Active removal of aliasing frequencies in a decimating...

Details Active removal of aliasing frequencies in a decimating... Active removal of aliasing frequencies in a decimating...

2006-09-05

2006-09-05

Raymond, Edward (Department: 2857)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Electrical signal parameter measurement system

C324S076240

Reexamination Certificate

active

07103489

ABSTRACT:
When a sample stream is decimated, frequency components from outside of a desired frequency band are aliased into the desired band, causing interference and loss of information. Different decimating ratios result in different frequencies aliasing into the desired frequency band. A current-mode sampling mixer800with capacitor banks811and812that are controlled by a digital control unit820with a capability to integrate and decimate an RF current at different decimating ratios is able to measure the frequency spectrum with different decimating ratios. The measured frequency spectrum is then analyzed to detect the presence of interferers aliased into the desired frequency band. The interferers can then be eliminated or avoided.

REFERENCES:
patent: 5661810 (1997-08-01), Chahabadi et al.
patent: 6539204 (2003-03-01), Marsh et al.
patent: 6639939 (2003-10-01), Naden et al.
patent: 2002/0081988 (2002-06-01), Parker
patent: 2003/0069911 (2003-04-01), Pllralnen

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