Analog,RF and EMC considerations in printed wiring board by Colotti J.

By Colotti J.

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010 in ) R DC = 0 . 3 Ω (0 . 0007 in )(0 . 005 in ) A t w Skin Depth δ = δ = δ = Revision 4 ρ π fµ 0 •Current density drops to 37% (1/e) •Ignore if t<2δ 0 . 0172 µ Ω m = 660 nm = 0 . 03 mils  −7 Ω s  π (10 GHz ) 4π x10  m   0 . 0172 µ Ω m = 21 µ m = 0 . 8 Gbps ♦ 36” trace length 5 FR4 RO4350 Er 4 3 100 1000 2000 10000 Frequency in MHZ Revision 4 Copyright Telephonics 2002-2005 40 Mitigation of Dispersion ♦ More Stable Dielectric - Option for new designs ♦ Pre-Emphasis Filter - Option for new designs or design upgrade ♦ Equalizer - Option for new designs or design upgrade - Maxim MAX3784 (40” length, 6 mil, FR4, 5 Gbps) Revision 4 Copyright Telephonics 2002-2005 41 Coupling ♦ Traces run in close proximity will couple ♦ Coupling is determined by geometry - trace separation, distance to ground(s) & parallel length - peaks at λ/4 and below λ/4 slope is 20 dB/decade 30 L 15 11 Revision 4 30 11 Notes: 1.

0230 1 . 1564 0 . 35 b−t Copyright Telephonics 2002-2005 31 Impedance Examples ♦ Symmetrical Strip-Line ♦ Asymmetrical Strip-Line ♦ Micro-Strip 50 Ω, 11 mils wide (30 mil dielectric) 50 Ω, 9 mils wide (10+20=30 mil dielectric) 50 Ω Micro-Strip, 54 mils wide (30 mil dielectric) Notes: 1. Copper: 1 oz, electro-deposited 2. 503 FR4 dielectric loss exceeds copper loss at 1 GHz Notes: 1. Copper: 1 oz, electrodeposited, 10 mil width, 50 Ohms, strip-line 2. 025, height 28 mils 3. 004, height 22 mils 4.

0007 in )(0 . 005 in ) A t w Skin Depth δ = δ = δ = Revision 4 ρ π fµ 0 •Current density drops to 37% (1/e) •Ignore if t<2δ 0 . 0172 µ Ω m = 660 nm = 0 . 03 mils  −7 Ω s  π (10 GHz ) 4π x10  m   0 . 0172 µ Ω m = 21 µ m = 0 . 8 Gbps ♦ 36” trace length 5 FR4 RO4350 Er 4 3 100 1000 2000 10000 Frequency in MHZ Revision 4 Copyright Telephonics 2002-2005 40 Mitigation of Dispersion ♦ More Stable Dielectric - Option for new designs ♦ Pre-Emphasis Filter - Option for new designs or design upgrade ♦ Equalizer - Option for new designs or design upgrade - Maxim MAX3784 (40” length, 6 mil, FR4, 5 Gbps) Revision 4 Copyright Telephonics 2002-2005 41 Coupling ♦ Traces run in close proximity will couple ♦ Coupling is determined by geometry - trace separation, distance to ground(s) & parallel length - peaks at λ/4 and below λ/4 slope is 20 dB/decade 30 L 15 11 Revision 4 30 11 Notes: 1.

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