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Split-Folded Resistor

IP.com Disclosure Number: IPCOM000044227D
Original Publication Date: 1984-Nov-01
Included in the Prior Art Database: 2005-Feb-05
Document File: 2 page(s) / 96K

Publishing Venue

IBM

Related People

Bartley, GK: AUTHOR [+2]

Abstract

Low value resistors designed using thin film resistor technologies in the past occupy a substantial amount of the top surface of multichip modules. The thin film resistor in Fig. 1 occupies a surface area of fifteen grid points 10 which are spaced 1 millimeter from each other. This is not efficient utilization of the top surface area of multichip modules. The same resistor occupying only nine grid points 10 using a split-folded design is shown in Fig. 2. It should be noted that if the resistor were simply folded, the process of trimming would be more complex. A laser used for trimming would have to follow the material around corners and this requires exact alignment relative to both axes.

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Split-Folded Resistor

Low value resistors designed using thin film resistor technologies in the past occupy a substantial amount of the top surface of multichip modules. The thin film resistor in Fig. 1 occupies a surface area of fifteen grid points 10 which are spaced 1 millimeter from each other. This is not efficient utilization of the top surface area of multichip modules. The same resistor occupying only nine grid points 10 using a split-folded design is shown in Fig. 2. It should be noted that if the resistor were simply folded, the process of trimming would be more complex. A laser used for trimming would have to follow the material around corners and this requires exact alignment relative to both axes. Although the split-folded resistor has contacts S1 and S2, which are closer to the trim edges than the ground rules normally permit, the first plunge opens the first segment of the resistor and it does not matter if the contact is cut. Fig. 3 shows a trim slope for a typical split-folded resistor. It is important to note that no discontinuities occur when changing from the first to the second plunge on the split-folded design. The split-folded resistor is comparable in trim range and trim slope relative to the traditional design shown in Fig. 1. The split-folded resistor provides the ability to incorporate more resistors into a multichip module, and this reduces the need for external resistor packs. Additionally, when more resistors are not needed, the top...