Coded data generation or conversion – Converter calibration or testing
Reexamination Certificate
2008-08-07
2010-02-09
Nguyen, Khai M (Department: 2819)
Coded data generation or conversion
Converter calibration or testing
C341S143000, C341S144000, C341S155000
Reexamination Certificate
active
07659841
ABSTRACT:
A circuit and method for compensating sigma-delta modulators in A/D and D/A converters is disclosed. Circuits according to the invention use a low-resolution Sigma-Delta encoded version of the signal to inexpensively encode quadratic and cubic compensation terms. These circuits can encode quadratic and cubic compensation signals with acceptably low quantization noise without requiring the use of expensive multi-bit multipliers to compute the square or cube of the signal. The method includes providing a binary word Q or a binary word C (or both) representing the desired amount of quadratic or cubic compensation to apply. Because the encoded quadratic and cubic signals have only one or a few bits, they can be multiplied by Q and C without the use of expensive multi-bit multipliers and applied to the modulator input or output to provide a compensated result.
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Larson, L.E., “Multibit Oversampled Σ-Δ A/D Convertor with Digital Error Correction”, in Oversampling Delta-Sigma Data Converters, edited by J. Candy and G. Temes, pp. 227-228, IEEE Press 1992, originally printed in Electron. Lett., Aug. 1988, vol. 24, pp. 1051-1052, New York, NY, USA.
Actel Corporation
Lewis and Roca LLP
Nguyen Khai M
LandOfFree
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