Application Manual for Power Supply Noise Suppression and Decoupling 26/07/2010 by Murata Manufacturing Co.,Ltd.

More catalogs by Murata Manufacturing Co.,Ltd. | Application Manual for Power Supply Noise Suppression and Decoupling 26/07/2010 | 85 pages | 2018-02-03

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Catalog Application Manual for Power Supply Noise Suppression and Decoupling 26/07/2010

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c39e.pdf 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 7 location of a capacitor for suppressing power supply impedance jul.20,2010 56 7.1 power supply impedance relative to an ic 56 7.2 simple estimation of power supply impedance relative to an ic 57 7.3 possible range for placing the closest capacitor of an ic 58 7.4 guideline for the maximum allowable wiring length lmax 60 8 configuration of pdn combined with capacitors 64 8.1 hierarchical positioning of decoupling capacitors 64 8.2 impedance of pdn 65 8.3 hierarchical positioning of capacitors 66 8.4 target impedance on pcb 69 8.5 bulk capacitor 69 8.6 board capacitor 70 8.7 capacitance design of a capacitor 72 8.8 making a pdn with ultra-low

c39e.pdf 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 jul.20,2010 100 pf 100 0pf 100 00p f 20 db /de c 20db 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

c39e.pdf 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 connecting antenna 6mm jul.20,2010 6mm loop antenna with 13cm diameter 70 60 60 50 40 h 30 v 20 decrease by approx 8db 50 40 h 30 v 200 400 600 800 1000 frequency mhz a without a capacitor 50 40 h 30 v 20 10 0 decrease by approx 18db 60 20 10 70 noise level dbuv/m 70 noise level dbuv/m noise level dbuv/m 20mhz operating frequency 74ac04 10 0 200 400 600 800 1000 frequency mhz b with branched wiring 0 200 400 600 800 1000 frequency mhz 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 described

c39e.pdf 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 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

c39e.pdf 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 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

c39e.pdf 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 capacitor 1µf+2200pf capacitor 1µf only 1608-size mlcc jul.20,2010 capacitor 1µf only 1608-sizemlcc lc filter only capacitor 2200pf only 1608-size mlcc nfe31pt2222200pf 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

c39e.pdf 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 jul.20,2010 power supply voltage voltage fluctuation ∆v ground power supply wiring pdn power supply current current fluctuation ∆i ic pdn digital ic power supply power supply voltage measurement power supply impedance zp power supply terminal 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

c39e.pdf 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 a jul.20,2010 via to ground b 7 ic ground terminal 2 5 12 20 15 7 power supply 0.1Ω power supply terminal 10 3 capacitor 10µf wiring width 5mm c 3mm 2mm 1mm esl=1nh esr=3mΩ 2.2µf esl=1nh esr=10mΩ 0.47µf esl=1nh esr=15mΩ dielectric material thickness 0.8mm dielectric constant 4.5 figure 7-1 modeling diagram of power supply impedance calculation point b only the nearest capacitor is connected entire pdn is connected impedance ohm impedance ohm point a only the nearest capacitor is connected entire pdn is connected frequency mhz frequency mhz a point a b point b impedance ohm point c only the nearest capacitor is

c39e.pdf 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 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 power supply i t 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

c39e.pdf 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 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 lpower 2 zt c bulk ≥ 8-2 when the wiring consists only of printed wiring we can use the following equation below from chapter 7 to estimate lpower lline h 0 .4 l   w  0.6 h × 10 − 6 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

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