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A high voltage ratio DC–DC converter is proposed which is comprised of four stages. First, an impedance network along with a switching network have been used to boost the input voltage. The boosted voltage waveform is then followed by an isolation transformer to provide another degree of freedom and obtain higher boost ability. Finally, a voltage multiplier rectifier is utilised to rectify the secondary...
This paper presents a new low-cost digital control solution that maximizes the AC/DC flyback power supply efficiency. This intelligent digital approach achieves the combined benefits of high performance, low cost and high reliability in a single controller. It introduces unique multiple PWM and PFM operational modes adaptively based on the power supply load changes. While the multi-mode PWM/PFM control...
The Cell Broadband Enginetrade (Cell BE) processor initially designed for high-end consumer electronics, has been enhanced by IBM for supercomputer applications. The enhancements to the chip also necessitated the design and development of a new package. The modifications to the chip included replacement of the 3.2 Gb/s XDR interface with a 800 Mb/s DDR2 interface of equal bandwidth. This required...
An experimental investigation into the dynamic strength and strain rate sensitivity of 37 wt% Pb-63 wt% Sn superplastic alloy was carried out. Tests were conducted at room temperature and under both uniaxial compression and tensile conditions. The nominal strain rates were varied by seven orders of magnitude, from 10-4 to 103 s -1. Specimens from two different heat treatments (or phase sizes) were...
Uncooled operation for a FP laser is presented. More than 100-degree temperature operation range was achieved for 10 km/2.5 Gb/s. The lasers were fabricated using Al/Zn-free InAsP/InP design for good reliability. Frequency response of 7 GHz at -25/spl deg/C and 5.2 GHz at 85/spl deg/C was measured for TO56 can package.
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