Analog VLSI Design

ABOUT THE COURSE:This course is aimed at introducing analog circuits from the perspective of designing amplifiers in an integrated circuit using MOS transistors. The students will be introduced to the techniques required for designing amplifiers using negative feedback as the guiding principle. Small signal characteristics of widely used amplifier topologies will be discussed and their limitations analysed. The learning objective of the course is to make the students proficient in the synthesis basic amplifier topologies so that one can develop an intuition to design circuits based on specific requirements in their career.INTENDED AUDIENCE: 3rd 4th year UGs or first year PGsPREREQUISITES: Suitable for 3rd year B.Tech and 1st year M.Tech/MS/Ph.D students. Expected knowledge of: Network theory, Laplace transform, Sinusoidal state analysisINDUSTRY SUPPORT: Semiconductor circuit design companies like, Qualcomm, Texas Instruments, Maxlinear, Samsung, Aura Semiconductor, Silicon Labs and many more

Week 1 & 2 : Introduction: Linearization of non-linear elements, Generation of small incremental linear equivalents from non-linear elements.Week 3 & 4 :Basic amplifier design using MOSFET. Common source amplifier with resistive load.Biasing a common source amplifier. Gain limitations of the configuration.Introduction to swing limits. Relevance of the limitations in a integrated circuit.Week 5 & 6 :Different biasing techniques of a common source amplifier. Use of negative feedback to realize stable biasing. Distinction between constant voltage and constant current biasing.Week 7 & 8 :Introduction to controlled sources. Realizing controlled sources using a voltage controlled current source. Using MOSFETs to realize the controlled sources and other amplifier configurations. Body effects in an MOSFET. The effect of output resistance of a MOSFET on an amplifier configuration.Week 9 & 10 :Introduction to active loads, and single stage differential amplifiers. Analysis of gain,swing limits, slew rate, common mode rejection ratio, power supply rejection ratio in a single stage differential amplifier.Week 11 & 12 :Multi-stage amplifiers using controlled sources. Introduction of stability parameters of multistage amplifier when configured in negative feedback. Design and analysis of multi-stage amplifier by replacing the controlled sources with MOSFETs.