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A 31 ns Random Cycle VCA T-Based 4F 50DRAM With Manufacturability and Enhanced C
基于堆栈电容和环绕栅垂直通道晶体管的4F²/50DRAM实现高性能与可制造性
80nm设计规则,随机周期时间31ns,读取延迟8ns
4F²/50DRAMVCAT堆栈电容混合位线感应放大器随机周期时间
▸创新点1:高性能VCAT晶体管(方法创新) - 采用环绕栅垂直通道晶体管(VCA T)技术,相比传统凹槽通道晶体管(RCA T),其导通电流提高两倍以上,显著提升了DRAM的Ion-Ioff特性,为高速操作奠定基础。
▸创新点2:4F²/50单元阵列设计方法(系统创新) - 通过核心块重构、字线(WL)绑定和混合位线(BL)感应放大器方案,实现了高密度4F²/50 DRAM单元阵列,相比传统6F²设计节省29%的核心阵列面积,同时兼顾制造可行性和性能优化。
▸创新点3:混合位线感应放大器方案(电路创新) - 结合动态操作特性设计的混合感应放大器架构,将随机循环时间(tRC)缩短至31ns,读取延迟(tRCD)降低至8ns,显著提升DRAM的访问速度与能效比。
▸创新点4:高温稳定性优化(工艺创新) - 在90°C动态操作条件下,88Kb样本阵列的中位保持时间达到30秒,通过堆叠电容器与VCAT技术组合,增强了高温环境下的数据保留能力。
Abstract
A functional 4F /50DRAM was implemented based
on the technology combination of stack capacitor and sur-
rounding-gate vertical channel access transistor (VCA T). A high
performance VCAT has been developed showing excellent Ion-Ioff
characteristics with more than twice turn-on current compared
with the conventional recessed channel access transistor (RCAT).
A new design methodology has been applied to accommodate
4F
/50cell array, achieving both high performance and manufac-
turability. Especiall