Physical-Weight-Based Measurement Methodology Suppressing Noise or Reducing Test Time for High-Resolution Low-Speed ADCs

Mitsutoshi SUGAWARA  Zule XU  Akira MATSUZAWA  

IEICE TRANSACTIONS on Electronics   Vol.E100-C   No.6   pp.576-583
Publication Date: 2017/06/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E100.C.576
Type of Manuscript: Special Section PAPER (Special Section on Analog Circuits and Their Application Technologies)
AD converter,  DA converter,  measurement,  slow-ramp,  histogram method,  moment method,  missing code,  

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We propose a statistical processing method to reduce the time of chip test of high-resolution and low-speed analog-to-digital converters (ADCs). For this kinds of ADCs, due to the influence of noise, conventional histogram or momentum method suffers from long time to collect required data for averaging. The proposed method, based on physically weighing the ADC, intending to physical weights in ADC/DAC under test. It can suppress white noise to 1/22 than conventional method in a case of 10bit binary ADC. Or it can reduce test data to 1/8 or less, which directly means to reduce measuring time to 1/8 or less. In addition, it earns complete Integrated Non-Linearity (INL) and Differential Non-linearity (DNL) even missing codes happens due to less data points. In this report, we theoretically describe how to guarantee missing codes at lacked measured data points.