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| Application No. | Application Title | Issue Date |
| 20110280334 | DIGITAL AMPLITUDE MODULATOR AND POLAR TRANSMITTER USING THEREOF The present invention provides a digital amplitude modulator and polar transmitter using the same. The polar transmitter includes: a polar converter for converting an input signal into an amplitude information signal and a phase information signal, and outputting the co... | 11/17/2011 |
| 20110183636 | RADIO FREQUENCY TRANSMITTER HAVING AN AMPLIFIER WITH POWER SUPPLY MODULATION A circuit including a carrier amplifier having an input, an output, a first transistor coupled to a first power supply voltage terminal for receiving a modulated power supply voltage, and a second transistor coupled to a second power supply voltage terminal for receivin... | 07/28/2011 |
| 20110121911 | MODULATION CIRCUIT AND SEMICONDUCTOR DEVICE INCLUDING THE SAME A modulation circuit includes a load and a transistor serving as a switch. The transistor has an oxide semiconductor layer in which hydrogen concentration is 5×1019/cm3 or less. The off-state current of the transistor is 1×10−13 A or... | 05/26/2011 |
| 20110074518 | QUADRATURE AMPLITUDE MODULATOR AND QUADRATURE AMPLITUDE MODULATION METHOD A quadrature amplitude modulator is provided. An oscillator generates an in-phase carrier signal having a rectangular wave, a trapezoidal wave or a waveform similar to these, and a quadrature carrier signal, the phase of which is shifted by ¼ cycle relative to the in-p... | 03/31/2011 |
| 20100327988 | REDUCING THE DISTORTION OF APPLIED MODULATION Signal modulation apparatus for applying a modulation signal to a carrier signal, the apparatus comprising: an amplitude modulator for modulating the amplitude of the carrier signal in accordance with a control signal; first mixing means for mixing together fractions of... | 12/30/2010 |
| 20100321127 | TEST APPARATUS FOR DIGITAL MODULATED SIGNAL A test apparatus includes digital modulators provided in increments of multiple channels. A baseband signal generator performs retiming of data input as a modulation signal for the in-phase (quadrature) component, using a timing signal the timing of which can be adjuste... | 12/23/2010 |
| 20100301961 | PHASE LOCKED LOOP A phase locked loop comprising: an oscillator for generating an output signal of a frequency that is dependent on an input to the oscillator; sampling means for generating a sequence of digital values representing the output of the oscillator at moments synchronised wit... | 12/02/2010 |
| 20100297965 | AMPLITUDE MODULATION CONTROLLER FOR POLAR TRANSMITTER Apparatus for generating a modulation signal for use in modulating the power supply of a power amplifier uses coarse and fine control for controlling the amplitude of the modulation signal, and thereby controlling the output power of the power amplifier. The modulation ... | 11/25/2010 |
| 20100134198 | METHOD FOR THE PRODUCTION OF A DIGITALLY MODULATED HIGH-FREQUENCY SIGNAL In a method for the production of a radio-frequency signal modulated as a function of a low-frequency digital data stream, a clock signal is provided having a frequency that is at least four times as high as the frequency of the radio-frequency signal to be produced. Th... | 06/03/2010 |
| 20100109789 | Radio frequency amplifier with digital amplitude modulation and method for controlling the delivering of power A digital amplitude modulator is configured to modulate the amplitude of an input carrier signal based on input digital data and generate a corresponding output signal. The digital amplitude modulator includes a first variable gain amplifier for receiving the input carr... | 05/06/2010 |
| 20090267738 | SIGNAL CONVERSION DEVICE, RADIO FREQUENCY IDENTIFICATION (RFID) TAG, AND METHOD FOR OPERATING THE RFID TAG A signal conversion device, a radio frequency identification (RFID) tag, and a method for operating the RFID tag. The RFID tag has an electrically erasable programmable read-only memory module for storing RFID tag information and transmitting the RFID tag information; a... | 10/29/2009 |
| 20090231053 | Modulator A modulator includes a first converter, a second converter and a mixer. The first converter is configured to receive a first bit and provide a first current that is a function of the first bit. The second converter is configured to receive a second bit and provide a sec... | 09/17/2009 |
| 20090128247 | INTERMITTENT OPERATION CIRCUIT AND MODULATION DEVICE There is provided a small-size, low-power-consumption intermittent operation circuit capable of obtaining an output waveform having a rapid rise and fall. The intermittent operation circuit includes an active circuit (106), a first control signal generation circu... | 05/21/2009 |
| 20080246550 | Selective envelope modulation enabling reduced current consumption A modulation system includes an amplitude modulation path and a phase modulation path coupled to the amplitude modulation path. One of the amplitude modulation path and the phase modulation path receive a reduced current such that the reduced current reduces power consu... | 10/09/2008 |
| 20060220759 | CONTACTLESS IC CARD SYSTEM In a contactless IC card system, a modulating circuit manufactured in an IC form is operable at a high power efficiency. The demodulating apparatus is configured to include: first signal output means for outputting a first output signal having a predetermined phase with... | 10/05/2006 |
| 20060109061 | System and method for narrow bandwidth amplitude modulation A method and system for narrow band amplitude modulation in which audio is sampled periodically and held constant except during brief periods which are close to zero crossings of the carrier signal comprising an RF sine wave. The result is a modulated signal with sideba... | 05/25/2006 |
| 20060044072 | Method and apparatus for providing a modulation current Techniques are disclosed for providing modulation current that includes output impedance compensation with a feed-forward bandwidth enhancement and pre-distortion modulation to control waveform transition symmetry. A feedback circuit senses output node voltage and incre... | 03/02/2006 |
| 20060006955 | Contactless IC card system In a contactless IC card system, a modulating circuit manufactured in an IC form is operable at a high power efficiency. The demodulating apparatus is configured to include: first signal output means for outputting a first output signal having a predetermined phase with... | 01/12/2006 |
| 20050110590 | Outphasing modulator Briefly, an apparatus having an outphasing modulator that may provide at least first and second outphased signals to a power amplifier. The outphasing modulator may control amplitude of the first and second outphased signals by an amplitude modulation controller which m... | 05/26/2005 |
