Analog to digital conversion apparatus

Details Analog to digital conversion apparatus Analog to digital conversion apparatus

2007-08-23

2008-12-09

Nguyen, Khai M (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

C341S120000, C341S139000

Reexamination Certificate

active

07463180

ABSTRACT:
An up-converter124frequency-up-converts an analog signal Sm. A down-converter121frequency-down-converts analog signal Sm. A signal selection block125selects one of the frequency-up-converted signal Sfu and frequency-down-converted signal Sfd. The signal Se selected by the signal selection block125is provided to the primary winding of a transformer127. A signal induced in the secondary winding of the transformer127is provided to an A/D converter128to produce a digital signal Dm. For example, if the analog signal Sm has DC or a low frequency close to DC, the signal Sfu is selected as the signal Se. If the analog signal Sm does no have DC nor a low frequency close to DC, the signal Sfd is selected as the signal Se.

REFERENCES:
patent: 6407691 (2002-06-01), Yu
patent: 6741847 (2004-05-01), Claxton et al.
patent: 6933874 (2005-08-01), Pentakota
patent: 7129872 (2006-10-01), Qvortrup et al.

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