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Contribution of satellite altimetry data in the geophysical investigation of the Red Sea region, Egypt

100%

Zahran K. , Saleh S.

2006

tom Vol. 54, no. 3

303-318

Successful development of geodetic satellite missions has aroused new inter-est in determining global and regional gravity field based on satellite data. Satellite altimetry data enable direct determination of the geoid over sea regions. In Egypt, where land and marine geophysical data are inadequate because of rough topography and economic reasons, the use of satellite altimetry data is of special importance. The northern Red Sea region has been selected as a site for case study of the current research, after applying spectral analysis to reveal near-surface structure, the residual geoid of the studied region shows a good correlation with the known geo-logic features. Moreover, satellite-based gravity data enhance small-scale features and agrees well with land and marine gravity data. Thus, geoid undulation and sat-ellite gravity data can be a complementary source of data to determine near-surface and deep structures.

A comparative study of super-regenerative receivers for BAN applications

100%

Saleh S. , Hamdy G.

tom Vol. 8, nr 4

133--138

Super-regenerative receivers have regained attention due to their unique properties making them suitable candidates for applications necessitating simplicity and ultra-low power consumption such as Body Area Networks (BAN) targeting medical devices and near body entertainment devices. In this paper, several super-regenerative receivers are proposed showing the flexibility and the ability to accommodate proper demodulation of on-off-keying (OOK) and Multi-level (M-ary) PSK modulated signal with a very limited power budget. Circuit implementation and simulation results are shown.

Design of high-performance PFD-CP for 403MHz CMOS fractional-N frequency synthesizer

80%

Saleh S. , Hamdy G. , Elsemary H. , Zaki A.

tom Vol. 8, nr 3

97--100

This brief discusses the challenges and employs a novel charge-pump and a PFD/CP linearization technique to improve the performance of a 403MHz fractional-N PLL. Techniques are proposed to improve the linearity of the PLL by forcing the PFD/CP to operate in a linear part of its transfer characteristics, while the charge-pump minimizes the current mismatch between the up and down currents by using feedback. The circuit is designed in 0.13jim CMOS process and consumes a total power of 2.6mW. The simulation results show that the synthesizer has a phase noise of-128dBc/Hz at 1MHz offset.