Transcript Programmable Biquads presentation by Prof. T. S. Rathore EE Dept

Experiences as a Self-Motivated Researcher
Dr T S Rathore, F IETE, F IE, M ISTE
Department of Electrical Engineering
Indian Institute of Technology, Bombay
Powai, Mumbai 400 076
email: [email protected]
Website: www.ee.iitb.ac.in\~tsrathor
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Requirements for doing research
1. Zeal – Where there is will there is a way
2. Regular reading of research journals
- Library habit
- Membership of Professional bodies
3. Topic of research
- Scan a few issues
- Papers of interest
- In-depth studies of the papers
- Literature survey
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Learning
- Copying – A child is the father of the man
- Chess Player
- Copying + Originality
Practice
Practice makes a man perfect
• Read several times
• Close the book after reading
Practicing
- Write the abstract / summary
- Do derivations
- Solve some problems
Creative thinking
- Can you rewrite the chapter
- Can you think of alternative approach / derivation
- Can you add a problem
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- Can you write a chapter for a book
• Don’t confine to the Book Material
• Read current research papers
• Don’t go for research in outdated
areas but do read them and get
ideas.
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• Ask Questions?
• - Why this way?
• - Why this assumption?
Its effect on the result.
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Reading a few initial pages of the
book, you should predict logically
what is next in your opinion by
stretching your imagination.
Z, Y parameters.
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Network transformation
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Complementary transformation
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Inverse transformation
• oE
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6 different functions
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Network transformations by switching
Inv. Amplifier
Non-inv. Amplifier
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Inv. Integrator
Inv. Differentiator
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Papers published:
1. An active network transformation, IETE(I) J of Research, 1978.
2. Inverse complementary network theorem, IEEE Proc., 1978
3. Generation of transfer function realizations employing inverse
active network theorem, IETE(I) J of Research, 1978.
4. Network transformations, IEEE Trans. Circuits & Syst., 1980.
5. Complementary networks and their applications in filter
design, IETE Annual Convention, 1980.
6. Active complementary networks, IETE(I) J of Research, 1980.
7. Active complementary networks, IEEE Trans. Circuits & Syst.,
1980.
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RDS circuit
2n states. Whereas maximum possible states are
2n only.
Is it not possible in the beginning to find what
states exist and in which order.
We developed a procedure such that it
automatically gives what will be the next state.
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Assumed Diode Method
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Break Point Method
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Sequential Break Point Method
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Case I – L and R complementary
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Case II – L and R Non-complementary
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DACs – Why two types only
- Optimize the spread and minimum
total resistance.
• Types of DACs
- Weighted Resistor
- R - 2R Ladder
- Why not more types?
- Why not multistages?
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THANK YOU
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