Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Reexamination Certificate
2006-05-02
2006-05-02
Wamsley, Patrick (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
C341S161000, C341S172000
Reexamination Certificate
active
07038609
ABSTRACT:
A SAR converter having enhanced performance by virtue of effectively pre-loading the SAR's most significant bits with a value that makes the associated DAC output almost equal to the signal to be converted. A normal SAR conversion is then completed with the SAR bits that have not been pre-loaded. The value used to pre-load the most significant bits of the SAR is preferably obtained from a low-resolution, high-speed converter, such as a flash. The range of DAC bits used in the normal SAR part of the conversion may be increased such that errors up to a certain magnitude in the high-speed converter can be corrected. Reducing power consumption of a SAR system can be readily accomplished by reducing comparator supply voltage. For a SAR converter architecture using a CAPDAC array or CAPDAC (capacitor array DAC), fairly large variations in comparator input voltage can be expected under these circumstances. If the input voltage variation becomes too large, damage to the comparator input devices can occur, or inaccuracies may develop. In one embodiment of the invention, the most significant bits are provided by sampling the input signal through a flash ADC that does not suffer from the input voltage restriction described above.
REFERENCES:
patent: 3956708 (1976-05-01), Musa
patent: 4320347 (1982-03-01), Haque
patent: 4641129 (1987-02-01), Doluca et al.
patent: 4907002 (1990-03-01), Kawada
patent: 4940981 (1990-07-01), Naylor et al.
patent: 5247299 (1993-09-01), Lim et al.
patent: 5272481 (1993-12-01), Sauer
patent: 5416484 (1995-05-01), Lofstrom
patent: 5633639 (1997-05-01), Hopkins
patent: 6424276 (2002-07-01), Munoz et al.
patent: 6731232 (2004-05-01), Kearney
patent: 6828927 (2004-12-01), Hurrell et al.
Analog Devices Inc.
Wamsley Patrick
Wolf Greenfield & Sacks P.C.
LandOfFree
Successive approximation analog-to-digital converter with... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Successive approximation analog-to-digital converter with..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Successive approximation analog-to-digital converter with... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3566418