Patent ID: 7106619

Claim:
An integrated circuit comprising: a first dopant-type semiconductor substrate having a logic portion and a memory portion thereon, the logic portion having at least 30K logic gates and having a layout on the substrate that need not be constrained by the physical dimensions of the layout of the memory portion on the substrate, the memory portion coupled to the logic portion through a data interface, the memory portion having a capacity of at least 2 megabits and the data interface being at least 128 bits wide, and a capacitor having a first dopant-type transistor in a second dopant-type well in the first dopant-type semiconductor substrate, the first dopant-type transistor having a gate, first and second source/drains, the first source/drain connected in common to the second source/drain to form a first terminal of the capacitor, the gate forming a second terminal of the capacitor, the second dopant-type well connected to a first voltage supply line, and the substrate connected to a second voltage supply line, different voltages applied to the first voltage supply line and to the second voltage supply line, such that the semiconductor junction between the second dopant-type well and the substrate is reverse-biased; whereby the capacitor is isolated from electrical noise in the substrate.