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Filters
Published in Geoff Lewis, Communications Technology Handbook, 2013
Gyrator circuit. The circuit shown in Fig. 13.11 is a useful element of filter construction. It is a non-reciprocal two-port circuit with an input impedance Zi proportional to the reciprocal of the load impedance ZL and Zi = R2/ZL, where R is described as the gyration resistance. Thus if the load is a capacitor, the input terminals will appear as an equivalent inductor. Inductors with values up to 1 henry and Q factors up to 1000 can be produced in this way.
Resonant inductive-coupling configurations with load-independent transfer-parameters for wireless power transfer – a perspective from the transformer equivalent-models
Published in EPE Journal, 2018
In the designation of these configurations, the first character indicates the side of the transformer that has the capacitor (‘1’: primary, ‘2’: secondary); the second character indicates the type of capacitor connection (‘S’: series, ‘P’: parallel). In the models associated with the 1S and 1P configurations, LB was reflected to the primary, for easing the determination of Zi. In the case of the models based on the ideal gyrator (Figures 7(b) and (d)), note that LB was reflected as an equivalent capacitor CB. Specifically, the ideal gyrator reflects an inductance as a negative inductance –L, which is equivalent to a frequency-dependent capacitance C, according to (7). Under this condition, both –L and C correspond to an impedance –j.ω.L.
Active tuning of flexural wave in periodic steel-concrete composite beam with shunted cement-based piezoelectric patches
Published in Mechanics of Advanced Materials and Structures, 2022
Lili Yuan, Zhanhua Cai, Peng Zhao, Jianke Du, Tingfeng Ma, Ji Wang
A negative impedance synthetic circuit, i.e., gyrator circuit, is used to generate the negative capacitance. The circuit includes a capacitor, resistors, and an operational amplifier as shown in Figure 3. The equivalent shunt capacitance is