H - Electricity – 03 – H
Patent
H - Electricity
03
H
328/0.4
H03H 15/00 (2006.01) H03H 7/01 (2006.01) H03H 15/02 (2006.01)
Patent
CA 1105572
ABSTRACT OF THE DISCLOSURE Disclosed is a frequency converting filter comprised of a charge transfer device transversal filter and a non-sampling filter. The transversal filter has an output lead coupled to an input of the non-sampling filter, and has frequency passbands of width .DELTA.f centered at the fixed frequencies nfs ? fo where n is an integer multiple of the sampling frequency, fs is the sampling frequency, and fo is the center frequency removed from the sampling frequency of the desired frequency passband. The non-sampling filter has a single passband. The single passband has a width of less than fs - fo - .DELTA.f/2 and it is centered to include only a selected one of the passbands of the transversal filter. The invention provides an improved device for filtering having an abrupt transition from stopband to passband, no involved oscillator circuit, no mixing circuit, and is capable of being integrated on a single semiconductor chip.
293482
Hartmann Clinton S.
Norris Jerry L.
Kirby Eades Gale Baker
Texas Instruments Incorporated
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