Title: Digitally tuned circuit including switching of bank capacitors between plural tuned circuits

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Abstract: An electrically tuned filter arrangement including several tuned filters which may alternatively be coupled to the input and output of the filter arrangement so as to provide the arrangement with different tuning ranges. Each tuned filter has a tuning input to which a capacitive impedance is to be connected for establishing the center tuning frequency of the filter. A capacitor bank is provided including plural individual capacitor elements, and means for coupling any selected combination of the capacitor elements to a capacitive impedance output. This capacitive impedance output is switchably connectable to the tuning inputs of any of the tuned filters. A filter control circuit is provided which responds to a frequency selection signal to automatically connect the appropriate tuned filter to the input and output of the filter arrangement, to couple the capacitive impedance output of the capacitor bank to the tuning input of the tuned filter thus selected, and to cause an appropriate combination of capacitor elements to be coupled to the capacitive impedance output. The filter arrangement is thus automatically tuned to the frequency indicated by the frequency selection signal.


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