A 3T gain cell embedded DRAM utilizing preferential boosting for high density and low power on-die caches

Ki Chul Chun, Pulkit Jain, Jung Hwa Lee, Chris H. Kim

Research output: Contribution to journalArticlepeer-review

55 Scopus citations

Abstract

Circuit techniques for enabling a sub-0.9 V logic-compatible embedded DRAM (eDRAM) are presented. A boosted 3T gain cell utilizes Read Word-line (RWL) preferential boosting to increase read margin and improve data retention time. Read speed is enhanced with a hybrid current/voltage sense amplifier that allows the Read Bit-line (RBL) to remain close to VDD. A regulated bit-line write scheme for driving the Write Bit-line (WBL) is equipped with a steady-state storage node voltage monitor to overcome the data 1 write disturbance problem of the PMOS gain cell without introducing another boosted supply for the Write Word-line (WWL) over-drive. An adaptive and die-to-die adjustable read reference bias generator is proposed to cope with PVT variations. Monte Carlo simulations compare the 6-sigma read and write performance of proposed eDRAM against conventional designs. Measurement results from a 64 kb eDRAM test chip implemented in a 65 nm low-leakage CMOS process show a 1.25 ms data retention time with a 2 ns random cycle time at 0.9 V, 85°C, and a 91.3 μW per Mb static power dissipation at 1.0 V, 85°C.

Original languageEnglish (US)
Article number5763722
Pages (from-to)1495-1505
Number of pages11
JournalIEEE Journal of Solid-State Circuits
Volume46
Issue number6
DOIs
StatePublished - Jun 1 2011

Keywords

  • 3T gain cell
  • Cache
  • logic-compatible eDRAM
  • low-power
  • low-voltage

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