Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Mikihiro Shimada

Hiroyuki Asakura

Tsuguhiro Korenaga

Masanori Iida

Kaoru Ishida

Hiroshi Komori

Ryo Kitamura

Hisashi Adachi

Yoshihiro Tomita

Toshifumi Nakatani

Seiji Karashima

Satoru Tomekawa

Masakatsu Maeda

Yasushi Nakagiri

Nobuki Itoh

Kunio Hibino

The present invention provides a CMOS-inverter-type frequency divider circuit that can further reduce power consumption. The CMOS-inverter-type frequency divider circuit includes: a plurality of CMOS inverters that contribute to realizing a frequency division function; a frequency division control section for performing control such that some or all of the plurality of CMOS inverters are intermittently driven at the respective different timings in accordance with an input signal; and a drive power supplying section for supplying powers for driving the plurality of CMOS inverters, and for, based on state information indicating whether VCO sub band selection or normal transmission is performed, switching some or all of the powers for the plurality of CMOS inverters between the VCO sub band selection and the normal transmission.

CMOS-inverter-type frequency divider circuit, and mobile phone including the CMOS-inverter-type frequency divider circuit

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

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

A switch circuit device with improved insertion loss characteristics and isolation characteristics is provided. The switch circuit of the present invention includes a plurality of n-ch MOSFETs whose gates are connected together and whose drains and sources are connected in series, a p-ch MOSFET whose gate is connected to the gates of the plurality of n-ch MOSFETs and whose drain is connected to the source and drain of at least one pair of adjacent n-ch MOSFETs, and a voltage changing circuit for applying a low voltage to the source of the p-ch MOSFET while a high-level control voltage is applied to the gate of the p-ch MOSFET, and a high voltage to the source of the p-ch MOSFET while a low-level control voltage is applied to the gate of the p-ch MOSFET.

Switch circuit device, and wireless circuit device and sampling circuit device employing the same

A frequency divider in accordance with the present invention includes a plurality of latch circuits connected together in series to which a clock signal and an inversion clock signal are input, an inverter circuit to which an output signal from a last connected one of the latch circuits is input, an output terminal to which an output from the inverter circuit is connected, and a plurality of feedback paths that connect the output from the inverter circuit to respective inputs of the plurality of latch circuits. The frequency divider further includes a switching circuit that switches connections to the plurality of feedback paths so that an output signal from the inverter circuit is input to only one of the plurality of latch circuits.

Frequency divider and method for controlling the same

A portable device has a configuration such that a plurality of housings are connected functionally, wherein the thickness of a connection section between the housings is reduced so that the portability is improved. The portable device includes a first housing; a first board provided in the first housing; a second housing; a second board provided in the second housing; a connection section for connecting the first housing with the second housing in such a manner that their relative position can be changed; and an optical waveguide film having at least one optical waveguide for connecting the first board with the second board through optical wiring.

Portable device

A first substrate on which an optical-waveguide groove is formed and a second substrate. The second substrate is bonded to the plane of the first substrate on which the optical-waveguide groove is formed by a material having a refractive index higher than those of the first substrate and second substrate. The optical-waveguide groove is filled with the material, and the refractive index of the first substrate is different from the refractive index of the second substrate.

Optical waveguide and method of forming the same

An optical mount substrate and a manufacturing method of the optical mount substrate. An optical fiber guide section for arranging and fixing an optical transfer section, having an optical waveguide or an optical fiber, is formed. An electrical conductivity member is embedded in the optical mount substrate so that it penetrates a first principal plane of an arrangement section for arranging an optical device optically connected with the optical waveguide or the optical fiber on the first principal plane, and a second principal plane of the arrangement section parallel to the first principal plane. The optical fiber guide section and the arrangement section are formed by pressing a mold member to a heated and softened substrate to transfer inversion geometry of the mold member onto the substrate. The electrical conductivity member, having a predetermined shape, is directly pressed onto the heated and softened substrate to embed it into the substrate.

Optical mount substrate, optical module, optical transmitter-receiver, optical transmitter-receiver system, and manufacturing method of optical mount substrate

A wired transmission path includes first and second differential transmission paths. The first differential transmission path is composed of two strip lines, and the second differential transmission path is composed of two strip lines. Each of the strip lines of the first differential transmission path is disposed at an equal distance from the strip lines of the second differential transmission path. Thus, there is provided a wired transmission path including a plurality of differential transmission paths in such a manner so as to cancel crosstalk.

Wired transmission path with plural equidistant differential conductors

Optical module and manufacturing method thereof

An optical module of the present invention includes a first substrate, a second substrate, a PD, a LD, and an optical fiber. The first substratehas a first optical waveguide coreformed therein. The second substratehas a second optical waveguide coreformed therein. The first optical waveguide coreand the second optical waveguide coreform an optical connecting portion where the first substrateand the second substrateare bonded to each other. The LDis capable of transmitting an optical signal via the second optical waveguide coreand the optical fiber. The PDis capable of receiving an optical signal which enters the second optical waveguide corefrom the optical fiber, and propagates through the first optical waveguide corevia the optical connecting portion formed between the first optical waveguide coreand the second optical waveguide core

Optical waveguide, optical module, and method for producing same module

Optical waveguide, optical module, and method for producing the same module

An optical element has a substrate having or not having a channel for optical waveguide; and a material which has a refractive index higher than that of the substrate and is filled in the channel for optical waveguide or is disposed on the substrate; wherein the refractive index in a part of the material varies substantially periodically or is substantially continuously monotone increasing or decreasing in the direction of light propagation.

Growing community of inventors

Daito, Japan

Mikihiro Shimada