An ilp-based routing algorithm for pin-constrained EWOD chips with obstacle avoidance

Jia Wen Chang, Sheng Han Yeh, Tsung Wei Huang, Tsung Yi Ho

Research output: Contribution to journalArticlepeer-review

Abstract

Electrowetting-on-dielectric (EWOD) chips have become the most popular actuators, particularly for droplet-based digital microfluidic biochip (DMFB) systems. In order to enable the electrical manipulations, wire routing is a key problem in designing EWOD chips. Unlike traditional very-large-scale-integration (VLSI) routing problems, in addition to routing-path establishment on signal pins, the pin-constrained EWOD-chip routing problem must address the issue of signal sharing for pin-count reduction under a practical constraint posed by a limited pin-count supply. Moreover, EWOD-chip designs might incur several obstacles in the routing region due to embedded devices for specific fluidic protocols. However, no existing work considers the EWOD-chip routing with obstacles and, therefore, lots of manual design efforts are involved. To remedy this insufficiency, we propose in this paper the first routing algorithm for pin-constrained EWOD chips with obstacle avoidance. The proposed algorithm, based on effective integer-linear-programming (ILP) formulation as well as efficient routing framework, can achieve high routability with a low design complexity. Experimental results based on real-life chips with obstacles demonstrate the high routability of proposed algorithm for pin-constrained EWOD chips with obstacle avoidance.

Original languageEnglish (US)
Article number6634553
Pages (from-to)1655-1667
Number of pages13
JournalIEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems
Volume32
Issue number11
DOIs
StatePublished - Nov 4 2013
Externally publishedYes

Keywords

  • Digital microfluidic biochips
  • Integer linear programming
  • Pin-constrained
  • Routing

ASJC Scopus subject areas

  • Software
  • Computer Graphics and Computer-Aided Design
  • Electrical and Electronic Engineering

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