times the sampling frequency of the baseband signal. Need to work. Specifically, when the sampling frequency is 20 MHz, the ⁇ modulator needs to be operated at a clock frequency of 640 MHz or 1.28 GHz. Since such a ⁇ modulator that operates at a high-speed clock frequency in the order of GHz is difficult to realize with an FPGA, it is constructed by a digital RF circuit.
  • Patent Documents 1 to 4 disclose a transmission apparatus having a configuration in which a ⁇ modulator and a switching amplifier are combined.
  • the clock signal supplied to the ⁇ modulator and the carrier wave are asynchronous.
  • the reference signal source for the clock signal and the carrier wave is common, the clock signal and the carrier wave become asynchronous due to the difference in transmission path and the difference in duty ratio due to sine wave or rectangular wave.
  • the signal transition refers to a transition of the amplitude from “H” to “L” or from “L” to “H”.
  • the carrier frequency is sufficiently larger than the clock frequency, the signal transition frequency of the carrier is sufficiently higher than that of the ⁇ modulation signal, and the shift of the signal transition timing can be ignored.
  • the carrier frequency and the clock frequency are approximately the same, this influence cannot be ignored, resulting in a decrease in modulation accuracy and a decrease in power efficiency of the switching amplifier.
  • the radio frequency in UTRA Universal Terrestrial Radio Access
  • E-UTRA Evolved Universal Terrestrial Radio Access
  • the radio frequency in UTRA (Universal Terrestrial Radio Access) and E-UTRA is 700 MHz to 3.5 GHz, which is similar to the clock frequency of the ⁇ modulator. Therefore, it is necessary to prevent the above problem by synchronizing the carrier wave and the clock signal.
  • Patent Document 5 A solution to such a problem is disclosed in Patent Document 5.
  • This transmission apparatus first converts a baseband signal represented by an in-phase component and a quadrature phase component into an amplitude signal and a phase signal having a constant amplitude.
  • the amplitude signal is converted into a ⁇ modulation signal using a ⁇ modulator
  • the phase signal is converted into an RF signal using a conventional analog quadrature modulator or the like.
  • the RF signal is converted into a pulse signal using a pulse phase signal generator, and an RF pulse modulation signal is generated by multiplying the pulse signal and the ⁇ modulation signal.
  • the pulse signal generated by the pulse phase signal generator is supplied to the ⁇ modulator and used as a clock signal.
  • an analog quadrature modulator or the like is required to convert the phase signal into an RF signal in addition to the ⁇ modulator.
  • the analog quadrature modulator is a modulator that is generally used in a transmission apparatus including a conventional class AB amplifier. That is, in order to create such a transmission device, in addition to the components necessary for the conventional transmission device, components related to ⁇ modulation are required, which complicates the device (in other words, the circuit scale). Increased).
  • the analog quadrature modulator is required to have a performance with a wider signal generation bandwidth than that for generating a normal phase amplitude modulated transmission signal. This, combined with the complexity of the device described above, increases the overall power consumption of the device.
  • the amplitude signal of the baseband signal input to the ⁇ modulator and the pulse signal cannot be synchronized. Therefore, there is a problem that invalid data during the transition time of the amplitude signal is sampled and transmission signal distortion increases.
  • the present invention has been made to solve such a problem, and an object of the present invention is to provide a transmission apparatus and a control method thereof that can suppress an increase in circuit scale.
  • a transmitting apparatus includes a baseband signal generation unit that generates an in-phase component signal and a quadrature phase component signal of a baseband signal, a second carrier and a second carrier that is 90 degrees out of phase with the first carrier.
  • First and second pulse signal generators for converting a carrier wave into first and second pulse signals having pulse waveforms, respectively, and outputting the in-phase component signal and the quadrature-phase component signal to the first and second pulses, respectively.
  • a first and second ⁇ modulators that perform ⁇ modulation in synchronization with the signal and output as first and second ⁇ modulation signals, and multiply the first ⁇ modulation signal and the first pulse signal to obtain a first RF pulse modulation signal.
  • a switching amplifier for amplifying is input to the switching amplifying unit, or the output from the switching amplifier section, and a combiner for combining said first and said second 2RF pulse modulated signal.
  • the transmitting apparatus includes a baseband signal generation unit that generates an in-phase component signal and a quadrature phase component signal of a baseband signal, and a first based on the in-phase component signal and the quadrature phase component signal.
