Transcript Nessun titolo diapositiva

EM3DS 2007
www.memresearch.com
What is EM3DS
EM3DS is a very efficient 3D High Frequency Electromagnetic simulator for
structures involving multilayer substrates (e.g. semiconductor and
integrated circuits [MMICs], MEMs, printed circuits etc)
It implements a set of unique features (not found in any other software
in the EM modeling area, to the best of our knowledge):
• coupled EM/acoustic modeling for FBAR/BAW
• controlled current sources for modeling active linear FETs
• seamless 3D/2.5D switch to reduce numerical burden
• extraction of parameters for transmission lines with any number of
conductors
• unique calibration techniques: e.g. a generalized SOC method for
standard ports, a new method for Generalized Admittance Matrices for
waveguides
What about its solver
EM3DS is in the class of frequency domain, method of moments
(MoM) solvers, boxed formulation
Frequency domain (FrD) vs Time domain (TD)
• frequency domain is needed for high Q devices
• FrD is generally known to be more accurate, especially for resonant
circuits (e.g. filters)
• simpler definition of the material parameters (e.g. losses: dielectric are
usually characterized in frequency)
• TD is generally faster for broad-band calculation (FrD recovered by FFT)
• TD is needed for non-linear simulation
What about its solver
Method of Moments Vs Finite Elements (FEM), Finite Differences
(FD), Transmission Line Matrix (TLM)
• MoM is generally faster, in particular much faster when dealing with
multilayer where different layers have very different thicknesses
• MoM is not generally bound to iterative schemes (it is basically an
integral equation): no convergence issues
• MoM of EM3DS is applied to structures with metal boundaries (boxed
formulation): in this case there is a regular monotone increase of
accuracy increasing meshing
• MoM is not as general as FEM/FD/TLM: it is generally bound to a class
of devices
What about its solver
Boxed Vs Open Formulations of MoM
• Boxed MoM has generally a much larger dynamic range: unpaired
accuracy
• easy definition of ground in a boxed MoM
• useful to model interaction with the box in a shieleded environment
• Open MoM suitable for antenna problems; some class of antennas can
be handled by boxed MoM by using absorbing boundaries, but with
restrictions
• in Open MoM planar aspect ratio is less critical in determining the
computational time
Unlike other Boxed MoMs, EM3DS does not impose any grid to be used
when entering a geometry
A summary about other popular solvers
Software
EM3DS
Em Sonnet
IE3D Zeland
EmSight AWR
HFSS Ansoft
Momentum
MeFiSto
Microwave
Studio CST
Microstripes
FrD TD MoM
x
x
x
x
x
x
x
x
x
x
x
x
x
x
FD FEM
TLM
x
x
x
x
Boxed Open
x
x
x
x
x
x
x
x
x
EM3DS is the only MoM using volume currents (A/m2) to define conductors
in 3D mode; the other MoM use surface currents (A/m)
EM3DS main features
•
•
•
•
Parametric geometries and materials (the latter also frequency-dependent)
Full-wave optimizer
EM3DS 2007
tuner
Specialized for planar and quasi-planar layered structures, is also able to
model Dielectric Resonators, dielectric discontinuities, thick metals, and
active FET devices by using volume currents
• Includes 2.5D and 3D EM solvers with one click mode of operation change
• First EM software to include modeling of piezo-electric bulk acoustic wave
resonators (FBAR; coupled EM/acoustic modeling)
• Includes a broad-band Spice-model extractor
• Antenna charts (polar plots, far field 2D and 3D view)
EM3DS 2007
EM3DS main features
• Metal enclosure (shielded structures), absorbing boundaries (antennas) and
magnetic walls (symmetry problems)
• Script Engine (Pascal) for full customization of EM3DS
EM3DS 2007
• Internal ports (both planar and via): suitable for package modeling
EM3DS 2007
• Differential Ports
• Several new calibration techniques
EM3DS 2007
• SmartFIT, an adaptive frequency selection algorithm: response on 50-500
frequency points available from the analysis of 5-10 frequencies
• Asymptotic Evaluation: fast wide-band analysis
• Import/Export geometry in GDSII/DXF/BMP formats
• Seamlessly integrated in the AWR’ MW Office
EM3DS main features
