Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1981-05-18
1982-06-15
Miller, Charles D.
Communications: electrical
Audible indication
Percussion-type sound producer
371 15, 340347DA, 364727, 364826, H03K 1302
Patent
active
043353738
ABSTRACT:
A method for statistically calibrating a digital-to-analog converter with an electronic test system. The digital-to-analog converter is excited with two state signals at each input bit which together represent a single signal with uniform amplitude probability with respect to time, and wherein each excitation signal is orthogonal with respect to all other excitation signals. The output of the digital-to-analogconverter is detected by an analog-to-digital converter which has been calibrated by premeasured weighting coefficients with respect to two-state orthogonal signals. The digital time domain output signals are then mapped into a transform domain to obtain weighting coefficients of each bit of the output response. Finally the transform domain weighting coefficients are weighted by the reciprocal of the premeasured weighting coefficients to obtain the unbiased weight of each bit of the digital-to-analog converter under test. A preferred set of excitation signals is a set of Walsh function signals representing the digital equivalent of a linear ramp function.
REFERENCES:
patent: 3816813 (1974-06-01), Jehu
patent: 4061017 (1977-12-01), Sloane
patent: 4266292 (1981-05-01), Regan
Cukier, "IBM Technical Disclosure Bulletin", vol. 22, _No. 5, Oct. 1979, pp. 1892-1893.
Flamien, "IBM Technical Disclosure Bulletin", vol. 22, No. 11, Apr. 1980, p. 4952.
Pau, "Fast Testing and Trimming of A/D and D/A Converters in Automatic Test Systems", published in the Proceedings of Autotestcon, 1978, IEEE Catalog, 78CH1416-7, Nov. 1978, pp. 268-274.
Fairchild Camera & Instrument Corp.
Miller Charles D.
Park Theodore Scott
Pollock Michael J.
Winters Paul J.
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