Controller Area Network With Flexible Data Rate Transmitter Design With Low Electromagnetic Emission

Controller area network with flexible data rate (CANFD) has been introduced to support higher data rates for intelligent automotive systems. To achieve a robustness in the electronic functions of electronic systems, CAN-FD transmitters should provide a good symmetry between the differential signaling on the CAN bus radiating a low electromagnetic emission (EME). This paper proposes a new CAN-FD transmitter which achieves good symmetry on the CAN-FD signals. Also, a so-called “Ping-Pong” driving scheme is introduced. Without using complex circuits and after-calibration process, this method can match accurate turn ON/OFF timing of the transmitter signals. The proposed CAN-FD transmitter was fabricated using a 0.18 μm automotive Bipolar-CMOS-DMOS process. The measurement results show that the proposed CAN-FD transmitter improves the voltage symmetry of the CAN bus at 5 Mbps, achieving a low EME.