• Handles external files in Touchstone format
• Includes a set of powerful pre- and post-processing tools in order to edit,
visualize geometry and current distributions in 2D and in 3D, to animate, to
create AVI and GIF movies, plot S/Z/Y/Antenna parameters in rectangular
and Smith’ charts, and much more
EM3DS 2007
• Also included is a linear circuit solver to connect lumped elements to the fullwave analysis
• Floating and node-locked licenses
+ Many existing features improved in EM3DS 2007
Applications supported
RF MEMS Applications
Electrostatic switches
(parallel/series/capacitive)
Resistive switches
EM MEMS switches
Tunable MEMS capacitors
Pacheco switch
Phase shifters
Inductors
FBARS
Microwave/Millimeter/THz wave Applications
Multilayer Microstrip, Stripline and Slotline circuits
Coplanar Waveguides (CPW)
RF and Microwave Packages
Thick lossy conductors
Dielectric discontinuities (Bricks)
2-port (multimode) waveguide components
Monolithic Microwave Integrated Circuits
Linear active devices
BAW Filters
Electro optical modulators
Planar Antennas
Thick/Thin film, LTCC
Applications supported
Packaging
Interaction circuit/packaging
Model extraction
Internal ports
RF Circuits
components in
components in
components in
components in
RFID
Remote controls
Security/Safety systems
Health Systems
Software Highlights
Geometry Creation and Meshing
• Powerful, easy-to-use builder (group selection, editing, mirroring etc)
• Seamlessly integrated with AWR Microwave Office – (RF circuit and
system simulator): AWR’ customers see EM3DS as an alternative engine
• Powerful GDS II (Data exchange with Coventorware), AutoCAD DXF and
BMP import filters
• User defined arbitrary dielectric stacks
• Supports lossy conductors and finite thickness geometries
• Very efficient Dielectric discontinuities (bricks) handling – no much
comp overhead
• Frequency dependent material parameters, entered as equations
• Geometry and materials are parametric
• Parameters can be tuned and optimized
• Topographic view and many 3D views updated in real-time
Software Highlights
Electromagnetic Solver Features
•
•
•
•
•
•
•
•
•
•
•
Fully 3D Method of Moments; works also in 2.5D mode
Proprietary Asymptotic estimator for reduced computation time (most info deduced
from the 1th freq. Of analysis)
SmartFit: adaptive selection of frequencies for resonant structures
Volume currents used for modeling as opposed to surface currents approximation
S-, Z-, & Y-parameter computation; group delay; Losses; Q; phase difference;
antenna measurements
Edge, internal, Via Port and differential ports
Full multi-port, multiple coupled line calibration and de-embedding to edge ports.
Feed port lines parameters (even for multiple asymmetric lines)
handles coupled acoustic/electromagnetic modeling
implements controlled currents (transconductive sources): useful for active non
reciprocal devices
electric and magnetic walls; absorbing boundaries
Software Highlights
Post-Processing and Tools
•
•
•
•
•
•
•
•
•
•
Rectangular and polar charts (Smith’s chart, radiation diagrams)
Several charts to plot volume currents and E-fields: standard surface plot, surface
plot with rendering, contour plot, vector and pseudocolor plot in 3D view
Calculation and plot of body force as response to magnetostatic field
Animate over time or frequency, and save animation as GIF and AVI
Automatic optimizer (modifies parameters and structure to reach a set of goals)
Linear circuit solver: connect em solution to other circuits, to lumped elements etc;
implements negative subcircuits for manual calibration
Wide-Band Spice model extractor: if SmartFit was used, it produces an equivalent
circuit perfectly reproducing the em response in the needed frequency band
Import/export circuit response as Touchstone file (S?P, Z?P, Y?P).
Batch Planner: to run a list of simulations
Symmetry Wizard: to evaluate the response of a symmetric 2N ports from 2 N-port
simulations
Software Highlights
Post-Processing and Tools
•
•
•
•
Pascal Script: customize EM3DS (modify also its menu!), accessing internal features
to handle calculated response, perform analysis and optimization, access variables
etc.
