Amr Hafez

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As narrowband off-chip RF filtering is not compatible with the concept of software defined radio (SDR), an SDR receiver must be designed to tolerate large out-of-band blockers with minimal gain compression and noise figure degradation. A recent circuit [1] tackles this problem by dispensing with the LNA entirely. This mixer-first approach achieves(More)
A 0.18-mum CMOS tri-band MIMO transceiver for fixed and mobile WiMAX applications is presented. The transceiver supports operation in the 2.3-2.7 GHz, 3.3-3.8 GHz, or 4.9-5.95 GHz bands. A novel DC-offset removal scheme is used to enable a low-cost direct-conversion architecture. The transmitter exhibits an EVM of -38 dB, -36 dB, and -33 dB @ 0 dBm output(More)
PURPOSE The aiming was to study the long-term clinical outcome and the merit of the author's modification of the fox's procedure. METHODS Mersilene mesh brow suspension (MMBS) procedure was performed in 50 upper lids with severe blepharoptosis and poor levator function. RESULTS The improvement in lid height was evaluated by preoperative and(More)
BACKGROUND We evaluated the efficacy of a single-injection technique for percutaneous peribulbar anesthesia with a short needle as an alternative to the double-injection technique for cataract extraction. METHODS We included 200 patients who underwent elective cataract surgery randomized into 2 equal groups. They received either single-injection(More)
  • Amr Hafez
  • 2010
PURPOSE To evaluate the results of reconstruction of large defects in the upper lid using two composite contra-lateral eyelid margin grafts. METHODS This is an interventional case series in which a large full thickness defect of the upper lid was reconstructed in 7 patients using two composite eyelid margin grafts and myocutaneous advancement. The grafts(More)
PURPOSE This study compared the efficacy of single-injection percutaneous peribulbar anesthesia (PBA) with a short needle with sub-Tenon's anesthesia (STA) to produce optimal operating conditions for cataract extraction in patients with complicated cataract. METHODS Two hundred patients with complicated cataract were enrolled in this prospective,(More)
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