Electronic Devices and Circuits Dr. Aditya Sankar Medury adityam[AT]iiserb.ac.in Integrated Circuits are ubiquitous in today’s world being used in most modern electronic systems such as in cell phones, personal computers , printers, set-top boxes etc.. Most of these integrated circuit chips are digital in nature but there is also a significant presence of analog circuitry. Good system design requires a strong emphasis on circuit design, which in turn relies on high reliability of operation and a proper balance between power consumption, timing and area. Circuits must also be designed so as to operate properly over a wide-range of process variations, supply fluctuations and changes in the environmental conditions. The ability to design circuits thus has to be necessarily based on a solid understanding of the physical principles and working of transistors (VLSI Devices) which constitute modern integrated circuits. An understanding of these aspects and a sound understanding of how the device operates under different conditions enables the device designer to effectively design the device so as to meet circuit design requirements. Since the 1980’s, complementary MOS (Metal-oxide-semiconductor) has become the dominant technology used in circuit design due to its low power characteristics. The semiconductor industry has thus far primarily been based on silicon as a channel material. However, in the current era of nanoelectronics, the limits of scaling silicon to ultra-thin dimensions has brought a new set of challenges in terms of fabrication and new physics seen at these dimensions. Thus, other new channel materials such as III-V semiconductors, novel 2-D materials are also being actively pursued as alternatives to silicon so as to enable better device design eventually translating to better circuit design.