Waveguide calibration tool: to use EM3DS in a class of 2-Port waveguide
components
Multimode-waveguide calibration tool: experimental tool to recover the Generalized
Admittance Matrix (GAM) of a waveguide structure, possibly involving planar circuit.
Differential ports: they can be defined in post-processing, also to existing results or
imported data.
Software Highlights
Licensing
•
•
•
•
Node-locked and floating
multiple license: a license server handles requests in a LAN
License server can also run as a transparent service
Direct check for available updates in the MEM Research website
Some features in detail
SmartFIT
•
•
Adaptively selects a set of frequency points -in a user-desired band- where actually
the EM simulation is performed
Builds an optimal interpolation, providing the full-band response within the
prescribed accuracy
In this filter the full band
response over 300 frequency
points (green curve) is
predicted after adaptively
evaluating only 8 points (red
curve)
Some features in detail
SmartFIT
•
•
Here an example of a High Q Fbar resonator: 200 frequency points obtained from a
mere 7 point calculation
Dielectric resonators also strongly take advantage from this approach (easier to find
the in-band peak)
Some features in detail
Optimizer
Select which parameter
Select goal(s)
Select @ frequencies
Then RUN
Some features in detail
Optimizer
• Example: An interdigital microstrip filter, initially de-tuned, is automatically
tuned by the optimizer
Some features in detail
Tuner
or Tune it!
Some features in detail
Spice model extractor
• Extracts a lumped equivalent circuit, that mimics the EM response all over the
band, regardless the electrical length of the circuit
• This example shows an FBAR resonator: the graph compares the full-wave and
the spice model responses
Some features in detail
Coupled Acoustic modeling
Enter Mechanical
Specifications for the
dielectric/metal Stack
Create a variable to link
EM and acoustic models
Some features in detail
Coupled Acoustic modeling
• Example: filter in Agilent duplexer; comparison with measured data
Some features in detail
Pascal Script
• Powerful OOP compiler to customize EM3DS
Some features in detail
Thick Metals
How 2.5D tools does
handle thick metals?
A number of “sheets” with
only horizontal currents
and a number of vias with
only vertical currents
2.5D Model
In EM3DS, 3D mode, any
conductor has all current
components at the same time;
conductors may be sliced with
slices having finite thickness
EM3DS Model
Some features in detail
Thick Metals
• Benchmark: thick stripline, whose analytical solution is known (Zo=30.887);
neglecting thickness induces 25% error!
0.5 mm
1 mm
EM3DS achieves<0.8% with only 3 “slices” (mesh over thickness)!
Some features in detail
Thick Dielectric discontinuities
• Ability to model dielectric resonators
• e.g.: 1 slice (very quick!) gave 5% difference in resonant frequency with respect
to HFSS; 3 slices provided 3%
• Excellent trade-off speed/accuracy to simulate planar structures with DR
(typical application: tunable DRO)
Some features in detail
Antennas
• Far field charts and plots (below a circular polarized patch)
fields
currents
radiation pattern
Some features in detail
Controlled sources
• Modeling of a pHEMT Litton Lp7512
“control plane”: where
the control voltage is
calculated
gate
Depleted layer=“Control layer”
Channel
Controlled source…Id
they can model the channel current
in a FET: see the example
Some features in detail
Internal ports
• can be used to model e.g. packaging or to excite antennas (e.g dipole)
SC70
Printed Yagi Uda
Some features in detail
Magnetic walls/symmetry planes
• Enclosure walls can be perfect electric conductor (PEC), magnetic conductor
(PMC) and absorbing boundaries. PMC useful for symmetric structures.
Absorbing boundaries for antennas
PMC for symmetric structure
Some features in detail
MEMS applications
Pacheco switch
Mumps capacitor
Inductor
At a Glance
Editor view
Concluding
Pricing:
• lowest in the EM market
• affordable also for small companies and institutions
• discounted prices for Universities and qualified no-profit organizations
• discount for numbers
Testing:
• download the full version; trial time of 30 days; www.memresearch.com
• download the free limited versions
• for additional information contact [email protected]