Limits of Conducted EMI

Here we take up the concepts of common mode and differential mode noise. Also, regulatory conducted emission limits and related measuring techniques are discussed. 

---

The effects of chemical structure on polymer film properties and applications were reviewed. The uses of conductive polymers in the bioanalytical sciences and in biosensor applications were investigated. Synthesis, characterization, and applications of CPs were reported, and the main aspects of CPs in chemical sensors and biosensors were covered. The advantages and limitations of conductive polymers for different biomedical applications like tissue engineering, biosensors, drug delivery, and bioactuators were reported. Different preparation methods for conductive polymers and the use of conductive pol5miers for electromagnetic interference (EMI) shielding applications were reviewed. ... 

Note This technique does nothing to cancel the noise injected through the interface capacitance (i.e. between the primary to secondary windings). But despite that limitation, a 10 dBpV reduction in conducted EMI is still possible (at various points in the EMI spectrum). So this could certainly be worth trying out, if there is a last-minute problem and a major redesign of the board needs to be avoided. 

Numerous works have been carried out in the application of conductive polymers to EMI shielding [27] but the limitation of intrinsic conductivity for non-metallic conductive polymers, compared to metals,... 

ICP have been limited in EMI application because of the conductivity. Though, they are 6-8 orders of magnitude lower than other polymers. Combining this with conventional fdler should shift the conductivity vs. volume percent down and to the left, giving higher conductivities at lower volume loadings. 

---