OVERSAMPLING METHOD FOR THE STATIC CHARACTERIZATION OF HIGH RESOLUTION DAC: A PROPOSAL FOR THEIEEE STANDARD P1658
Abstract
The paper presents an improved implementation of a method pointed out for the static characterization of the new generation of high resolution Digital to Analogue Converters (DACs). Interesting aspect of this method is that the problem of the signal acquisition with high resolution is shifted to the simpler problem of the signal acquisition with high speed. In particular, the method is based on the comparison of the DAC output voltage with the analogue reference sinusoidal voltage and the detection of the Zero Crossing Sequence (ZCS) of the resulting signal by high speed ADC. The variation of the ZCS respect to that occurring in the sinusoidal reference signal is used to evaluate the DAC transfer characteristic. The improved implementation concerns the proper design characteristics that can be used as selecting criteria of the test equipment. In particular, the substitution of the ADC for the detection of the ZCS by the comparator device is investigated without affecting the accurate detection of the zero crossing. Moreover, the effects of the noise parameters affecting the generator feeding the reference analogue signal, as amplitude and phase noise, on the evaluation of the DAC static characteristic is analysed by considering test equipment using the comparator device and the high speed ADC, alternatively.
Event details
- Event
- IWADC 2007
- Technical Committee
- TC4
- Place
- Iasi, ROMANIA
- Time
- 19 September 2007 - 21 September 2007