Patent ID: 7633312

Claim:
A data transmission apparatus comprising: a transmitting unit; a transmission line connected with said transmitting unit and comprising a first transmission line and a second transmission line; a receiving unit connected with said transmission line; and a terminating resistance connected between a first reception node connected with said first transmission line on a receiving unit side and a second reception node connected with said second transmission line on a receiving unit side, wherein said transmitting unit transmits a transmission data to said receiving unit through said transmission line, and said receiving unit detects a reception data corresponding to said transmission data based on an amplitude voltage as a voltage difference between said first reception node and said second reception node; wherein said amplitude voltage is independent of an impedance of a component of said transmitting unit, wherein said transmitting unit comprises: a first switch connected between said first transmission line and a ground terminal; and a second switch connected between said second transmission line and said ground terminal, said transmission apparatus exclusively turns on one of said first switch and said second switch in response to said transmission data, and an electric current flows from said receiving unit to the turned-on switch through said transmission line, wherein said receiving unit comprises: a receiver circuit configured to supply a first electric current to said first reception node and a second electric current to said second reception node, to detect said reception data in response to said amplitude voltage, and to output the detected reception data, wherein said receiver circuit comprises: a constant current source configured to supply a first constant current to said first reception node and a second constant current to said second reception node; and a data detecting circuit configured to supply a first sub-electric current to said first reception node and a second sub-electric current to said second reception node, and to generate said reception data in response to said amplitude voltage, and said first electric current is a summation of said first constant current and said first sub-electric current and said second electric current is a summation of said second constant current and said second sub-electric current; wherein said data detecting circuit supplies said first sub-electric current to said first reception node depending on said second constant current and said second sub-electric current to said second reception node depending on said first constant current, and outputs said reception data corresponding to said transmission data in response to said amplitude voltage.