Multistage analog-to-digital converter

Details Multistage analog-to-digital converter Multistage analog-to-digital converter

2005-11-29

2005-11-29

Mai, Lam T. (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

C341S155000, C341S136000

Reexamination Certificate

active

06970125

ABSTRACT:
An analog-to-digital converter with a pipeline architecture for converting an analog input signal into a digital output signal with a predefined resolution includes a plurality of stages, each stage having a circuit for converting an analog local signal into a digital local signal with a local resolution lower than the predefined resolution, a circuit for determining an analog residue indicative of a quantization error of the converting circuit, a circuit for amplifying the analog residue by an inter-stage gain corresponding to the local resolution to generate the analog local signal for a next stage, and a circuit for combining the digital local signals of all the stages into the digital output signal weighting each digital local signal according to a digital weight depending on the corresponding inter-stage gain. The combining circuit includes, for at least one of the stages, a circuit for dynamically estimating a digital correction signal indicative of an analog error of the corresponding inter-stage gain, and a circuit for controlling the digital weight according to the digital correction signal.

REFERENCES:
patent: 6337651 (2002-01-01), Chiang
patent: 6466153 (2002-10-01), Yu
patent: 6486820 (2002-11-01), Allworth et al.
patent: 6606042 (2003-08-01), Sonkusale et al.
patent: 6753801 (2004-06-01), Rossi
patent: 6778126 (2004-08-01), Ali
Siragusa, E., et al., “Gain Error Correction Technique for Pipelined Analogue-to-Digital Converters,” Electronic Letters 36(7):617-618, Mar. 30, 2000.

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