Susceptibility evaluation of CAN transceiver circuits with in-place waveform capturing under RF DPI

In-place waveforms at internal nodes of control area network (CAN) transceiver circuits have been evaluated under radio frequency (RF) direct power injection (DPI) immunity test in compliance to IEC TS 62228. The RF power injected into the CAN bus on a printed circuit board (PCB) leads to differential-mode sinusoidal voltage disturbances on the CAN circuits within an integrated circuit (IC) chip. On-chip monitor circuits use the hybrid of low-voltage 5 V CMOS and high-voltage 40 V DMOS channels followed by digitization. The large DPI of 34 dBm causes unexpected glitches on the CAN receiver path and results in the variation of signal delay. This mechanism is explained by in-place waveforms with quarter-ns time resolution.