This chapter contains a collection of miscellaneous topics that are elementary to active filter studies. Some commonly used notations and terminology are defined and they will be used in active filters. Some of the basic ideas, definitions, circuits, and formulas will be used at various points in the development of active filters in subsequent chapters. Other topics, such as transmission zeros and gain adjustments, are common to many active filters and it’s expedient for them to be treated together at the outset. These topics are brought together here to enable a smoother and more coherent presentation of the next four chapters.
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