Bus driver IC for use in vehicle multiplexing communications

A prototype of a bus driver IC for use in communications, and particularly suited in multiplexed bus operation in an automotive vehicle environment, has been developed. The bus driver consists of amplitude and time matched complementary current sources which minimize bus radio frequency radiation. Bus driving system analysis is presented, together with details of the bus driver IC design. The reduction of the level of radiated radio noise was examined from two approaches: from restraining abrupt transitions in the bus voltage and current, and from using amplitude and time matched complementary signals. The current control type driver had better characteristics in restraining the abrupt transition of the bus voltage and current than the voltage control type