Thin Laminate Electrical Benefits Inductance (L) is proportional to - PowerPoint PPT Presentation

Thin Laminate Electrical Benefits • Inductance (L) is proportional to thickness (t) • dV=L*dI/dt: SSN is less if L is lower • Plane resonances are suppressed if t<0.3 mils • Low-pass noise propagation if t<1um • Radiation is less from thinner laminates • Dielectric constant increases static capacitance, but L is unchanged Istvan Novak, Valerie St. Cyr Thin laminate TecForum 1 DesignCon, 1/28/02

Resonance-Free Planes for t<0.3mils Magnitude of self impedance at center [ohm] 10”x10” planes 1.0E+02 Bare board Simulated, t= • 10-mil 1.0E+01 • 5-mil • 2-mil 1.0E+00 • 1-mil • 0.5-mil 1.0E-01 • 0.2-mil • 0.1-mil • 0.05-mil 1.0E-02 • 0.02-mil • 0.01-mil 1.0E-03 1.E+05 1.E+06 1.E+07 1.E+08 1.E+09 Istvan Novak, Valerie St. Cyr Thin laminate TecForum 2 DesignCon, 1/28/02

Low-pass Transfer for t<1um Magnitude of transfer impedance corner-to-center [ohm] 10”x10” planes 1.0E+02 Bare board Simulated, t= 1.0E+01 • 10-mil 1.0E+00 • 5-mil • 2-mil 1.0E-01 • 1-mil 1.0E-02 • 0.5-mil • 0.2-mil 1.0E-03 • 0.1-mil 1.0E-04 • 0.05-mil (1.2um) • 0.02-mil 1.0E-05 • 0.01-mil 1.0E-06 1.E+05 1.E+06 1.E+07 1.E+08 1.E+09 Istvan Novak, Valerie St. Cyr Thin laminate TecForum 3 DesignCon, 1/28/02

10”x5” Test Board J603 J603 J501 J501 Istvan Novak, Valerie St. Cyr Thin laminate TecForum 4 DesignCon, 1/28/02

Measured Self Impedance Impedance magnitude [ohm] 1.00E+01 2 mil 1.00E+00 1 mil 1.00E-01 0.3 mil 1.00E-02 Bare Frequency [Hz] 1.00E-03 board 1.00E+06 1.00E+07 1.00E+08 1.00E+09 Istvan Novak, Valerie St. Cyr Thin laminate TecForum 5 DesignCon, 1/28/02

Measured Close-Field Radiation Relative radiation field [dB] -4.E+01 2 mil 1 mil -6.E+01 0.3 mil -8.E+01 -1.E+02 Bare Frequency [Hz] -1.E+02 board 1.00E+06 1.00E+07 1.00E+08 1.00E+09 Istvan Novak, Valerie St. Cyr Thin laminate TecForum 6 DesignCon, 1/28/02

Impedance on Small Board Geometry Paralleled plane pairs Bare board 1 Same construction, with • Aromat 2-mil FR4 BC2000 • DuPont 1-mil HiK 2 • Aromat 1-mil FR4 • 3M 0.3-mil C-Ply 4” 6” Istvan Novak, Valerie St. Cyr Thin laminate TecForum 7 DesignCon, 1/28/02

Impedance on Small Board Self-impedance at (1) Impedance magnitude [ohm] ZBC2000 1.6E-01 Dup-HikI 1.4E-01 1-mil FR4 1.2E-01 C-Ply 1.0E-01 8.0E-02 Impedance magnitude [ohm] 6.0E-02 1.E+01 4.0E-02 1.E+00 2.0E-02 1.E-01 0.0E+00 0.0E+00 5.0E+08 1.0E+09 1.5E+09 2.0E+09 ZBC2000 1.E-02 Dup-HikI Frequency [Hz] 1-mil FR4 1.E-03 C-Ply 1.E-04 1.E+05 1.E+06 1.E+07 1.E+08 1.E+09 1.E+10 Frequency [Hz] Istvan Novak, Valerie St. Cyr Thin laminate TecForum 8 DesignCon, 1/28/02

Impedance on Small Board Transfer-impedance (2) Impedance magnitude [ohm] 1.6E-01 ZBC2000 1.4E-01 Dup-HikI 1.2E-01 1-mil FR4 1.0E-01 C-Ply 8.0E-02 Impedance magnitude [ohm] 6.0E-02 1.E+01 4.0E-02 1.E+00 2.0E-02 1.E-01 0.0E+00 0.0E+00 5.0E+08 1.0E+09 1.5E+09 2.0E+09 1.E-02 ZBC2000 Frequency [Hz] Dup-HikI 1.E-03 1-mil FR4 C-Ply 1.E-04 1.E+05 1.E+06 1.E+07 1.E+08 1.E+09 1.E+10 Frequency [Hz] Istvan Novak, Valerie St. Cyr Thin laminate TecForum 9 DesignCon, 1/28/02