Switchable filter circuits

Details Switchable filter circuits Switchable filter circuits

H - Electricity

03

H

333/72

H03H 7/01 (2006.01) H03H 9/46 (2006.01) H03H 11/04 (2006.01)

Patent

CA 1162994

ABSTRACT A switchable filter circuit for use in a receiver to select a first or a second frequency band from a received signal and for providing predetermined minimum stop band attenuation at frequencies outside the selected frequency band, the second frequency band lying wholly within the first. A first filter element is provided which defines a primary pass band corresponding to the first frequency band, and a second filter element is provided which defines a secondary pass band corresponding to the second frequency band, the first filter element having an input to which the received signal is applied, and the second filter element having an input for receiving the output of the first filter element. The stop band attenua- tion of the first filter element is at least as greater as the predetermined minimum stop band attenuation required, and the stop band attenuation of the secondary filter element within the primary pass band being that which is required by the application. Thus the first filter element significantly determines the stop band characteristics of the filter circuit as a whole outside the primary pass band.

375538

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