Browsing by Author "Aguiar, Rui L."
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- A Study on CMOS Time Uncertainty with Technology ScalingPublication . Figueiredo, Mónica; Aguiar, Rui L.This paper evaluates the clock generation quality of different digital circuits associated with clock generation and distribution. Circuit’s noise response, jitter, and uncertainty are evaluated for different noise sources and loading conditions. We present performance simulations for inverters and inverter chains implemented in different technologies from AMS and UMC foundries. We show that the device size-scaling trend is increasing the uncertainty associated with this circuits, decreasing their precision. The correlation between circuit’s parameters and selected performance metrics is also highlighted.
- Time precision comparison of digitally controlled delay elementsPublication . Figueiredo, Mónica; Aguiar, Rui L.This paper compares the time precision of different digitally controlled delay cells. Other design metrics as delay, signal integrity, power and area are also considered. The precision is evaluated by the cell's uncertainty, given as the ratio between jitter and time delay, considering both thermal and power supply noise. The comparison is based on circuit simulation, in a 180nm technology, using the SPECTRE tool from Cadence. The comparison results will help the designer to choose the most appropriate delay cell for low uncertainty design.