A/D converter

Details A/D converter A/D converter

2007-07-31

2007-07-31

Barnie, Rexford (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

With particular solid state devices

C341S126000

Reexamination Certificate

active

11261486

ABSTRACT:
A compact and highly accurate A/D converter includes series-connected computation cells, the number of which is equal to the number for bits in an output signal. The first computation cell includes a first comparison unit for subtracting a reference current from a first input current to generate a first current, and a second comparison unit for subtracting a second input current from the reference current to generate a second current. The second computation cell includes first and second comparison units having the same configurations as those in the first computation cell. The computation cells of latter stages have the same configurations as the second computation cell. Current mirror circuits included in the first and second comparison units of each computation cell generate the first and second currents. Each computation cell outputs a current having an absolute value in accordance with one of the first and second currents.

REFERENCES:
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patent: 2004/0145504 (2004-07-01), Doerrer et al.
patent: 2005/0035892 (2005-02-01), Devendorf et al.
patent: 0 932 047 (1999-07-01), None
patent: 08-079080 (1996-03-01), None

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