Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Pansonic Corporation

Panasonic Intellectual Property Management Co., Ltd.

Kaoru Ishida

Hiroaki Kosugi

Seiji Fujiwara

Toru Matsuura

Masayuki Miyaji

Toshimitsu Matsuyoshi

Makoto Sakakura

Takashi Enoki

Mikihiro Shimada

Maki Nakamura

Akira Kato

Ryo Kitamura

Shigeru Morimoto

Hiroyuki Nakamura

Akihiko Matsuoka

Kazunori Watanabe

Hiroshi Isono

Hisashi Adachi

Tsuguhiro Korenaga

Hiroshi Komori

Hiroshi Haruki

Naoki Komatsu

Yuji Saito

Hiroshi Iwai

Toshio Ishizaki

Toru Yamada

Yoshihiro Hara

Koichi Ogawa

Toshifumi Nakatani

Makoto Nakamura

Hiroyuki Asakura

Hidehiko Kurimoto

Hiroshi Yajima

Shin'ichi Kugou

Nobuo Fuse

Yoichi Morinaga

Naoki Takachi

Hideki Yagita

Hikaru Ikeda

Youichi Morinaga

Hidenobu Kato

Takatoshi Kawai

Shunsuke Hirano

Tomoya Urushihara

Masakatsu Maeda

Fujio Sasaki

Shoichi Kitazawa

Yosuke Mitani

Takeshi Miura

Toshio Obara

Taichi Ikedo

Yukihiro Omoto

Makoto Fujikawa

Kazuhiko Ikeda

Seiichi Yamaguchi

Yoshitaka Nagatomi

Toshiaki Andoh

Mikio Hanabusa

Katsuhiko Morioka

Keiichi Nakayama

Isao Nasuno

Manabu Yamaguchi

Tadanori Fujisawa

Makoto Aisaka

Kazuhiko Nakayama

Kouji Hashimoto

Hisanaga Miyoshi

Shoji Yoshida

Takuji Yoneda

Toshiakira Ando

Tsukasa Fukui

Rie Takeuchi

Junichi Yasuno

When switching the mode of a power amplifier between compressed mode and uncompressed mode, accurate transmission power control is realized. A transmission power control method includes setting a power setting value of mode to switch to, such that an inter-mode output power error is canceled (equal to step ST), calculating an intra-mode output power error from the power setting value of the mode to switch to (equal to step ST), calculating a gain linearity value based on the power setting value of the mode to switch to and an output power error of the intra-mode (equal to step ST), and resetting the power setting value of the mode to switch to based on the gain linearity value (equal to steps STand).

Transmission power control method and transmission power control apparatus

Provided is a multiband wireless apparatus that, even if the number of supported frequency bands increases, suppresses increase in the number of components, and completes cell search within a specified time. In a multiband wireless apparatus (), a reception channel to which a current reception channel is going to be next switched is set in advance for one of a tunable duplexer () and a reception dedicated tunable filter () that is not connected to an antenna. An antenna switch (), in a normal transmission/reception mode, connects the antenna to the tunable duplexer (), and in a compressed mode, switches the connection of the antenna between the tunable duplexer () and the reception dedicated tunable filter ().

Multiband wireless apparatus

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.

Polar modulator

A transmitter circuit includes a first synthesizer section, and a second synthesizer section which consumes less current than the first synthesizer section. The transmitter circuit performs switching such that the first synthesizer section is operated and the second synthesizer section is powered off in polar modulation, and the second synthesizer section is operated and the first synthesizer section is powered off in quadrature modulation, thereby reducing consumed power. While the first synthesizer section is operating, calibration for an oscillation frequency is performed, and when the operation is stopped, a calibration value is stored. When an operation of the first synthesizer section is restarted, the stored calibration value is corrected by using temperature change, thereby enhancing calibration accuracy and preventing degradation in quality of a transmission signal.

Wireless communication apparatus

Provided is a transmitter apparatus including: a signal conversion section for, in polar modulation, converting input data into an amplitude-component signal and a phase-component signal, and in quadrature modulation, converting input data into an in-phase component signal and a quadrature component signal; a carrier wave generation section for outputting a carrier wave; a mixer section for, in quadrature modulation, generating a quadrature modulation signal; a regulator for, in polar modulation, outputting a supply voltage control signal; and a power amplifier for, in polar modulation, amplifying the supply voltage control signal and superimposing the resultant signal onto the carrier wave, thereby generating a transmission signal, wherein in polar modulation, the carrier wave generation section outputs the carrier wave modulated with respect to phase component, and in quadrature modulation, the carrier wave generation section outputs the carrier wave that is yet to be modulated.

Transmitter apparatus

A transmission circuit according to the present invention includes: an amplitude signal driving section () that generates a control voltage based on an amplitude signal in a high-output mode, and generates a control voltage at a predetermined level and a bias current based on the amplitude signal in a low-output mode; a variable gain adjustment section () that adjusts a power level of the phase signal; and a power amplifier () which amplitude-modulates the phase signal having the adjusted power level on the basis of the control voltage, in the high-output mode, and to a power supply terminal of which the control voltage is supplied and which amplitude-modulates the phase signal having the adjusted power level on the basis of the bias current, in the low-output mode. In a specific region in a low-output region and close to a high-output region, the variable gain adjustment section () adjusts the power level of the phase signal to a predetermined upper-limit level, and the amplitude signal driving section () adjusts a gain of the power amplifier () to obtain a desired output power level.

