1. KU Leuven, Department of Electrical Engineering, ESAT, Kasteelpark Arenberg 10, Leuven 3001, BelgiumbInteruniversitair Micro Elektronica Centrum, Department of Logic Technologies, Kapeldreef 75, Heverlee 3001, Belgium
2. Interuniversitair Micro Elektronica Centrum, Department of Logic Technologies, Kapeldreef 75, Heverlee 3001, Belgium