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Use of Embedded Passives for Enhanced Performance and Integration: Case Studies
Keywords: Embedded, Capacitors, Integration
A number of papers have been published regarding development of materials for embedded capacitors and the advantages of incorporating embedded capacitors in PWBs. There are not, however, many details as to the number of discrete capacitors that can be removed by utilizing this technology, this will be addressed in this paper. Two types of Power/Ground simulation tools are utilized to compare the impedance and resonances of the standard design with one using embedded capacitor materials of various DK and thickness. We found good correlation of the simulated to actual performance. Furthermore we observed the effect that thin capacitor substrates have as power/ground planes. The voltages were more stable with greatly reduced resonances. We will show that by using thin core planes and simulation tools one can reduce the number of discrete capacitors and get better electrical performance. The actual number and type(size) of capacitors removed will be presented. In addition to discrete capacitor reduction, the amount of electro-magnetic radiation from the board (which can cause EMI issues) will be shown to be reduced by utilizing the embedded capacitor planes. This is attributed to the reduction in power/ground plane resonance (as shown by the simulations). As other applications are being looked at for incorporating embedded capacitors(such as the modules used in cell phones and laptop PCs) the ability to predict the number of discrete components that can be removed is critical to the decision to use the technology. In this paper, we will show the approach of using electrical performance simulation of boards with and without embedded capacitors. The number of discrete components the model predicts, to those we can actually remove in actual boards will also be compared. With a good predictive model, the decision to utilize embedded capacitors is simplified.
John Andresakis, VP of Strategic TEchnology
Oak-Mitsui Technologies
Hoosick Falls, NY

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