Analog filters are commonly used in areas such as communications, control and signal processing, and engineers and students in such areas require an understanding of basic filter theory. Some existing books on filters design are written from the perspective of network theorists and fail to address the needs of those wishing to design and apply filters in electronic systems. This book is designed for advanced students and engineers who need to use analog filters. It introduces the theory behind filter development and the design techniques commonly used in practice, including the application of standard software packages.