  This critical analysis offers a comprehensive overview of the efficiency and
noise reduction methodologies applied in switch mode power supplies (SMPSs) and
the emerging trends in the field. The study acknowledges that power supplies
are an essential element in most electronic devices, and the recent
developments have placed a greater emphasis on precision, miniaturization, and
effectiveness of these components. The research focuses on SMPSs in comparison
with other power supply methodologies and investigates the identification and
mitigation of internal and external noise in DC Buck converter design through
simulations. The study explores the latest and established technologies
employed in improving SMPSs' power supply units and achieving maximum
performance. The paper highlights the use of a Linear Impedance Stabilization
Network (LISN) topology and filter topologies to stabilize and eliminate noises
in non-ideal scenarios, starting from an ideal buck converter. The research
also emphasizes the design, analysis, and implementation of energy-efficient
switch mode isolated converters commonly used in everyday life. Therefore, the
study concludes that the integration of the LISN methodology in SMPSs design
can play a crucial role in achieving maximum performance and efficiency.
