Title :
A passive laser-trimming technique to improve the linearity of a 10-bit D/A converter
Abstract :
The development of a new laser-trim technique is described. Metal links, which are arranged to provide incremental adjustments to critical circuit parameters, are cut by a laser. Trimming operations are monitored and controlled by means of a computer program. A comparison is made between currently used trimming methods. An application, to improve the linearity of a 10-bit D/A converter, is described. This trimming technique, which is implemented so that its effects track temperature and reference current variations, allows the converter to be adjusted for better than /spl plusmn/0.05 percent linearity by appropriately modifying the ladder termination voltages.
Keywords :
Convertors; Digital-analogue conversion; Integrated circuit manufacture; Laser beam machining; Monolithic integrated circuits; convertors; digital-analogue conversion; integrated circuit manufacture; laser beam machining; monolithic integrated circuits; Integrated circuit yield; Laser beam cutting; Laser beams; Laser transitions; Linearity; Optical materials; Resistors; Thermal stresses; Thin film circuits; Voltage;
Journal_Title :
Solid-State Circuits, IEEE Journal of
DOI :
10.1109/JSSC.1976.1050819
