Applied Microwave Electromagnetic Software

Interfacing Sonnet’s
Electromagnetic Software with
Existing Design Flow
 Using Sonnet with Other Tools 
2000年12月13日
James C. Rautio
MWE2000 Sonnetセミナー
Sonnet Software, Inc.
Email: [email protected]
WWW: http://www.sonnetusa.com
1
How Does Sonnet Work?



Meshes only metal of
circuit.
Calculates voltage
generated by current
from each subsection.
Adjusts current on all
subsections for zero
total voltage on all
conductor.
2
First Circuit







Set Units.
Specify box size.
Specify cell size.
Specify substrate.
Draw circuit.
Add ports.
Save file.
3
Analyze the Circuit




Set frequencies.
Check “Make emvu
file” for current
distribution.
Click “Run”
When done, click
“Open Graph” and
“Open Emvu”.
4
Open Graph




More curves
can be added.
Several files in
one plot.
Output to
printer.
Many options.
5
Open Emvu




Red is high
current.
Blue is low
current.
High current on
edge is important.
Animation with
frequency or time.
6
Sonnet ebridge
Plug-in Integration with Agilent ADS

Start with
an ADS
schematic
7
Sonnet ebridge
Plug-in Integration with Agilent ADS

Generate
ADS
Layout

Send to
Sonnet
8
Sonnet ebridge
Plug-in Integration with Agilent ADS

ADS
layout
now in
Sonnet
9
Free Interface to Ansoft Serenade

Start S2A
10
Free Interface to Ansoft Serenade

Use S2A
to create
Sonnet
geo file.
11
Free Interface to Ansoft Serenade

Serenade
layout in
Sonnet.
12
Free 3-D Sonnet File Viewer

View of
Sonnet
layout in
geo3d.
13
Mentor Graphics to Sonnet

3 interfaces from Mentor Graphics PCB/IC
design environments to Sonnet
– 2 interfaces for polygon transfer based on GDSII
standard format
– 1 intelligent interface for components & routing
data transfer based on Sonnet 6.0c GEO file
format
14
Mentor Graphics to Sonnet

Uni-directional interface based on GDSII data from
Board Station to Xgeom
– Available for all designs with Board Station RF option

Bi-directional interface exports/imports GDSII data
from IC Station to Xgeom
– Extract inductors/interconnects on Silicon
– SPICE lumped element and lossy dispersive transmission
line (LDTL) models supported by ELDO-RFIC simulator
15
Mentor Graphics to Sonnet

Bi-directional interface exports/imports GEO files
from Board Station to Xgeom
– Available with Board Station C4s and Sonnet 6.0c
– Polygons grouped with the matching geometries in
Board Station to allow update of all information
– Arbitrary PCB polygon layout for RF structures in
Xgeom
– PCB/SMT co-verification with downstream circuit
simulator
16
Interface Via Touchstone Files


Nearly any high frequency software can
read Touchstone formatted files.
Touchstone files are the default generated
by Sonnet.
! Primary 50 Ohm S-Params. Mag/Ang. Touchstone Format (S11 S21 S12 S22):
# GHZ S MA R 50
! Pre-computational time (seconds) -- Subsectioning: 2, Caching: 3188
! Analysis time per frequency (mm:ss) -- 0:02 user, 0:00 system, 0:02 real
! Analysis time per function (seconds) -- Modes: 0, Fill: 0, Solve: 1
19.0000000 0.601312 -111.9 0.637791 -124.9 0.637791 -124.9 0.375313 33.095
19.1000000 0.602537 -112.5 0.635509 -127.4 0.635509 -127.4 0.379089 28.871
19.2000000 0.603703 -113.1 0.633224 -129.8 0.633224 -129.8 0.382505 24.695
17
AutoCAD Interface



Sonnet can import and export AutoCAD dxf
files.
Full details in the Sonnet manual.
GDSII Stream files can be imported and
exported just like AutoCAD dxf files.
18
Importing DXF/GDSII Files


