To suppress mutual interference of high-frequency noise via a power supply-GND pattern at a circuit part of a signal control system by an inexpensive configuration, to suppress noise interference given by high-current noise, generated from a power system circuit, to the signal control system while maintaining the waveform quality of a high-frequency signal, and to prevent an electrical stress from being applied to a circuit due to ground floating caused by disconnection or the like.
A printed wiring board has a pair of a power supply wiring and a GND wiring of a signal control system and a pair of a power supply wiring and a GND wiring of a power system circuit. The GND wiring of the signal control system and that of the power system circuit are not connected to each other in the printed wiring board and respectively composed of an independent wiring pattern or an independent wiring plane. The printed wiring board is configured to connect the GND wiring of the signal control system and that of the power system circuit via a resistor, an inductance element, and diodes, respectively being a limiting element that prevents a low-frequency high current and limits a potential difference between both ends to a prescribed value or below, and a capacitor being at least one capacitative element connected to the limiting element in parallel.
COPYRIGHT: (C)2010,JPO&INPIT
| JP7235775A | ||||
| JP2008130584A | ||||
| JP2008130612A | ||||
| JP10242601A | ||||
| JP2004112892A |
Shiro Takayanagi
Yasuhiro Otsuka
Shuji Kimura
Osamu Shimoyama
Nagakawa Yukimitsu