Patent ID: 7531862

Claim:
A semiconductor device comprising: a semiconductor substrate; an element separating insulating film formed within the silicon substrate; a first capacitor having a first capacitor lower electrode formed on the element separating insulating film, the lower electrode electrically connected only to ground, a first capacitor insulating film formed on the lower electrode of the first capacitor, and a first capacitor upper electrode formed on the first capacitor insulating film; an interlayer insulating film covering the entirety of the upper electrode of the first capacitor; a second capacitor in a serial electrical connection with the first capacitor, the second capacitor comprising a second capacitor lower electrode formed on the interlayer insulating film, a ferroelectric substance layer formed on the second capacitor lower electrode, and a second capacitor upper electrode of the second capacitor formed on the ferroelectric substance layer, the second capacitor upper electrode connected to a signal voltage; wherein the second capacitor is smaller than the first capacitor and is entirely within the cross-section of the first capacitor when viewed from above; wherein the second capacitor lower electrode is smaller than the first capacitor upper electrode; and wherein the first and second capacitors are formed on top and entirely within a cross-section of the element separating insulating film when viewed from above.