Data converter with reduced differential nonlinearity

Details Data converter with reduced differential nonlinearity Data converter with reduced differential nonlinearity

2006-03-21

2006-03-21

Young, Brian (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

C341S161000

Reexamination Certificate

active

07015853

ABSTRACT:
Methods and apparatus are provided for reducing nonlinearities in an analog-to-digital signal converter. An analog pseudo-random noise sample is added to an analog input sample and the combined sample is converted into a digital representation. A pseudo-random digital sample corresponding to the analog noise sample is subtracted from the converted digital representation. Preferably, multiple analog noise samples are added to the analog input sample, converted and corresponding digital noise samples subtracted from the converted digital representation. The multiple digital representations are then averaged, thereby nullifying differential nonlinearities in various portions of the transfer characteristics curve of the signal converter and reducing the effects of the DNL.

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