Volume 19, Issue 1, March 2013

A High Gain, Fully Differential Single Stage Folded Cascade Op-amp with 1GHZ Bandwidth [Full Text]

L. Bagheriye, M. Yargholi, S. Toofan and M. Safari

Abstract— This paper presents the design of a single stage, fully differential operational amplifier with high gain and large unity gain bandwidth. A folding cascode topology with two gain boosting auxiliary amplifiers is designed in 0.18μm CMOS processing technology. This Op-amp is ideally suited for gain stages in A/D converters like pipeline ADCs which applied high resolution MDACs. With 6bit MDAC resolution, the op-amp shows a closed loop gain of 32 and high output swing of 1.2 Vp-p from 1.8V supply voltage. Simulations depict a unity gain bandwidth of 1.13GHz and a DC gain of 75dB, with 2 pF load capacitor. 

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Determination and Visualization of the Trajectories of Satellites [Full Text]

S. Berrezzoug, A. Boudjemai, and F.T. Bendimerad

Abstract— The detailed definition and optimization of satellites required to build the most advanced knowledge in a wide range of disciplines (mechanical space, radio frequency, thermal exchange, control, etc.).. Therefore, for the design of a satellite, many and various technical problems must be solved, including the orbital position of the satellite. The purpose of this study is to develop a method of calculating orbits and the use of algorithms to compute the ground track of the satellite allowing visualization of the latter in a terrestrial planisphere.