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  • Newsletter of Foundation for Innovation and Technology Transfer,Indian Institute of Technology, Delhi

    C O N T E N T SInvited Articles.........................................................................................................................3

    Voices........................................................................................................................................6

    Faculty Profile..........................................................................................................................8

    IIT Delhi News.........................................................................................................................11

    Technology Profile...........................................................................................................12

    Miscellaneous......................................................................................................................1 3

    IPR...................................................................................................................................................14

    Professional Development.......................................................................................15

    Projects.......................................................................................................................................16

    I S S N - 0 9 7 2 - 2 5 4 8

    Vol. 16 No. 2 July-August 2010

    The Golden Jubilee Logo consists of four parts, namely a timeline foundation, the iconic roof of the Dogra Hall, a pair of crystal wings andthe rising arc of organic knowledge.

    FITT Forum Newsletter-July 2010.pmd 8/13/2010, 4:41 PM1

  • Foundation for Innovation and Technology Transfer Forum - August 2010

    Waka Waka.... The just concluded 2010 FIFAWorld Cup defied the Pundits and Punters; wentalong with Paul the octopuss predictions, threwup surprises but, did not fail to show up ruggeddetermination, enthusiasm and all-around passionin the scintillating game of soccer. It was a rollingevent. The same passion and enthusiasm has playedout at IIT Delhi for the past 49 years ! Yes, we areentering the Golden Jubilee Year from August10.And this is only a milestone in our long and high-standards journey of academic pursuits.Fortunately, the journey has not been solo orisolationist. It has been an over-arching evolutionthat, in its wake, has created an ecosystem ofexcellence in learning and development. Amongstits various program manifestations has been thecreation of Foundation for Innovation andTechnology Transfer (FITT) - an organisation meantto strengthen the Institutes outreach to businessand the community through its various activitiesand programs drawing on the intellectual andinfrastructural strengths of IIT Delhi. We inviteyou to join us in our endeavour towards still higheraccomplishments for the Institute which has justunveiled it's beautiful Golden Jubilee Logo as seenon the cover page.

    The financial year end 2010 for FITT was yetanother period of growth and consolidation. Thenumbers were better off than in the previousyears, contributed in part by our increasedattention towards International projects thatinvolve a consortium approach to research anddevelopment. However, as always, we bet onrelating with the business towards knowledgetransfer. We believe this is an effective mechanismfor technological intervention. The increasedthrust towards professional developmentprograms primarily aimed at the industrysegment continues. Technology commercializationthrough licensing and techno-entrepreneurshipparticularly through the incubation routecontinue to be our flagship verticals. Theseprograms have also acquired wider dimensionsof leveraging the various open innovationplatforms supported by the Government entitieseg DIT, DSIR, MSME and TIFAC. Three of ourpromising TBIU start-ups exited for scale-up andregular commercial operations. We are on thetrack of strengthening our techno-entrepreneurshipprogram at IIT Delhi and trying to come up tothe potential and expectations. Our hard workcontinues !

    The Golden Jubilee Year

    Anil Wali

    Entrepreneurial and Managerial Development (MSME) - to nurture /promote technology / knowledge - based innovative ventures throughfinancial / incubation support (www.msme.gov.in)

    Innovation Support under TePP (DSIR) - to enable innovators to becometechnology entrepreneurs through financial support / mentoring upto Rs15 / 45 lakh (www.dsir.org)

    FITT organised the celebration of the National Technology Day at IIT Delhi

    on May 12, 2010. On this occasion, a thematic seminar Incubating Technology

    Solutions was held at the Senate Room of the Institute. The speakers on the

    occasion comprised of Prof. KR Rajagopal (Dept. Electrical Engg., IIT Delhi and

    promoter of TBIU Start-up Global Motor Tech Pvt Ltd), Dr. Aaditeshwar Seth

    (Deptt. Computer Science & Engg and promoter of TBIU Start-up Gram Vaani

    Community Media Pvt. Ltd.), Shri. Ravi Kapoor (Promoter : Faros Technologies

    Pvt. Ltd) and Sh. Dipinder Sekhon (of Kritikal Solutions Pvt. Ltd). The programme

    was inaugurated by Prof S Prasad, Director, IIT Delhi and was attended by

    several senior faculty members, students and some members of the industry. The

    four presentations during the seminar highlighted the respective backgrounds,

    development challenges, strategies and successes in technology venturing at the

    TBIU in IIT Delhi.

