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question about advancements in DRAM

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legendkiller

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http://www.emrl.de/imagesArticles/DRAM_Emulation_Fig2.jpg

I was studying about DRAMs and was wondering whether the DDR2 ram and other types of DRAM still use the same cell design as the memory element(a transistor with a capacitor) or have DRAMs advanced beyond the primitive design. I have heard my professor talking about replacing the capacitor also with a FET utilizing its junction capacitance. Could some one shed some light on this.

I am also looking to simulate a simple DRAMcell using virtuoso or spice. Any info on this would be appreciated
 

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