Patent application number | Description | Published |
20090167372 | Automatic Adjustment Circuit, and Filter Circuit - An automatic adjustment circuit comprises a replica ( | 07-02-2009 |
20090289699 | Output conductance automatic regulation circuit of differential current output type circuit and filter circuit - Output conductance of a differential current output type circuit constituting a filter body ( | 11-26-2009 |
20100176847 | VOLTAGE-CURRENT CONVERTER AND FILTER CIRCUIT USING SAME - The voltage-current converter of the present invention includes a converter input terminal, a converter output terminal, a voltage-current conversion unit for converting voltage that is applied as input to the converter input terminal to current, and a current extraction unit for intermittently extracting current from the output terminal of the voltage-current conversion unit and supplying this current as output from the converter output terminal. | 07-15-2010 |
20110001564 | VARIABLE GAIN AMPLIFIER - A variable gain amplifier which includes a plurality of individual amplifiers and variably controls the gain by switching to and using one of the individual amplifier circuits includes an individual amplifier ( | 01-06-2011 |
20110171035 | WIND TURBINE ROTOR BLADE AND WIND-GENERATING WIND TURBINE - A wind turbine rotor blade including outer skin materials made of fiber-reinforced plastic, a crossbeam material, and a trailing edge sandwich material disposed closer to a trailing edge than a trailing edge end of the crossbeam material, wherein a reinforcing material is provided on an inner surface of the outer skin material on a front side located closer to the trailing edge than a trailing edge end of the trailing edge sandwich material. | 07-14-2011 |
20110171036 | WIND TURBINE ROTOR BLADE AND WIND-GENERATING WIND TURBINE - A wind turbine rotor blade having an outer skin material made of fiber-reinforced plastic, a sheer web, and a trailing edge reinforcing material made of fiber-reinforced plastic which forms a trailing edge, wherein the trailing edge reinforcing material includes a first recess in which a trailing edge side end of the outer skin material is accommodated, and a second recess in which a trailing edge side of an overlay is accommodated, a third recess in which a leading edge side of the overlay is accommodated is formed in a trailing edge side tip end of the outer skin material, and the tip end of the outer skin material is fixed to the first recess through an adhesive. | 07-14-2011 |
20120100002 | WIND TURBINE ROTOR BLADE - Provided is a wind turbine rotor blade that can secure a sufficient strength in a coupling portion without significant increase in weight even though a blade is increased in size because beams, which are main strength members of the separated blades, are coupled to each other by metallic coupling members. A wind turbine rotor blade including: a skin that forms a long hollow shape; and a beam that is vertically passed in a longitudinal direction to reinforce the skin from inside, wherein the beam is separated into at least two portions in the longitudinal direction, and ends of the adjacent beams are coupled to each other through a metallic coupling member having: a first flange portion opposed to the one end; a second flange portion opposed to the other end; and a connecting portion that connects these first flange portion and second flange portion, and the skin is separated into a coupling portion skin arranged at a position corresponding to the coupling member, and a main body skin arranged at a position corresponding to the beam. | 04-26-2012 |
20120231724 | FILTERING CIRCUIT WITH JAMMER GENERATOR - A filtering circuit with a jammer generator cancels a jammer in wireless signals with little degradation of the signal-to-noise ratio (SNR). The filtering circuit may include a jammer generator which acquires information of period and phase of a sinusoidal jammer signal in a composite input sinusoidal signal, which includes the jammer signal and a desired signal, and outputs a pseudo sine-wave with a period and phase corresponding with the period and phase of the jammer signal acquired, and an adder which outputs a difference between the input and output signals of the jammer generator as the desired signal. | 09-13-2012 |
20120262214 | RF SIGNAL GENERATION CIRCUIT AND WIRELESS TRANSMITTER - A wireless transmitter includes an RF signal generation circuit, a driver amplifier, and a class-D amplifier. The RF signal generation circuit detects an amplitude signal and a phase signal based on a digital baseband signal subjected to orthogonal modulation, thus generating a pulse phase signal which is High in response to the phase ranging from 0° to 180° but is Low in response to the phase ranging from 180° to 360°. The amplitude signal is subjected to sigma-delta modulation in synchronism with the pulse phase signal and further mixed with the pulse phase signal, thus producing an RF pulse signal. The RF pulse signal is input to the class-D amplifier via the driver amplifier, thus outputting a pulse voltage signal based on a reference voltage. Thus, it is possible to achieve a small-size wireless transmitter with good noise/distortion characteristics and high power efficiency. | 10-18-2012 |
