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In-Situ-Blending of Inkjet-Printed Resistors
Keywords: RC-Circuit, Inkjet, Vertical Integration
Thick-film resistors are widely used passive components. Taking account of circuit design and layout, decoupling the resistance from geometry is desirable. Inkjet printing offers an approach to achieve this aim by allowing for in-process blending of resistor inks. To model the electric behavior of printed resistors, a conductance-based linear model is derived that is both physically plausible and mathematically convenient. Generally, the model is based on resistor layers connected in parallel. To allow for fine graduation, the parallel layers are not merely realized with different decadic inks, but with a discrete number of ink mixtures (“virtual inks”) which are generated in-situ during printing. Both the conductance model and the in-process ink blending are proven by real inkjet-printed resistors. To manufacture these resistors, the inkjet printing system used was improved.
Dietrich Jeschke,
University of the Federal Armed Forces
Hamburg, Hamburg

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