Method and apparatus for minimizing baseband offset error in...

Telecommunications – Receiver or analog modulated signal frequency converter – Frequency modifying or conversion

Reexamination Certificate

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C455S260000, C455S234100, C375S345000

Reexamination Certificate

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10754654

ABSTRACT:
An adaptive dc compensation technique (100) eliminates dc error for both digital and constant envelope modulation protocols (108). For analog modulation, a dc averaging technique utilizes piece-wise continuous dc averaging (110) that calculates discrete dc error values over a variable number of samples (112) and updates the dc compensation value as a fixed value for a specified sample length (114). The piece-wise “update-and-hold” technique (110) results in a pseudo high pass filter response with an equivalent corner. For digital modulation, a continuous high pass filter section of the receiver is enabled (120).

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patent: 2002/0160734 (2002-10-01), Li et al.

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