Fundamentals of Electronics: Book 1: Electronic Devices and Circuit Applications by Ernest M. Kim
It is expected that the reader of this text is familiar with the common passive elements of linear circuit analysis (resistors, inductors, capacitors, and transformers) as well as the idealized linear active elements (independent and dependent voltage and current sources). Unfortunately, the field of electronics makes great use of active elements that do not necessarily fall into either of the above categories. These active elements may behave in either a linear or non-linear fashion depending on their circuit application. Thee study of electronic circuit behavior traditionally begins with three active semiconductor electronic elements:
• The Semiconductor Diode
• The Bipolar Junction Transistor (BJT)
• The Field Effect Transistor (FET) To this trio of fundamental devices has been added an additional electronic circuit building block, the Operational Amplifier (OpAmp).
While the OpAmp is composed of tens of transistors (usually either BJTs or FETs, but sometimes a mixture of both types) and often a few diodes, its easily understood terminal properties, high use in industry, and commercial availability make it a good companion for study with the other devices. Quasistatic analysis explores the potentially non-linear action of each of these four elements (or any other similar element) in a variety of applications. e fundamental assumption in this exploration is that voltage and current transitions take place slowly and that the circuit is always in equilibrium: hence the term quasistatic. e authors have chosen to begin the study of electronics with a chapter on the operational amplifier for several reasons, among which are:
• in most simple applications, the OpAmp behaves in a near-ideal fashion.
• typical analysis of OpAmp circuitry provides a good review of basic circuit analysis techniques.
• discussion of the OpAmp provides a good framework for understanding of electronic circuitry. While many readers will find much in this chapter on OpAmps a review, the chapter presents several concepts fundamental to the study of electronic circuitry. Most significant among these concepts are:
• undistorted amplification • gain • device modeling • conditions under which device models, particularly linear models, fail
Of particular importance is the concept that a device with extremely complex interior working mechanisms can be modeled simply by its terminal characteristics. e remaining three chapters in this book present the semiconductor diode, the BJT and the FET. Each chapter follows the same basic framework and has the same goals:
• To present each device through real experimental data and through theoretical functional relationships.
• To use the above presented relationships to observe the action of the device in relatively simple circuits.
• To devise a progression of realistic piecewise-linear models for the devices.
The theoretical basis for each model is presented and the appropriate use of these models is explored. Only when a model fails to properly predict device behavior will new, more complex, models be introduced. This simple-to-complex route provides for progressively more detailed analysis using the newly introduced models.
• To use realistic applications to demonstrate the usefulness of the device models.
• To provide a solid foundation for the linear and non-linear modeling and applications found in later books of this series.
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