Methods and apparatus for a multi-mode analog-to-digital...

Details Methods and apparatus for a multi-mode analog-to-digital... Methods and apparatus for a multi-mode analog-to-digital...

2008-05-27

2008-05-27

Mai, Lam T. (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

C341S155000

Reexamination Certificate

active

07379002

ABSTRACT:
A multi-mode analog-to-digital converter includes a delta-sigma analog-to-digital converter circuit configured to receive the analog input and produce a digital bit-stream associated therewith, the delta-sigma analog-to-digital converter including at least one integrator configured to reset to an initial state in response to a reset signal A digital filter circuit is configured to receive the digital bit-stream and produce two filtered outputs derived from the digital bit-stream. During one mode (e.g., a DC mode) the delta-sigma analog-to-digital converter circuit is configured to receive the reset signal and produce the digital bit-stream for a predetermined number of clock cycles, and the digital output corresponds to the first filtered output. In another mode (e.g., an AC mode), the delta-sigma analog-to-digital converter is configured to continuously produce the bit-stream, and the digital output corresponds to the second filtered output.

REFERENCES:
patent: 5345342 (1994-09-01), Abbott et al.
patent: 6498819 (2002-12-01), Martin
patent: 7205918 (2007-04-01), Niederdrank et al.
Markus, Janos, et al, Theory and Application of Incremental ΔΣ Converters, IEEE Transactions on Circuits and Systems—I: Regular Papers vol. 51; No. 4, Apr. 2004.

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