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, Venaria Reale (Torino) - ITALY ● Mr. Emmanuel LEROUX HDT ITALIA S.r.l. Corso Trapani, Torino - ITALY ● Mr. Andrea DELMASTRO EDM-INFORMATICA Corso Trapani, Torino - ITALY

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

The WHAT-IF windows. 3

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.

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

Noise sources: the Electrostatic Discharge Noise Source I Gs TIME[nS] ESD Current (A) ESD noise source (PWL) 6

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

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

Models: the discrete components. B1 AS1AS TIME[nS] S[]S[] S11 meas.S11 meas. S11 simul.S11 simul. 9 S 11 at one pin of a 1nF capacitor

In In In OUTPUT 1 19 OUTPUT V CC 16 V REF 15 I SET 14 GROUND OUTPUT 5 11 TEST/RESET In 1In 1 In 3In 3 OUTPUT 4 OUTPUT 3 LM OFF CONDITION The value for each resistor is 100MEG B1 AS3 + - In kIn k OUTPUT k GROUND k B2 B3 A S1 A S TIME[nS] PWL S [r] Models : the analog devices. 10

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.

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 LM 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 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 Measurement/simulation comparison: the 100 MHz noise TIME[nS] P1_8 meas. P1_8 simul.

Measurement/simulation comparison: the 900 MHz noise U1_6 simul V [mV] U1_6 meas TIME[nS] 15 U1_5 simul.U1_5 meas.

With/without C FILTER comparison: the 100 MHz noise TIME[nS] V [mV] U1_6 without C FILTER U1_5 without C FILTER U1_6 with C FILTER U1_5 with C FILTER

With/without C FILTER comparison: the 900 MHz noise V [mV] U1_6 with C FILTER U1_5 with C FILTER U1_6 without C FILTER U1_5 without C FILTER TIME[nS]

With/without EMC-filter comparison: the 900 MHz noise V DIFF [mV] Without Filters With Filters TIME[nS]

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