  • An IF signal generation unit that generates an intermediate frequency signal
  • a first pulse signal generation unit that converts the first carrier wave into a first pulse signal having a pulse waveform, and outputs the first carrier signal, and the first intermediate frequency signal is converted into the first pulse signal.
  • a first ⁇ modulator that performs ⁇ modulation in synchronization and outputs a first ⁇ modulation signal; a first multiplier that multiplies the first ⁇ modulation signal and the first pulse signal to generate a first RF pulse modulation signal; A first switching amplifier for amplifying the first RF pulse modulation signal.
  • a control method of a transmission apparatus generates an in-phase component signal and a quadrature phase component signal of a baseband signal, and each of a first carrier and a second carrier that is 90 degrees out of phase with the first carrier.
  • the first and second pulse signals having a pulse waveform are converted and output, and the in-phase component signal and the quadrature component signal are ⁇ -modulated in synchronization with the first and second pulse signals, respectively.
  • Output as a 2 ⁇ modulation signal multiply the first ⁇ modulation signal and the first pulse signal to generate a first RF pulse modulation signal, and multiply the second ⁇ modulation signal and the second pulse signal to generate a second RF signal.
  • Generate a pulse modulation signal amplify the first and second RF pulse modulation signals using a switching amplifier, and input to the switching amplifier, or the switching amplifier
  • the first and the second RF pulse modulation signals output from are synthesized.
  • a control method of a transmission device generates an in-phase component signal and a quadrature component signal of a baseband signal, and a first intermediate frequency signal based on the in-phase component signal and the quadrature component signal
  • the first carrier wave is converted into a first pulse signal having a pulse waveform and output, and the first intermediate frequency signal is ⁇ -modulated in synchronization with the first pulse signal and output as a first ⁇ -modulated signal
  • a first RF pulse modulation signal is generated by multiplying the first ⁇ modulation signal and the first pulse signal, and the first RF pulse modulation signal is amplified using a first switching amplifier.
  • FIG. 3 is a block diagram illustrating a configuration example of a transmission apparatus according to Embodiment 1.
  • FIG. 3 is a block diagram illustrating a specific configuration example of a transmission apparatus according to Embodiment 1.
  • FIG. 6 is a timing chart illustrating a part of the operation of the transmission apparatus according to the first embodiment.
  • 6 is a block diagram illustrating a first modification of the transmission apparatus according to Embodiment 1.
  • FIG. 6 is a block diagram illustrating a second modification of the transmission apparatus according to Embodiment 1.
  • FIG. 6 is a block diagram illustrating a configuration example of a transmission apparatus according to Embodiment 2.
  • FIG. 10 is a block diagram showing a modification of the transmission apparatus according to Embodiment 2.
  • the constituent elements are not necessarily essential unless otherwise specified or apparently essential in principle.
  • the shapes when referring to the shapes, positional relationships, etc. of the components, etc., the shapes are substantially the same unless otherwise specified, or otherwise apparent in principle. And the like are included. The same applies to the above numbers and the like (including the number, numerical value, quantity, range, etc.).
  • FIG. 1 is a block diagram illustrating a configuration example of a transmission apparatus according to Embodiment 1.
  • FIG. 2 is a block diagram illustrating a more specific configuration example of the transmission apparatus illustrated in FIG.
  • FIG. 3 is a timing chart showing the operation of a part of the transmission apparatus shown in FIG.
  • the transmission apparatus according to the present embodiment performs ⁇ modulation on the in-phase component signal I and the quadrature component signal Q of the baseband signal in synchronization with the pulse signals P1 and P2 that are different in phase by 90 degrees, respectively, Multiplying by P2, RF pulse modulation signals R1 and R2 are generated.
  • the RF pulse modulation signals R1 and R2 are amplified by the switching amplifier and synthesized by the synthesizer to obtain a transmission signal.
  • the transmission apparatus uses the in-phase component signal I and the quadrature component signal Q of the baseband signal as the RF signal in order to obtain the pulse signals P1 and P2 input to the ⁇ modulator and the multiplier. Therefore, it is not necessary to provide a modulator (IQ modulator) that modulates the signal to the circuit, so that an increase in circuit scale can be suppressed and power consumption can be reduced.
  • IQ modulator IQ modulator
  • a transmission device 1 shown in FIG. 2 is a transmission device in a communication device such as a mobile phone or a wireless LAN, for example, and includes an RF pulse modulation signal generation unit 10, a switching amplification unit 20, bandpass filters 13 and 14, And a synthesizer 15.
