Controller Area Network With Flexible Data Rate Transmitter Design With Low Electromagnetic Emission
Sukhwan Kang, Jewoo Seong, Myunghee Lee · IEEE Transactions on Vehicular Technology · 2018
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.