1-3hit |
Min-Chul SUN Hyun Woo KIM Sang Wan KIM Garam KIM Hyungjin KIM Byung-Gook PARK
As an add-on device option for the ultra-low power CMOS technology, the double-gated vertical-channel Tunnel Field-Effect Transistors (TFETs) of different source configurations are comparatively studied from the perspectives of fabrication and current drivability. While the top-source design where the source of the device is placed on the top of the fin makes the fabrication and source engineering much easier, it is more susceptible to parasitic resistance issue. The bottom-source design is difficult to engineer the tunneling barrier and may require a special replacement technique. Examples of the schemes to engineer the tunneling barrier for the bottom-source TFET are suggested. A TCAD simulation study on the bottom-source devices shows that both the parasitic resistance of source region and the current enhancement mechanism by field coupling need be carefully considered in designing the source.
Yasuo SATO Iwao YAMAZAKI Hiroki YAMANAKA Toshio IKEDA Masahiro TAKAKURA Kazuhiko IWASAKI
Although open defects are hard to diagnose because they are unstable, we developed a technique to diagnose completely open defects. We applied a new "segment model" that takes the coupling effects on a defective node that are caused by neighboring nodes into consideration. This technique is used to focuse not only on the behavior of the defective node, but also on the behavior of other nodes affecting its behavior. We explain the theoretical treatment of our model and present experimental results obtained from an actual chip.
Jingyu XU Xianlong HONG Tong JING Yici CAI Jun GU
As the CMOS technology enters the very deep submicron era, inter-wire coupling capacitance becomes the dominant part of load capacitance. The coupling effects have brought new challenges to routing algorithms on both delay estimation and optimization. In this paper, we propose a timing-driven global routing algorithm with consideration of coupling effects. Our two-phase algorithm based on timing-relax method includes a heuristic Steiner tree algorithm to guarantee the timing performance of the initial solution and an optimization algorithm based on coupling-effect-transference. Experimental results are given to demonstrate the efficiency and accuracy of the algorithm.