EMI-EMC Analysis and Noise Reduction on PCB

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Step 4 Emissions <strong>Analysis</strong> 1) Impedance <strong>Analysis</strong> 2) Decaps <strong>Analysis</strong> 3) Signal Extraction 4) Emissions <strong>Analysis</strong> 5) Enclosure Simulation Verify <strong>EMI</strong> is at acceptable level Optimize previous three simulations Underst<strong>and</strong> trends that cause radiation Isolate mechanisms to make informed tradeoffs
Real <strong>EMI</strong> Source into PCB � Translates time domain response into spectrum <strong>and</strong> pars these frequency domain data as voltage noise <strong>EMI</strong> sources into SIWAVE. � Emission analysis will use these voltage noise info. Ansoft Corporation 0.00 DDR CLK Spectrum Nexxim_PCB_MARELLI_SIwave_link_DDR_Write Curve Info dB(V(U28_CKP)) -10.00 -20.00 -30.00 -40.00 -50.00 -60.00 -70.00 -80.00 -90.00 CLOCK dB(V(U28_CKP)) Transient1 -100.00 0.00 0.10 0.20 0.30 0.40 0.50 Spectrum [GHz] 0.60 0.70 0.80 0.90 1.00 Ansoft Corporation DDR DQS Spectrum Nexxim_PCB_MARELLI_SIwave_link_DDR_Write dB(V(U28_DQSU_E2)) -5.00 -25.00 -45.00 -65.00 -85.00 -105.00 STROBE Curve Info dB(V(U28_DQSU_E2)) Transient1 -125.00 0.00 0.10 0.20 0.30 0.40 0.50 Spectrum [GHz] 0.60 0.70 0.80 0.90 1.00 Ansoft Corporation 20.00 DDR Power 1.8V Spectrum Nexxim_PCB_MARELLI_SIwave_link_DDR_Write Curve Inf o dB(V(DDR_U28_1V8)) 0.00 -20.00 -40.00 -60.00 -80.00 -100.00 -120.00 POWER 1.8V dB(V(DDR_U28_1V8)) Transient1 -140.00 0.00 0.10 0.20 0.30 0.40 0.50 Spectrum [GHz] 0.60 0.70 0.80 0.90 1.00
Page 1 and 2: EMI-EMC</s
Page 3 and 4: Coupling process Conduction Conduct
Page 5 and 6: � Loops in which currents flow ac
Page 7 and 8: Low |Z| at 50 MHz Near-Fields from
Page 9 and 10: Pwr Noise Signal P
Page 11 and 12: MIXED SIGNAL PCB Virtual Prototypin
Page 13 and 14: SIWAVE Physical Model Extraction FP
Page 15 and 16: Layout Import and
Page 17 and 18: 5 Steps for EMC <s
Page 19 and 20: Plane Impedance Simulation PWR Impe
Page 21 and 22: Step 2 Decoupling Capacitor <strong
Page 23 and 24: Resonance Simulation � Scans enti
Page 25 and 26: PCB Resonances and
Page 27 and 28: Choosing Correct Capacitor � Buil
Page 29 and 30: Impedance and Volt
Page 31 and 32: Add 2 decoupling capacitor on hot s
Page 33 and 34: What-IF Analysis:
Page 35 and 36: SIwave - EM Model Extraction � SI
Page 37 and 38: V(U28_DQ10_D3) [V] V(U28_DQ10_D3) [
Page 39: 1.90 1.85 1.80 1.75 1.70 1.65 What-
Page 43 and 44: WRITE DDR READ DDR Emission <strong
Page 45 and 46: Step 5 Enclosure Simulation 1) Impe
Page 47: MICROPROCESSOR CKP CKN DDR SDRAM U2

EMI-EMC Analysis and Noise Reduction on PCB

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