The objective of CLASSIC is to develop a technology for 60 GHz non-linear millimetre wave components such as power amplifiers, mixers and oscillators. The work will concentrate on the pseudomorphic heterojunction field-effect transistor (PM-HFET), believed to be by far the most promising device for the fulfilment of these functions at millimetric wave frequencies. Suitable modelling techniques for devices and circuits will also be developed.
Improved heterostructure material pseudomorphic heterojunction field effect transistor (PMHFET) devices have been developed. After processing with a 0.15 micron T-gate technology also developed in the project, state of the art PMHFETs have been fabricated. Nonlinear modelling has been implemented and used in circuit simulation. Buffer amplifiers and oscillators have been fabricated and power amplifiers and mixers designed. Passive coplanar structures have been fabricated and characterized for use in coplanar monolithic microwave integrated circuit (MMIC) designs.
The project will initially focus on fabricating specific nonlinear circuit functions for applications in the field of mobile communications (broadband mobile communications and short-range beacon-vehicle and vehicle-vehicle communications, including concepts for systems arising from the RACE and DRIVE programmes). However, the technology will be equally applicable to other potentially high-volume applications, such as hazard warning systems for cars, or for applications such as inter-satellite links.
The demonstrators chosen, which will be fabricated as MMICs at the end of the project, include an up-converter, an image rejection mixer, and oscillator, and power amplifiers. Coplanar wave-guide techniques will also be developed and applied. A significant part of the project is directed towards the manufacturability of these devices, including work on reliability and coordination activities, and is expected to establish European second-sourcing of the components.
The main outcome planned is a technology for the fabrication of 60 GHz GaAs MMICs including non-linear components. This technology will be exploited by commercialising components, subassemblies, and GaAs foundry possibilities arising from the technology developed.
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