Chr. Werner

Learn More
This paper presents simulation results for crosstalk noise in future CMOS generations down to 35 nm features. The noise oltage is calculated from circuit simulations with lumped RLC networks and static CMOS cells. A static noise margin is derived from inverter characteristics of NAND and NOR gates and a critical wire length is calculated from considering(More)
Practical simulation and measurement methods based on impulse sensitivity functions to characterize the sampling aperture of clocked comparators are demonstrated on a 90nm CMOS testchip. The results comparing a StrongARM latch and a CML latch suggest that the StrongARM latch has a narrower aperture of 23ps but its aperture center is more sensitive to supply(More)
To evaluate system parameters in PET measurements, several different activity ratios of the investigated phantom must be analyzed. The aim of this study was to develop a measurement protocol which requires just one filling of the phantom to measure adequate image contrasts and count ranges. We used 11C for the hollow spheres and 18F for the background of(More)
The aim of this study was to analyze the recommended OSEM image reconstruction parameters in positron emission tomography (PET). Spatial resolution, signal-to-noise ratio, and contrast were used as physical figures of merit (FOM). For statistical FOMs, the t-value and the area under the receiver operating characteristic (ROC) were employed. The spatial(More)
  • 1