Coded data generation or conversion – Analog to or from digital conversion – Digital to analog conversion
Reexamination Certificate
2006-09-19
2006-09-19
JeanPierre, Peguy (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Digital to analog conversion
C341S154000
Reexamination Certificate
active
07109904
ABSTRACT:
A differential digital-to-analog voltage converter (VDAC) includes, in part, a resistor, and at least two decoding stages. The resistor is divided into N equal segments each disposed in a different one of N decoders forming a first decoding stage. The resistor segment in each decoder is further divided into M equal segments to provide M tapped nodes. Each decoder of the first decoding stage delivers two of the M tapped voltages to a pair of associated output nodes, and that are complementary with respect to a voltage present at the center of the resistor segment disposed in that decoder. A second decoding stage receives the first and second voltages delivered by each of the N decoders and delivers two of these voltages, that are complementary with respect to a voltage present at the center of the resistor, to a pair of third and fourth output nodes.
REFERENCES:
patent: 5689259 (1997-11-01), Ozguc
patent: 6778122 (2004-08-01), Lien
patent: 6914547 (2005-07-01), Swaroop et al.
patent: 2002/0145552 (2002-10-01), Gorman
patent: 2005/0195098 (2005-09-01), Panov et al.
Exar Corporation
Jean-Pierre Peguy
Townsend and Townsend / and Crew LLP
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