Analyze of temporal and random variability of a 45nm SOI SRAM cell
This paper presents the analysis of a 45nm SOI SRAM cell variability including history effects and random variability. This leads to an accurate margin calculation.
Physical IP for SOI design infrastructure
ASIC design is today achieved by mixing different physical IP blocks including standard cells, memory compilers, IO and analog blocks when needed. The circuits are designed using a given EDA flow, starting from high-level functional description (RTL netlist) and going down to the physical implementation. This process involves logical synthesis to achieve the required functionality, timing analysis, power analysis and area optimization performed before and after routing of the different blocks. This process has become quite complex and necessitates many iterations to reach the expected result in term of speed, power consumption and area. As SOI processes become more popular and are now considered for use in ASIC beyond the traditional use for CPU, it has become crucial to put in place the corresponding physical IP libraries.
Production of xylanase by Aspergillus awamori on complex medium in stirred tank and airlift tower loop reactors
Abstract Aspergillus awamori was cultivated on complex medium containing wheat bran as sole carbon source in the precultures as well as in the main cultures in stirred tank and airlift tower loop reactors. The decomposition of the wheat bran particles by α -amylase and xylanase produced by the fungus was investigated by monitoring the enzyme activities, the CO 2 production rate, the concentrations of reducing sugars, glucose, xylose, phosphate and ammonium as well as by applying transmission electron microscopy. By applying synthetic medium in the preculture, the time lag was longer, the growth faster, the xylanase activity higher in the main culture, than by using wheat bran in the preculture. With increasing the stirrer speed the intimate contact between the pellets and the wheat bran was reduced, which caused a decrease of the growth and the xylanase production. By applying ground wheat bran, filamentous mycelium was formed, the growth and the substrate uptake rates increased, but the xylanase production decreased due to the less intimate contact between the fungus and the wheat bran. In the airlift tower loop reactor filamentous mycelium was formed due to the low specific power input. In spite of the high medium viscosity, high xylanase productivity was obtained. With ground wheat bran the particles were completely covered by filamentous mycelium, medium viscosity strongly increased and as consequence the growth and xylanase production decreased.