Influence of RF noise on automotive TFT power distribution network on radiated emissions

With increasing consumer's demand and technological advancement for automotive electronic systems, it is becoming a challenge to ensure good compliance for high speed design (signal and power integrity) and electromagnetic compatibility. In this paper, the effects of high frequency switching noise from an automotive cluster coupling into a TFT display module, causing undesirable radiated emissions is presented. Experimental results, demonstrating the importance of good power supply filtering to prevent RF noise from coupling into the TFT display from an automotive instrumentation cluster is demonstrated. In addition, complex modeling of the entire power distribution network, consisting of PCB and FPC is performed. With the model, the PDN impedance with and without EMC considerations can be simulated and analyzed.