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We present a 4.4 mm2 single-chip synthesized signal source with 0.125 to 26-GHz output frequency realized on a 0.18um SiGe BiCMOS technology. A core fractional-N synthesizer uses four VCO's and has a 4 to 8-GHz synthesizable range. Additional frequency division and multiplication are used to generate frequencies below 4 GHz and above 8 GHz, respectively. The noise performance achieves -116.7 dBc/Hz...
Existing on-off-keying modulation in optical communication becomes inadequate to meet exponentially growing bandwidth demand. New receiver architectures and algorithms are being sought to confront this challenge. To achieve this goal, we propose innovative adaptive algorithms to simultaneously track optical polarizations and compensate any channel impairment without the need of any optical/electronic...
The University of Maryland's three cavity gyroklystron amplifier operating at a frequency of 10 GHz, voltage of 425 kV, current of 160 A, and pitch angle (ν⊥/νz) near. 82, has demonstrated an efficiency of 35%. Our simulations using fixed field profiles predict a significantly lower efficiency, primarily because of the small pitch angle in the experiment. We will be investigating two methods of improving...
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