SOC Level Mitigations of RFI to WI-FI Bands from GDDR6 Clocks

Abstract

In modern electronics, RFI (Radio Frequency Interference) caused to the WI-FI bands is a major concern because of the degradation in the Wi-Fi throughput performance. In this paper, the RFI caused to the WI-FI 5G band from GDDR6 Clock harmonics is illustrated with an actual design case. At the system level, the conventional RFI mitigation solutions include a metal case EMI Shielding. With the expansion of WI-FI bands, the conventional EMI shields in metal cases are obsoleting at the 5G frequencies and above. Therefore, the SOC level mitigations such as transition time control and duty cycle correction methods are analyzed to reduce the RFI at the source itself, which helps throughput performance in Wi-Fi bands.