  • the RF pulse modulation signal generation unit 10 includes a digital baseband signal generation unit (baseband signal generation unit) 101, a pulse signal generator (first pulse signal generation unit) 102, and a pulse signal generator (second pulse).
  • an oscillator 108 and a phase shifter 109 is a digital baseband signal generation unit (baseband signal generation unit) 101, a pulse signal generator (first pulse signal generation unit) 102, and a pulse signal generator (second pulse).
  • Digital baseband signal generator 101 generates an in-phase component signal I and the quadrature component signal Q of the baseband signal S BB. Note that the in-phase component signal I and the quadrature component signal Q of the baseband signal are digital signals that take a multilevel state.
  • the oscillator 108 generates an oscillation signal having a frequency fc.
  • the phase shifter 109 outputs a carrier wave CW1 that is in phase with the oscillation signal of the oscillator 108, and outputs a carrier wave CW2 that is 90 degrees out of phase with the carrier wave CW1.
  • the pulse signal generator 102 converts the carrier wave (first carrier wave) CW1 having the frequency fc into a pulse signal (first pulse signal) P1 having a pulse waveform and outputs the pulse signal.
  • the pulse signal generator 103 converts a carrier wave (second carrier wave) CW2 having a phase difference of 90 degrees from the carrier wave CW1 into a pulse signal (second pulse signal) P2 having a pulse waveform and outputs the pulse signal.
  • the pulse signal generator 102 includes, for example, a comparator that indicates an H level (value “1”) when the carrier wave CW1 is greater than 0 and an L level (value “ ⁇ 1”) when the carrier wave CW1 is less than 0. Prepare. Similarly, the pulse signal generator 103 indicates, for example, an H level (value “1”) when the carrier wave CW2 is greater than 0, and an L level (value “ ⁇ 1”) when the carrier wave CW2 is less than 0. A comparator is provided.
  • the ⁇ modulator 104 ⁇ modulates the in-phase component signal I of the baseband signal in synchronization with the pulse signal P1, and outputs it as a ⁇ modulation signal (first ⁇ modulation signal) M1.
  • the ⁇ modulator 105 performs ⁇ modulation on the quadrature component signal Q of the baseband signal in synchronization with the pulse signal P2, and outputs it as a ⁇ modulation signal (second ⁇ modulation signal) M2.
  • the ⁇ modulator 104 samples the multi-level in-phase component signal I in synchronization with the rising edge of the pulse signal P1, and generates a binary ⁇ modulation signal M1 of 1 and ⁇ 1. Convert and output.
  • the ⁇ modulator 105 samples the multi-level quadrature phase component signal Q in synchronization with the rising edge of the pulse signal P2, converts it into a binary ⁇ modulation signal M2 of 1, -1, and outputs it.
  • Multiplier 106 multiplies ⁇ modulation signal M1 output from ⁇ modulator 104 and pulse signal P1, and outputs an RF pulse modulation signal (first RF pulse modulation signal) R1 upconverted to the RF band.
  • Multiplier 107 multiplies ⁇ modulation signal M2 output from ⁇ modulator 105 and pulse signal P2, and outputs an RF pulse modulation signal (second RF pulse modulation signal) R2 upconverted to the RF band.
  • the multiplier 106 sets “1” when the value of the pulse signal P1 is “1” and the pulse signal P1.
  • “ ⁇ 1” is output.
  • the multiplier 106 sets “ ⁇ 1” when the value of the pulse signal P1 is “1”, and sets the value of the pulse signal P1 to “ ⁇ 1”. In this case, “1” is output.
  • the relationship between the ⁇ modulation signal M2 and the pulse signal P2 and the RF pulse modulation signal R2 in the multiplier 107 is the same as the relationship between the ⁇ modulation signal M1 and the pulse signal P1 and the RF pulse modulation signal R1 in the multiplier 106.
  • the pulse signals P1 and P2 are used as carrier signals for the multipliers 106 and 107 and also as clock signals for the ⁇ modulators 104 and 105. As described above, by using the carrier signal and the clock signal in common, it is possible to prevent the synchronization deviation between the ⁇ modulation signals M1 and M2 and the carrier signal.
  • the switching amplifier 20 includes a switching amplifier (first switching amplifier) 11 and a switching amplifier (second switching amplifier) 12.
  • the switching amplifiers 11 and 12 are, for example, class D amplifiers or class E amplifiers, and are power amplifiers having high power efficiency.
  • the switching amplifiers 11 and 12 amplify the power of the RF pulse modulation signals R1 and R2, respectively, while maintaining their pulse waveforms.
