Sb doped SnO2 has been deposited on polished ceramic Al2O3 substrates by Pulsed Laser Deposition. Conductivity, charge carrier density and mobility of these thin films have been measured as a function of temperature. A model for the electrical properties of the films is proposed. Since Sb doped SnO2 is a transparent, high mobility material, it is shown that it can be used as channel material for an all-oxide thin film transparent field-effect transistor with a linear dielectric.