1. FEMAS Development - Progress
FEMAS Development Team
February 26, 2015

2. Working Plan Task Description Status Estimated Time
2D Cross. Sect. Analys. Testing
Database for 2D cross. sectional analysis testing
Done
06/12/2012
2D Cross. Sect. Analys. Testing Matrix
Matrix description for 2D cross sectional tests
Released New Version
Released Version of FEMAS
06/05/2012
Long-Term Plan
Including known problems/features and input received during EMC consortium
License file
License file - not only in program file
05/28/2012
2D Cross Sect. Task
In 2D cross sect. analysis will be added possibility to correct RLGC data because of “roughness effect”
Export/Load Plot to/from File
Will be added possibility to save/load plot data and settings into/from the file 2

3. Working Plan Task Description Status Estimated Time Delay Problem
Implemented new algorithm, which makes impulse response “Physically causal”
Done
05/21/2012
Circuits
Circuit block in LPA
2D Cross. Sect – Task
2D cross sect. analysis was transformed from tool to task
Pre-emphasis filter testing
Will be compared matlab and FEMAS results
06/26/2012
Documentation
Developers level: descript. of funct.
Users level: Users manual
07/10/2012
Description of algorithms
07/24/2012 3

4. Working Plan Task Description Status Estimated Time
S-parameters Analysis
Technical specification - Updated
Done
07/10/2012
LPA Testing
Database for Link Path Analysis Testing
Implement help system
User’s manual will be converted in html format and added in FEMAS help
Smoothing filter
Change Wp and Ws parameters from rad/sample to frequency Hz
Changes according to Matteo’s suggestions
Default values, Pre-emphasis taps, Move blocks in schematic matrix, arrange names of channels alphabetically 4

5. Working Plan Task Description Status Estimated Time
Change Linear Interpolation Method
We need to interpolate magnitude and phase instead of real and imaginary parts
Done
07/24/2012
Modify pre-emphasis filter
Implement pre-emphasis filter with any number of pre and post taps
Units
Add units everywhere it is possible: Sources - VHigh, VLow, rise/fall time, bitrate, delay, also in eye diagram
Student License
Limited functionality for students
Smoothing Filter Testing
Test smoothing filter and created test report
Update User’s Manual and Functionalities
Users manual and functionalities where updated according changes made during this two week 5

6. Working Plan Task Description Status Time Student License Modified
Custom geometry for 2D Cross Section Analysis is allowed – restriction is 3 traces
Done
07/31/2012
Smoothing Filter
Add option to choose smoothing method: Butterworth/Chebyshev
Jitter Analysis for Input Signal
Added: Random Jitter, Duty Cycle Distortion and Periodic Jitter to the Source Waveform
Fixed bug in AC simulation
New Release
Will be created new version 6

7. Working Plan Task Description Status Time
Added Possibility to Calculate All Tasks in the Project
Added button “Calculate All” in LPA projects
Done
08/14/2012
Signal Analyzer
Added new tool “Signal Analyzer”
Improved LPA Performance
Added possibility to begin or finish channel with 1 port s-parameters block
Testing of jitter injection
Tao has tasted jitter injection for input waveform
Tested Conversion from Time to Frequency Domain
Compared matlab fft FEMAS Conversion tool and Analytically calculated results for Gaussian, Step, … signals
08/21/2012
Added Validation Check in LPA
Will be calculated recommended frequency range for s-parameters and checked if
Added Filter: Inter-Symbol Interference (in GUI) 7

8. Working Plan Task Description Time Custom geometry
It will be possible to create custom geometry from GUI
Done
08/28/2012
T and P Network sequence
In circuit models will be added possibility to define sequence of parallel and sequential T and P networks – Technical Specification
Tx Equalization – De-emphasis
Tx Equalization now consists Pre-emphasis and De-emphasis 8

9. Working Plan Task Description Time Custom geometry
Added – Triangle, Trapezoid, Circle and Ellipse
Done
09/04/2012
Prepared Environment for DLLs
FIR Equalization
Functionality for De-emphasis, Pre-emphasis and FFE equalization is done
FFE Optimization
Functionality for FFE optimization is done
DFE Equalization
Functionality for DFE equalization is done 9

