Layout of composite circuit elements

摘要

Physical layouts of ratioed circuit elements, such as transistors, are disclosed. Such layouts can maintain electrical characteristics of the ratioed circuit elements relative to one another in the presence of mechanical stresses applied to an integrated circuit, such as an integrated circuit encapsulated in plastic. The ratioed circuit elements can include first and second composite circuit elements formed of first and second groups of circuit elements, respectively, arranged around a center point. The first group of circuit elements can be arranged on a grid and the second group of circuit elements can include four circuit elements spaced approximately the same distance from the center point. Each of the circuit elements in the second group can be off the grid in at least one dimension. The first and second groups of circuit elements can be arranged around a perimeter of dummy circuit elements in some embodiments.

主权项

1. An apparatus comprising:
a first group of circuit elements on an integrated circuit arranged around a center point, the first group of circuit elements configured to function as a first composite circuit element having a first area, the first group of circuit elements being arranged on a two-dimensional grid; and a second group of circuit elements on the same integrated circuit arranged around the same center point, the second group of circuit elements configured to function as a second composite circuit element having a second area, the second group of circuit elements comprising four circuit elements spaced approximately the same distance from the center point, and each of the four circuit elements in the second group of circuit elements being off the grid in at least one dimension; wherein no circuit elements from the first group of circuit elements or the second group of circuit elements are disposed over the center point; and wherein a circuit on the same integrated circuit that includes the first group of circuit elements and the second group of circuit elements is configured to function based on a ratio of the first area to the second area, and wherein the first area is at least two times bigger than the second area.