Microelectronics & VLSI at IIT
Bombay:
Academic Programmes
J. Vasi
Department of Electrical Engineering
Indian Institute of Technology, Bombay
2003
Indian Institute of Technology
Bombay
1
Academia Industry Meet 2003, Electrical Engineering Department
Overview
• The Microelectronics Program is a part of EE
Department at IIT Bombay
• Microelectronics includes VLSI Design
• Links with the CS&E and ME&MS Departments
• Started in 1986; one of the oldest programs in the
country
• Main thrust in silicon CMOS design, VLSI CAD,
CMOS technology and devices, MEMS
• Group consists of 12 core faculty in EE Department,
plus several others in related Departments
Indian Institute of Technology
Bombay
2
Academia Industry Meet 2003, Electrical Engineering Department
Faculty
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P. R. Apte
A. N. Chandorkar
M. P. Desai
S. Duttagupta
R. Lal
S. Mahapatra
B. Gadepally (Adjunct)
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H. Narayanan
R. Parekhji (adjunct)
M. B. Patil
V. Ramgopal Rao
D. K. Sharma
J. Vasi
R. Pinto
Indian Institute of Technology
Bombay
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Academia Industry Meet 2003, Electrical Engineering Department
Associated Faculty
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A. Karandikar
Elec. Engg.
D. Manjunath
Elec. Engg.
S. S. S. P. Rao
Comp. Sci. & Engg.
S. Chakrabarty
Comp. Sci. & Engg.
M. Sohoni
Comp. Sci. & Engg.
S. Patkar
Maths
R. O. Dusane
Met. Eng. & Mat. Sci.
R. Srinivasa
Met. Eng. & Mat. Sci.
A. Contractor
Chemistry
Indian Institute of Technology
Bombay
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Academia Industry Meet 2003, Electrical Engineering Department
Teaching Programs
• Ph.D. (graduating ~ 3-4 / year)
• M.Tech. with specialization in
Microelectronics (~ 35 / year)
• Dual Degree with specialization in
Microelectronics (~ 18 / year)
• B.Tech. (~ 55 / year, ~ 15 / year with
projects in Micro-electronics)
Indian Institute of Technology
Bombay
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Academia Industry Meet 2003, Electrical Engineering Department
Highlights of the Ph.D. Program
• About 15 Ph.D. students at any time
• Institute scholarship, industry fellowship or
sponsored project assistantship
• Typical duration 3 – 5 years
• Industry fellowships from Intel, Siemens, GE
• Most full-time, some part-time
Indian Institute of Technology
Bombay
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Academia Industry Meet 2003, Electrical Engineering Department
Some Recent and Ongoing
Ph. D. Theses
• S. Vaidya: Neutron radiation effects in MOS systems
• J. Meckie: Asynchronous design issues
• G. Trivedi: Parallel algorithms for VLSI optimization
• N. Mahapatra: High-k dielectrics for 100 nm CMOS
• A. Shastry: Microcapillary electrophoresis on silicon
• C.A. Betty: Capacitive immunosensor on porous Si
• B. Anand: Digital design with dynamic threshold CMOS
• D. Nair: Flash memory design and reliability
• D.V.Kumar: Look-up table approach for CMOS circuits
Indian Institute of Technology
Bombay
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Academia Industry Meet 2003, Electrical Engineering Department
Highlights of the M.Tech. Program
• 2 year program with specialization
“Microelectronics”
• Emphasis on both Devices and VLSI Design
• Attracts the top students in the country (GATE
percentile > 99%)
• 35 students admitted every year, including 20
TCS scholars
• 18-month-long M.Tech. project
• Placement in Indian and international
semiconductor and design companies
Indian Institute of Technology
Bombay
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Academia Industry Meet 2003, Electrical Engineering Department
Structure of the M.Tech.
Microelectronics Program
Semester I
Semester II
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• Microelectronics Lab
• M.Tech. Project: Stage I
• Electives II, III, IV (3 out of the
following)
1. System Design
2. Physics of Transistors
3. Analog CMOS design
4. MEMS Technology and design
5. Embedded Systems
6. Hardware test and verification
7. Simulation of circuits and devices
Physical Electronics
VLSI Technology
VLSI Design
VLSI Design Lab
M.Tech. Seminar
Elective I (one of the
following)
1. Foundations of VLSI CAD
2. Hardware Description
languages
3. DSP and Applications
Indian Institute of Technology
Bombay
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Academia Industry Meet 2003, Electrical Engineering Department
Structure of the M.Tech.
