Laser trimming is the process of modifying the current path through a resistor with the laser beam. This is accomplished by changing the shape of the resistor and essentially reducing width and adding length to the path the current will travel. There are a number of standard trim patterns or types used, dependent on the design of the resistor.

Trimming can be either "passive" or "active." Passive trimming is accomplished while monitoring the resistance with a measurement device and stopping the trim at a specific desired resistance value or percentage deviation from that desired value. Active trimming is accomplished while the circuit is "powered up" and a specific circuit parameter is being monitored, such as voltage, current, frequency, phase, etc. In this case, the laser beam may be trimming a resistor or capacitor, cutting conductor links, or a combination of all these techniques.

Applied Laser Technology® is an exclusive provider of embedded component laser trimming services for the PCB industry. This process requires dedicated laser equipment and specially developed trimming techniques. We are working closely with a number of leading manufacturers and material suppliers in the industry to develop this technology for large-scale production. A more detailed description of this service is available in an ALT download. Also, for additional information on the technology, and on the advantages of a jobshop service, follow this link. Click your browser BACK button to return to this page.