Speaker
Description
Summary
The characterization of electromagnetic noise emissions of DC-DC converters is a critical issue that has been analyzed during the first stage of the “EMC studies for Tracker upgrade” project (CMS 9.04). Several simulation analyses showed important effects on conducted emissions of DC-DC converters due to port impedance variations. These simulations have been confirmed with several tests on real prototypes of DC-DC. However, the noise level inside the tracker volume will not depend only on the noise emission of each DC-DC converter but also the power distribution network and electronics layout inside each rod. They will play an important role in the noise distribution and this aspect will contribute to decrease the performance of FEE. The power bus that connects all DC-DC converter together, DC-DC converter positions along the rod and grounding topology will have an important effect on noise level inside tracker volume.
For that purpose, a prototype of the Tracker Pt power network has been designed and developed with 4 DC-DC converters and Pt rod structures. Several conducted and radiated tests have been planned and performed to characterize the noise distribution along the rod on a real prototype of the Pt layer power network. Conducted and radiated (near and far field) emission of the power network has been measured. Special attention has been paid on DC-DC converters layout along Pt rod structure and grounding configuration of the rod.
These studies provide important recommendations and criteria to be applied in order to design the power network and electronics layout across the rod. This design plans to present high robustness against EMI noise.
