Telecommunications – Receiver or analog modulated signal frequency converter – Plural receivers
Reexamination Certificate
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
07373119
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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Johansson Mats
Petersson Peter Magnus
Nguyen Tony T.
Nixon & Vanderhye P.C.
Telefonaktiebolaget LM Ericsson (publ)
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