  • the band pass filter 13 passes a desired frequency band in the output of the switching amplifier 11.
  • the band pass filter 14 passes a desired frequency band in the output of the switching amplifier 12.
  • the main purpose of the bandpass filters 13 and 14 is to reflect the quantization noise noise-shaved by the ⁇ modulators 104 and 105 included in the RF pulse modulation signals R1 and R2 amplified by the switching amplifiers 11 and 12. It is to improve the power efficiency of signal amplification. Since noise-shaped quantization noise is small in the vicinity of the signal, it is not necessary to remove the quantization noise to the vicinity of the signal band using the bandpass filters 13 and 14. When it is necessary to remove a noise component in the vicinity of the transmission signal due to a wireless communication standard or the like, it can be removed by a duplexer (not shown) provided at the subsequent stage of the synthesizer 15.
  • the synthesizer 15 synthesizes the outputs of the switching amplifiers 11 and 12 that have passed through the bandpass filters 13 and 14 and outputs the synthesized signal as a transmission signal Dout.
  • the transmission apparatus 1 amplifies and synthesizes the transmission signals (RF pulse modulation signals R1, R2) of the RF pulse modulation signal generation unit 10, and then outputs them as a transmission signal Dout.
  • This transmission signal Dout is wirelessly transmitted to the outside via an antenna (not shown).
  • the baseband signal SBB is expressed as the following equation (1), where x is an in-phase component signal I, y is a quadrature component signal Q, and i is an imaginary unit.
  • the carrier waves CW1 and CW2 are expressed by the following equations (2) and (3).
  • ⁇ represents angular velocity
  • t represents time
  • the amplitude is 1.
  • the RF pulse modulation signal R1 is expressed as the following Equation (4), omitting binarization by ⁇ modulation.
  • the RF pulse modulation signal R2 is expressed as the following equation (5), omitting binarization by ⁇ modulation.
  • the transmission signal Dout is expressed as the following equation (6).
  • the transmission apparatus 1 generates a desired transmission signal.
  • the transmitting apparatus performs ⁇ modulation on the in-phase component signal I and the quadrature component signal Q of the baseband signal in synchronization with the pulse signals P1 and P2 that are different in phase by 90 degrees, respectively.
  • RF pulse modulation signals R1 and R2 are generated by multiplying the pulse signals P1 and P2.
  • the RF pulse modulation signals R1 and R2 are amplified by the switching amplifier and synthesized by the synthesizer to obtain a transmission signal.
  • the transmission apparatus modulates the in-phase component signal I and the quadrature component signal Q of the baseband signal into an RF signal in order to obtain a pulse phase signal input to the ⁇ modulator and the mixer. Since there is no need to provide a modulator (IQ modulator) to increase, an increase in circuit scale can be suppressed. In addition, power consumption can be reduced.
  • IQ modulator IQ modulator
  • the transmission apparatus may input pulse signals (P1, P2) having the same frequency as the carrier wave to the ⁇ modulator and multiplier as the sampling clock and the carrier pulse signal, respectively. Even when the frequency is relatively high, it can operate normally with the sampling rate kept low. Since the sampling rate can be kept low, the power efficiency of the switching amplifier can be improved. In addition, since the common pulse signals (P1, P2) are input to the ⁇ modulator and the multiplier, synchronization can be established between the ⁇ modulator and the multiplier.
  • the quality of the transmission signal may be deteriorated due to the synchronization shift between the amplitude signal and the phase signal. On the other hand, such a problem does not occur in principle in the transmission apparatus according to the present embodiment.
  • FIG. 4 is a block diagram illustrating a first modification of the transmission device 1 illustrated in FIG. 2 as a transmission device 1a.
  • the transmitting apparatus 1a illustrated in FIG. 4 includes a bandpass filter 16 at the subsequent stage of the combiner 15 instead of including the bandpass filters 13 and 14 at the previous stage of the combiner 15.
  • the other configuration of the transmission device 1a shown in FIG. 4 is the same as that of the transmission device 1 shown in FIG.
  • FIG. 5 is a block diagram showing a second modification of the transmission apparatus 1 shown in FIG. 2 as a transmission apparatus 1b.
  • the transmission apparatus 1b illustrated in FIG. 5 includes a switching amplification unit 20 at the subsequent stage of the combiner 15 instead of including the switching amplification unit 20 at the previous stage of the combiner 15.
