Existing designs of clock-trees have to assume a given time-invariant worst-case temperature map but cannot deal with a set of temperature maps under a set of workloads.
Previous UK-based work applying a subset of data from the UK Climate Projections model (UKCP09) has indeed indicated likely reductions in the steady-state OHL ratings under worst-case temperature increases.
I helped with the vibration tests at Rutherford Appleton Laboratory ( RAL), the thermal vacuum tests at Birmingham, and performed some thermal modelling to predict worst-case temperature conditions.
The circuit yields 20 ppm/°C of temperature coefficient in typical case and 50 ppm/°C of temperature coefficient in worst case over temperature range −40 to 140°C, 60 ppm/V of supply voltage dependence and 60 dB PSRR at 1 MHz without trimming or extra circuits for the curvature compensation.
In its 1995 analysis, the panel concluded that a worst case would raise temperatures 6.3degreess.
· In the worst case, in which temperatures climb by 3.4C by 2070, none of Australia's ski resorts would be operating at a profit.
One of its most striking findings is its conclusion that the upper range of warming over the next 100 years could be even higher than it estimated in 1995, in a worst case raising the average global temperature 11 degrees Fahrenheit from where it was in 1990.
In addition, it exhibits a worst case reliability of 98.62% over temperature range of – 40 °C to 120 °C and 10% fluctuations in supply voltage, indicating an encouraging reliability and effectiveness.
This concentration is considered worst case (in practice, very high air temperatures do not occur very often in the Netherlands, and the wind would disperse some of the substance), and is well below the European limit value of 1 ng/m3 for BaP (Table 3).
Overdesign means designing for the worst case that is the highest possible environmental temperature when LED efficiency/efficacy is low.
The best case (left) and worst case (right) scenarios considered in the National Climate Assessment both show temperature increases by the end of the century.
