Abstract: A power adjustment method includes: measuring output power that is obtained when input power to be amplified in a linear region is input to a power amplifier configured to amplify input power linearly in the linear region and amplify input power nonlinearly in a nonlinear region; deriving a straight line connecting a measurement point corresponding to the measured output power and a boundary point between the linear region and the nonlinear region in a coordinate plane representing input/output characteristics; acquiring information on an approximate equation that is stored in advance in correspondence with the measured output power, the approximate equation representing a relation between input power and output power in the nonlinear region; and storing information on the derived straight line and the acquired information on the approximate equation in a semiconductor integrated circuit provided at a preceding stage of the power amplifier.

Abstract: A power adjustment method includes: measuring output power that is obtained when input power to be amplified in a linear region is input to a power amplifier configured to amplify input power linearly in the linear region and amplify input power nonlinearly in a nonlinear region; deriving a straight line connecting a measurement point corresponding to the measured output power and a boundary point between the linear region and the nonlinear region in a coordinate plane representing input/output characteristics; acquiring information on an approximate equation that is stored in advance in correspondence with the measured output power, the approximate equation representing a relation between input power and output power in the nonlinear region; and storing information on the derived straight line and the acquired information on the approximate equation in a semiconductor integrated circuit provided at a preceding stage of the power amplifier.

Abstract: A radio communication circuit includes a power amplifier configured to amplify a signal and output the amplified signal, an envelope detector configured to extract an envelope of an input signal inputted to the power amplifier, an offset generator configured to generate an offset value for a power supply voltage to be applied to the power amplifier, based on a distortion amount in an output signal from the power amplifier, and a power supply voltage modulator configured to control the power supply voltage to be applied to the power amplifier based on the envelope extracted and the offset value generated.

Abstract: A radio communication circuit includes a power amplifier configured to amplify a signal and output the amplified signal, an envelope detector configured to extract an envelope of an input signal inputted to the power amplifier, an offset generator configured to generate an offset value for a power supply voltage to be applied to the power amplifier, based on a distortion amount in an output signal from the power amplifier, and a power supply voltage modulator configured to control the power supply voltage to be applied to the power amplifier based on the envelope extracted and the offset value generated.

Abstract: A radio communication device includes a semiconductor integrated circuit including a transmission path and a reception path; a determination unit that determines whether firmware used for processing in the semiconductor integrated circuit is updated; an input unit that inputs predetermined test data to the transmission path when it is determined that the firmware is updated; a measurement unit that measures a time until the test data returns from the reception path; and a processor that compares the measured time with a reference time, and adjusts a delay time of a signal based on a result of the comparison, wherein the semiconductor integrated circuit includes a bypass that connects the transmission path and the reception path to turn back the test data to the reception path at a stage prior to conversion of a frequency of the test data to the radio frequency.

Abstract: An antenna receives an RF signal and an RF signal at different frequency bands. An oscillator outputs a local oscillator signal at a frequency f1. An oscillator outputs a local oscillator signal at a frequency f2. A modulator modulates the frequency based on the local oscillator signal at the frequency f1 and the local oscillator signal at the frequency f2, and generates a plurality of local oscillator signals at different frequencies. A frequency converter mixes the plurality of local oscillator signals, at different frequencies, generated by the modulator, with the RF signal and the RF signal, and generates baseband signals of the RF signal and the RF signal. A signal processor performs a predetermined process for the baseband signals generated by the frequency converter.

Abstract: A wireless terminal device includes a transmitter, a receiver, a memory, and a processor coupled to the memory, the processor being configured to measure a transmission processing time and a reception processing time, the transmission processing time being a time for the transmitter to carry out transmission processing, the reception processing time being a time for the receiver to carry out reception processing, and adjust a transmission timing of the transmitter on the basis of the transmission processing time and a reception timing of the receiver on the basis of the reception processing time.

Abstract: The invention relates to a portable terminal such as a portable telephone terminal and so forth for effecting communication, information processing and so forth, and to provide the portable terminal and a master slave portable telephone system capable of rendering a transmission and/or reception mode of information to be multi-functional to enhance communication function, thereby enhancing the convenience thereof. The portable terminal comprises an information transmission and/or reception part for effecting transmission and/or reception of information, a radio communication part for effecting communication by radio, and an information processing part for processing information.

Abstract: The invention relates to a portable terminal such as a portable telephone terminal and so forth for effecting communication, information processing and so forth, and to provide the portable terminal and a master slave portable telephone system capable of rendering a transmission and/or reception mode of information to be multi-functional to enhance communication function, thereby enhancing the convenience thereof. The portable terminal comprises an information transmission and/or reception part for effecting transmission and/or reception of information, a radio communication part for effecting communication by radio, and an information processing part for processing information.

Abstract: The invention relates to a portable terminal such as a portable telephone terminal and so forth for effecting communication, information processing and so forth, and to provide the portable terminal and a master slave portable telephone system capable of rendering a transmission and/or reception mode of information to be multi-functional to enhance communication function, thereby enhancing the convenience thereof. The portable terminal comprises an information transmission and/or reception part for effecting transmission and/or reception of information, a radio communication part for effecting communication by radio, and an information processing part for processing information.

Abstract: The invention relates to a portable terminal such as a portable telephone terminal and so forth for effecting communication, information processing and so forth, and to provide the portable terminal and a master slave portable telephone system capable of rendering a transmission and/or reception mode of information to be multi-functional to enhance communication function, thereby enhancing the convenience thereof. The portable terminal comprises an information transmission and/or reception part for effecting transmission and/or reception of information, a radio communication part for effecting communication by radio, and an information processing part for processing information.

Abstract: The invention relates to a portable terminal such as a portable telephone terminal and so forth for effecting communication, information processing and so forth, and to provide the portable terminal and a master slave portable telephone system capable of rendering a transmission and/or reception mode of information to be multi-functional to enhance communication function, thereby enhancing the convenience thereof. The portable terminal comprises an information transmission and/or reception part for effecting transmission and/or reception of information, a radio communication part for effecting communication by radio, and an information processing part for processing information.

Abstract: The invention relates to a portable terminal such as a portable telephone terminal and so forth for effecting communication, information processing and so forth, and to provide the portable terminal and a master slave portable telephone system capable of rendering a transmission and/or reception mode of information to be multi-functional to enhance communication function, thereby enhancing the convenience thereof. The portable terminal comprises an information transmission and/or reception part for effecting transmission and/or reception of information, a radio communication part for effecting communication by radio, and an information processing part for processing information.