Circuit with a successive approximation analog to digital...

Details Circuit with a successive approximation analog to digital... Circuit with a successive approximation analog to digital...

2011-07-05

2011-07-05

Lauture, Joseph (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

C341S118000

Reexamination Certificate

active

07973693

ABSTRACT:
During successive approximation analog to digital conversion a series of successive digital reference values is selected that converges towards a digital representation of an analog input signal. An analog reference signal is generated dependent on the successive digital reference values and compared to the analog input signal. The digital reference values are selected dependent on comparison results. In the selection of the digital reference values successive steps between digital reference values are each selected dependent on values of the comparator result from a plurality of preceding recursion cycles. The comparison results define a series of successively narrower ranges of digital values that contain a digital representation of the analog input signal. Use of a plurality of comparator results for selecting the steps in the digital reference values makes it possible to reduce uncertainty about whether the comparison result has settled. This in turn makes it possible to reduce the sizes of the successive ranges, which speeds up convergence.

REFERENCES:
patent: 5057841 (1991-10-01), Veerhoek et al.
patent: 6351231 (2002-02-01), Price et al.
patent: 406973 (1991-01-01), None
patent: 99/04496 (1999-01-01), None
patent: 99/55005 (1999-10-01), None
Bacrania, Kanti; “A 12-Bit Successive-Approximation-Type ADC With Digitial Error Correction”; IEEE Journal of Solid-State Circuits, vol. SC-21, No. 6; Dec. 1986; pp. 1016-1025.

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