Method and apparatus for digital converter testing

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340347AD, 340347DA, 371 25, H03K 1302

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044196563

ABSTRACT:
A method and apparatus is described for dynamically testing the overall performance characteristics of digital-to-analog converts and analog-to digital converters which involve excitation of the converters by an orthogonal function signal. Specifically the method comprises dynamically exercising a converter with an analog or digital signal pattern characterized by the sum of a set of mutually orthogonal functions, the sum having substantially uniform amplitude distribution among allowable states (maximum entropy), and simultaneously examining the output response of the converter for a plurality of basic performance parameters. The basic performance parameters typically include distortion, linearity and optimum gain. The simultaneous examination involves sorting out expected responses to simultaneously applied orthogonal signals. The method yields a relatively complete statistical description of the performance characteristics. The preferred excitation is based on the Walsh functions. The output response is readily analyzed by Fast Walsh Transform processors.

REFERENCES:
L. F. Pau, "Fast Testing and Trimming of A/D and D/A Converters in Automatic Test Systems", published in the Proceedings of Autotestcon '78, IEEE Catalog 78 CH 1416-7, Nov. 1978, pp. 268-274.
Sellier, "IBM Technical Disclosure Bulletin", vol. 22, No. 3, Aug. 1979, pp. 1039-1040.

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