Transmission circuit

Provided is a transmission circuit capable of compensating a variation in output power caused due to a temperature change or an individual variability when the operation mode is switched without an increase in the size of the transmission circuit which switches the operation mode between a linear operation mode and a nonlinear operation mode, and capable of suppressing the deterioration of the quality of a transmission signal. In the transmission circuit, a gain setting section () sets the gain (target gain) of a variable gain amplifier (), to a value which enables the variable gain amplifier () to operate linearly and corresponds to a comparison result (output error level) obtained through comparison between the target level of the variable gain amplifier () corresponding to the set power level of the transmission signal and the power level of an output signal of the variable gain amplifier () detected by a power detection section (). The variable gain amplifier () amplifies an amplitude phase modulation signal or a phase modulation signal (phase path signal) in accordance with the target gain set by the gain setting section ().

Transmission circuit and transmission method

A transmission circuit () according to the present invention includes an RF-IC (), an EM-IC (), and a power amplifier (). The EM-IC () includes a DC-DC converter (), a transistor (), a low-dropout regulator (), and a regulator output selector switch (). After an elapse of a predetermined time from a time when an operation mode of the transmission circuit has switched from a polar modulation mode to a quadrature modulation mode to a time when a power supply voltage for the quadrature modulation mode output from the DC-DC converter () stabilizes at a desired value, the regulator output selector switch () switches a connection destination of a gate of the transistor () to a fixed potential, and outputs as a control voltage the power supply voltage for the quadrature modulation mode output from the DC-DC converter ().

A transmitter circuit is provided which is capable of reducing modulation distortion even when an output power of a power amplifying sectionis low. A signal generation sectiongenerates an amplitude signal and a phase signal. A regulatoroutputs a current based on the amplitude signal. A phase modulation sectionphase-modulates the phase signal, and outputs a phase-modulated signal. The power amplifying sectionreceives the current which is based on the amplitude signal and supplied as a bias current from the regulator, and amplifies the phase-modulated signal by using the supplied current. Further, to the power amplifying section, a predetermined DC voltage is supplied as a collector voltage.

Transmitter circuit and communication apparatus

The polar modulation apparatus of the present invention can control the output power of a transmission signal over a wide range and compensate characteristic degradation reliably upon temperature change. Polar modulation transmission apparatusis provided with: temperature sensor; temperature compensation section-that corrects an amplitude signal and performs temperature compensation for transmission power amplification section; temperature compensation section-that corrects a power amplification signal and performs temperature compensation for power adjustment section; and correction value setting sectionthat sets correction values for temperature compensation section-and temperature compensation section-, and, while only the amplitude signal is corrected according to a measurement result in temperature sensorin the first mode, the amplitude signal and the power adjustment signal are corrected according to a measurement result in the second mode.

Polar modulation transmission apparatus and polar modulation transmission method

A transmission circuit switches a bias circuit without allowing a power amplifier to enter a non-bias state. A first bias circuit supplies a first bias signal to a power amplifier, and a second bias circuit supplies a second bias signal to the power amplifier. A first delay circuit delays the switching of an operation of the first bias circuit using a first delay time, and a second delay circuit delays the switching of an operation of the second bias circuit using a second delay time. The first bias circuit and the second bias circuit are both simultaneously operated for a predefined time period, in order to prevent a transistor for amplification from entering a non-bias state when switching an operation mode of the power amplifier.

Transmission circuit for bias control of power amplifier

A radio transmission apparatus according to the present invention detects an output current of a power supply section that varies in response to a variation of the output impedance of an amplification section, and corrects a distortion of the input/output characteristic of the amplification section by using an LUT corresponding to the detected output current. In addition, a threshold used for switching an LUT is caused to be different depending on a switching direction between LUTs, thereby suppressing frequent occurrence of switching of the LUT.

Radio transmission apparatus and radio transmission method

Provided are a PLL modulation circuit, a radio transmission device, and a radio communication device capable of maintaining a modulation accuracy for modulation of a wide band. The PLL modulation circuit () includes: a PLL unit (), first modulation signal input means for inputting a first modulation signal to a divider () or a phase comparator () of the PLL unit (); second modulation signal input means for DA converting the digital modulation signal in a DA converter () to generate an analog second modulation signal and inputting it to a voltage control oscillator () of the PLL unit (); a second divider for dividing the output signal of the voltage control oscillator (); and control means for generating a center frequency control signal, a gain control signal, and a second division ration control signal according to the channel selection signal and the control voltage inputted to the voltage control oscillator () and supplying them to the divider (), the DA converter (), and the second divider (), respectively.

PLL modulation circuit, radio transmission device, and radio communication device

A current control circuit () recognizes whether or not a transmission signal is transmitted based on a control signal outputted from a transmission signal control circuit (). When the transmission signal is transmitted, the current control circuit () controls a current flowing into a reception circuit () in accordance with control information representing any of at least two modes where the transmission signal is transmitted. When no transmission signal is transmitted, the current control circuit () controls the current flowing into the reception circuit () in accordance with control information representing a mode where no transmission signal is transmitted.

Wireless circuit device

Growing community of inventors

Osaka, Japan

Kaoru Ishida