Zen of Analog Circuit Design

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About Zen Of Analog Circuit Design

Zen of Analog Circuit Design RECENTLY UPDATED WITH NEW CONTENTFrom 2011 till 2013, I taught a course titled Analog Design for all which covered concepts starting with MOS transistors and progressed till the design of two-stage amplifiers. The course introduced concepts in a manner that led the student to the synthesis of new circuits, not merely their analysis. But I still felt that there was a more intuitive way to introduce Analog Circuit Design, one that would bring out the beauty of the subject so that the student could ‘stop and smell the roses’. But why a ‘Zen of Analog’…?Because the foundational concepts in Analog closely mirror human relationships! The purpose of this book is to take a simplified and intuitive path to unlock some profound secrets of Analog. The protagonist of this book is Ang-Lao, a medieval monk who brings his insights into the Analog world to solve the challenges in human relationships.The book addresses a problem statement that much of Analog Circuit Design tries to solve - how do you realize an ideal buffer? It starts with the simple concepts of voltage sources and current sources. From the I-V curve of the MOS transistor, we see how it behaves much like a Voltage controlled current source (VCCS). The inherent challenge in getting even a simple two-transistor circuit to work is the conflict arising from having two such current source-like elements in series. The digital inverter is shown to be one such circuit that can function like an analog amplifier, albeit over a narrow range of input voltage. The effect of loading on such a circuit is illustrated graphically and is shown as an added challenge in getting it to work in an analog manner. Having understood the complications involved, we see how through the strikingly simple but immensely powerful concept of feedback, one of the two transistors can be