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In this paper, a piecewise bipolar junction transistor (BJT) process spread compensation scheme is presented. By exploiting the strong correlation between the BJT saturation current and the piecewise base recombination current, the process spread and proportional-to-absolute-temperature (PTAT) drift of the base-emitter voltage (Vbe) can be reduced over a wide temperature range. Fabricated in standard...
Performance counters (PCs) embedded in microprocessor are frequently used to characterize workload and predict thermal behavior for multicore processors. These PCs are required to be highly accurate, very compact, and tunable to workload changes in real time. Traditionally these PCs are selected using correlation map or some sort of statistical trial-error techniques. These techniques have the disadvantage...
In order to explain the experimentally found non-uniformity of the dark currents corresponding to different pixels of a video-camera chip, there were accomplished: a) a numerical study of the temperature dependence of the dark currents, in order to find the most convenient theoretical model which can describe sufficiently accurate the experimental data, b) the evaluation of the basic parameters of...
Through long-term field measurement, two occurrence modes of large instantaneous DGDs, less than 10-5 probability, were observed. Most high DGD occurrences would be predictable, as the dominant case clearly shows positive correlation with ambient temperature.
A high bandwidth critical path monitor (1 sample/ cycle at 4-5 GHz) capable of providing real-time timing margin information to a variable voltage/frequency scaling control loop is described. The critical path monitor tracks the critical path delay to within 1 FO2 inverter delay with a standard deviation less than 3 FO2 delays over process, voltage, temperature, and workload. The CPM is sensitive...
Angle resolved photoemission spectroscopy (ARPES) with a synchrotron radiation as an incident photon source was performed on the layered cobalt oxides Na0.8CoO2. The measured electronic structure was compared with that of the Na0.7CoO2 previously reported. The observed energy-momentum dispersion of the Na0.8CoO2 was essentially the same with that of the Na0.7CoO2 except for the small difference in...
Decreasing the length of thermoelectric (TE) module legs results in a significant increase in power density, both for cooling applications and electricity generation. However, this reduction also results in a significant increase of mechanical stress in the legs materials. Thus, it is important to implement an effective method to characterize the mechanical properties, such as mechanical spectroscopy,...
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