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Micromachines 2011, 2(4), 369-384; doi:10.3390/mi2040369
Article

Nonlinear Dual-Phase Multiplexing in Digital Microfluidic Architectures

, , , ,  and *
School of Engineering, University of British Columbia, Kelowna, BC V1V1V7, Canada
* Author to whom correspondence should be addressed.
Received: 17 August 2011 / Revised: 20 September 2011 / Accepted: 20 September 2011 / Published: 28 September 2011
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Abstract

A 16 × 16 digital microfluidic multiplexer is demonstrated. The device makes use of dual-phase AC activation in a bi-layered electrode structure for actuating microdrops independently. A switching arrangement is employed to localize two out-of-phase AC waveforms in one overlapped region of the two-dimensional multiplexer grid. The superimposed AC waveforms overcome the threshold voltage for motion of a local microdrop. The demonstrated dual-phase activation and nonlinear threshold-based motion overcomes the previously-reported microdrop interference effect, as it successfully actuates individual microdrops in systems with multiple neighbouring microdrops. The device is demonstrated with an integrated centre-tap transformer using a 10.0 Vrms input voltage and minimal power consumption.
Keywords: digital microfluidic; cross-referencing; bi-polar voltage; threshold voltage digital microfluidic; cross-referencing; bi-polar voltage; threshold voltage
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Collier, C.M.; Wiltshire, M.; Nichols, J.; Born, B.; Landry, E.L.; Holzman, J.F. Nonlinear Dual-Phase Multiplexing in Digital Microfluidic Architectures. Micromachines 2011, 2, 369-384.

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