Coded data generation or conversion – Analog to or from digital conversion – With particular solid state devices
Reexamination Certificate
2005-03-28
2008-11-25
Jeanglaude, Jean B (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
With particular solid state devices
C341S144000, C341S145000
Reexamination Certificate
active
07456767
ABSTRACT:
A D/A converter circuit includes a first current mirror circuit and a second current mirror circuit. The first current mirror circuit has a plurality of output side transistors provided correspondingly to digits of data to be converted and generates en analog current by obtaining, in at least one of the output side transistors, a current corresponding to the weight of the digit of the data being converted. The second current mirror circuit is connected on an upstream or downstream side of the output side transistors and corresponding to a lower digit of the data. An analog current is generated with the second current mirror circuit by obtaining a current corresponding to a weight of a digit that is less than 1.
REFERENCES:
patent: 6480178 (2002-11-01), Itakura et al.
patent: 6654066 (2003-11-01), Vu et al.
patent: 2003/0184236 (2003-10-01), Maede et al.
patent: 0541163 (1993-05-01), None
patent: 55-034537 (1980-03-01), None
patent: 11251912 (1999-05-01), None
patent: 2003-234655 (2003-08-01), None
Abe Shinichi
Fujikawa Akio
Fujisawa Masanori
Maede Jun
Jeanglaude Jean B
Mattingly, Stanger Malur & Brundidge PC
Rohm & Co., Ltd.
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