Method and apparatus for reducing noise in analog-to-digital...

Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion

Reexamination Certificate

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C341S143000

Reexamination Certificate

active

06958723

ABSTRACT:
An analog-to-digital converter apparatus has a plurality of stages. Each stage includes a residue amplifier having a first and second amplifier unit. Each of the amplifier units has a first input locus, a second input locus and an output locus. The amplifier units cooperate in receiving a differential input data signal at the first input loci. A DC level setting signal unit is coupled with the second input loci and provides a DC level setting current in a first current direction. A counter-current signal generating unit is coupled with the second input loci via a single coupling locus common with the second input loci and provides a control current signal to the second input loci in a second current direction opposite to the first current direction. The control current signal provides a DC level control for each of the amplifier units.

REFERENCES:
patent: 6456573 (2002-09-01), Ueki et al.
Analog Devices Product Specification Document: 14-Bit, 80/105 MSPS A/D Converter AD6645; REV. B, Copyright 2003, Analog Devices, Inc.

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