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FlowCAD
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FlowCAD Confidential
Detect EMI Problems early with virtual
Prototyping
Simon Zubler
FlowCAD (Schweiz)
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FlowCAD Confidential
50 Years of Moore‘s Law
Moore’s Law was published on April 19, 1965 by Gordon E.
Moore, who was working as the director of R&D at
Fairchild Semiconductor.
The complexity of
electronic circuits doubles
approx. every 2 years:
(Number of constraints)
2^(x/2)
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FlowCAD Confidential
Cadence PCB Design Philosophy
Scalable Solution
A scalable tool solution can grow with future needs and
protects investment in libraries and designs for future
reuse. Cadence data base is upward compatible since
1990
Constraint Driven PCB Flow
Designs are getting more complex over time and more
design rules need to be followed. Cadence offers a fast
and clear view to all contraints with online DRCs
Efficiency
When design tools are used the whole day, the most
used actions need to be easy and efficient and with
less mouse clicks and mouse kilometers
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Products / Solutions for Electronic Engineers
Solutions
• PCB Layout
• PSpice - Simulation
• SI- and PI-Simulation
• Timing Analyse
• Thermal Simulation
• 3D mCAD-eCAD Integration
• CAM Verification
• Boundary Scan Test
• Protocol Analysis
• Reliability (MTBF, FMEA)
• CAD-Flow Management
• PLM and ERP-Interfaces
• IC Design and Verification
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The Challenges
• More Functionality
• Modularity of Products
• Parallel Developments (HW, SW)
• Late Changes on Products
• Growing Complexity
• Time to Market
• More Projects
• Same Resources
• Competitors
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Trial and Error
• Time consuming
• Costs
Design Create Prototype Measure/Test
Fix issues
Release
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The Solution
• Shorten Time to Market
• Change Management
• …
• Virtual Prototyping
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Virtual Prototyping
• Simulation throughout the Developments cycle
• Saves Time
• Saves Costs
Simulation of design concept
Simulation of
preliminary designs
Simulation of final design
Create prototype
Verification Release
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Virtual Prototyping
• Reduce Physical Tests to a Minimum
– Virtual Test of different Scenarios
• Functional Simulation of complete Systems
– During the Development Cycle
– Tolerances (Values, Timing)
• Thermal Behaviour of Devices
– Self warming
– Cooling Concept
• Creepage and Clearance Analysis
– PCB
– Housing
• PCB Design
– Impedance and Coupling, Resonance and Radiation
– Power Supply, Current Density, Capacitors
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NEXTRA Clearance and Creepage Analysis
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NEXTRA - ECAD / MCAD Integration
Native data exchange Native data exchange
MCAD ECAD
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Potential A – Potential B = 5mm
Potential A – Potential C = 1mm
Potential B – Potential C = 1mm
Pot
A
Pot
B
Fre
ier
Text
Fehler
Pot C 5mm
Fehler
Pot
A
Pot
B
Pot C
Pot
A
Pot
B
Pot C 5mm Pot
A
Pot
B Pot C 5mm
NEXTRA Air- and Creepage Analysis
Analysis includes
free copper because
it shortens the
creepage distance.
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Thermal Simulation
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Thermal Simulation
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PSpice virtual prototyping PCB systems
PSpice® Analog Behavioral
PSpice Functional Block Defined in C
PSpice SPICE Macro-Model
Cadence, the Cadence logo, Virtuoso, MMSIM and PSpice are registered trademarks of Cadence
Design Systems, Inc. All other trademarks are the property of their respective owners.
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IoT Design with PSpice Io
T
Te
stb
en
ch
Ps Vp(t)
DOUT
DIN Pr Vr(t) DAC
ADC Sensor [pressure => Vp(t)]
Regulator Δ pressure <=Vt(t)]
PSpice Mixed Signal
Controller Virtual Platform
RTL
Tra
nsa
cto
r
Hardware SystemC Testbench to
Represent IoT Environment
HIL
Hardware
in Loop
I/O
, T
imin
g &
Constr
ain
t M
odels
Minimal Modeling Effort
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Power Aware SI Analyse mit Sigrity
Current will take the way with least resistance
• DC: Ohm Resistance
• AC: Impedance
Forward and return current build a circuit.
