Fujitsu Corporation

Takashi Tanii

Tadayoshi Yamamoto

Yasuhiro Murakami

Yusuke Yamamori

Yasuaki Takeuchi

Mikio Hayashihara

Mitsunori Maeda

Nobuhide Hachiya

Manabu Murakami

Masahiko Hirao

Mitsuhiko Manpo

Kazushige Kishigami

Naohito Takayama

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.

Power adjustment method, computer-readable recording medium and power adjustment apparatus

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.

Radio communication circuit and radio communication apparatus

An antenna receives an RF signal and an RF signal at different frequency bands. An oscillator outputs a local oscillator signal at a frequency f. An oscillator outputs a local oscillator signal at a frequency f. A modulator modulates the frequency based on the local oscillator signal at the frequency fand the local oscillator signal at the frequency f, 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.

Wireless communication device and control method for wireless communication device

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. The portable terminal can effect transmission and/or reception of information relative to another portable terminal by any of a master terminal made up of the information transmission and/or reception part and the information processing part, a slave terminal made up of the information transmission and/or reception part and the radio communication part, and a normal terminal configured by combining the radio communication part with the information processing part via the information transmission and/or reception part.

Portable terminal and portable telephone

Portable terminal, portable telephone and master slave portable telephone system using the portable terminal

Growing community of inventors

Sapporo, Japan

Takashi Tanii