摘要:
A multilayer printed circuit board (PCB) includes a substrate; a ground layer having edges which define a gap portion, the ground layer being provided on a bottom face of the substrate; and at least two signal traces and provided on a top face of the substrate so as to straddle the gap portion and so as to be substantially parallel to each other. The multilayer PCB also includes at least one ground trace provided between the at least two signal traces and on the top face of the substrate so as to straddle the gap portion.
摘要:
A CAD apparatus includes a determining unit for determining a component order in ascending order of impedance of components for passive components amongst components to be placed on a printed wiring board. The CAD apparatus places each passive component in the determined component order in a vicinity of power pins of non-passive components that are already placed.
摘要:
The present invention provides a switching circuit and an electronic switching component having a switching semiconductor device to perform switching between a conducting state and a non-conducting state of a conducting path to thereby reduce the power loss thereof and a control method thereof. In the present invention, at least two FETs 11 and 12, wherein the FET 11 has a faster switching time and the FET 12 has a lower ON resistance. Active terminals (drains and sources) of the FETs 11 and 12 are connected to each other in parallel. By employing these FETs 11 and 12, the conversion between an ON-state and an OFF-state of the conducting path is performed. In converting from the non-conducting state to the conducting state, the control circuit 13 first turns on the FET 11 and then turns on the FET 12 when if a voltage between terminals of the FET 11 reaches around a saturation value thereof. In converting from the conducting state to the non-conducting state, the control circuit 13 first turns off the FET 12 and then turns off the FET 11 when if a voltage between terminals of the FET 11 reaches around a saturation value thereof.
摘要:
In the case of handling an independent document, a transmission switch is set at "L" position and the document is transmitted and read out at a high speed, and the document is discharged to the front side of the image reading apparatus. In the case of handling a continuous document, the transmission switch is set at "H" position, and the document is transmitted at a low speed subjected to the processing capacity of an image processor, and the document is read out before being discharged to a rear face of the apparatus. At this time, when the document arrives at a given location in the apparatus, a table apparatus lowers the table and prevents the continuous documents from being damaged.
摘要:
The on/off statuses of relays corresponding to information played back from an optical disk, for example, position information such as absolute time and track number, are stored in memory. When the absolute time or track number in the sub-code information decoded by the sub-code decode circuit is identical to the absolute time or track number stored in memory, the relays in the external device interface unit are switched to control the external devices connected to them. With this arrangement, external devices such as lights, slide projector, and illumination may easily be controlled in synchronization with optical disk playback information.
摘要:
An IC current measuring apparatus is provided between an IC and a substrate. The IC current measuring apparatus electrically connects each of a plurality of IC-facing terminals and a different one of a plurality of substrate-facing terminals. Especially, resistances are each inserted into a path between an IC terminal targeted for measurement and a substrate terminal corresponding thereto. Furthermore, the IC current measuring apparatus is provided with terminals each used to measure a voltage between both ends of an inserted resistance corresponding thereto. Accordingly, a measurer who measures current flowing through an IC-facing terminal can measure the current flowing through the IC-facing terminal by providing the IC current measuring apparatus between the IC targeted for measurement and the substrate and measuring a voltage between both ends of an inserted resistance corresponding to the IC terminal through which current he/she wishes to measure flows.
摘要:
Provided is a contactless communication system in which each device performing communication in the system includes a dipole antenna having a length which is less than half of wavelength of a clock frequency of digital baseband signals which are communicated. The dipole antennas are disposed in opposing positions to one another. The contactless communication system performs short distance contactless communication of the digital baseband signals using a frequency band which does not include a resonant frequency of the dipole antennas.
摘要:
A detection signal transmitting unit 123 of a first component 110 transmits a plurality of detection signals having different frequency spectrums to a second component 210. Upon receiving the detection signals, a detection signal returning unit 233 of the second component 210 returns, as return signals, respective signal waveforms of the received detection signals to the first component 110. A detection signal judging unit 126 of the first component 110 judges authenticity of the received return signals based on the transmitted detection signals. When the judging unit judges that the received return signals are not authentic, a tamper-resistance control unit 127 adds a restriction to the communication performed between the first component 110 and the second component 210.
摘要:
One array antenna including three induction coils is formed on an application integrated circuit of a fixed housing. Eight array antennas, each of which is arranged in a manner similar to that of the array antennas of the application integrated circuit, are formed at intervals of 45 degrees around a rotation axis on an imaging process integrated circuit of a movable housing. A controller selects one of the eight array antennas of the imaging process integrated circuit so that a magnitude of a difference between a rotation angle of a movable housing and a rotation angle of the movable housing becomes equal to or smaller than 22.5 degrees based on the rotation angle of the movable housing, and controls a stepping motor so that a selected array antenna opposes to the array antenna on the application integrated circuit.