10. Working Plan Task Description Time
Parallel and series of circuit elements
Add possibility to define Parallel and series of circuit element
Done
09/11/2012
Mutual inductance
Integrate possibility in FEMAS to use mutual inductance
Improvement in custom geometry
Added possibility to remove regions from custom geometry
Custom geometry - Description images
Added description images in GUI for custom geometry
09/18/2012
Tested different cases
Change Student License Activation
License issues will be updated according to new specification
Description of functions in Equalization.dll
Created documentation for Equalization: Description of functions and used algorithms (Only CTLE optimization left) 10

11. Working Plan Task Description Time FEMAS interface for equalization
Prepare FEMAS interface for equalization
Done
10/02/2012
Description of functions in Equalization.dll
Added CTLE optimization
09/25/2012
Equalization.dll
CTLE optimization was added
Test Equalization
Preliminary testing for all functionalities is done.
Integrate Equalization
Integrate equalization into FEMAS GUI
10/16/2012 11

12. Working Plan Task Description Time Tx equalization with gain
Added calculation of tx equalization using gain
Done
10/23/2012
Mathematical operations with equalized waveforms
Added mathematical operations with equalized waveforms for terminations
Post processing Rx equalization
Added possibility to calculate best coefficients and equalize signal without channel calculation
Frequency depended complex impedance
Added frequency depended complex impedance for sources and terminations
Updated documentation
All documentation was updated
Created New release 12

13. Working Plan Task Description Time Export Debye Model
Corrected export debye model format
10/30/2012
Load training signal from source
Added possibility to load training signal for ffe and dfe optimization from source
Add CTLE block between s-p blocks
CTLE block can be used everywhere in the channel
De-embedding tools was added
Separate tool for de-embedding of s-parameters was added, de-embedding from multiple s-parameters sequence was added and tested
12/11/2012
S-parameters.dll
Was created S-parameters dll and implemented in GUI, we are working with causality function 13

14. Working Plan Task Description Time
Odd and Even mode velocities and impedances
Corrected formulas for odd and even mode velocities and impedances (differential case)
01/15/2012
MVTT
MVTT as a separate tool added
De-embedding Tool
We make tool more intuitive and added graphical representation of the channel
Causality Enforcement
New mathematical solution was developed and implemented in Matlab, now we are implementing into FEMAS
01/22/2012 14

15. Working Plan Task Description Time
odd and even mode velocities and impedances
Tested odd and even mode velocities and impedances
01/22/2012
MVTT Tool
Added possibility to load multiple input files and run them together
Scripting
Enabled scripting for MVTT
New simulation type: De-embedding
Added new type of simulation for more complicated de-embedding
Causality Enforcement
New algorithm for causality enforcement was implementing into FEMAS 15

16. Working Plan Task Description Time
Generate Release for Separate FEMAS tools
Structure of FEMAS was changed and now we can generate FEMAS release with separate tools
02/05/2012
De-embedding
Some restrictions were removed and task became more complete
Transfer function (S-pa5ameters) Extrapolation
Mathematical algorithm for extrapolation was established
MVTT
Dazhao is working with MVTT problems
In Progress 16

17. Working Plan Task Description Time Scripting
Handled scripting functionality: All scripting functions now throw exceptions on errors, Added test files to all the script examples
02/26/2013
FEMAS help information in console
Added output of some help information in console mode
Material Fitting
Added option which allows to fit material with Epsilon and Sigma infinity to be more than some value
Network Parameters Tool
Added new tool “Network parameters” – Now it is possible to convert Z-parameters to S-Parameters and vice versa
03/05/2013
Changed interface for material fitting options – added Debye model formula and parameters explanation 17

18. Working Plan Task Description Time Plot Multiple Probe Results
Added possibility to plot multiple probe results in one probe
03/12/2013
Multi Region Conductors
Begin implementation to model multi-part conductors in 2d cross sectional analysis tool
In progress
Transfer function (S-parameters) Extrapolation
We are developing mathematical methods
In Progress
MVTT
New function are implemented 18

19. Working Plan Task Description Time Symmetric geometry
Now it is possible to calculate automatically several parameters to make geometry symmetric
03/19/2013
Pause in 2d cross sectional analysis
Now It is possible to stop 2d cross sectional analysis calculation and then continue form the next frequency
Multi Region Conductors
We need to modify core as well – and we need Hanfeng’s help
In progress
Transfer function (S-parameters) Extrapolation
New algorithm was implemented in matlab, now we need to implement it into FEMAS
In Progress
MVTT
New function are implemented 19