Microelectronics Program
Semester IV
Semester III
• M.Tech. Project : Stage II
• M. Tech. Project : Stage III
• Elective V (one out of the
following)
1. Foundations of VLSI CAD
2. Hardware description Languages
3. DSP and Applications
4. Special topics in Microelectronics
5. RF chip design
6. Elective from other departments
Indian Institute of Technology
Bombay
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Academia Industry Meet 2003, Electrical Engineering Department
Highlights of the Dual Degree (DD)
Program
• 5 year program with specialization “Microelectronics”
• Students receive both B.Tech. and M.Tech. degrees at the
end of 5 years
• Entry through JEE, 3rd most popular branch at IIT Bombay
after B.Tech. (CS&E) and B.Tech. (EE)
• Emphasis on both Devices and VLSI Design
• 15 students admitted every year
• Highlight is emphasis on independent study with 18- monthlong DD project
• Placement in Indian and international semiconductor and
design companies as well as for Ph.D.
• First DD batch admitted in 1996 – 7th batch admitted in 2002
Indian Institute of Technology
Bombay
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Academia Industry Meet 2003, Electrical Engineering Department
Structure of the Dual Degree
Program
• I year and II year semesters are identical to the B.Tech. (EE)
programme
• From III year onwards, M.Tech. level courses are introduced
• Many “independent-study” courses like DD Project, DD
Seminar, Miniproject, Lab Techniques, Research Seminar,
etc.
• DD Project starts in 8th semester, and continues through the
10th semester (18 months), including 2 summer sesions
Indian Institute of Technology
Bombay
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Academia Industry Meet 2003, Electrical Engineering Department
Areas of R & D and Student Projects
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VLSI modeling and simulation
VLSI design (digital, analog, mixed-mode)
VLSI CAD tool development
Interaction between VLSI technology and design
Silicon CMOS physics and technology
MEMS
Organic LED’s for display applications
Flexible solar cells
Flash memory: Characterization Analysis,
Reliability Study, Device Scaling.
Indian Institute of Technology
Bombay
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Academia Industry Meet 2003, Electrical Engineering Department
Facilities
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Class 1000 Clean Room
Excellent characterization facility
SEM; photoluminescence
VLSI design workstations
Simulation workstations
Intel Microelectronics Lab
TCS VLSI Design Lab
Wadhwani Electronics Laboratory
Indian Institute of Technology
Bombay
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Academia Industry Meet 2003, Electrical Engineering Department
Collaborations
• Industry sponsorship of Ph.D., M.Tech. and DD
students: TCS, Intel, TII, Sasken, Analog, Cypress,
Siemens, GE, IME, etc.
• Research Projects with Indian industry: BEL, ITI,
Sasken, TII, Cypress, ControlNet, etc
• Research Projects with international industry: Intel,
Motorola, GE, Siemens, National, IME, Agere, Hitachi,
IBM
• Government Agencies: DST, ISRO, NPSM (National
Programme on Smart Materials), MHRD, NRB
Indian Institute of Technology
Bombay
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Academia Industry Meet 2003, Electrical Engineering Department
University Collaborations
• Collaborations with other IITs, Universities of
Bombay, Pune
• Collaborations with International universities
like
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UCLA, UCSB, Yale University (USA)
Hong Kong University of Science & Tech. (HK)
Delft University (The Netherlands)
University of Bundeswehr (Germany)
Griffith University (Australia)
NTU, NUS (Singapore)
Indian Institute of Technology
Bombay
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Academia Industry Meet 2003, Electrical Engineering Department
Conclusions
• Most active Microelectronics & VLSI group in India
• Major teaching programs at all levels
• 110 – 120 graduate students resident in
Microelectronics and VLSI group at any time
• 35 M.Tech, 18 DD and 3 Ph.D. students graduating
every year
• Excellent teaching & research facilities
• Student project sponsorships from Indian &
international industry
Indian Institute of Technology
Bombay
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Academia Industry Meet 2003, Electrical Engineering Department
Contacts
• Microelectronics Group
Department of Electrical Engineering
Indian Institute of Technology, Bombay
Powai
Mumbai 400076 India
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Phone:
Fax:
email:
website:
+91-22-2572-4482
+91-22-2572-3707
[email protected]
www.iitb.ac.in/~microel/
Indian Institute of Technology
Bombay
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SEQUEL: A Solver for circuit EQuations
with User-defined ELements
Prof. Mahesh B. Patil
www.ee.ittb.ac.in/faculty/mbp/sequel1.html
Indian Institute of Technology
Bombay
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Academia Industry Meet 2003, Electrical Engineering Department
SEQUEL: Features
• Allows user-defined elements
• DC, transient, small-signal, noise
• Mixed-signal simulation
• Electrothermal simulation
• Sensitivity analysis (exact)
• Switched capacitor circuits
• Efficient “steady-state waveform” computation
• Perfectly “general” elements are possible
(mechanical, thermal etc)
Continued
Indian Institute of Technology
Bombay
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Academia Industry Meet 2003, Electrical Engineering Department
Collaboration based on SEQUEL
• DST (Circuit Simulation using the LUT
approach)
• PEPS group at IIT Bombay
• IISc Bangalore (Power electronics text book)
• Department of BME, IIT Bombay
• Intel (study of NQS effects in MOS transistors)
• IME (Circuit simulation using experimentally
extracted tables)
Indian Institute of Technology
Bombay
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Fast Circuit Simulators at IIT Bombay
Prof. H.Narayanan
[email protected]
Indian Institute of Technology
Bombay
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Academia Industry Meet 2003, Electrical Engineering Department
BREMICS (1986, 87, 90) for analog simulation of networks
arising out of digital circuits (MOS transistors, resistors,
capacitors)
• could handle 1000 nodes, 2000 edges. For the restricted class
much faster (5 to 10 times) than SPICE on PCs.
