Patent application number | Description | Published |
20080261543 | TRANSMISSION CIRCUIT AND COMMUNICATION DEVICE - Provided is a transmission circuit capable of operating with high linearity and with low noise. An AM variable fc filter | 10-23-2008 |
20090060089 | POLAR MODULATION TRANSMITTER CIRCUIT AND COMMUNICATIONS DEVICE - Provided is a transmitter circuit capable of operating with low distortion and high efficiency even in a modulation method using wide modulation bandwidth. In the transmitter circuit, a signal generation section ( | 03-05-2009 |
20090098839 | Transmitter and communication apparatus - A modulator | 04-16-2009 |
20100003932 | TRANSMITTER AND COMMUNICATION APPARATUS USING THE SAME - A signal generating section | 01-07-2010 |
20120094727 | POWER AMPLIFICATION CIRCUIT AND COMMUNICATION APPARATUS - Provided is a power amplification circuit capable of quickly and highly accurately preventing an output power and a current of a power amplifier from fluctuating when an antenna load changes. A power amplifier | 04-19-2012 |
20120106402 | POLAR MODULATOR - A polar modulator of the present invention includes: a first function block which generates an amplitude signal and a phase signal; a second function block which adjusts the signal delay between the amplitude signal and the phase signal; a third function block which allows the low frequency component of the amplitude signal to pass therethrough; a fourth function block which modulates the phase of the phase signal; a fifth function block which outputs a modulation voltage, based on the amplitude signal; a sixth function block which modulates the amplitude of the phase signal, based on the modulation voltage; a seventh function block which measures the temperature of at least one function block; and an eighth function block which calculates a compensation amount for the signal delay, based on the measured temperature. The second function block adjusts the signal delay, based on the compensation amount. | 05-03-2012 |
20120189081 | TRANSMISSION CIRCUIT AND COMMUNICATION APPARATUS USING POLAR MODULATION METHOD - Provided is a transmission circuit which can adjust a difference between signal delay amounts in the amplitude path and the phase path with a low power consumption. An amplitude modulation section | 07-26-2012 |
20130063253 | RFID DEVICE, HOST, RFID-EMBEDDED APPARATUS, AND METHOD OF CONTROLLING RFID DEVICE - A radio frequency identification (RFID) device includes: a contact interface for wired communication with a host; a contactless interface for contactless communication with a reader/writer; a command processing unit that obtains a command from the reader/writer in the contactless communication and process the command, the command instructing a data access; and a memory that holds data. The command processing unit determines a communication mode, and (i) executes the data access instructed in the command between the reader/writer and the memory, when the communication mode is determined as a first communication mode, and (ii) executes the data access instructed in the command between the reader/writer and the host, when the communication mode is determined as a second communication mode. | 03-14-2013 |
20140104044 | COMMUNICATION APPARATUS - An RFID tag includes an antenna coil configured to transmit and receive a signal through near field communication, a signal processing circuit configured to process the signal transmitted and received by the antenna coil, a capacitive element arranged in series between the antenna coil and the signal processing circuit, and a control unit configured to control the capacity value of the capacitive element. The control unit changes the capacity value of the capacitive element according to whether a voltage is applied from an external power supply. | 04-17-2014 |