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Gyrator
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==Impedance inversion== In [[microwave]] circuits, impedance inversion can be achieved using a [[quarter-wave impedance transformer]] instead of a gyrator. The quarter-wave transformer is a passive device and is far simpler to build than a gyrator. Unlike the gyrator, the transformer is a reciprocal component. The transformer is an example of a [[distributed-element circuit]].<ref>Matthaei, George L.; Young, Leo and Jones, E. M. T. ''Microwave Filters, Impedance-Matching Networks, and Coupling Structures'', pp. 434-440, McGraw-Hill 1964 (1980 edition is {{ISBN|0-89006-099-1}}).</ref>
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