MULTIPLE LASER TRIMMED RESISTORS
Original Publication Date: 1989-Aug-01
Included in the Prior Art Database: 2001-Nov-07
As circuit densities continue to increase, so does the desire to built in volumetric rather than planer man- ner. One area in which this may be feasible is in resistor networks used for biasing and padding. One of the main problems with multi-layer resistors is trimming the resistors on top and underneath without hurting the other. This can be controlled through the layout, making it possible to trim resistors independently or in a ratio to each other. Still more resistors can be stacked on to make pads that can be trimmed with a single laser cut, yet maintain their initial ratio.