National Institute of Advanced Industrial Science and Technology

Other

Sharp Kabushiki Kaisha Corporation

Agency of Industrial Science and Technology Ministry of International

Agency of Industrial Science & Technology, Ministry of International Trade & Industry

Evolvable System Research Institute, Inc.

Yuji Kasai

Tetsuya Higuchi

Masahiro Murakawa

Eiichi Takahashi

Taro Itatani

Munehiro Uratani

Shigeki Sakai

Kanji Otsuka

Tamotsu Usami

Toshio Adachi

Hirokazu Nosato

Shogo Kiryu

Shiro Suzuki

Fumihisa Kano

Disclosed is a spectrum spread communication system which is hardly influenced by noises, and in which a frame structure can be identified at a receiving side without use of a frame synchronization signal. A spread code generator switches spread codes ('Scai' and 'Scbi') in each frame, and outputs it to a spread modulation unit. The spread modulation unit performs spread modulation of transmission data, and transmits it to a direct current power line. A reference code generator generates reference codes (&#x201c;Scai&#x201d; and &#x201c;Scbi&#x201d;) in the same code phase. Spread demodulation units performs spread demodulation of the received signal with use of the reference codes (&#x201c;Scai&#x201d; and &#x201c;Scbi&#x201d;), and output it to a selection unit. A frame synchronization detection unit identifies a frame structure on the basis of switching of a synchronization state of a code phase in a code phase synchronization detection unit. The selection unit outputs reception data by selecting spread demodulated data from the spread demodulation unit which is in a phase-synchronized state.

Spectrum spread communication system

A master node () sends an identification signal for designating a communication channel in an identification signal time slot. When the own node matches the node in which the communication channel designated by the identification signal sent from the master node () is set in the identification signal time slot, the master node () and slave nodes (to) each perform data transmission via the communication channel, based on the set contents of the communication channel, in the data transmission time slot corresponding to the identification signal time slot in which the identification signal has been sent.

Serial bus transmission system

A transmitting circuitconverts transmission data to a multilevel analog signal suitable for transmission. The multilevel analog signal is output to a cablevia an amplifier and a hybrid circuit. In the transmitting circuit, a waveform which compensates waveform deterioration at the cableis generated. A reception signal from the cableis input to a mixervia the hybrid circuitand an amplifier. The mixermixes the reception signal and a cancel signal output from a cancel signal generation circuitso as to remove undesired signals. In a receiving circuit, the signal output from the mixeris sampled by use of a plurality of sample-hold circuits, and subjected to analog sum-of-product computation which is performed by a matrix circuit for distortion compensation. Subsequently, the sampled signals are converted to digital signals. The digital signals are collectively subjected to processing such as parallel-serial conversion, whereby reception data and an evaluation signal are obtained. An adjustment control circuitincludes a CPU, and adjusts the respective circuits on the basis of the evaluation signal such that data can be correctly transmitted and received.

Digital data transmitting apparatus

A power consumption controlling apparatus controls power consumption of a high frequency amplifier to reduce the power consumption by adjusting a power supply voltage and a bias voltage of the high frequency amplifier which amplifies a high frequency transmitting signal. The power consumption controlling apparatus includes: a receiving circuit for receiving the high frequency transmitting signal amplified by the high frequency amplifier; an evaluating section for evaluating whether or not a receiving signal obtained from the receiving circuit satisfies a predetermined quality; and an adjusting section for adjusting the power supply voltage and the bias voltage in a range in which the receiving signal evaluated by the evaluating section satisfies the predetermined quality.

Power consumption controlling apparatus for high frequency amplifier

Delay time between an input of data to a circuit block and an output of the data from the data block is measured in accordance with a timing at which the data from the circuit block is acquired by a measurement register and a timing at which the data from the circuit block is acquired by a data latch. An LSI tester sets well voltage adjustment values so that delay time of each circuit block is averaged. From voltages generated by the adjustment voltage generating circuit, a selector selects voltages that are in accordance with the well voltage adjustment values. The voltages selected are applied to a well of a CMOS transistor of each clock timing adjustment circuit. Delay time between timings of inputted clocks is thus adjusted.

Signal timing adjustment device, signal timing adjustment system, signal timing adjustment amount setting program, and storage medium storing the program

A purpose of a high-speed signal transmission system of the present invention is to pass a high-speed digital signal through an outside-chip line exchanging a signal with a high speed LSI chip with a band higher than GHz. The high-speed signal transmission system of the present invention has a configuration of: insertion of a circuit for feeding back received information and adjusting a waveform at a sending side based on genetic algorithm; a device structure for automatically performing pump up and pump down of a transistor carrier; a transmission line of a wiring out of a transistor; and elimination of a common power source of a circuit.