Loops and stubs create antennas and
cause EMI issues.
AC
DC
AC
Layer stack up
with
Reference plane
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Signal Integrity Issues
VH
VL
Multi-Crossing Error
VH
VL
5V
GND
Overshoot / Undershoot
VH
VL
Oscillation
VH
VL
Threshold Error
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When starts „High-Speed“
• If Rise-/Fall time of transmitter is faster as 1/4 of Round-Trip Propagation Delay of the Net, you have the behaviour of a Transmission Line.
90%
10%
Rise Time ) <
Round-Trip
Propagation Delay
( 0.25 *
50
MHz
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SI-Problems are hard to “see”
• Let’s just look at two trace segments on a 6-layer PCB
• We see:
– 2 trace segments
– Same width
– Same impedance
– Different trace length
• Where is the problem?
trace9047 trace9048
trace9048
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What about the return path (reference planes)
• Trace9047 – 1 uniform impedance section
• Trace9048: – 4 different impedance sections
• No ideal plane layers! – Directly above and below
– Impedance discontinuities
• Does this matter?
– Depends
trace9048
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ERC – Trace coupling
• Trace9047 is one uniform
impedance section
• Trace9047 broken into 5
sections based on trace
coupling
– two section with no coupling
(1 & 5)
– two sections 2-line coupling
(2 & 4)
– one section 3-line coupling
(3)
1
2
3
3
4
5
1 2
3 4
5
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Graphical overlay on layout
Easy to locate source of trouble
• Impedance
• Coupling
Impedance Overlay Layout view
Ref. disconn.
due to
conjoined via
anti-pads
Reference discontinuities
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Coupling Coefficient Plot
• Diagram shows coupling
– Critical segments are in upper region
– Cross probing to see layout location
– Solution: Change layout with more spacing
Reference
discontinuitie
s
Double click for cross probing
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Typical Applications
• Screen board and identify worst case for further
analysis
• Investigate SI impact of design rule violations and
trade-offs
• Find out how to fix SI problems shown in SRC
simulation
• ERC is used to locate the problem
• Compare against ERC/SRC results with
– Known-good design
– Reference design
– Part of the design that has been fully analyzed
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Sigrity Electrical Rule Check
Easy to locate source of trouble
• Impedance
• Coupling
Easy SI performance interpretation
• Setup time < 2min
• Simulation time 10-20 min
• Reports with clear actions
• Setup No SI models required
Impedance Overlay Layout view
Ref. disconn.
due to
conjoined via
anti-pads
Reference discontinuities
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FlowCAD Professional Services
• Workshops
– http://www.flowcad.ch/de/news/events
• Trainings
– http://www.flowcad.ch/de/support-training/training
• Consulting
– http://www.flowcad.ch/de/services/consulting
• Simulation Services
– http://www.flowcad.ch/de/services
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Understanding High Frequency PCB Design
- High-Speed, RF and EMI
Day 1 - 3: Essential High-speed PCB Design for Signal Integrity
Day 4 - 5: PCB Design at RF – multiGigabit transmission, EMI control
and PCB materials
More information at
www.FlowCAD.ch
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Focus on Customer Satisfaction
Sales • Fair, competent advice
• Long term solutions
Support • Hotline, netviewer
• Survey
Service • PCB Design Services
• (Layout, simulation, migration)
Training • Trainings center, on-site
• Workshops
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FlowCAD Confidential
FlowCAD (Deutschland)
Mozartstrasse 2
85622 Feldkirchen bei München
Tel: +49 (89) 4563-7770
Fax:+49 (89) 4563-7790
FlowCAD (Schweiz)
Hintermättlistrasse 1
5506 Mägenwil
Tel: +41 (0) 56 485 91 91
Fax: +41 (0) 56 485 91 95
FlowCAD (Polen)
ulica Sasiedzka 2A
80-298 Gdansk
Tel: +48 58 342 75 94
Fax. +48 58 342 70 60
Für weitere Fragen und Informationen stehen wir gerne zur Verfügung
• Please don‘t hesitate to contact us
Kontakt zu FlowCAD / Contact us
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