Laser Trimmer
In this process, a laser cuts into the resistor and thus increases the resistance value.
- LASER SYSTEMS GmbH - 4032
Laser trimming is a process to adjust (to trim) resistors of thick-film circuits.
The resistor material is screen printed and sintered (burned-in). During this process, high tolerances are encountered. By cutting the resistor material with a focussed laser beam, the conducting cross-section of the resistor is reduced. Thus, the electrical resistance increases. During the design process, tolerances of the manufacturing process are to be taken into account. Since this process can only be applied if the original electrical resistance is lower, every resistor is designed with a lower value.
It is also possible to perform an active trimming cycle. Thereby, any measurable value of the electronic circuit can be used for trimming. For example, you can measure an electrical voltage to actively trimm the gain of an amplifier.
For laser trimming, the laboratory uses the laser trimming system 4032 of LASER SYSTEMS GMBH.
