Patent ID: 8045626

Claim:
A differential transmitter, comprising: a transmitting side signal transmitter outputting differential output signals in accordance with differential input signals which are input; a pair of output terminals outputting the differential output signals from the transmitting side signal transmitter; a pair of transmitting side terminating resistors, each of which being connected in parallel between the transmitting side signal transmitter and the pair of output terminals; and a transmitting side terminating resistor connection controller disconnecting the pair of transmitting side terminating resistors from the transmitting side signal transmitter in an idle state where logic data selected as the differential input signals are input, wherein the transmitting side signal transmitter includes a differential pair formed by a pair of transistors to output the differential output signal, each of the pair of transmitting side terminating resistors is connected to each of drain sides of a pair of transistors forming the differential pair, and the transmitting side terminating resistor connection controller includes a switch circuit and a clamp circuit, the switch circuit disconnecting one of the transmitting side terminating resistors from the transmitting side signal transmitter in the idle state, and the clamp circuit clamping gate voltage of the transistor connected to the other one of the transmitting side terminating resistors so as to turn OFF the transistor.