This paper describes an active catheter with flexible polyimide-based integrated CMOS interface circuits for communication and control (C&C IC) to be used for applications in biomedicine. The active catheter has a multilink structure and distributed micro Shape Memory Alloy (SMA) coils are utilized as actuators for multi-degree of freedom movement. The C&C ICs are incorporated within the links and require three common lead wires to address all the links and control the selected SMA actuators in the active catheter. A MOS transistor with large channel width is used for switching the SMA actuator. To reduce system size and simplify assembly work, the C&C circuit and three lead wires are fabricated on the same substrate using a CMOS-compatible polyimide-based process. The outer diameter of the fabricated active catheter is approximately 2.0 mm. The fabricated C&C IC measures 1.0 mm x 3.35 mm X 0.2 mm. The link addressing and the actuator switching functions of the fabricated chip were confirmed. The minimum access time for addressing and actuating a single unit was 6.4 ps. The active catheter was actuated by the fabricated C&C IC chip with flexible interconnect leads in response to the C&C signals from the outside controller.
A new 64-cell NAND flash memory with asymmetric S/D (Source/Drain) structure for sub-40nm node technology and beyond has been successfully developed. To suppress short channel effect in NAND memory cell, asymmetric S/D consisting of optimized junction and inversion layer induced by fringe field of WL bias which is applied at NAND operation conditions is successfully utilized. 64-cell NAND string which is double number of cells used in current NAND string is also used to further reduce bit cost by achieving over 10% chip size reduction while almost maintaining MLC (Multi-Level-Cell) NAND performance requirements.
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