Effects of varying laser trimming geometries on thin film resistors

Alafogianni, Maria, Birkett, Martin and Penlington, Roger (2017) Effects of varying laser trimming geometries on thin film resistors. Circuit World, 43 (1). pp. 27-31. ISSN 0305-6120

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Official URL: http://dx.doi.org/10.1108/CW-11-2016-0058


Purpose - This paper studies the effects of varying laser trim patterns on several performance parameters of thin film resistors such as the temperature coefficient of resistance (TCR) and target resistance value.

Design/methodology/approach - The benefits and limitations of basic trim patterns are taken into consideration and the plunge cut, double plunge cut and the curved L-cut were selected to be modelled and tested experimentally. A computer simulation of the laser trim patterns has been developed for the modelling process of the resistors. The influence of the trim length and resistor dimensions on the TCR performance and resistance value of the resistors is

Findings - It is found that variation in trim length, within the range of 5 to 15 mm, can give significant increases in the TCR of the thin films. Thus, for the plunge TCR cut can reach up to 11.51 ppm/oC, for the double plunge cut up to 14.34 ppm/oC and for the curved L-cut up to 5.11 ppm/oC.

Originality/value – Research on the effects of various laser trimming geometries on the TCR and target resistance accuracy is limited, especially for patterns such as the curved L-cut,which is investigated in this paper.

Item Type: Article
Uncontrolled Keywords: optimization, laser trimming process, thin film resistor
Subjects: H300 Mechanical Engineering
Department: Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: Dr Martin Birkett
Date Deposited: 06 Feb 2017 10:14
Last Modified: 01 Aug 2021 08:21
URI: http://nrl.northumbria.ac.uk/id/eprint/29486

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