File import is
invoked from the
Sonnet Task Bar
Import brings up a
Sonnet command
window
Click Here
19
File Import Command Window
Command line
Execution dir
Translation
messages and
warnings
20
Exporting to DXF/GDSII
Click Here
21
Sonnet Interface to Excel


Create .csv
(comma
separated
values) file
for Microsoft
Excel
Click Here
Use
Advanced
Options
22
Sonnet Interface to Excel Example


Measured data
is average of 8
measurements
Top curve is
two times the
sample
standard
deviation
Easy to do with
data in
spreadsheet
Metal Loss For A 6 mm Microstrip Line
0.1
0
S21 Magnitude (dB)

-0.1
-0.2
-0.3
-0.4
Average Measured S21 (dB)
-0.5
Calculated S21 (dB)
Two Sigma
-0.6
-0.7
0
2
4
6
8
10
12
14
16
18
20
Frequency (GHz)
23
Sonnet Interface to SPICE


Check .lc
file name
for SPICE
lumped
model.
Specify two
frequencies
for analysis
Click Here
24
Sonnet Interface to SPICE



Output for lumped
model (*.lc).
To check validity,
analyze for second
pair of
frequencies.
Value of lumped
elements should
change very little.
.subckt 1 2 3 4 5 6
C1 1 0 0.19pf
C2 2 0 0.18pf
C3 3 0 0.19pf
C4 4 0 0.19pf
C5 5 0 0.18pf
C6 6 0 0.19pf
L1 1 4 1.40nh
L2 2 5 1.40nh
L3 3 6 1.40nh
K1 L1 L2 0.17
K2 L1 L3 0.05
K3 L2 L3 0.17
.ends
25
Sonnet Interface to SPICE


Check .lct
file name
for SPICE
lumped
model.
Specify
one
frequency
for
analysis.
Click Here
26
Sonnet Interface to SPICE



Output for SPICE multiple conductor
transmission line model (*.lct).
For this example, N = 3 (three coupled
lines).
Models for thousands of lines possible.
.model ymod tra nlines=3
+ lmatrix=
1.112082n,0.236725n,0.072213n,0.947766n,0.236786n,
1.112148n
+ cmatrix=
0.380590p,-0.032194p,-0.001093p,0.351987p,
-0.032194p,0.380587p
27
Free Cadence Interface to Sonnet


Layout in
Cadence
Virtuoso for
export to
Sonnet.
Free “Skill”
code plugin
28
Free Cadence Interface to Sonnet

Dialog box
for
exporting
layout to
Sonnet.
29
Free Cadence Interface to Sonnet

Layout now in Sonnet, viewed with geo3d
30
Free Cadence Interface to Sonnet



Interface is
bi-directional
Filter layout
in Sonnet
Will transfer
to Cadence
31
Free Cadence Interface to Sonnet

Dialog box for import into Cadence
32
Free Cadence Interface to Sonnet

Filter layout
imported from
Sonnet to
Cadence
Virtuoso
33
Sonnet Netlist Interface




Big problems must be
divided into several
small problems.
Here, we divide the
problem into three
small problems.
Each small problem
analyzes quickly.
Stray coupling across
divisions not included.
34
Sonnet Netlist Interface



Analyze each piece
at a few frequencies
over the band.
Interpolate each
result to many
frequencies.
Connect back
together.
Filter_in
Filter_coup
Filter_in
(flipped)
35
Filter Analysis Netlist
DIM
FREQ
GHZ
CKT
GEO
GEO
GEO
DEF2P
123
2345
654
16
FILEOUT
filter TOUCH
FREQ
SWEEP
filter_in.geo
OPT=vd CTL=ctl.an
filter_coup.geo OPT=vd CTL=ctl.an
filter_in.geo
OPT=vd CTL=ctl.an
filter
filter.rsp
S MA R 50
40.0 65.0 0.1
36
Complete Filter Analysis
37
Conclusion



Sonnet is appropriate for 3-D planar circuits.
Sonnet is based on the 2-D FFT and is thus very
robust and accurate compared to numerical
integration techniques.
Sonnet can interface with Agilent, Ansoft, Mentor,
Cadence, and many other tools.
38

Download Report