1. Integrated System Laboratory (LSI), School of Engineering, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
2. IMEC, Kapeldreef 75, B-3001 Leuven, Belgium
3. KU Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium
4. Laboratory of NanoIntegrated Systems (LNIS), Department of Electrical and Computer Engineering, University of Utah, Salt Lake City, Utah 84112, United States