Abstract
Filtering of the measurement signals using digital brick-wall comb filters in frequency domain developed by the authors and measurement of the settling times of DACs are discussed in this paper. Results of the investigations made have shown that digital brick-wall comb filters are capable of reducing noise level by 10 times while keeping measurement signal undistorted. Investigation of the developed settling time measurement algorithm has determined influence of the internal noise of the sampling converter, noise of the transmission line, ADC and other sources of noise to the settling time measurement errors. It has been proved that by using the earlier developed measurement converter and the proposed digital filtering of the DAC signal it is possible to measure settling times of 12-14 bit DACs.
Highlights
High-Speed digital-to-analogue converters (DACs) are widely used in today’s electronics industry
Settling time has to be measured according to the resolution of the DAC itself and for 14 bit DAC the threshold voltages of the settling time measurement is only ±1/(215) (0.5 of Least Significant Bit (LSB)) of maximum output voltage
The automated sampling testers were developed and implemented by the authors. These testers are suitable for measurement of settling times of High-Speed 8–14 bit DACs [4, 5, 8]
Summary
High-Speed digital-to-analogue converters (DACs) are widely used in today’s electronics industry. The automated sampling testers were developed and implemented by the authors These testers are suitable for measurement of settling times of High-Speed 8–14 bit DACs [4, 5, 8]. In order to perform automatic measurement of settling times of 14 or higher resolution DAC it is necessary to convert DAC output signal with transformed timescale to digital form and to perform digital signal processing [4, 8] For this purpose tester with conversion of output signal and the developed digital processing has been developed and implemented [10]. Authors have developed and investigated a new structure of the sampling tester for measurement of dynamic parameters of high-speed DACs [11] using best achievements of the previous testers and extending their capabilities by the use of modern components and digital signal processing algorithms. The aim of this paper is to present new results of investigation of DSP for settling time determinations applying the proposed comb filters
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