Patent ID: 8169771

Claim:
A thin film capacitor comprising at least two electrodes separated by a dielectric formed by superposition of at least two thin layers respectively presenting quadratic voltage coefficients of capacitance of opposite signs, wherein the two thin layers are made of a same metal oxide, respectively in crystalline form and in amorphous form, the respective thicknesses d a and d c of the amorphous and crystalline thin layers complying with the following general formulas: d a = ɛ 0 ⁢ ɛ a C s ⁢ ⁢ 0 ⁢ ( 1 1 - ( ɛ c ɛ a ) 2 ⁢ γ a γ c ) ⁢ ⁢ and ⁢ ⁢ d c = ɛ 0 ⁢ ɛ c C s ⁢ ⁢ 0 ⁢ ( 1 1 - ( ɛ a ɛ c ) 2 ⁢ γ c γ a ) where: ∈ 0 corresponds to the electric constant, ∈ c and ∈ a respectively correspond to the relative permittivity of the metal oxide in crystalline form and the relative permittivity of the metal oxide in amorphous form, C s0 corresponds to the total surface capacitance at zero field, γ c and γ a correspond to the quadratic coefficients of capacitance in function to the electric field of the metal oxide respectively in crystalline form and in amorphous form.