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US 4,360,791 AGranted
Frequency converting filter
AssigneeTexas Instruments Incorporated
InventorsJerry L. Norris, Clinton S. Hartman
Life of this patent
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Abstract
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 nf.sub.s .+-.f.sub.o. The non-sampling filter has a single passband. The single passband has a width of less than f.sub.s -f.sub.o -.DELTA.f/2 and it is centered to include only a selected one of the passbands of the transversal filter.
Claims1
A frequency converting filter comprising:
- a split electrode charge coupled device transversal filter for receiving an input signal and having a plurality of serially connected split electrode stages which form an impulse response, said transversal filter including signal sampling means for providing samples of the input signal at a predetermined sampling frequency;
- and
- a non-sampling filter for providing the resultant output;
- said transversal filter having an output lead coupled to an input of said non-sampling filter, and having frequency passbands of width .DELTA.f centered at fixed frequencies nf.sub.s .+-.f.sub.o, where
- n=an integer multiple of the sampling frequency,
- f.sub.s =the sampling frequency, and
- f.sub.o =the center frequency, removed from the sampling frequency, of the desired frequency passband;
- the splits in said split electrode stages of said transversal filter having a profile proportional to (sin/n) (cos 2.pi.f.sub.o n);
- and
- said non-sampling filter having a single passband, said single passband having a width of less than f.sub.s -f.sub.o -.DELTA.f/2 and being centered to provide only a selected one of said passbands of said transversal filter as the resultant output.
7 more elements
Dependencies are inferred from the claim text.