Application Manual for Power Supply Noise Suppression and Decoupling by Murata Manufacturing Co.,Ltd.

More catalogs by Murata Manufacturing Co.,Ltd. | Application Manual for Power Supply Noise Suppression and Decoupling | 85 pages | 2013-07-30

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Catalog Application Manual for Power Supply Noise Suppression and Decoupling

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Featured catalog pages of Application Manual for Power Supply Noise Suppression and Decoupling

note · please read rating and caution for storage operating rating soldering mounting and handling in this catalog to prevent smoking and/or burning etc · this catalog has only typical specifications therefore please approve our product specifications or transact the approval sheet for product specifications before ordering c39e.pdf jul.20,2010 7 location of a capacitor for suppressing power supply impedance 7.1 power supply impedance relative to an ic 7.2 simple estimation of power supply impedance relative to an ic 7.3 possible range for placing the closest capacitor of an ic 7.4 guideline for the maximum allowable wiring length lmax 8 configuration of pdn combined with capacitors 8.1 hierarchical positioning of decoupling capacitors 8.2 impedance of pdn 8.3 hierarchical positioning of capacitors 8.4 target impedance on pcb 8.5 bulk capacitor 8.6 board capacitor 8.7 capacitance design of a capacitor 8.8 making a pdn with ultra-low impedance 9 summary references 56 56 57 58 60 64

note · please read rating and caution for storage operating rating soldering mounting and handling in this catalog to prevent smoking and/or burning etc · this catalog has only typical specifications therefore please approve our product specifications or transact the approval sheet for product specifications before ordering c39e.pdf jul.20,2010 100 pf 100 0pf 100 00p f 20db 20 db /de c 100 000 pf figure 2-7 insertion loss characteristics of capacitor theoretical values the actual characteristics of the capacitor s insertion loss are as indicated in figure 2-8 in the high frequency range over 10mhz insertion loss decreases as frequency increases this is considered to be due to the fact that insertion loss is limited by a minute inductance component esl and resistance component esr contained in the capacitor as described later this indicates that in order to form a decoupling circuit with excellent noise suppression performance at high frequency we must use a capacitor with small esl

note · please read rating and caution for storage operating rating soldering mounting and handling in this catalog to prevent smoking and/or burning etc · this catalog has only typical specifications therefore please approve our product specifications or transact the approval sheet for product specifications before ordering c39e.pdf jul.20,2010 6mm connecting antenna loop antenna with 13cm diameter 6mm 20mhz operating frequency 74ac04 70 60 50 40 h 30 v 70 60 50 40 decrease by approx 8db 70 60 50 40 decrease by approx 18db h 30 v 30 hveuv vdblsn io m e uv vdblsn io m 20 10 0 200 400 h mfre uny q c z 600 800 1000 20 10 0 200 400 h mfre uny q c z 600 800 1000 e uv vdblsn io m 20 10 0 200 400 mh f r qc eynu z 600 0 8 0 1000 a without a capacitor b with branched wiring c without branched wiring figure 3-9 confirming ic power supply noise suppression effect noise radiation spectrum 3.4 influence of peripheral circuit impedance insertion loss characteristics for the capacitor

note · please read rating and caution for storage operating rating soldering mounting and handling in this catalog to prevent smoking and/or burning etc · this catalog has only typical specifications therefore please approve our product specifications or transact the approval sheet for product specifications before ordering c39e.pdf jul.20,2010 electrodes where neighboring electrodes have reversed polarities are indicated as shown in the internal structure diagrams in figure 4-3 b and c internal electrodes are formed thick and short and additionally internal electrode drawers are formed so that they can be connected to external electrode alternately their external appearances seem similar to capacitor arrays but these components internal electrode configuration is totally different by choosing such a structure mutual inductance occurs between currents where they flow in opposite directions cancelling each other s inductance as shown in figure 4-4 for the components where currents

note · please read rating and caution for storage operating rating soldering mounting and handling in this catalog to prevent smoking and/or burning etc · this catalog has only typical specifications therefore please approve our product specifications or transact the approval sheet for product specifications before ordering c39e.pdf jul.20,2010 5 inductors and lc filters when a decoupling capacitor is not sufficient to suppress power supply noise the combined use of inductors and lc filters is effective in this chapter we will introduce inductors and lc filters suitable for controlling power supply noise choke coils and ferrite beads are the common inductors used for power supply decoupling circuits while ferrite beads are used to control a wide range of frequencies that are relatively high frequency choke coils tend to be used to control specific frequencies although ferrite beads are used more for the noise measures described by this manual choke coils are also for noise control

