1. James Watt School of Engineering, Microelectronics Lab, University of Glasgow, Glasgow, U.K.
2. Institute of Electrical Engineering and Information Technology, Christian-Albrechts-University of Kiel, Kaiserstraße 2, Kiel, Germany
3. Fraunhofer Institute for Silicon Technology ISIT, Itzehoe, Germany
4. School of Engineering and the Biosciences Research Institute, Newcastle University, Newcastle upon Tyne, U.K.