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Design of Switched-Capacitor Ladder Filters
Published in John T. Taylor, Qiuting Huang, CRC Handbook of ELECTRICAL FILTERS, 2020
There are two general approaches for designing active filters based on LCR ladder prototypes. The first is inductor replacement using an impedance transformation device of which the gyrator and negative impedance converter (NIC) are perhaps the best-known examples.8 The second method simulates the electrical terminal properties of the elements of the prototype, which for this purpose is usually represented by its signal flow graph (SFG). Although both methods have been employed successfully in the design of practical active RC filters,8,9 in practice only the ladder simulation method is frequently used in the design of SC filters. This is because it is very difficult to design a suitable impedance transformer which can be made insensitive to parasitic capacitance (stray-free). Since we wish to scale the components in the integrated realization to minimize die size while at the same time preserving a high level of transfer function accuracy, insensitivity to parasitic capacitance is clearly crucial. In fact, this requirement tends to dominate practical SC filter design, since only a fairly small subset of SC subcircuits can be made entirely stray-free.2,3
Experimental investigation on the hysteretic dynamics of a regenerative hybrid electrodynamic cable damper
Published in Structure and Infrastructure Engineering, 2022
Seungkyung Kye, Hoyeon Jung, Hyung-Jo Jung
Electromagnetic dampers are coupled with tuned mass dampers or inerter dampers, which are used to implement behaviors in damping to complement features that provide structural rigidity and safety. Li, Zhu, Shi, and Shen (2020) verified the structural performance experimentally by applying a capacitor-based shunt circuit and a negative impedance converter with voltage inversion to an electromagnetic device mounted on a full-scale cable. The results showed that the motor constant and damping-force level of the proposed system are sufficient for application to a full-scale target structure. A maximum damping ratio of 8% was found in the fundamental mode in the system applying the motor’s gearbox and ball screw.