Patent ID: 7091548

Claim:
An analog capacitor comprising: a) a lower capacitor electrode; b) an upper capacitor electrode facing the lower capacitor electrode, wherein the lower capacitor electrode is at least one first conductive layer and the upper capacitor electrode is at least one second conductive layer, wherein each of the first and second conductive layers comprises a material selected from the group consisting of titanium (Ti), titanium nitride (TiN), tantalum (Ta), tantalum nitride (TaN), aluminum (Al), copper (Cu), tungsten (W), tungsten nitride (WN), iridium (Ir), iridium oxide (IrO 2 ), ruthenium (Ru), and ruthenium oxide (RuO 2 ); and c) at least three high-k dielectric layers interposed between the lower capacitor electrode and the upper capacitor electrode, the at least three high-k dielectric layers comprising: i) a bottom dielectric layer contacting the lower capacitor electrode; ii) a top dielectric layer contacting the upper capacitor electrode; and iii) a middle dielectric layer interposed between the bottom dielectric layer and the top dielectric layer, wherein each of the bottom dielectric layer and the top dielectric layer is a high-k dielectric layer having a relatively low absolute value of a quadratic coefficient of voltage coefficient of capacitance (VCC) thereof compared to that of the middle dielectric layer, and the middle dielectric layer is a high-k dielectric layer having a relatively low leakage current compared to those of the bottom dielectric layer and the top dielectric layer.