| 摘要 |
PROBLEM TO BE SOLVED: To enable a high-speed operation and to suppress a number of used pins from increasing and a circuit scale from expanding by suppressing degradation of waveform quality, power supply bounce, and electromagnetic radiation. SOLUTION: A bus circuit 10 comprises: a transmission line 12; a drive switching circuit 14 composed of PMOS elements of an open drain connected to a transmitting end of the transmission line 12; an terminating resistor 16 one end of which is connected to a receiving end of the transmission path 12; a power supply 22 connected to the other end of the terminating resistor 16 through a connection circuit 20 having inductance components to become a terminal potential; and a receiver element 18 connected to one end of the terminating resistor 16 to receive signals. The bus circuit 10 comprises an alternate switching circuit 24 which is connected to the power supply 22 through the connection circuit 20 to bypass the terminating resistor 16, and is composed of NMOS elements wherein a source is grounded. A gate of the alternate switching circuit 24 is connected to the receiving end of the transmission line 12. COPYRIGHT: (C)2007,JPO&INPIT
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