Coded data generation or conversion – Analog to or from digital conversion – Digital to analog conversion
Reexamination Certificate
2005-10-31
2010-11-02
Mai, Lam T (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Digital to analog conversion
C326S086000
Reexamination Certificate
active
07825843
ABSTRACT:
In a current steering D/A converter, a 1LSB current source1and a 2LSB current source2are binary code current sources for outputting currents with current values weighted by ½, and a 4LSB current source3is one of a large number of current sources designed as thermometer code current source with the same structure. In first circuits A1, A2and A4for respectively determining constant current values of the current sources1through3, a plurality of MOS transistors with a channel length L3and a channel width W3are cascode-connected to one another with gate terminals thereof shared. In second circuits B1, B2and B4respectively used for setting high output impedance of the current sources1through3, a plurality of MOS transistors with a channel length L4and a channel width W4are cascode-connected to one another with gate terminals thereof shared. Accordingly, the current characteristics of the current sources can be made more uniform while reducing their circuit areas, resulting in improving the linearity of the D/A conversion characteristic.
REFERENCES:
patent: 4914614 (1990-04-01), Yamakawa
patent: 5751711 (1998-05-01), Sakaue
patent: 6281825 (2001-08-01), Lee
patent: 6310568 (2001-10-01), Kurooka
patent: 7417463 (2008-08-01), Danesh et al.
patent: 7466252 (2008-12-01), Radulov et al.
patent: 7626424 (2009-12-01), Danesh et al.
patent: 2004/0070578 (2004-04-01), Kasai
patent: 5-218875 (1993-08-01), None
patent: 2001-156638 (2001-06-01), None
patent: 2004-088158 (2004-03-01), None
patent: 2004-349814 (2004-12-01), None
Bosch, A., et al., “A 10-bit 1-GSample/s Nyquist Current-Steering CMOS D/A Converter”, IEEE Journal of Solid-state Circuits, Mar. 2001, pp. 315-323, vol. 36 No. 3, IEEE.
Mai Lam T
McDermott Will & Emery LLP
Panasonic Corporation
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