1. FEMAS Development - Progress
FEMAS Development Team
October 01, 2013

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 AFR
Calibration algorithm for symmetric structure
Finished
PDN Tool
In progress
GUI for MVTT
Causality & Passivity Tool
User Manual 25

26. Create DLLs for all FEMAS functionalities
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 26

27. Complete conversion tool (Network Parameters) Finished 09/14/13
Task
Description
Time
Complete conversion tool (Network Parameters)
Finished
09/14/13
Jay’s Problem (RLGC to S-parameters conversion is too slow for long length)
In progress
Full Impedance Matrix
HSpice and PSpice formats in circuit
In progress (Biyao, Testing)
Passivity & Causality (Magn/Phase, Time domain)
In progress (Testing)
PDN Tool
GUI for MVTT
11/03/13
Jitter decomposition (study)
In progress (Algorithm development, implemented in matlab) 27

28. Jitter calculation concept

29. Faster jitter calculation algorithm
Output
Peak-to-peak
Jitter histogram
Calculation complexity of the algorithm

30. Comparison with FEMAS simulation algorithm
results correlation
Bit-rate: 5Gbps
Rise-time: 30ps
FEMAS PRBS-9
FEMAS PRBS-15
Peak-to-peak: 41ps
Peak-to-peak: 37.8ps
MATLAB faster algorithm 9-bits
MATLAB faster algorithm 15-bits
Peak-to-peak: 37ps
Peak-to-peak: 43.6ps

31. Comparison with FEMAS simulation algorithm
Eye diagram
PRBS-9
FEMAS
MATLAB
(1.3s)

32. much faster calculations
Comparison with FEMAS simulation algorithm
calculations time comparison
New algorithm shows
much faster calculations
Time in FEMAS includes
Convolution
Eye-diagram calculation
Time in MATLAB includes
Coefficients calculation
Jitter calculations for all
bit patterns
Bit pattern
FEMAS
MATLAB
faster algorithm
PRBS-7/7-bits
9.87s
1.027s
PRBS-9/9-bits
21.49s
1.33s
PRBS-15/15-bits
255s
8.056s

33. Defining number of bits
Impulse response is infinitely long,
but after some length values are very small
So only finite number of previous bits
will impact output value at certain point
To decide what should be the length of
considered bit patterns we can limit the
energy of impulse response that is neglected
as impulse response is cut at certain length

34. Jitter dependence on bit pattern length
P2P jitter value is converging if neglected energy is going to 0
For this example 17 bits length is enough.
It’s neglecting 0.1% of impulse response energy

35. Jay’s problem
Jay has a simple geometry of Twinaxial cable and the goal was to obtain s-parameters.

36. Jay’s problem
The major part of saved information are fields and meshes for each frequency sample, If we don’t need to calculate fields than it is better to check “Only RLGC matrices”.

37. Jay’s problem 1m cable can be calculated in about 1min
3m cable can be calculated in about 7 hours
10m cable – plus infinity (It was running during 3 days, but could not be finished )

38. Jay’s problem
S-Parameters are calculated by the following formulas
The main problem is to calculate components, because it is series of
For Jay’s example ZY for high frequencies was about and if length will be 10

39. Jay’s problem Cascade 10 am cable
It will not work because of reflection between ports (It will work only if we will remove ports from 1m cables)

40. Jay’s problem
The idea of the new algorithm is, somehow divide the transmission line into small parts and cascade them correctly
We have some combination of sin hyperbolic and cosin hyperbolic functions
Calculation of this function if the argument is small is very easy (we can keep just couple of terms), so we need to express high argument sin and cosin hyperbolic functions with smaller arguments:
If I will calculate cosH and sine H even for l/1000m I can reach l meter in 10 steps –
2^10 = Number of operations will be:
5 matrix multiplication + 10 matrix operation = 15 matrix operation for each frequency.

