Delta-sigma analog digital converter with offset compensation

Details Delta-sigma analog digital converter with offset compensation Delta-sigma analog digital converter with offset compensation

2007-01-22

2008-07-29

Mai, Lam T (Department: 2819)

Coded data generation or conversion

Converter calibration or testing

C341S143000

Reexamination Certificate

active

07405682

ABSTRACT:
The invention concerns a time-continuous delta-sigma analog-digital converter for the conversion of an analog input signal into a digital output signal, comprising an analog filter for the filtering of the analog input signal, a clocked operated quantiser, which contains at least one comparator (34) and which quantises the filtered analog signal outputted through the analog filter for the generation of the digital output signal, and a feedback arrangement with at least one digital-analog converter, which supplies to the analog filter at least one feedback signal on the basis of the digital output signal. According to the invention a calibration device (32) linked with the quantiser is stipulated, which is designed to determine at a predetermined point in time an offset error of the comparator (34) and subsequently to compensate for this (Itrim).

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patent: 601 13 442 (2006-01-01), None
Moyal, et al.,“A 700/900m W/Channel CMOS Dual Analog Front-End IC for VDSL with Integrated 11.5/14.5dBm Line Drivers”; 2003; IEEE International Solid-State Circuits Conference, Mixed-Signal and Wireline Techniques, Paper 23.6, pp. 1-10.

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