Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Reexamination Certificate
2005-12-20
2005-12-20
JeanPierre, Peguy (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
C341S162000
Reexamination Certificate
active
06977606
ABSTRACT:
An arithmetic circuit includes a sample hold portion, an adding portion, a subtracting portion, an A/D sub-converter and a D/A sub-converter. The adding portion adds first and second residual voltages provided from a preceding stage. In a first hold mode, the subtracting portion subtracts an analog voltage from a voltage produced by the addition by the adding portion, and provides a voltage produced by the subtraction as a first residual voltage in this stage to a next stage. In a second hold mode, the subtracting portion interchanges internal capacitors with each other, subtracts the analog voltage from a voltage produced by the addition by the adding portion, and provides a voltage produced by the subtraction as a second residual voltage to the next stage.
REFERENCES:
patent: 5500644 (1996-03-01), Denjean et al.
patent: 6166675 (2000-12-01), Bright
Hisn-Shu Chen et al., A 14-b 10-MSample/s CMOS Pipelined ADC, IEEE Journal of Solid-State Circuits, vol. 36, No. 6, (Jun. 2001), pp. 997-1001.
Birch & Stewart Kolasch & Birch, LLP
Lauture Joseph
Sharp Kabushiki Kaisha
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