Low power analog to digital converter

Details Low power analog to digital converter Low power analog to digital converter

2005-01-04

2005-01-04

Wamsley, Patrick (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

C341S172000

Reexamination Certificate

active

06839015

ABSTRACT:
An analog to digital converter includes a first charging circuit that samples an input voltage during a charging phase. A first opamp has an input that communicates with the first charging circuit during an integrating phase. A first current source selectively generates a first bias current for the first opamp during the charging phase and a second bias current that is not equal to the first bias current during the integrating phase. The first bias current is less than the second bias current. The first current source can be a variable current source that selectively provides the first and second bias currents during the charging and integrating phases, respectively. Alternately, the first current source can include two current sources. Only one of the two current sources is connected to the first opamp during the integrating phase.

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