20130016795 | TRANSMISSION DEVICEAANM Kunihiro; KazuakiAACI TokyoAACO JPAAGP Kunihiro; Kazuaki Tokyo JPAANM Hori; ShinichiAACI TokyoAACO JPAAGP Hori; Shinichi Tokyo JPAANM Shiikuma; KazumiAACI TokyoAACO JPAAGP Shiikuma; Kazumi Tokyo JP - A transmission device includes a pulse modulated signal generator that generates a pulse-modulated signal by changing the width of a pulse or the density of a pulse according to the magnitude of the amplitude component of an input signal while discretely changing the pulse height according to the magnitude of the amplitude, a modulated-signal generator that generates a modulated signal by integrating the pulse-modulated signal and the phase component of the input signal, a power amplifier that includes at least as many amplifiers as the number of the discrete amplitude levels of the modulated signal, changes the number of amplifies that amplify the modulated signal on the basis of the value of the amplitude level of the modulated signal, combines outputs of the amplifiers, and outputs a combined output, and an output filter that eliminates a square-wave component from the output of the power amplifier. | 01-17-2013 |
20130127556 | POWER SUPPLY MODULATOR AND METHOD FOR CONTROLLING SAME - A power amplifier amplifies a radio signal. Negative feedback is applied to a linear amplifier and the linear amplifier receives an envelope signal. A pulse current modulator is connected to a power supply terminal of a power amplifier and an output terminal of the linear amplifier via an inductor, and outputs a pulse current according to a control signal generated from the envelope signal. A diode has an anode connected to an output terminal of a direct current source and a cathode connected to an output terminal of the pulse current modulator. A switching element is disposed between the output terminal of the direct current source and a ground potential, and is controlled by the control signal. | 05-23-2013 |
20130142283 | TRANSMITTER AND METHOD FOR CONTROLLING SAME - An RF signal generator divides an input radio signal into an amplitude signal and a phase signal and outputs the amplitude signal and the phase signal. A switching amplifier amplifies the radio signal with the amplitude signal and the phase signal. The switching amplifier includes at least one variable current sources that is controlled by the amplitude signal and supplies a current to the switching amplifier. The switching amplifier includes at least one switching elements that connects the variable current sources to one of a terminal connected a ground potential and an output terminal of the switching amplifier according to the phase signal. | 06-06-2013 |
20130177062 | TRANSMITTER, CONTROL METHOD, COMPUTER PROGRAM AND DELTA-SIGMA MODULATOR - In order to improve radio characteristic in a transmitter, there are included a ΔΣ modulation means that ΔΣ modulates a given input signal; and a control means that changes parameters of the ΔΣ modulation means in accordance with a given condition. | 07-11-2013 |
20130342185 | POWER SUPPLYING APPARATUS AND CONTROL METHOD THEREOF - 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. | 12-26-2013 |
20140205041 | RF SIGNAL GENERATING CIRCUIT, AND TRANSMITTER - An RF signal generating circuit that generates, from a digital signal, an RF pulse signal to be radio-transmitted. It includes a polar converter generating an amplitude signal and a phase signal from the digital signal; a signal decomposer receiving the amplitude signal as an input signal, and generates two signals, a pulse width control signal and a residual signal; a delta sigma modulator subjecting the residual signal to delta-sigma modulation; a pulse width modulator subjecting the phase signal to pulse modulation in accordance with the pulse width control signal, and outputting a pulse phase signal; and a mixer that mixes a signal output from the delta sigma modulator and the pulse phase signal to output the RF pulse signal. The signal decomposer generates the pulse width control and residual signals if a product of a fundamental wave component of the pulse phase and residual signals equals the amplitude signal. | 07-24-2014 |
20140219384 | DIGITAL MODULATOR - To provide a digital modulator including: a signal adjuster ( | 08-07-2014 |
20150049842 | TRANSMITTER AND TRANSMITTING METHOD - A transmitter according to the present invention includes a level detector that detects the level value of an input signal, from among a predetermined number of level values; an upstream-side signal adjusting unit that amplifies said input signal and shifts said input signal for an offset amount based on an output signal of said level detector; a digital-sigma modulator having a quantizer that quantizes an output signal of said upstream-side signal adjusting unit with a predetermined number of bits, and a downstream-side signal adjusting unit that amplifies an output signal of said delta-sigma modulator and shifts the output signal of said delta-sigma modulator for an offset amount based on the output signal of said level detector. | 02-19-2015 |
20150084691 | SWITCHING AMPLIFIER AND TRANSMITTER USING SAME - The present invention is applied to a switching amplifier that includes a first high-side gate and a first low-side gate having output terminals connected together, and a high-side driver and a low-side driver that drive the first high-side gate and the first low-side gate, respectively. In the switching amplifier of the present invention, the high-side driver includes an input switching amplifier that uses the output terminal of the first high-side gate as a power source. | 03-26-2015 |