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Dr. Subhajit Sen
Subhajit Sen
Associate Professor,
Contact: Room 212-A, IIIT-B,Electronic City, Bangalore
E-mail:, Phone: 91-80-4140-7777 (Extension 161)

I work (and teach) in the area of analog and mixed-signal interface and power management circuits using both microelectronic(VLSI) IC, nanoelectronic and COTS technologies. Why analog? The physical world is observable (and controllable) only as analog signals: be they weak signals at the input of wireless receivers or the high-power outputs of motor-controllers. Even digital logic signals transmitted in any band-limited medium have to be treated as analog signals before they can be recovered without error. Furthermore, it has been well established that the neurons in the human brain process information in analog form (that can be mimicked by transistors) with orders of magnitude higher efficiency in power as compared to digital computer circuit based algorithms: a computing paradigm known as neuromorphic processing. Therefore the fundamental importance of analog signal processing will never go away.

However, a curious and perhaps surprising reality for a practitioner of the analog art is as follows: because of the ubiquity of digital communication and signal processing, it is not enough to know how to process and signal-condition raw analog signals i.e. know how to amplify, filter, mix up or down, add/subtract analog signals. One must also be able to present the signal in digital format to a computer and conversely convert it back to the analog domain in a secure manner. The latter is accomplished using data-converters (A/D and D/A) and phase-locked-loops that are an important component of modern circuit research. 

The field of CMOS VLSI analog & RF integrated circuits has been made possible by the pioneering work of Profs. Paul Gray and  Robert Meyer and many of their students at UC Berkeley as well as in companies in Silicon Valley and elsewhere(Canada and Europe). Much of modern embedded electronics would not have been possible without their key contributions. Other pioneers in low-power VLSI are Prof. Eric Vittoz(ETH) and Carver Mead(Caltech). Important recent contributions have come from Profs. Behzad Razavi.

Teaching: I teach or have taught the following courses/labs:

Analog Circuits,

Analog CMOS Integrated Circuits,

Advanced Analog CMOS Integrated Circuits

Mixed-Signal Design

VLSI Subsystems,


Research Interests

Analog and RF microelectronic circuits: Current focus is on SAR & cyclic/algorithmic converters

and calibration methods

Organic-polymer Thin Film Transistor circuits grown on flexible substrates

Power Management & Energy Harvesting circuits: Current focus on Switched-Capacitor DC-DC Converters

Bio-medical Electronics: ECG, EMG, pulse-oxymetry and USG.


Ultrasonic Applications

Sponsored Research




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