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EMC/EMI (Proposed strategies for reducing EMI (controlling impedance of…
EMC/EMI
Why are EMC becoming more important?
A need for low emissions and high immunity to interferences have emerged as key differentiators in IC performance.
Growing risk of interference from EM sources at the high-frequency band
A need to protect trade secrets/ protection against the interception of EM emissions by unauthorised people
What are the main causes of EMC in digital IC circuits?
Synchronous switching noise
inputs/outputs
digital synchronous cores
What are the consequences of EMI in DICs?
counting inaccuracies in micoprocessors
Proposed strategies for reducing EMI
controlling impedance of supply paths
large embedded capacitors from 1-50nF
placing on-chip decoupling on top of VDD and VSS
implementation of distributed voltage regulators close to noisy blocks
Asynchronous design
applying absorbent material directly on the board/package
hardening Ics via specific design techniques like Schmidt triggers
Definitions (IEEE Dictionary)
EMC: The capability of electronic equipment or systems to be operated in the intended operational electromagnetic environment at designed levels of efficiency
EMI: Impairment of a wanted electromagnetic signal by an electromagnetic disturbance.