note · please read rating and caution for storage operating rating soldering mounting and handling in this catalog to prevent smoking and/or burning etc · this catalog has only typical specifications therefore please approve our product specifications or transact the approval sheet for product specifications before ordering c39e.pdf jul.20,2010 capacitor 1µf+2200pf capacitor 1µf only 1608-size mlcc lc filter only nfe31pt2222200pf capacitor 1µf only 1608-sizemlcc capacitor 2200pf only 1608-size mlcc capacitor 1µf+lc filter a when combining two capacitors b when combining a capacitor and a lc filter figure 5-16 frequency characteristics of a power supply filter calculated values figure 5-15 shows a component with a combination between a feed-through capacitor and a ferrite bead with excellent high-frequency characteristics assuming its use with a large capacitance capacitor input and output electrodes on both ends are connected with a metal molded terminal making the serial

note · please read rating and caution for storage operating rating soldering mounting and handling in this catalog to prevent smoking and/or burning etc · this catalog has only typical specifications therefore please approve our product specifications or transact the approval sheet for product specifications before ordering c39e.pdf jul.20,2010 power supply voltage voltage fluctuation v ground power supply wiring pdn ic pdn power supply voltage measurement digital ic power supply power supply impedance zp power supply terminal power supply current current fluctuation i figure 6-2 measurement position of voltage fluctuation an example of voltage waveform when power supply voltage fluctuates is shown in figure 6-3 in this case it is understood that the power supply impedance is resistivity without frequency characteristics figure 6-3 a shows a case where the current simply varies stepwise and figure 6-3 b fluctuates in a slightly more complex pattern in either case voltage fluctuation

note · please read rating and caution for storage operating rating soldering mounting and handling in this catalog to prevent smoking and/or burning etc · this catalog has only typical specifications therefore please approve our product specifications or transact the approval sheet for product specifications before ordering c39e.pdf jul.20,2010 a b 7 12 20 15 2 5 7 10 3 via to ground ic ground terminal power supply terminal power supply 0.1 wiring width 5mm capacitor 10µf esl=1nh esr=3m c 3mm 2mm 1mm 2.2µf esl=1nh esr=10m 0.47µf esl=1nh esr=15m dielectric material thickness 0.8mm dielectric constant 4.5 figure 7-1 modeling diagram of power supply impedance calculation point a impedance ohm only the nearest capacitor is connected entire pdn is connected point b impedance ohm only the nearest capacitor is connected entire pdn is connected frequency mhz frequency mhz a point a point c impedance ohm only the nearest capacitor is connected entire pdn is connected b point b frequency

note · please read rating and caution for storage operating rating soldering mounting and handling in this catalog to prevent smoking and/or burning etc · this catalog has only typical specifications therefore please approve our product specifications or transact the approval sheet for product specifications before ordering c39e.pdf jul.20,2010 pcb package delayed response cable etc board wiring etc socket bga board wiring etc wire bonding internal wiring for semiconductor package wiring etc current fluctuation semiconductor i t power supply bulk capacitor board capacitor package capacitor on-chip capacitance figure 8-2 current supply model from capacitors as described in chapter 7 we need to consider wiring inductance in addition to capacitors for power supply impedance relative to the ic in figure 8-2 the influence of the wiring between the semiconductor and each of the capacitors is expressed in terms of inductance for the purpose of simplicity capacitance and resistance of the

note · please read rating and caution for storage operating rating soldering mounting and handling in this catalog to prevent smoking and/or burning etc · this catalog has only typical specifications therefore please approve our product specifications or transact the approval sheet for product specifications before ordering c39e.pdf jul.20,2010 impedance at the bulk capacitor mounting position when the power supply module is operating ideally we will let this inductance be lpower and establish the bulk capacitor capacitance cbulk as shown in chapter 2 c bulk lpower 2 zt 8-2 when the wiring consists only of printed wiring we can use the following equation below from chapter 7 to estimate lpower 0.6 lline h 0 .4 l w × 10 6 h 7-3 in this equation h is the thickness of dielectric material in msl w is the wiring width and l is the wiring length in a case where the response characteristics of the power supply module itself are not negligible this inductance lpowerresponce must be

note · please read rating and caution for storage operating rating soldering mounting and handling in this catalog to prevent smoking and/or burning etc · this catalog has only typical specifications therefore please approve our product specifications or transact the approval sheet for product specifications before ordering c39e.pdf