摘要:
In a radio communication system having a plurality of antennas, a reception-system circuit including variable gain amplification circuits for amplifying a signal received from either of the antennas and a frequency conversion circuit for down-converting the received signal to a signal of a lower frequency, and a signal measuring circuit for detecting intensity of the received signal, whereby a signal received by either of the antennas is selected in accordance with a reception state and amplified and demodulated, change rates with time of a signal which is formed by the signal measuring circuit are determined in respect of either of the signals received by the plurality of antennas and a control signal for selecting a reception antenna is generated in accordance with a differences between the change rates.
摘要:
A wireless LAN system has auto gain control with no work load applied to its baseband processing block. When the wireless LAN system gets ready to receive a signal, the gain control circuit switches between the receiving antennas. The gain control circuit sets gain setting value time divisional data according to the level of a received signal to roughly control the gain to be set in the LAN and the gain to be set in two programmable gain amplifiers.
摘要:
The invention comprises: processing for receiving an OFDM packet having a preamble and the following data transmission symbol, in which packet the subcarrier interval of the preamble is set wider than that of the data transmission symbol; processing for estimating a DC offset occurring at a receiving side by using the received preamble; processing for correcting the DC offset on the received data transmission symbol, according to the estimation result of the DC offset; and processing for demodulating the DC offset corrected data transmission symbol. Thus, it is possible to estimate a DC offset and then correct the DC offset according to the estimated value, in the OFDM packet with no nul symbol defined there.
摘要:
A brake disc for a railway vehicle, including a ring-shaped plate portion with a front side serving as a frictional surface and a plurality of fins being projected and disposed radially on the back side of the plate portion, the plate portion being fixed to a wheel, wherein a rib is provided between fins adjacent to each other, and a slit developing in the direction from a wheel-side face of the rib toward the back side of the plate portion is disposed in a circumferentially intermediate portion of the rib, thereby making it possible to suppress the deformation caused by frictional heat.
摘要:
A production method of a seamless pipe or tube according to the present invention comprises the steps of applying a lubricant containing carbon to a mandrel bar, producing a material pipe or tube with a mandrel mill using the mandrel bar to which the lubricant is applied, and reheating the material pipe or tube in a reheating furnace, wherein when a temperature of the material pipe or tube is 550° C. or higher and 1000° C. or lower in the reheating step, an oxidizing gas is fed into the material pipe or tube.
摘要:
Disclosed is a vacuum processing apparatus in which a conducive partition having a plurality of through holes is formed inside a vacuum processing vessel, and an internal space of the vacuum processing vessel is partitioned into a plasma generating space in which a high-frequency electrode is installed to function as a counter electrode with respect to the partition, and a substrate processing space in which a substrate is set. This vacuum processing apparatus includes a gas reservoir formed on a sidewall of the vacuum processing vessel and communicating with the plasma generating space, and a gas supply system connected to the gas reservoir to supply a gas to the gas reservoir.
摘要:
In a plasma CVD apparatus, a plate formed with a plurality of perforated holes is arranged to separate a plasma generation region and a processing region. The aperture ratio of the perforated holes to the plate is not greater than five percent. Plasma including radicals and excited species is generated from an oxygen (O2) gas in the plasma generation region, then the radicals and excited species flow into the processing region through the perforated holes. A monosilane (SiH4) gas is also supplied into the processing region, but the backward flow of the monosilane gas into the plasma generation region is suppressed by the plate. In the processing region, the radicals and the excited species and the monosilane gas result in a gas phase reaction that yields the silicon dioxide film formed on the substrate or the wafer with high quality.
摘要:
A method for thin film formation that can form, at a low temperature, a good thin film having a good interfacial property between a silicon substrate and a silicon oxide film and having a low interfacial trap density is provided.The method for thin film formation comprises generating plasma within a vacuum vessel to generate an active species (radical) and forming a silicon oxide film on a silicon substrate using this active species and a material gas, wherein, in addition to the material gas, a nitrogen atom-containing gas is introduced into the vacuum vessel in its film forming space where the active species (radical) and the material gas come into contact with each other for the first time and are reacted with each other to form a silicon film on the silicon substrate, and wherein the flow rate of the nitrogen atom-containing gas during the formation of the silicon oxide film on the silicon substrate is regulated so as to be the maximum value at least at the time of the start of formation of the silicon film on the silicon substrate.
摘要:
Disclosed herein is an encryption and decryption communication semiconductor device comprising at least, a communication interface for performing a transfer of data according to a predetermined communication system, one or two or more encryption/decryption circuits which encrypt or decrypt input data in accordance with a predetermined algorithm, and a plurality of external interfaces for performing the input/output of data from and to external devices. The communication interface, the encryption/decryption circuits and the plurality of external interfaces are formed on one semiconductor chip. In the cryption and decryption communication semiconductor device, input data sent from any one of the plurality of external interfaces is encrypted or decrypted by at least one of the encryption/decryption circuits and is capable of being outputted to any different one of the plurality of external interfaces.
摘要:
In a plasma CVD apparatus, a plate formed with a plurality of perforated holes is arranged to separate a plasma generation region and a processing region. The aperture ratio of the perforated holes to the plate is not greater than five percent. Plasma including radicals and excited species is generated from an oxygen (O2) gas in the plasma generation region, then the radicals and excited species flow into the processing region through the perforated holes. A monosilane (SiH4) gas is also supplied into the processing region, but the backward flow of the monosilane gas into the plasma generation region is suppressed by the plate. In the processing region, the radicals and the excited species and the monosilane gas result in a gas phase reaction that yields the silicon dioxide film formed on the substrate or the wafer with high quality.
摘要翻译:在等离子体CVD装置中,形成有多个穿孔的板被布置成分离等离子体产生区域和处理区域。 穿孔孔与孔板的孔径比不大于百分之五。 等离子体产生区域中的氧(O 2 O 2)气体产生包括自由基和激发物质的等离子体,然后自由基和激发物质通过穿孔穿过处理区域。 也可以在处理区域中供给单硅烷(SiH 4 S)气体,但通过该板抑制甲硅烷气体向等离子体产生区域的逆流。 在处理区域中,自由基和被激发的物质和单硅烷气体导致气相反应,其产生在基板或晶片上形成的高质量的二氧化硅膜。