20. Working Plan Task Description Time Drawing Tool
New features where added in drawing tool
03/26/2013
PDN Noise Tool
New tool (GUI part) is added and corresponding algorithm was developed in Matlab
Transfer function (S-parameters) Extrapolation
The algorithm was implemented in FEMAS
MVTT
New functions where added
In Progress 20

21. Working Plan Task Description Time
Changed Debye parameters export format
04/23/2013
Changes was made in Cavity Tool interface
Added separate units for dimensions, changed captions
DC extrapolation
Some tests was done for DC extrapolation and algorithm was improved
MVTT Testing
Testing
In Progress
Network parameters
single-ended to differential conversion tool 21

22. Working Plan Task Description Time Cavity Tool Testing Testing
06/24/2013
MVTT Testing
Network parameters
single-ended to differential conversion tool – GUI part is added
Improved cascading and de-embedding interface
Improved port definition interface for cascaded block 22

23. Working Plan Task Description Time MVTT Add diff port
Adding diff port support for MVTT
In Progress
Equalization – DFE problem investigation
Problem was solved
07/02/2013
Improved Plot Tool
Description of all function will be included in code and documentation will be generated automatically
Documentation
We are documenting function inside the code and creating documentation automatically using Doxygen 23

24. Working Plan Task Description Time TDR/TDT Tool AFR
Finished
AFR
Calibration algorithm for symmetric structure
In progress
Signal analyzer
Add differential signal
PDN Tool
User Manual 24

25. Working Plan Task Description Time AMI source models
Create DLLs for all FEMAS functionalities
Drawing tool for 2D cross sect analysis
Differential Sources and probes
Conductor plating
Finish at surfaces 25

26. Working Plan Task Description Assigned Time
MVT GUI - Add port definition for output matrix
Done
Nana
03/18/2014
MVT GUI - Add section for adding multiple Vias
03/21/2014
MVT Engine – Trace port conversion
In Progress
Dazhao
03/25/2014
MVT GUI – Feedback picture concept
Me, Ketan
Some bugs fixing
Misha
Improved scripting part, added interpolation in cascading function
AlexS
MVT Testing
We will begin MVT testing from this week
Dazhao, Me 26

27. Working Plan Task Description Assigned Time Smith Chart
Corrected Smith Chart calculation
Mikheil
04/29/2014
MVT GUI – Feedback picture implementation
Added: Components
Left: Total geometry
Nana
MVT GUI Geometry Check
Added geometry checking functionality
Mikheil, Nana
MVT Engine
Error related with components s-parameters cascading (In progress)
Ketan, Misha
TDR/TDT Tool
Added differential and common mode impedances
Mikheil, Misha
Create Release with MVT GUI 27

28. Working Plan Task Description Status Time Surface finish
Add additional layer on the top of microstrip
Done
Student License
Implemented restrictions for student license
New license generator with GUI
Made the following changes:
a) License type can be modified by user
b) Hardware independent license can be created only for student type
Jitter Injection
QA checking group found that jitter injection functionality was not working. We have fixed this issue 28

29. FEMAS Tasks Task Description Time Export S-Parameters from swept RLGC
Added functionality for creating S-Parameters from swept RLGC data
Done
Trace spacing swept parameter
Added trace spacing swept parameter for microstrip and stripline
Filter swept geometries
Remove invalid geometries from swept cases, Add output messages to inform which geometries can not be calculated
Visualize results for swept geometries
Fields and RLGC parameters are fixed and plotted for each swept geometry
Export S-Parameters, W-Element
S-Parameters and W-Element can be fixed for each swept geometry and exported into touchstone file
Export impedance matrices
Export impedance matrices for all swept geometries into csv file
Optimization in 2DCSA
Find the geometry which will corresponds to a chosen impedance value
In Progress
PAM4 in FEMAS
Channel analysis for PAM4 signals will be implemented
Update User’s manual 29

30. Sweeping parameters Cable Microstrip Stripline Inner Conductor Radius
Insulator Thickness
Trace width
Trace spacing
Dielectric height
Core height
Cable
Microstrip
Stripline

