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This paper presents the physical layer design comprising the Bus Guardian (BG) and Bus Driver (BD) used in an in-vehicle network compliant with FlexRay standards. FlexRay is a new standard for data/signal communication among electronic devices installed in a vehicle. The Bus Guardian is one of the most important components in charge of security and safety for the FlexRay standards. The Bus Guardian proposed in this work is implemented by hardware description language (HDL) and co-verified with our prior FlexRay transceiver using a typical 0.18 um mixed-signal CMOS process.