| 摘要 |
PROBLEM TO BE SOLVED: To provide a differential signal transmission apparatus capable of reducing spurious radiation caused by differential mode current during transmission of differential signals with a balanced cable. SOLUTION: A resistor R1 is mounted to connect two wiring wires each other arranged on a substrate 11 for connecting between two output terminals of a differential signal driver IC 21 and a twisted-pair cable 2. The differential signal driver IC 21 is a constant current driver, and constant current I1 flows at transmission lines 2a and 2b of the twisted-pair cable 2 by the driver. The constant current I1 shunts so that current I2 flows at the transmission lines 2a and 2b and current I3 flows at the resistor R1. Voltage generated at both ends of the resistor R2 when the current I2 flows is inputted into a differential signal receiver IC 22 as a differential signal. Since the current I2 flowing at the transmission lines 2a and 2b is smaller than the constant current I1, spurious radiation caused by current flowing at the twisted-pair cable 2 is reduced. COPYRIGHT: (C)2005,JPO&NCIPI
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