Stackup Planning Pt1 PCBD-June2015 - iCD

38 4HE 0#" $ESIGN -AGAZINE s $ECEMBER In my first column on power distribution network (PDN) Planning , Beyond Design: Pow-er Distribution Network Planning , I described the basics of Planning for low AC impedance between the planes, in order to reduce supply noise and provide reliable performance. I rec-ommend that you read that column first to get the required background column will focus on capacitor selec-tion and three alternative approaches to ana-lyzing the PDN:1. Target frequency 2. One value capacitor per decade3. Optimized value capacitorTraditionally, the target frequency approach has been used. This method targets a precise frequency and is used to reduce AC impedance and can also be used to reduce EMI within a specific band. The alternatives of using either one value capacitor per decade or many opti-mized capacitors , is an attempt to level out the AC impedance, at the desired impedance, over a broad frequency latest high-performance processors, with sub-nanosecond switching times, use low DC voltages with high transient currents and high clock frequencies to minimize the power consumption and hence, heat dissipated.

฀฀฀฀฀฀฀฀฀฀41 PDN PLANNING AND CAPACITOR SELECTION, PART 1 continues beyond design also applications where the bulk capacitance re-quirements are so high that the volumetric ef-

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