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A ferroelectric capacitor overdrive with shield-bitline drive for 1.3 V chain FeRAM has been verified using a 0.13 ??m 576 Kb test chip with 0.719 ??m2 cell. This technique applies 0.24 V bias to ferroelectric capacitors without increasing stress and bitline capacitance. The measured tail-to-tail cell signal is improved by 100 mV and doubled in 1.3 V array operation.
An application that takes advantage of FeRAM characteristics is replacing current DRAM, which then becomes high-performance nonvolatile RAM cache. This improves system performance for many kinds of computer systems, including mobile PCs, cellular phones, digital video products, and storage systems such as SSDs. However, the highest capacity in nonvolatile RAMs that allow frequent cache reads and writes...
Novel cell technologies are successfully developed for the world's highest-density and highest-speed 128 Mb chain FeRAMtrade with SDRAM-compatible 1.6 GByte/s DDR2 interface. To overcome the signal window reduction due to the capacitor shrinkage, new cell technologies such as half-pitch layout with triangular capacitors, advanced nestled chain structure, high-density cover film and low-damage etching...
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