Correction of nonlinear output distortion in a Delta Sigma DAC

Details Correction of nonlinear output distortion in a Delta Sigma DAC Correction of nonlinear output distortion in a Delta Sigma DAC

1998-09-29

2000-11-21

Williams, Howard L.

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

341144, H03M 300

Patent

active

061509698

ABSTRACT:
A delta sigma modulator of at least second order includes correction means applied to each feedback loop in the modulator, to account for systemic nonlinear output distortions. Since the output distortion is nonlinear, the correction applied to each feedback loop is nontrivially different. Such a corrected delta sigma modulator may be used in a demodulator including an output digital to analog converter (DAC) to account for systemic imperfections in the pulses formed by the DAC. The corrected delta sigma modulator is also useful in correcting output errors associated with high quality multilevel demodulators and class D power amplifiers. The corrected delta sigma modulator may be one bit or multilevel.

REFERENCES:
patent: 5327133 (1994-07-01), Greene
patent: 5548286 (1996-08-01), Craven
patent: 5708433 (1998-01-01), Craven
patent: 5784017 (1998-07-01), Craven
patent: 5838272 (1998-11-01), Steiner et al.
"Delta-Sigma Converter Having Linear Conversion Transfer Function Independent of Signal Edge Transition Asymmetry of the Coder," IBM Technical Disclosure Bulletin, US, IBM Corp. New York, vol. 32, No. 6A, Nov. 1, 1989, pp. 391-392, XP000043253. ISSN:0018-8689.

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