Abstract
Inductorless active filters using piezoelectric resonators are described. Because of the excellent frequency stability of piezoelectric resonators (quartz crystals in particular), these filters are more suitable for realizing narrow bandwidth responses than are active RC filters which are restricted to relatively low Q applications by the limited tracking capability of the RC components. In addition, because the filters are active, the inductors and transformers which are often required in passive piezoelectric filters are eliminated.
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