High Speed GaAs Circuits

If GaAs MESFET's are the basic devices for GaAs IC's,it is also discussed that the possibility to make all other types of devices on a semi-insulating substrate, and also the possibility to use an "ideal" heterojunction with large gap material. In addition GaAs offers some specific properties : Gunn effect, luminescence and acoustoelectric effects and can imagine circuits with unusual characteristics, for instance an optical coupling between chips or parts of a chip for the interconnexions.