1. PREDICTION OF PCB SUSCEPTIBILITY TO CONDUCTED NOISE AT POST-LAYOUT LEVEL 1 ● Mr. Diego LASAGNA, Mr. Franco SCHINCO MAGNETI MARELLI S.p.A. - DIVISIONE ELETTRONICA Viale Carlo Emanuele II, 118-10078 Venaria Reale (Torino) - ITALY ● Mr. Emmanuel LEROUX HDT ITALIA S.r.l. Corso Trapani, 16-10139 Torino - ITALY ● Mr. Andrea DELMASTRO EDM-INFORMATICA Corso Trapani, 16-10139 Torino - ITALY

2. How could the user run a simulation with PRESTO_CNT™ ? CAD Extract from PCB editor the physical and electrical data. Field Solver algorithm to calculate Z 0, TD for each TL, L and C matrix for coupled lines. Link to Physical and Electrical Library to model the components on the board. Simulator engine SPRINT™. Output in ASCII format or with SIGHTS™. and more Link to equipment for EMC-models. WHAT-IF facility. EMC-filters to improve signal quality. NoiseSourcestostudytheboard susceptibility. Link to equipment for EMC-models Physical & Electrical Library FLOW MANA G ER Cad Extract Field Solver Simulator Output PRESTO_CNT™ FLOW Cad database 2 ReportsGraphic Viewer

3. The WHAT-IF windows. 3

4. The EMC model Library 4 A wide Physical & Electrical Library is provided. It contains: noise sources: a wide library of models which can be used to inject the noise in the nets and to study the propagation effects. Murata EMC-filters: a complete library of filters useful to reduce noise; the filters can be used to simulate the effects of aimed actions.

5. Noise sources: the Fixed Frequency Sine Noise Source V Rs + 0 TD V0 VA 1/ FREQ THETA t V(V) I(A) 5

6. Noise sources: the Electrostatic Discharge Noise Source I Gs 05101520253035404550 TIME[nS] 12 10 8 6 4 2 0 20 18 16 14 ESD Current (A) ESD noise source (PWL) 6

7. EMC-filters: how are they characterized ? 50  10dB attenuator 50  SG RF Voltmeter WriteaSPICE-likefilewithsome circuitparametersnot specified. The file must be described as shown in the figure. Run OPSIM™ which fits the insertion loss curve modifing the circuit parameters. Sample Impedance50  Transducer10dB (3k  -50  attenuator 5050 7

8. EMC-filters: the electric schemes. RIN1RIN1 LIN1 CIN1CIN1 BLM21 family RIN2RIN3 LIN2 CIN2CIN2 LIN3 CIN3CIN3 RIN4RIN4 LIN4 CIN4CIN4 CFORW COUTPAR ROUT LOUT LINLIN CFILCFIL LPAR RPARRPAR Families: DS306, NFA81R, NFM40R, NFM61R, NFV510, NFV610 8 CINPAR RINRIN

9. Models: the discrete components. B1 AS1AS1 -0.40 -0.60 -0.80 1.00 1.40 1.80 2.20 2.60 3.00 3.40 3.80 4.20 4.60 5.00 TIME[nS] -0.20 0.00 0.20 0.40 S[]S[] S11 meas.S11 meas. S11 simul.S11 simul. 9 S 11 at one pin of a 1nF capacitor

10. 1 + 2 - 1 3 + In 2 4 - 2 5 + 6 - 3 7 + In 4 8 - 4 9 + In 5 10 - 5 20 OUTPUT 1 19 OUTPUT 2 18 17 V CC 16 V REF 15 I SET 14 GROUND 13 12 OUTPUT 5 11 TEST/RESET In 1In 1 In 3In 3 OUTPUT 4 OUTPUT 3 LM1946 - OFF CONDITION The value for each resistor is 100MEG B1 AS3 + - In kIn k OUTPUT k GROUND k B2 B3 A S1 A S2 1.00 2.00 3.00 4.00 5.00 TIME[nS] PWL -0.20 0.00 1.00 0.80 0.60 0.40 0.20 1.20 S [r] Models : the analog devices. 10

