Abstract: A second-order ?? modulator includes a plurality of integrators and a parallel higher-bit processing part, and the parallel higher-bit processing part includes a plurality of addition and determination processing sections. The addition and determination processing section receives first and second carry inputs and first and second state inputs, and outputs a quantized output and first and second state outputs. A first selector selects one set from sets of the first and the second state outputs from the plurality of addition and determination processing sections and outputs the selected set, and a second selector selects one quantized output from the quantized outputs from the plurality of addition and determination processing sections. An output of the first selector is used as a selection control signal for the first and the second selectors.

Abstract: This ?? modulator is a ?? modulator using multiple integrators. The integrator: includes a plurality of stages of adder sequences, each of the adder sequences including a plurality of adders connected in series; performs feedback of a result of a second adder sequence as an input to a first adder sequence, the first adder sequence being a first stage of the plurality of stages, and the second adder sequence being a last stage of the plurality of stages; and processes inputs supplied to the plurality of adders of the first adder sequence and supplies it to the second adder sequence.

Abstract: In a digital transmitter, a digital RF signal generation unit executes digital modulation on I and Q signals to convert the I and Q signal into first and second digital RF signals, respectively, with a bit rate which is twice a carrier frequency. A retiming unit delays the first digital RF signal according to a clock signal with a frequency which is 4n times (n is an integer) the carrier frequency to output the delayed first digital RF signal and delays the phase of the second digital RF signal by 90 degrees with respect to an output of the first digital RF signal to output the delayed second digital RF signal. First and second amplifiers amplify the first and second digital RF signals output by the retiming unit, respectively. A combiner combines the amplified first and second digital RF signals to generate one signal sequence.

Abstract: The purpose of the present invention is to provide an amplifier having high signal-to-noise ratio of a transmitted signal and high electrical efficiency. Another purpose is to suppress complexity of amplifier's wiring connecting a signal generator that generates a binary digital signal and an amplification unit that amplifies the same. This amplifier generates a binary digital signal. The amplifier further generates a K-value digital signal (K is an integer greater than or equal to 3) from the binary digital signal and generating a plurality of binary digital signals from the K-value digital signal. The amplifier amplifies each of the plurality of binary digital signals, and combines the plurality of amplified binary digital signals and generating a combined signal having a substantially proportional relationship with the K-value digital signal.

Abstract: In a digital transmitter, a digital RF signal generation unit executes digital modulation on I and Q signals to convert the I and Q signal into first and second digital RF signals , respectively, with a bit rate which is twice a carrier frequency. A retiming unit delays the first digital RF signal according to a clock signal with a frequency which is 4n times (n is an integer) the carrier frequency to output the delayed first digital RF signal and delays the phase of the second digital RF signal by 90 degrees with respect to an output of the first digital RF signal to output the delayed second digital RF signal. First and second amplifiers amplify the first and second digital RF signals output by the retiming unit, respectively. A combiner combines the amplified first and second digital RF signals to generate one signal sequence.

Abstract: This ?? modulator is a ?? modulator using multiple integrators. The integrator: includes a plurality of stages of adder sequences, each of the adder sequences including a plurality of adders connected in series; performs feedback of a result of a second adder sequence as an input to a first adder sequence, the first adder sequence being a first stage of the plurality of stages, and the second adder sequence being a last stage of the plurality of stages; and processes inputs supplied to the plurality of adders of the first adder sequence and supplies it to the second adder sequence.

Abstract: A transmitter, a transmission system and a transmission method whereby AM-PM distortions can be compensated with high accuracy without affecting the functions of a predistortor, a ?? modulator and so on. The transmitter includes: a baseband signal generation circuit that outputs the amplitude value and phase value of a baseband signal; a ?? modulation circuit that performs a ?? modulation of the outputted amplitude and phase values to output a pulse signal train; a power supply modulation circuit that supplies, to a pre-stage amplifier, a voltage determined in accordance with the outputted amplitude value; the pre-stage amplifier and a post-stage amplifier that amplify the outputted pulse signal train; and a filter circuit that generates an output signal from the pulse signal train as amplified and outputs the output signal. The power supply modulation circuit determines the voltage for canceling a phase error occurring in the post-stage amplifier.

Abstract: The purpose of the present invention is to provide a high-power-efficiency and low-design-cost transmission device by implementing, with a constant clock, delta-sigma modulation maintaining a zero current switching property in an amplifier. This delta-sigma modulator comprises: a pulse phase signal generation unit for generating a pulse phase signal from a phase signal; a delta-sigma modulation unit for generating a pulse amplitude signal obtained by delta-sigma modulating an amplitude signal with a constant clock; a phase sorting unit for outputting a control signal on the basis of the phase signal; a delay switching unit for delaying the pulse amplitude signal on the basis of the control signal; and a mixing unit for outputting a pulse string obtained by multiplying together the delayed pulse amplitude signal and the pulse phase signal.

