High Reliability Low-Cost Fuse Configuration
Original Publication Date: 1989-Apr-01
Included in the Prior Art Database: 2005-Jan-27
It is often necessary for certain parameters of sensitive integrated circuits to have tolerances tighter than the manufacturing process alone can give. Various techniques are used to obtain these tight tolerances such as sorting, laser trimming, programming, using high precision external components, "zener zapping" and fuse blowing. These measures often add considerable expense to a part because of the extra handling and equipment required. Blowing or "zapping" programmable fuses or links is one of the more economical methods but usually involves applying stressful voltages or currents to the part that may affect its reliability. Some trimming schemes require all parts to be trimmed. The circuit, when fabricated, is always skewed in a certain direction.