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Yeonbae CHUNG Jung-Hyun KIM Jae-Eun YOON
This paper proposes a new FeRAM design style based on grounded-plate PMOS-gate (GPPG) cell structure. A GPPG cell consists of a PMOS access transistor and a ferroelectric capacitor. Its plate is grounded. The proposed scheme employs three novel operating methods: 1) VDD precharged bitline, 2) negative-voltage wordline technique and 3) negative-pulse restore. Because this configuration doesn't need the on-pitch plate control circuitry, it is effective in realizing cost-effective chip sizes. Implementation of a 2.5-V, 2-Mb FeRAM prototype design in a 0.5-µm technology shows a cell array efficiency of 57%, an access time of 85 ns and an active current of 12 mA, respectively.