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A deeper understanding of emergence of global patterns in social systems such as diffusion of ideas, emergence of norms & conventions, higher organizations, collective wisdom and evolution of culture; through simple and predictable local interactions of individuals, has been a long quest for sociologists. Agent-based modeling is the latest approach which has virtually replaced the use of traditional...
A hybrid thin film/CMOS microsystem for fluorescence contact imaging is presented. The microsystem integrates a high-performance optical filter and a 128times128-pixel imager fabricated in a 0.35 mum technology. The thin-film filter is fabricated and characterized prior to assembly. Its optical density (OD) is over 6.0 at the wavelength of interest. The performance of the microsystem is experimentally...
We present a capacitive digital-to-analog converter (DAC) architecture combining properties of the binary-weighted and serial charge-redistribution DACs to yield high integration density and high accuracy. The architecture provides the flexibility to trade area with conversion speed based on a set of area-speed-linearity constraints. We validate the architecture using a 10-bit two-step DAC example,...
A Ku-band 140 W space TWT of gain (>55 dB), electronic efficiency (>24%), collector efficiency (>75%), overall efficiency (>55%), I/M components (<-12 dBc) for frequency 10.9-11.7 GHz has been designed and developed for satellite communication system. This paper presents critical design issues and approach related to different assemblies like electron gun, PPM focusing, helix SWS, input...
A high efficiency 140W radiation-cooled Ku-band TWT has been designed successfully for communication satellite. This TWT with input coaxial coupler and output waveguide coupler was designed in 2-sections to achieve gain >55dB at MOW output power over the frequency range of 10.9-11.7GHz with high stability and high linearity.
In this paper, authors have presented experimental results for two TWTs, developed for satellite communication. Both the TWTs have four-stage depressed collectors and delivering 60 W CW power in C-band. The results have been presented by varying the control anode potential and keeping the other voltages constant
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