31. Checking geometry: Microstrip/Stripline
For microstrip and streepline sweeping parameters are:
Trace width (w)
Distance between traces (s)
Dielectric thickness (h)
a) If the geometry was correct, then after sweeping h we still obtain correct geometry
b) The following conditions should satisfy w and s:
s>w + 2* t*tan(teta - PI/2)
d>w/2 + t*tan(teta - PI/2)
Incorrect values of sweeping parameters will be detected before calculation and will be removed and corresponding message will appear:
50 mil distance between traces, 70mil trace width and 40 mil dielectric thickness corresponds to incorrect geometry
50 mil distance between traces, 80mil trace width and 40 mil dielectric thickness corresponds to incorrect geometry
60 mil distance between traces, 80mil trace width and 40 mil dielectric thickness corresponds to incorrect geometry
70 mil distance between traces, 80mil trace width and 40 mil dielectric thickness corresponds to incorrect geometry …

32. Results: RLGC
User can select geometry and see RLGC values

33. Results: RLGC
User can select geometry and plot RLGC values

34. Checking geometry: Microstrip/Stripline
Sweep Parameters for microstrip:
80mil
90mil

35. Checking geometry: Microstrip/Stripline
For microstrip we have three swept parameters:
Conductor size; Dielectric thickness; Trace spacing
After selecting swept parameters, S-Parameters / W-Element for corresponding geometry will be created and exported into touchstone file

36. Results: Microstrip S-Parameters
80 mil
90 mil

37. Results: Characteristic Impedance
Export Characteristic Impedance

38. Results: Export Characteristic Impedance
Frequency
Conductor size
Dielectrics thickness
Trace spacing
Impedance 1
Impedance 2

39. Result: Plot Characteristic Impedance
Export Characteristic Impedance

40. Impedance Optimization: Microstrip
Step1. User will choose sweeping parameters for optimization
Step3. All possible geometries, corresponded to sweeping parameters will be calculated; optimal “Trace width”, “Trace spacing” and “Dielectric height” will be written
Step2. User will check “Optimize Impedance” section and will choose optimal value for impedance and corresponding frequency value and click “Apply”
Step4. User can proceed, choose other parameters on the next tabs and calculate geometry with optimal impedance value

41. Optimize Impedance: Cable
Similarly optimization can be done with cable and stripline

42. FEMAS tasks Group 1: Transient eye
Steps
remark 1
Adding options for PAM4 and make necessary structural changes
This should be done in signal generation and any function related to response calculation
Started
Add QPRBSN generation 2
Add different PRBSN generation (Now only for prbs9, prbs15)
This part is for NRZ, but we need it for comparing PAM4 and NRZ for the same signals 3
Threshold generation for PAM4
Generation of slicers and use the slicers in some calculation functions 4
Changes in eye plot generation 5
Changes in transient eye parameters calculations 6
Add pdf, cdf, contours and bathtubes to transient eye using binheight and other option 7
Add calculation of image eyes (ps, mV, %) 8
Add receiver jitter
Create a form for different type noises 9
Modify transmitter jitter for PAM4 10
Changes in the existing equalizations for PAM4
Most changes are necessary in DFE

43. FEMAS Group 2: StatEye and Short Bit Sequence
Steps (Only for PAM4)
remarks 1.
Add options in the response calculation form for StatEye
Changes in GUI and some structures 2.
Add Functions for StatEye 3.
Add Image plots for Stateye (pdf, contours, bathtubes) 4.
Add options in the response calculation form for Short Bit sequence 5.
Add Functions for Short Bit Sequence 6.
Add Image plots for Short bit sequence 7.
Add receiver jitter to Stateye 8.
Add receiver jitter to Short bit sequence 9.
Add transmitter jitter to Short bit sequence
To compare PAM4 and NRZ, we need to implement the same methods (StatEye and Short Bit Sequence) for NRZ. It will take approximately half of the time of PAM4, as the main GUI and structures will be already created for PAM4.

44. FEMAS task - Signal generation in C++
QPRBS signal generation in C++
Example: 10Gbps, rise/fall time = 40ps, QPRBS7
Figure is now generated only as test in QT, no supporting interface yet in FEMAS.

45. FEMAS task – Transient Eye
Calculation of slicers;
Equalizations – FFE, CTLE, DFE;
PAM4 Bit-by-bit Eye generation;
Calculation of PDF, CDF, Contours, Bathtubes;

46. FEMAS task – StatEye Equalizations – FFE, CTLE, DFE;
Calculation of PDF, CDF, Contours, Bathtubes;

47. FEMAS task – Short Bit Sequence
Equalizations – FFE, CTLE, DFE;
Calculation of PDF, CDF, Contours, Bathtubes;

48. FEMAS Tasks Task Description Time
Drawing tool for 2D cross sect analysis
Differential Sources and probes
Conductor plating
Jitter decomposition 48