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About Emerald www.emeraldinsight.comEmerald is a global publisher linking research and practice to the benefit of society. The company manages a portfolio of more than 290 journals and over 2,350 books and book series volumes, as well as providing an extensive range of online products and additional customer resources and services.Emerald is both COUNTER 4 and TRANSFER compliant. The organization is a partner of the Committee on Publication Ethics (COPE) and also works with Portico and the LOCKSS initiative for digital archive preservation.ABSTRACT-This paper intends to demonstrate the feasibility of thick film piezoelectric layers on ceramic substrates. Advantages of this technology for the realisation and improvement of some devices, such as loudspeakers and couplers (to be applied in a communication bus), are described.
A robust 0.25pm double-poly SiGe HBT structure using non selective epitaxy has been developed. The device features 70/90GHz fT/fmx with pure SiGe base in 0.25pm BiCMOS technology. Performances up to 120/100GHz fT/fmax are demonstrated for SiGe:C base transistors.
We report the fabrication and electrical characterization of high performance 0.25µm SiGe HBTs incorporating a carbon-doped base grown using non selective epitaxy. A transit frequency f T of 97GHz and a maximum oscillation frequency f max of 94GHz have been obtained together with well balanced static parameters. These are the highest frequency performances reported to date for non selective epitaxy SiGe HBTs, including carbon-doped base devices.
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