Investigation of Digital Signal Processing of High-speed DACs Signals for Settling Time Testing
Rokas Kvedaras, VYGAUDAS KVEDARAS, Tomas Ustinavičius, Audronė Kvedarienė, Ričardas Masiulionis · Universal Journal of Electrical and Electronic Engineering · 2016
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.