Quantitative analysis of resistance of printed resistors

2nd International IEEE Conference on Polymers and Adhesives in Microelectronics and Photonics. POLYTRONIC 2002. Conference Proceedings (Cat. No.02EX599) Pub Date : 2002-08-07 DOI:10.1109/POLYTR.2002.1020213

P. L. Cheng, T. W. Law, Chenmin Liu, I. Chong, D. Lam

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引用次数: 7

Abstract

Surface-mounted resistors on an electronic circuit board are inexpensive and accurate, but resistors embedded in circuit boards can attain the same accuracy only after costly post-deposition trimming. Improved low cost methodologies of resistor fabrication are needed for cost effective embedding of resistors into polymeric substrates. Polymer Thick Film Resistors (PTFRs) are low temperature processable, low cost resistors with a wide resistivity range. The electrical resistance variation of these resistors is approximately /spl plusmn/10% after deposition and additional trimming procedure to tune the resistances to meet specifications. This adds to the cost and complicates the fabrication process when the resistors are embedded. In this study, the influences of PTFRs geometries on the resistance tolerances were investigated. Results indicated that the accuracy of stencil printed resistors was markedly higher than the screen-printed resistors. The screen-printed resistor edge geometries were observed to be rough. FEM analyses revealed that the resistance tolerances were associated with edge roughness. Remedies to the variations were proposed and the relationship between resistance tolerances and aperture orientations was also outlined.

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印刷电阻电阻的定量分析

电子电路板上表面安装的电阻器价格低廉且精度高，但嵌入电路板中的电阻器只有经过昂贵的沉积后修整才能达到同样的精度。为了在聚合物衬底中有效地嵌入电阻器，需要改进低成本的电阻器制造方法。聚合物厚膜电阻器(ptfr)是一种低温可加工、低成本、电阻率范围宽的电阻器。这些电阻器的电阻变化在沉积和额外的修剪程序以调整电阻以满足规格后约为/spl + /10%。当电阻器嵌入时，这增加了成本并使制造过程复杂化。在这项研究中，研究了ptfr的几何形状对电阻公差的影响。结果表明，网印电阻器的精度明显高于网印电阻器。观察到丝网印刷电阻边缘几何形状粗糙。有限元分析表明，阻力公差与边缘粗糙度有关。提出了补救措施，并概述了电阻公差与孔径取向之间的关系。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2nd International IEEE Conference on Polymers and Adhesives in Microelectronics and Photonics. POLYTRONIC 2002. Conference Proceedings (Cat. No.02EX599)

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