Solid-State Circuits Group (SSCG), IITG

Solid-State Circuits Seminar Series

Circuits and systems for sub-uW energy harvesting

    Abstract:

    Deployment of wireless sensor networks requires periodic battery replacement of all the sensor nodes. If possible, with energy harvesting from ambient sources, battery replacement will not be needed, and the maintenance cost of a wireless sensor network, or a body-area network, may be reduced significantly. Ambient sources for energy harvesting include ambient sound or vibrations, indoor light, and RF radiation. The available power in ambient RF sources, in ambient vibrations, and in ambient light is only as large as 2 uW for a 1 cm^2 transducer, and typically the voltage output of the transducer is very small. Integrated circuits typically require more than 1 V supply voltage for reliable operation, and therefore there is a need for high-performance DC-DC converters for voltage boosting. In this talk, circuits and systems for sub-uW energy harvesting will be discussed.

    Date, Time and Venue:

    At 11 am on Oct. 26, 2017, in EEE Seminar room, IIT Guwahati.

    About the speaker:

    Dr. Gajendranath Chowdary is a faculty in the department of EE, IIT Hyderabad. He received the B.E. degree from Osmania University Hyderabad, India, in 2006. He obtained the M.Tech and Ph.D. from the Indian Institute of Technology, Delhi, India, in 2008 and 2016 respectively. He worked as an analog circuit design engineer for mobile handsets with ST-Ericsson from 2008 to 2010 and with Aura Semiconductor during 2011, 2013 and 2016. His research interests include analog and mixed-signal circuit design for ultra-low-power applications.

Oscillators and their analysis

    Abstract:

    Oscillators are nonlinear systems with a periodic steady state. They are usually treated as linear periodically time-varying systems for the sake of analysis. In this talk, we will look at oscillators, their treatment as LPTV systems for analyzing their phase noise through the impulse sensitivity function. We will look at the fundamental phase noise limits in LC and ring oscillators. We will also discuss the interesting phenomenon of injection locking in oscillators.

    Date, Time and Venue:

    At 2 pm on Oct. 26, 2017, in EEE Seminar room, IIT Guwahati.

    About the speaker:

    Nagendra Krishnapura received the B.Tech. degree from IIT Madras, Chennai, India, and the Ph.D. degree from Columbia University, New York, NY, USA. He was an Analog Design Engineer with Celilght Inc., Iselin, NJ, USA, Multilink, Somerset, NJ, USA, and Vitesse semiconductor, Somerset, NJ, USA. He was an Adjunct Faculty in Analog Circuit Design with Columbia University. He is currently an Associate Professor with IIT Madras. His current research interests include analog and RF circuit design and analog signal processing.