STEP-WISE APPROXIMATED MULTI-CYCLE SINE WAVE FOR DYNAMIC QUALITY TESTS OF AD CONVERTERS

摘要

For dynamic quality tests of the AD converters a high quality test signal is required. When testing a high speed AD converters, the conventional test signals have reached their dynamic and resolution limits. In this paper an overview of using the step-wise approximated multi-cycle sine wave as a test signal for dynamic quality tests of high speed, high quality AD converters is presented. The proposed test signal is characterised by high stability time and amplitude parameters. The slight difference in the heights of steps of the sequential single cycles ensures stimulation of all codes of the AD converter. Basic rules for increasing the accuracy of the spectrum component evaluation by FFT analysis are considered.