Method and apparatus for analog-to-digital conversion

Details Method and apparatus for analog-to-digital conversion Method and apparatus for analog-to-digital conversion

2008-05-13

2008-05-13

Nguyen, Tony T. (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Plural receivers

C455S150100, C455S183100, C455S275000, C375S316000, C375S346000, C324S322000

Reexamination Certificate

active

10091596

ABSTRACT:
The present invention eliminates the need for an anti-aliasing filter in a receiver that employs an analog-to-digital converter. By maintaining a predetermined relationship between a local oscillator frequency and the sampling frequency of the analog-to-digital converter, aliasing that would normally occur in the desired pass band is avoided. More specifically, the frequency of the periodic signal provided to the mixer is an integer multiple of half the sampling rate of the analog-to-digital converter. In a preferred, non-limiting example embodiment, the sampling rate of the analog-to-digital converter FADCand the frequency of the local oscillator FLOare related by the following: FLO=n*FADC/2, where n is any positive integer.

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