EMI Filter Design, 3rd Edition

18Network Analysis of Passive LC Structures

This chapter presents frequency-domain analysis of EMI LC filter structures in terms of network impedances, transfer functions, stability, and insertion loss. This chapter is also a prerequisite for chapter 19, which provides discussion on EMI filter design process and presents formal EMI filter design methods using various analysis techniques.

18.1 Lossless Networks

In almost all cases, EMI filters are made up from one or more LC structures and should include carefully placed damping dQ networks to reduce the circuit Q for each complex pole pair. Lossless networks are those that are constructed of purely reactive elements, so that no losses are incurred in the network itself. In reality, these reactive ...