Common mode noise reduction circuit, differential signal transmitting apparatus, differential signal transmitting system and car electronics device

摘要

A common mode noise reduction circuit works with a transmission signal output circuit that has a first and a second output terminals and transmits differential signals from the first and second output terminals. The common mode noise reduction circuit includes: a first generating circuit to generate electric current to input to or receive electric current from the first output terminal; a second generating circuit to generate electric current to input to or output receive electric current from the second output terminal; and a control circuit to control the first and second generating circuits so that in synchronism with a drive control clock of the transmission signal output circuit, the first and second generating circuits generate current pulses to reduce common mode noise of the differential signals to be transmitted.