FOX -Field Oxide
LOCOS - LOCal Oxidation of Silicon
STI -Shallow Trench Isolation
Lecture 2:Process and Layout
Page 10/64
The LOCOS Process has two problems:
» Bird’s Beak makes it hard to make transistors close to each other.
» A parasitic MOSFET can turn on underneath the FOX.
Solution: Shallow Trench Isolation (STI) and Field Implants