Prediction of noise reduction effect of ferrite beads on electromagnetic emission from a digital PCB

Abstract

To reduce power supply noise such as power bounce and GAD bounce, ferrite beads are usually inserted between power supply and VCC terminal of an IC by trial and error. Analytical approach on noise reduction effect of ferrite beads has not been established yet, referring to the catalog data on ferrite beads. In this paper, noise reduction effect of ferrite beads on electromagnetic interference (EMI) is analytically k u s s e d . Resonance characteristics of a digital circuit with ferrite beads are calculated and noise reduction effects are predicted in this paper. Nearfield EM1 spectra are predicted and are compared with measured results. With respect to peak level of EM1 spectra, predicted results coincide with measured results within the error of 4 dB.

Effect of Copper Doping on the Structural, Electrical, and Magnetic Properties of Mg-Co Ferrites

“…The effectiveness of ferrite cores in suppressing electromagnetic interference (EMI) in cables and wires, which is analogous to their role in SODAR systems, has been thoroughly investigated [10,11]. Additionally, advancements in the performance of sense-amplifier circuits through pre-amplification strobing and noise-matched clipping further highlight the technological importance of minimizing noise for enhanced signal clarity [12]. The prediction and analysis of the noise reduction effect of ferrite beads on electromagnetic emission from digital PCBs also provides insight into the broader applications of ferrites in EMI suppression [13].…”