Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Makoto Sakakura

Kaoru Ishida

Toru Matsuura

Hisashi Adachi

Seiji Fujiwara

Toshio Ishizaki

Hiroaki Kosugi

Hiroyuki Nakamura

Toshiaki Nakamura

Toru Yamada

Toshifumi Nakatani

Yoshihiro Nakagawa

Takaaki Maegawa

Yukio Hiraoka

Toshiakira Andoh

Kouji Takinami

Koji Hashimoto

Koichi Ogawa

Hiroshi Kagata

Hiroyuki Handa

Koji Takinami

Kenichi Takahashi

Toshimitsu Matsuyoshi

Tomoki Uwano

Toshio Obara

Takeshi Miura

Minoru Tachibana

Nobuo Fuse

Takayuki Matsumoto

Toshiaki Andoh

Junichi Takada

Jyunichi Yoshizumi

Hiroyuki Itokawa

Kouji Hashimoto

Hisanaga Miyoshi

Junichi Yoshizumi

A voltage controlled oscillator, a variable frequency divider, a phase comparator, and a loop filterform a Phase Locked Loop (PLL). A sigma-delta modulatorsigma-delta modulates data obtained by adding a fractional part Mof the frequency division factor data with modulation data X by using an output signal of the variable frequency divideras a clock. An output signal of the sigma-delta modulatoris added to an integral part Mof the frequency division factor data, and the resultant data becomes effective frequency division factor dataof the variable frequency divider. An output signal of the sigma-delta modulatoralso becomes control dataafter passing through a D/A converter, a low-pass filter, and an amplitude adjustment circuit. The control datais inputted into a frequency modulation terminal of the voltage controlled oscillator. Therefore, it is possible to provide a frequency modulator that can use a reference signal source having no frequency modulation function, and perform modulation over a wide range of frequencies based on a digital modulation signal.

Frequency modulator, frequency modulating method, and wireless circuit

In a signal generating circuit SG, a 90 -degree dividergenerates, from a local oscillation signal Ssupplied through an input terminal, an intermediate reference phase signal ISand an intermediate quadrature signal ISorthogonal in phase to the intermediate reference phase signal ISfor output to mixersand, respectively. A shiftershifts the phase of the local oscillation signal supplied through an input terminalby a predetermined amount to generate a shift signal Sfor output through a dividerto the mixersand. The mixermixes the input intermediate reference phase signal ISand the input shift signal Sto generate a reference phase signal S. The mixermixes intermediate quadrature signal ISand the input shift signal Sto generate a quadrature signal S. With this, it is possible to provide a signal generator capable of generating highly-accurate, high-frequency reference phase signals and quadrature signals.

Signal generating circuit for generating a reference phase signal and a quadrature signal

A transmitting/receiving switch, in which a transmission terminal connected to a transmission circuit is connected to an antenna terminal through a first switching element, a filter for attenuating harmonic contents in a transmission signal, a phase-shift circuit for significantly increasing an impedance from a node toward said transmission terminal in a reception frequency band by phase-adjusting the amount of phase shift by performing phase adjustment according to the amount of the phase shift generated by said filter. Furthermore, the antenna terminal connected to an antenna ANT is connected to a reception terminal through the node and a second switching element, and the reception terminal is connected to a reception circuit Rx.

Transmitting/receiving switch

An amplitude frequency characteristic adjustment circuitis provided downstream of and connected to a distortion generation circuit. An amplitude difference between low-frequency-side and high-frequency-side distortion voltages is adjusted by the amplitude frequency characteristic adjustment circuit, and then their amplitudes and phases are adjusted by a vector adjustment circuit. This configuration makes it possible to suppress simultaneously both of low-frequency-side and high-frequency-side distortion voltages of a distortion generated by a wide-band class-AB power amplifier even if they are different in amplitude and phase.

Predistortion circuit, low-distortion power amplifier, and control methods therefor

A voltage controlled oscillatora variable frequency dividera phase comparatorand a loop filterform a Phase Locked Loop (PLL). A sigma-delta modulatorsigma-delta modulates data obtained by adding a fractional part Mof the frequency division factor data with modulation data X by using an output signal of the variable frequency divideras a clock. An output signal of the sigma-delta modulatoris added to an integral part Mof the frequency division factor data, and the resultant data becomes effective frequency division factor dataof the variable frequency dividerAn output signal of the sigma-delta modulatoralso becomes control dataafter passing through a D/A convertera low-pass filterand an amplitude adjustment circuitThe control datais inputted into a frequency modulation terminal of the voltage controlled oscillatorTherefore, it is possible to provide a frequency modulator that can use a reference signal source having no frequency modulation function, and perform modulation over a wide range of frequencies based on a digital modulation signal.

An antenna duplexer has an antenna terminal;

Antenna duplexer and mobile communication device using the same

Predistortion circuit and power amplifier

A high-Q inductor for high frequency, having a plurality of inductor elements formed in a plurality of IC wiring layers with a connection formed therebetween. The directions of the magnetic fields generated by the respective inductor elements are substantially the same. With this construction, the section of the inductor is increased reducing the serial resistance component and an influence of a skin effect in a high-frequency range is eliminated increasing the Q value.

High-Q inductor for high frequency

To provide a power amplifier circuit with a smaller circuit scale and with good characteristics over a wide range of load impedance. A configuration includes: a DC/DC converter which delivers a supply voltage from a battery to a power amplifier according to control commands from a control circuit a directional coupler which outputs a signal from one terminal according to signal waves received by an antenna from a second matching circuit and outputs a signal from another terminal according to reflected waves received from the antenna and detectors and or the like.

Power amplifier circuit, control method for power amplifier circuit, and portable terminal apparatus for mobile communication

Growing community of inventors

Uji, Japan

Makoto Sakakura