Harmonic distortion reduction technique for data acquistion

Details Harmonic distortion reduction technique for data acquistion Harmonic distortion reduction technique for data acquistion

1985-06-12

1986-09-16

Miller, Charles D.

Communications: electrical

Audible indication

Percussion-type sound producer

364571, H03M 110

Patent

active

046125337

ABSTRACT:
An analog to digital converter (ADC) is presented which uses a calibration technique to reduce harmonic distortion in data acquisition systems. This mechanization also allows faster conversion rates than previously possible for high resolution analog-to-digital converters. This converter makes use of a subrange or "half Flash" architecture where the subrange digital-to-analog converter (DAC) is augmented with a software calibrated DAC which removes system nonlinearities. The advantage of this system is that it allows the building of higher speed data acquisition systems with higher spurious free dynamic range than would be possible with conventional techniques. By adding the correction to the input of the subrange ADC, correction resolution can be a fraction of a quanta. A second approach using the same mathematics places at the output of the ADC a RAM or ROM look up table which linearizes the transfer function.

REFERENCES:
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patent: 4070665 (1978-01-01), Glennon et al.
patent: 4340882 (1982-07-01), Maio et al.
patent: 4393371 (1983-07-01), Morgan-Smith
patent: 4410876 (1983-10-01), Sawagata
patent: 4423408 (1983-12-01), Place
patent: 4544917 (1985-10-01), Lenhoff
IBM Technical Disclosure Bulletin vol. 16, No. 9, Feb. 1974.

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