11. Validation: the simulations. 11 An actual case is considered: the lights check PCB for lorry, because: –its behavior with RF-noise is known  it is possible to make comparisons; –there are both digital and analog devices  it is possible to verify the models; The noise sources are used: 100 MHz and 900 MHz fixed frequency sine noise source are used to simulate the RF-noise injected (e.g. cellular telephone). The EMC-filters and the WHAT-IF analysis are used: in order to provide the noise rejection.

12. Validation: the circuit. - R75R51 R69 R7 C20C20 C1 C2 R75 C34C34 C60C60 P1_8 P3_2 P3_8 P3_1 Component List U1 C1 C2 C20 C34 C60 R7 R51 R57 R69 R75 LM1946 4.7 nF 4.7 nF 100 nF 1 nF 0.1  560  33 K  8.06 K  560  U N 1CA P AC I T O R7 9 8P B 0 UN1CONN11B228PA0 UN1CAPACITOR50PA0 UN1CAPACITOR785PA0 UN1CAPACITOR927PB0 UN1CAPACITOR798PA0 12

13. 13 half-stiff coax. cable felxible coax. cable Power splitter HP8648C added ground plane TR321 HP54120 DSO TDRTDR Validation: the layout and the measurement setup. Soldered ground plane to define a unique ground contact point Multiple connection measurement setup is provided to perform all measurements

14. 14 Measurement/simulation comparison: the 100 MHz noise. 10.0015.0020.0025.0030.0035.0040.0045.0050.00 TIME[nS] 200.00 0.00 -200.00 -400.00 -600.00 400.00 P1_8 meas. P1_8 simul.

15. Measurement/simulation comparison: the 900 MHz noise. -200.00 -150.00 150.00 U1_6 simul. 100.00 50.00 0.00 -50.00 -100.00 200.00 V [mV] U1_6 meas. 25.0025.5026.0026.5027.0027.5028.0028.5029.0029.5030.00 TIME[nS] 15 U1_5 simul.U1_5 meas.

16. With/without C FILTER comparison: the 100 MHz noise. 40.00 35.00 30.00 25.00 20.00 15.00 10.00 5.00 0.00 -5.00 -10.00 -15.00 -20.00 -25.00 -30.00 -35.00 -40.00 TIME[nS] 10.0014.0018.0022.0026.0030.0034.0038.0042.0046.0050.00 16 V [mV] U1_6 without C FILTER U1_5 without C FILTER U1_6 with C FILTER U1_5 with C FILTER

17. With/without C FILTER comparison: the 900 MHz noise. -150.00 -120.00 -90.00 -60.00 -30.00 0.00 30.00 60.00 90.00 120.00 150.00 V [mV] U1_6 with C FILTER U1_5 with C FILTER U1_6 without C FILTER U1_5 without C FILTER TIME[nS] 25.0025.5026.0026.5027.0027.5028.0028.5029.0029.5030.00 17

18. With/without EMC-filter comparison: the 900 MHz noise. 60.00 50.00 40.00 30.00 20.00 10.00 0.00 -10.00 -20.00 -30.00 -40.00 -50.00 -60.00 V DIFF [mV] Without Filters With Filters TIME[nS] 25.0025.5026.0026.5027.0027.5028.0028.5029.0029.5030.00 18

19. Conclusions. into account before the first prototype realization. 19 PRESTO_CNTtoolvalidatedonanactualcase:good comparison between measurements and simulations; EMC model library: wide range of models fitted to conducted noise analysis; User friendly environment: the user can easily optimize the behavior of PCB for reducing susceptibility to conducted noise; Using PRESTO_CNT design cycle, measurement and time to market could be reduce: the EMC effects can be taken