41. PDN: Functionality FEMAS PDN TOOL RESULTS S-Parameter Results (FD)
After running FD in Power PEEC
Noise Voltage (TD)
After running TD in Power PEEC
Power PEEC circuit File(*.ciin)
Converting to Power PEEC input
HSPICE Netlist(*.sp)+Sub-ckt(*.ckt)
Export circuit as is.
Sub-circuit File
[*.ckt]
HSPICE Netlist File
[*.sp]
Can be used HSPICE/PSPICE/ADS, etc as
An Example of FD simulation to find Impedance of PDN
Performs following functions
Exports touchstone file(needs a filename).
Needs to include the PDN sub-circuit( needs the *.ckt filename)
Can be used with any spice netlist for
TD/FD Simulation
Co-Simulation with Package models+ IC models+..
SI/PI Co-Simulation for evaluating noise coupling, jitter,etc

42. HSPICE File Structure Filename Returns a sub-circuit string
Sub-circuit File = XX.ckt
HSPICE Netlist File = XX.sp
Blah
Rxx 1 2 R= freq*constant
Rxx 3 4 R= sqrt(freq)*constant C… L…
Blah Blah
include “sub-circuit filename = XX.ckt” …
.ac
+spara = touchstone
+Filename = XX.sNp
Filename
getCktStr()
getHSPICENetlistStr(FileName)
Returns a sub-circuit string
Returns a HSPICE netlist
Declarations:
std::string getCktStr()
std::string getHSPICENetlistStr(std::string)

43. LIJ File If the Lij filename is mentioned in input file
Lij calculation part
Input File …
LijFileName YYY.csv
Read “YYY.csv”
Success
Fails
Calculate Lij
Read into a Matrix
Write to a File (use same name)
If the Lij filename is NOT mentioned in input file
Lij calculation part
Input File …
No File Name
Calculate Lij
Write to a File (what name?)

44. Questions For SPICE file How to deal with Freq dependent R?
Is it important that the filename should not be passed to the engine?
No file is written in the engine,
Need to mention in the file:
the sub-circuit filename to include and,
touchstone(sNp) filename to write after FD analysis
For Lij File
Always save after a new calculation?
If option is provided to the user
In GUI only or also in Text File?
What filename to save with, if no LIJ Filename is mentioned?

45. Spice Conversion: DC Analysis Test & SubCircuit
Node 1 2 3
Hspice
Pspice
Power PEEC Spice -5
SubCkt
2 SubCkt
5 V 1 3 2
R1 1K R2 1K R3 2K R4
SubCkt

46. AC Analysis Test
PowerPEEC
R1 1K
C1 0.5uF 1 2 A Vs

47. Tran Analysis Test C1
5pF 2 1
R1 500

48. Using Power PEEC SPICE In FEMAS Original
Some HSPICE/PSPICE File Data
Converter
Convert Ports to Sources
For Include files
Power PEEC
LoadFile
(Simple ASCII file reader)
Calculate Scattering Params from Node Voltages
S param
Biyao
Mikhail / Alexander
GUI will have to read and identify ports – So more convenient to do it on converter side
Need only *.ciin export option to run in Power PEEC outside FEMAS

49. Using Power PEEC SPICE In FEMAS Modified
SPICE File Data,
File Type = HSPICE/PSPICE
Export/Run Flag
Convert Ports to Sources
Converter
Power PEEC Solver
Export
Run
For Include files
Calculate Scattering Params from Node Voltages
S param
Load File
(Simple ASCII file reader)
Biyao - Done
Mikheil / Alexander

50. PDN Spice File To Power PEEC Spice
Description/Notes
Mutual Inductance K
name ind1 ind2 mutind delay 
Unit: uH
SubCkt
Load the SubCkt into main file
Support embedded subCkt
Port
Change port to source
Tool input
Main file content
File type
Export flag
Load subCkt file into the main file
Convert Hspice / Pspice into PowerPEEC spice
Return the outputString

51. Spice Converter Struct
Variables/Functions
Description/Notes
RLC
Make changes according to the categories
mutualK
Ind
depSource
subCkt
subCktDefn
commentR & emptyR
Delete
port
If need export, add source impedence
analysis & plot & isave & vsave
DC, AC, Tran, print, plot, probe
PspiceToPowerPEECSpice
Change Pspice file to PowerPEECSpice
HspiceToPowerPEECSpice
Change Hspice file to PowerPEECSpice
loadFile
Load the subCkt file

52. Create DLLs for all FEMAS functionalities
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
Jitter decomposition (study)
In progress (Algorithm development)
Complete conversion tool (Network Parameters)
Comlpeted
HSpice and PSpice formats in circuit
In progress (Biyao)
Passivity & Causality (Magn/Phase, Time domain)
In progress
PDN Tool
09/07/13
GUI for MVTT
11/03/13
Update User Manual 52