High-speed signal transmission system

A digital circuit according to the present invention includes a pulse delay circuit where a driving current of an inverter is variable, for causing timing of a clock signal to be variable; and the pulse delay circuit has a stabilizing circuit for an amount of a pulse delay by a delay synchronizing loop, and a generating circuit for a pulse delay amount setting voltage with nonlinear characteristics. The present invention makes it possible to realize a timing delay circuit with high resolution, which is not influenced by an operating environment and requires only a small area for the circuit.

Digital circuit having delay circuit for adjustment of clock signal timing

A bus driving device is provided with a driver circuit for driving a bus line thereof. The driver circuit includes an MOS transistor whose well is separated from other circuits. Further, the bus driving device is provided with a voltage control section for adjusting a well voltage, in accordance with a level of a signal in the bus line. With this bus driving device, a threshold voltage of the MOS transistor is set at a predetermined target value.

Bus driver with well voltage control section

An optical apparatus has an adjustment apparatusand an optical unitincluding a plurality of optical elements. The adjustment apparatus sequentially provides control signals that, according to a probabilistic search technique, change the parameters of a stipulated plurality of optical elements among the optical elements to become parameters that cause the functions of the optical apparatus to satisfy stipulated specifications. A method of adjusting the optical apparatus includes sequentially providing control signals that, according to a probabilistic search technique, change the parameters of the stipulated plurality of optical elements among the optical elements, and searching for optical values at which the functions of the optical apparatus the stipulated specification.

Optical apparatus, optical apparatus adjustment method, and storage medium recorded with a processing program that executes said adjustment method

A capacitance position sensor includes a pair of opposed tabular electrodes, an LC oscillator circuit having a toroidal core winding and whose oscillating frequency varies with change in capacitance between the pair of electrodes, and an arithmetic processing unit for calculating an absolute value of a distance between the electrodes from the oscillating frequency of the oscillator circuit. A position controller includes a stationary member formed with one electrode of the pair of electrodes of the position sensor, a movable member on which the other electrode of the pair of electrodes is formed, and moving device for moving the movable member relative to the stationary member.

Capacitance position sensor and position controller equipped with the sensor

The output current value of a direct-current power source obtained by low-frequency, minute modulation of the input voltage of a switching converter is detected in a circuit having an amplification factor switching function that switches the amplification factor between definite magnitudes synchronizing with the modulation, and by using a signal obtained by demodulating in a discriminator circuit the output of this circuit synchronizing with the modulation to control the switching converter, the power point of the switching converter can be tracked to the maximum power point by following the change in state of the direct current power source.

Maximum power point tracking method and device

An optical apparatus has an adjustment apparatus and an optical unit including a plurality of optical elements. The adjustment apparatus sequentially provides control signals that, according to a probabilistic search technique, change the parameters of a stipulated plurality of optical elements among the optical elements to become parameters that cause the functions of the optical apparatus to satisfy stipulated specifications. A method of adjusting the optical apparatus includes sequentially providing control signals that, according to a probabilistic search technique, change the parameters of the stipulated plurality of optical elements among the optical elements, and searching for optical values at which the functions of the optical apparatus the stipulated specification.

In an electronic circuit being provided with a plurality of circuit elements and performing a specified function, a plurality of specific circuit elements related to a circuit performing the specified function out of the plurality of circuit elements are composed of circuit elements changing their element parameters according to values indicated by control signals. The electronic circuit is provided with a plurality of holding circuits for holding a plurality of control signals to be given to the plurality of specific circuit elements. The values of the plurality of control signals which these holding circuits hold are changed by external or internal apparatuses according to a probabilistic searching technique (for example genetic algorithms or simulated annealing algorithms) so that the function of the electronic circuit satisfies designated specifications.

Electronic holding circuit and adjusting method thereof using a probabilistic searching technique

Using an oxide superconductor that does not require cryogenic temperatures, a superconducting tunnel junction device is provided which can accurately control the magnitudes of critical current and step voltage necessary for electronics applications and which has good characteristics as designed. The intrinsic Josephson superconducting tunnel junction device includes an oxide superconductor defined by a general expression (I): Bi Pb Sr Ca R Cu O (n&gE;1, 0<x&lE;0.2, 0&lE;z&lE;1.0, R: rare-earth element).

Intrinsic Josephson superconducting tunnel junction device

A method of measuring a beam flux rate in a film growth apparatus which includes supplying a hollow cathode lamp with a current that alternates between two current values and does not include a zero current, introducing intensity-modulated spectral light emitted by the hollow cathode lamp into a vacuum chamber of a film growth apparatus, absorbing the light by a beam of atoms projected at a substrate surface, and detecting components synchronized with the modulation of the spectral light obtained.

Growing community of inventors

Tsukuba, Japan

Yuji Kasai