Cascade A/D converter

Details Cascade A/D converter Cascade A/D converter

2005-11-15

2005-11-15

Young, Brian (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

C341S155000

Reexamination Certificate

active

06965338

ABSTRACT:
A cascade A/D converter that has shorter settling time and enables high-speed operation is provided. A cascade A/D converter comprises fundamental constituent elements cascaded in plural stages, each fundamental constituent element comprising a first comparator for inputting an analog input signal, a D/A converter for converting an output of the first comparator to an analog signal again, and a subtractor for subtracting an output of the D/A converter from the analog input signal, the fundamental constituent elements comprising: a second comparator for inputting the analog input signal every least significant bit near a transition point of the first comparator; and an arithmetic operating unit for generating upper bits based on an output of the first comparator and interpolating lower bits based on an output of the second comparator.

REFERENCES:
patent: 6020840 (2000-02-01), Ong
patent: 6166674 (2000-12-01), Wingender et al.
patent: 6222477 (2001-04-01), Irie et al.
patent: 6501412 (2002-12-01), Tanabe
patent: 9-238077 (1997-09-01), None

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