Passive and active filters : theory and implementations / Wai-Kai Chen. Chen, Wai-Kai, 1936- Electric filters, Active. Electric filters, Passive. Analog electronic systems. TK7872.F5 C469 1986 621.3815324 19 CHP Includes bibliographical references and index. New York : Wiley, c1986. c1986. 1986 Text xiv, 504 p. : eng