• BITSIM (1991-92) general purpose (SPICE like) simulator
based on conjugate gradient method for solution of linear
equations and the hybrid analysis for writing equations.
Could handle 3000-4000 nodes, 8000 edges originally on
SUN, now on Pentiums. Work done through several B.Tech
and M.Tech. projects and through a research engineer (Dr.
Subir Roy)
Indian Institute of Technology
Bombay
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Academia Industry Meet 2003, Electrical Engineering Department
Currently “Large Circuit Simulations” by
Parallelization is actively pursued
The innermost subroutine of a general purpose
simulator is a DC circuit analyzer (voltage sources,
current sources, resistors, controlled sources)
We parallelize this by the
“Multiport Decomposition Method”
Our simulator can currently solve
700,000 nodes, 1.4 million edges dc circuit in about 5
minutes using 5 processors (Pentium IV ‘s) connected
through a 100 MBPS link
Indian Institute of Technology
Bombay
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Academia Industry Meet 2003, Electrical Engineering Department
Application of large dc circuit analyzer
1) The Multi port Reduction Problem
100,000
RC
Elements
Few
terminals
Same
terminal
behaviour
Same
terminal
behaviour
1000
RC
Elements
arises while modelling “short circuits” in
chips at high frequency
Indian Institute of Technology
Bombay
Continued
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Academia Industry Meet 2003, Electrical Engineering Department
we have constructed a few such reduction algorithms and
implemented them. e.g. SARN reduces RC circuit with
100,000 nodes 200,000 edges 50 terminals in ½ hour to 1000
node circuit with 50 terminals.
2) Solving a large Combinational optimization problems
a) Network flow problems
b) Minimum cost flow problems
Both of these can be posed as nonlinear static circuit analysis
problems
Innermost subroutine is a DC analyzer.
Continued
Indian Institute of Technology
Bombay
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Academia Industry Meet 2003, Electrical Engineering Department
3) Parallelizing large Sparse linear equations
The equations are made to appear like those
of a dc circuit and then given to the dc
analyzer to solve by
“Multi port Decomposition”.
Indian Institute of Technology
Bombay
27
Mixed Signal CMOS Device Design
and Optimization for Bulk and
SOI Technologies
V. Ramgopal Rao
[email protected]
Academia Industry Meet 2003, Electrical Engineering Department
Outline
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Scaling CMOS-Analog Performance
Device Engineering-Bulk&SOI
Process Development-Bulk&SOI
LAC-Bulk Analog Performance
LAC-SOI Analog Performance
 Floating Body Effects-Channel Engineering
Circuit Implications-LAC Technologies
Hot Carrier Reliability
Indian Institute of Technology
Bombay
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Academia Industry Meet 2002, Electrical Engineering Department
ANALOG AND RF DESIGN
Prof. D. K. Sharma
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Data Converters (DKS/ANC/MPD)
Low Voltage/Low Power Design (ANC/DKS)
RF Transmitters and Receivers (ANC/DKS)
PLL and DLL circuits (ANC)
Broadband Communications related
circuits (ANC/DKS)
• Modeling and Simulation for RF, Analog
(JV/MBP)
Indian Institute of Technology
Bombay
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