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- W2095336864 abstract "Voltage controlled oscillator (VCO) is the most ubiquitous element in all communication systems, wired or wireless. In a wireless system the quality of the communication link is determined in large part by the characteristics of the VCO. The capacitance of metal/insulator/semiconductor (MIS) shows larger variation from the accumulation region to the depletion region. The dielectric constant of hafnium dioxide is larger (around 25) than that of SiO <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>2</sub> (~3.9). Al/Hafnium oxide (HfO <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>2</sub> )/Si show a field dependent permittivity and can be used as a dielectric in voltage tunable capacitors. In this work, we used two types of tunable capacitor in the VCO (LC tank and Colpitts circuit) integrated within PCB: one is Al/HfO <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>2</sub> /Si (HfO) capacitor, the other one is Philips BB135 p-n junction capacitor for a control. The maximum MIS capacitance ratio is 4.25. The Al/HfO <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>2</sub> /Si capacitors are then implemented as the varactor in the VCO circuit." @default.
- W2095336864 created "2016-06-24" @default.
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- W2095336864 date "2007-01-01" @default.
- W2095336864 modified "2023-10-14" @default.
- W2095336864 title "Study on the voltage-controlled-oscillator circuit implemented with Al/HfO<inf>2</inf>/Si capacitors" @default.
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- W2095336864 doi "https://doi.org/10.1109/impact.2007.4433589" @default.
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