Coded data generation or conversion – Analog to or from digital conversion – Increasing converter resolution
Reexamination Certificate
2006-02-21
2006-02-21
JeanPierre, Peguy (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Increasing converter resolution
C341S155000, C341S143000
Reexamination Certificate
active
07002497
ABSTRACT:
Methods and systems for applying digital dither in data converters, such as delta-sigma data converters. In one embodiment, an analog signal from a first path of a delta-sigma modulator is quantized to an m-bit digital signal and an n-bit dithered digital feedback signal is generated from at least a portion of the m-bit digital signal. The n-bit dithered digital feedback signal is converted to an analog feedback signal and fed back to a second path of the delta-sigma modulator. In another embodiment, the n-bit dithered digital feedback signal is generated by selecting one of a plurality of sets of n-bits from the m-bit digital signal depending upon a state of a dither control signal. The dither control signal can alternate or pseudo-randomly switch between a plurality of states. The m-bit digital signal may be an m-bit thermometer code signal.
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Jean-Pierre Peguy
Sterne Kessler Goldstein & Fox PLLC
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