| HEMT's Design for Applications beyond 100GHz (2002) | |||||||||||||
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| HEMT Design for Applications beyond GHz Bollaert Parenty Wallart Happy Dambrine Cappy Institut Electronique Microelectronique Nanotechnologies UMR CNRS partement Hyperfr quences Semiconducteurs Cit Scientifique Avenue Poincar Villeneuve Ascq Cedex France sylvain bollaert iemn univ lille Introduction Electronics GHz have applications atmospheric sensing radio astronomy passive imaging applications wide band communication systems Millimeter Wave MMW analog and numerical circuits have developed HEMTs InP substrate are largely used band GHz and band GHz circuits Improvement frequency operation has been obtained reduction gate length nanometer values and higher Indium content Another field application induced the demand higher bit rate communication which rapidly growing Gbit system has been recently developed and intensive research Gbit and Gbit being done Analog and numerical circuits used such optical transmission systems can also realized with nanometer gate length InP based HEMTs With InP based HEMTs possible reach higher than GHz with nanometer gate length obtain that good value gate recess undercut has been optimized Cutoff frequency important parameter particularly for numerical circuits However reduction gate length will involve increase short channel effects This point will limit the maximum oscillation frequency fmax and microwave performance analog circuits avoid this effect layer structure has correctly designed for sub nanometer gate length HEMTs this paper present o | |||||||||||||
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