Coded data generation or conversion – Analog to or from digital conversion – Digital to analog conversion
Reexamination Certificate
2006-09-19
2006-09-19
Young, Brian (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Digital to analog conversion
Reexamination Certificate
active
07109903
ABSTRACT:
Provided is a digital-analog converter circuit that enables, for example, securing an improved accurate analog signal voltage and preventing increase in the circuit size. A first node of each individual unit is connected to a middle node of a one-order higher unit than a unit having that first node. A second node of the each individual unit is connected to one of the first and second nodes provided in the one-order higher unit than the unit having that second node, the one being on the side connected to a resister section set to an impedance value2Z. A hierarchical structure can be formed in which an opponent connection point of the second node is selected by a hierarchy switch section, whereby the each individual unit is parallel connected to the resister section provided in the one-order higher unit and set to the impedance value2Z. In correspondence to an input first-order bit signal (D0), an analog signal voltage (AV) corresponding to an output code (1) of digital data is output from a lowest-order bit unit (LU). In this manner, the D-A conversion operation is performed.
REFERENCES:
patent: 5648780 (1997-07-01), Neidorff et al.
patent: 6384762 (2002-05-01), Brunolli et al.
patent: 6567026 (2003-05-01), Gorman
patent: 61292322 (1986-12-01), None
patent: 10-154937 (1998-06-01), None
European Search Report dated Sep. 30, 2005, 3 pages.
Arent & Fox PLLC
Young Brian
LandOfFree
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