Coils loose frequency haen pendent network

摘要

The frequency-denepdent network, for giving freq.-dependent transfer characteristics, consists of resistors, capacitors, amplifiers and frequency-dependent negative resistors but no inductors or coils, and is equivalent to an LC network. The frequency-dependent negative resistance is connected in series with, and between two impedance converters. Each impedance converter has a voltage transfer ratio of unity, and a current transfer ratio such that when the two converters are in series the ratio is also unity. Each converter consists of two operational amplifiers cross-coupled to a chain of impedances.