  • 5 includes a bandpass filter 16 at the subsequent stage of the switching amplifier 20, instead of including the bandpass filters 13 and 14 at the previous stage of the synthesizer 15.
  • the switching amplifier 20 includes a switching amplifier 17 that amplifies the RF pulse modulation signals R1 and R2 synthesized by the synthesizer 15.
  • the other configuration of the transmission device 1b shown in FIG. 5 is the same as that of the transmission device 1 shown in FIG.
  • FIG. 6 is a block diagram illustrating a configuration example of a transmission apparatus according to Embodiment 2.
  • a transmission device 1c illustrated in FIG. 6 includes an RF pulse modulation signal generation unit 10c, a switching amplifier (first switching amplifier) 11, and a bandpass filter 13.
  • the RF pulse modulation signal generation unit 10c includes a digital baseband signal generation unit (baseband signal generation unit) 101, an IF signal generation unit 110, a pulse signal generator (first pulse signal generation unit) 102, and a ⁇ modulator. 104, a multiplier (first multiplier) 106, and an oscillator 108.
  • the IF signal generation unit 110 generates the intermediate frequency signal IF1 based on the in-phase component signal I and the quadrature component signal Q of the baseband signal generated by the digital baseband signal generation unit 101.
  • the intermediate frequency signal IF1 one of the in-phase component and the quadrature component of the intermediate frequency signal obtained from the baseband signal is used.
  • the in-phase component is used as the intermediate frequency signal IF1.
  • the intermediate frequency signal IF1 can be expressed as the following Expression (7).
  • ⁇ IF is an angular velocity corresponding to the center frequency of the intermediate frequency signal IF1
  • t is time
  • x is an in-phase component signal I
  • y is a quadrature component signal Q.
  • the pulse signal generator 102 converts the carrier wave CW1 generated by the oscillator 108 into a pulse signal (first pulse signal) P1 having a pulse waveform and outputs the pulse signal.
  • the ⁇ modulator 104 ⁇ modulates the intermediate frequency signal IF1 in synchronization with the pulse signal P1, and outputs it as a ⁇ modulation signal (first ⁇ modulation signal) M3.
  • Multiplier 106 multiplies ⁇ modulation signal M3 output from ⁇ modulator 104 and pulse signal P1, and outputs an RF pulse modulation signal (first RF pulse modulation signal) R3 upconverted to the RF band.
  • the switching amplifier 11 amplifies the power of the RF pulse modulation signal R3 while maintaining the pulse waveform.
  • the band-pass filter 13 passes a desired frequency band in the output of the switching amplifier 11 and outputs it as a transmission signal Dout.
  • the output of the switching amplifier 11 includes an image signal having the same level of power at a frequency opposite to that of the target signal and the carrier frequency. Therefore, the band pass filter 13 needs to remove the frequency band of the image signal.
  • the transmission device 1c amplifies the transmission signal (RF pulse modulation signal R3) of the RF pulse modulation signal generation unit 10c, and then outputs it as the transmission signal Dout through the narrow band pass filter 13.
  • This transmission signal Dout is wirelessly transmitted to the outside via an antenna (not shown).
  • the transmission apparatus uses the baseband signal of the baseband signal to obtain the pulse phase signal input to the ⁇ modulator and the mixer. Since it is not necessary to provide a modulator (IQ modulator) that modulates the in-phase component signal I and the quadrature component signal Q into an RF signal, an increase in circuit scale can be suppressed. In addition, power consumption can be reduced. That is, the transmitting apparatus according to the present embodiment can achieve the same effect as that of the first embodiment.
  • IQ modulator IQ modulator
  • FIG. 7 is a block diagram illustrating a modified example of the transmission device 1c illustrated in FIG. 6 as a transmission device 1d.
  • 7 includes an RF pulse modulation signal generation unit 10d, a switching amplifier 11, a switching amplifier (second switching amplifier) 12, bandpass filters 13 and 14, and a combiner 15.
  • the RF pulse modulation signal generation unit 10d includes a digital baseband signal generation unit (baseband signal generation unit) 101, an IF signal generation unit 111, a pulse signal generator 102, and a pulse signal generator (second pulse signal generation unit). ) 103, ⁇ modulator 104, ⁇ modulator 105, multiplier 106, multiplier (second multiplier) 107, oscillator 108, and phase shifter 109.
  • the IF signal generation unit 111 generates the intermediate frequency signal IF1 and the intermediate frequency signal IF2 based on the in-phase component signal I and the quadrature component signal Q of the baseband signal generated by the digital baseband signal generation unit 101.
