2nd generation embedded DRAM with 4X lower self refresh power in 22nm Tri-Gate CMOS technology

Abstract

2nd generation 1Gbit 2GHz Embedded DRAM (eDRAM) with 4X lower self refresh power compared to prior generation is developed in 22nm Tri-Gate CMOS technology. Retention time has been improved by 3X (300us@95°C) by process and design optimizations. Source synchronous clocking is integrated in the design to reduce clock power without penalizing bandwidth. Charge pump power is reduced by 4X by employing comparator based regulation. Temperature controlled refresh enables minimum refresh power at all temperature conditions.