    National Technology Day

    FITT extends followingsupports under approvedGovernment Schemes

    02

    FITT Forum Newsletter-July 2010.pmd 8/13/2010, 4:41 PM2

  • Foundation for Innovation and Technology Transfer Forum - August 2010

    Hitesh Shrimali,Shouri Chatterjee

    11 GHz UGBW OPAMP with Feed-ForwardCompensation Technique

    Fig. 2. Transistor level implementation

    AbstractA high speed pseudo differential three stageoperational amplifier has been implemented using a feed-forwardcompensation technique in a standard 0.13 m CMOS technology.The three stage inverter based opamp with feed-forwardcompensation achieves 11 GHz of unity gain bandwidth andexhibits 39.5 dB of DC gain with phase margin of 62 when drivinga differential load of (2300 fF). The proposed opamp achieves afigure of merit (FOM) of 440 [1] and in simulation, the overallcircuit consumes 18 mw of power.

    1. IntroductionAn operational amplifier is a key building block in analog

    circuit design. For maximum bandwidth, minimum length devicesoffer the maximum advantages as these have maximum fT . Atypical 0.13 m CMOS device has an intrinsic gm rds of 8 forminimum channel length because of short channel effects. Thislimits the maximum gain of a typical two stage opamp design toless than 36 dB. This is unacceptable for high performance designs.One can opt to use a cross-coupled pair to improve the gain,however this kind of gain enhancement is uncontrolled. One canuse a folded cascode amplifier to achieve higher gain; however,this limits the output swing of the first stage of the amplifier andcreates difficulties in biasing at low power supply voltages.

    A traditional three stage amplifier achieves higher gain thana two stage amplifier, but has limited bandwidth. Differentfrequency compensation techniques have been reported for threestage operational amplifiers. In the proposed design, a feed-forward compensation technique [2] has been utilized to stabilizea three stage operational amplier without sacricing bandwidth.

    2. DesignFig. 1 shows the block-diagram of a three stage operational

    amplifier with feed-forward compensation. For easy analysis, a singleended design is shown. A feed-forward compensation technique hasbeen used to stabilize the three stage operational amplifier. The threestage cascaded amplifier on path A provides a gain of A3 V at

    low frequency.At highfrequencies ,since path B isfaster, theamplifier willtypically have again of onlyAV f . At thesame time, tofirst order, the

    gain bandwidth product will be given by AV f times the bandwidth ofpath B. A class AB based push pull amplifier has been used to implementeach of the single stage amplifiers.

    Fig. 2 showsthe transistorl e v e limplementationof the pseudod i f f e r e n t i a lo p e r a t i o n a lamplifier. Thecascaded stageson path A aremade identical.The aspect ratio of the forward path transistors have been chosensuch that the desired phase margin is obtained.

    The three stage operational amplifier with pseudo differentialtopology gives a common mode gain which is the same as thedifferential gain. The common-mode gain is negative. As a result,when the opamp is used under negative feedback conditions, thecommon-mode voltage will automatically stabilize and noadditional common-mode feedback loop is necessary. A small-signal low frequency voltage gain of the three stage operationalamplifier is shown in equation 1

    AV = GmR( + G2mR2)1 + (1)

    where Gm = gmn + gmp, R = rdsnjjrdsp and is defined as the ratioof an aspect ratio of the path A to the path B. The feed-forward pathadds a pair of complex and conjugate zeros in the amplifier transferfunction in order to stabilize the 3-stage operational amplifier.

    3. Simulation ResultsFig. 3 shows the magnitude and phase plot of an operational

    amplifier. The magnitude plot shows 39 dB of gain with11 GHzunity gain bandwidth and the phase plot shows a phase marginof 62 when driving a differential load capacitance of 300 fF. The gain

    Fig. 1. Block diagram of proposed 3-stage operationalamplifier with feedforward compensation Fig. 3. Magnitude and phase plot

    03Invited Articles

    FITT Forum Newsletter-July 2010.pmd 8/13/2010, 4:41 PM3

  • Foundation for Innovation and Technology Transfer Forum - August 2010

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