 This paper investigates the impact of spread-spectrum modulation, SSM, on power line communications, PLC. SSM is commonly used to reduce electromagnetic interference, EMI, but it can also cause issues with other components in the same circuit. The paper looks at the effectiveness of different types of SSM in reducing EMI, and how they affect the performance of a CC-based DC-DC converter. The paper concludes that SSM has the potential to reduce EMI, but it should be carefully selected depending on the application. This article was authored by Sada Uston-Urkin, Angel PenaQuintal, and Dave Thomas.