Patent ID: 6937111

Claim:
A transceiver for transmitting and receiving signals via a transmission line, comprising: a receiver for receiving input signals via the transmission line; an active termination circuit for being selectively connected to the transmission line parallel with the receiver according to a receiving condition; a self-terminated driver circuit for outputting a first voltage and a second voltage according to output data; and a selective circuit for selectively connecting the self-terminated driver circuit to the transmission line when output of the self-terminated driver circuit is the first voltage, and for selectively connecting the self-terminated driver circuit or the active termination circuit to the transmission line when the output is the second voltage, wherein input impedance combining the receiver with the active termination circuit and output impedance of the self-terminated driver circuit are matched or approximately matched to characteristic impedance of the transmission line, wherein the self-terminated driver circuit shares a common structure portion with the active termination circuit, and wherein the common structure portion is connected to the transmission line regardless of operation of the selective circuit.