Abstract: The purpose of the present invention is to provide a high-power-efficiency and low-design-cost transmission device by implementing, with a constant clock, delta-sigma modulation maintaining a zero current switching property in an amplifier. This delta-sigma modulator comprises: a pulse phase signal generation unit for generating a pulse phase signal from a phase signal; a delta-sigma modulation unit for generating a pulse amplitude signal obtained by delta-sigma modulating an amplitude signal with a constant clock; a phase sorting unit for outputting a control signal on the basis of the phase signal; a delay switching unit for delaying the pulse amplitude signal on the basis of the control signal; and a mixing unit for outputting a pulse string obtained by multiplying together the delayed pulse amplitude signal and the pulse phase signal.

Abstract: A transmitter according to the present invention includes: a baseband amplitude value distribution processor (90) for changing a distribution of an amplitude value of a baseband signal based on a control signal that has been input and outputting the baseband signal as an output signal; a digital transmitter (91) that ?? modulates the output signal and transmits the modulated signal; an in-band distortion measurement unit (92) for measuring an in-band distortion amount of the output signal; an amplitude value distribution measurement unit (93) for calculating an amplitude value distribution of the output signal; a sideband distortion prediction unit (94) for predicting a sideband distortion amount occurring in the output signal by the digital transmitter (91) from the calculated amplitude value distribution; and a baseband processing controller (95) for adjusting the control signal based on the measured in-band distortion amount and the sideband distortion amount and outputting the adjusted signal.

Abstract: A transmitter, a transmission system and a transmission method whereby AM-PM distortions can be compensated with high accuracy without affecting the functions of a predistortor, a ?? modulator and so on. The transmitter includes: a baseband signal generation circuit that outputs the amplitude value and phase value of a baseband signal; a ?? modulation circuit that performs a ?? modulation of the outputted amplitude and phase values to output a pulse signal train; a power supply modulation circuit that supplies, to a pre-stage amplifier, a voltage determined in accordance with the outputted amplitude value; the pre-stage amplifier and a post-stage amplifier that amplify the outputted pulse signal train; and a filter circuit that generates an output signal from the pulse signal train as amplified and outputs the output signal. The power supply modulation circuit determines the voltage for canceling a phase error occurring in the post-stage amplifier.

Abstract: A transmitter according to the present invention includes: a baseband amplitude value distribution processor (90) for changing a distribution of an amplitude value of a baseband signal based on a control signal that has been input and outputting the baseband signal as an output signal; a digital transmitter (91) that ?? modulates the output signal and transmits the modulated signal; an in-band distortion measurement unit (92) for measuring an in-band distortion amount of the output signal; an amplitude value distribution measurement unit (93) for calculating an amplitude value distribution of the output signal; a sideband distortion prediction unit (94) for predicting a sideband distortion amount occurring in the output signal by the digital transmitter (91) from the calculated amplitude value distribution; and a baseband processing controller (95) for adjusting the control signal based on the measured in-band distortion amount and the sideband distortion amount and outputting the adjusted signal.

Abstract: A power supply device includes a switching amplification unit that supplies power to a load, a linear amplification unit that corrects an output voltage applied to the load according to an input signal, and a power supply control unit that controls the power supply of the linear amplification unit according to the input signal.

Abstract: [Problem] To provide an amplifier and an amplification method in which degradation in the quality of the output signal is reduced.

Abstract: An amplifying device includes a first pre-distorter unit outputting a modulated signal obtained by adding a phase compensation amount and an amplitude adjustment amount to an input signal, a power amplifier inputting the modulated signal and outputting an output signal obtained by amplifying the modulated signal, a power supply voltage modulation unit modulating a power supply voltage, a second pre-distorter unit controlling the power supply voltage modulation unit on the basis of amplitude information on the input signal; and a control unit controlling an operation of the first pre-distorter unit and the second pre-distorter unit, wherein the control unit includes a phase control unit controlling the phase compensation amount by using a phase coefficient, a first amplitude control unit controlling the amplitude adjustment amount by using a first amplitude coefficient, and a second amplitude control unit controlling the operation of the second pre-distorter unit by using a second amplitude coefficient.

Abstract: A power supply device includes a switching amplification unit that supplies power to a load, a linear amplification unit that corrects an output voltage applied to the load according to an input signal, and a power supply control unit that controls the power supply of the linear amplification unit according to the input signal.

Abstract: [Problem] To provide an amplifier and an amplification method in which degradation in the quality of the output signal is reduced.

Abstract: In order to improve power efficiency, a power supplying apparatus includes a switching amplification unit supplying a first load with most of electric power, and a linear amplification unit correcting an output voltage applied to the first load according to an input signal. Furthermore, an electric current which flows into the linear amplification unit at the time of the correcting is supplied to a second load from a power supply terminal of the linear amplification unit.

Abstract: It is difficult to realize the low distortion characteristics and the highly-efficient operation of the amplifying device simultaneously, therefore, an amplifying device according to an exemplary aspect of the invention includes a first pre-distorter unit outputting a modulated signal obtained by adding a phase compensation amount and an amplitude adjustment amount to an input signal; a power amplifier inputting the modulated signal and outputting an output signal obtained by amplifying the modulated signal; a power supply voltage modulation unit modulating a power supply voltage of the power amplifier; a second pre-distorter unit controlling the power supply voltage modulation unit on the basis of amplitude information on the input signal; and a control unit controlling an operation of the first pre-distorter unit and the second pre-distorter unit; wherein the control unit includes a phase control unit controlling the phase compensation amount by using a phase coefficient, a first amplitude control unit cont