  • the in-phase component is used as the intermediate frequency signal IF1
  • the quadrature component is used as the intermediate frequency signal IF2.
  • the intermediate frequency signal IF2 can be expressed as the following Expression (8).
  • the quadrature component is used as the intermediate frequency signal IF1
  • the in-phase component is used as the intermediate frequency signal IF2.
  • the pulse signal generator 103 converts the carrier wave CW2 having a phase difference of 90 degrees from the carrier wave CW1 into a pulse signal (second pulse signal) P2 having a pulse waveform and outputs the pulse signal.
  • the ⁇ modulator 105 ⁇ modulates the intermediate frequency signal IF2 in synchronization with the pulse signal P2, and outputs it as a ⁇ modulation signal (second ⁇ modulation signal) M4.
  • Multiplier 107 multiplies ⁇ modulation signal M4 output from ⁇ modulator 105 and pulse signal P2, and outputs an RF pulse modulation signal (second RF pulse modulation signal) R4 upconverted to the RF band.
  • the switching amplifier 12 amplifies the power of the RF pulse modulation signal R4 while maintaining the pulse waveform.
  • the band pass filter 14 passes a desired frequency band in the output of the switching amplifier 12.
  • the synthesizer 15 synthesizes the outputs of the switching amplifiers 11 and 12 that have passed through the band-pass filters 13 and 14 and outputs the result as a transmission signal Dout. At this time, the above-described image signal is canceled. Therefore, it is not necessary to narrow the bandpass filters 13 and 14 for image signal removal.
  • the transmission apparatus includes the in-phase component signal I and the quadrature component signal Q of the baseband signal. Since it is not necessary to provide a modulator (IQ modulator) that modulates the signal to an RF signal, an increase in circuit scale can be suppressed. In addition, power consumption can be reduced.
  • IQ modulator IQ modulator
  • the transmitting apparatuses according to the first and second embodiments may input pulse signals (P1, P2) having the same frequency as the carrier wave to the ⁇ modulator and multiplier as the sampling clock and the carrier pulse signal, respectively. Even when the frequency of the carrier wave is relatively high, it can operate normally with the sampling rate kept low. Moreover, since the sampling rate can be kept low, the power efficiency of the switching amplifier can be improved. In addition, since the common pulse signals (P1, P2) are input to the ⁇ modulator and the multiplier, synchronization can be established between the ⁇ modulator and the multiplier.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)
  • Transmitters (AREA)

Abstract

Un mode de réalisation de l'invention concerne un dispositif d'émission (1) comprenant : des générateurs de signal impulsionnel (102, 103) qui convertissent une onde porteuse (CW1) et une autre onde porteuse (CW2) déphasée de 90° par rapport à ladite onde porteuse (CW1) respectivement en signaux impulsionnels (P1, P2) et délivrent lesdits signaux impulsionnels; des modulateurs delta-sigma (104, 105) qui délivrent des signaux modulés delta-sigma (M1, M2) obtenus en soumettant un signal à composante en phase (I) et un signal à composante de quadrature (Q) d'un signal en bande de base à une modulation delta-sigma synchronisée sur les signaux impulsionnels (P1, P2) respectifs; un multiplicateur (106) qui génère un signal modulé par impulsions RF (R1) en multipliant un signal modulé delta-sigma (M1) par le premier signal impulsionnel (P1); un multiplicateur (107) qui génère un autre signal modulé par impulsions RF (R2) en multipliant l'autre signal modulé delta-sigma (M2) par l'autre signal impulsionnel (P2); une unité d'amplification à commutation (20) qui amplifie les signaux modulés par impulsions RF (R1, R2); et un combineur (15) qui combine les signaux modulés par impulsions RF (R1, R2) amplifiés par ladite unité d'amplification à commutation (20).
PCT/JP2014/005478 2014-01-30 2014-10-29 Dispositif d'émission et procédé de commande de celui-ci WO2015114702A1 (fr)

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WO2017057164A1 (fr) * 2015-10-01 2017-04-06 日本電気株式会社 Émetteur numérique
JPWO2017057164A1 (ja) * 2015-10-01 2018-05-17 日本電気株式会社 デジタル送信機
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JPWO2017082243A1 (ja) * 2015-11-11 2018-09-27 日本電気株式会社 増幅器と送信機と増幅方法および複数アンテナ装置
US10574199B2 (en) 2015-11-11 2020-02-25 Nec Corporation Amplifier and transmitter, and transmission method

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