An energy efficient VPP generator with fast ramp-up time for mobile DRAM

Kyu Young Kim, Yonghwan Kim, Doo Chan Lee, Yu Ri Kang, Hoonki Kim, Soo Won Kim, Jongsun Park

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


An energy efficient VPP generator with fast ramp-up time for mobile DRAM is presented in this paper. Instead of using a fixed pumping clock frequency as in the conventional VPP generator, the proposed V PP generator adopts a voltage-controlled oscillator (VCO) and uses variable pumping frequencies to improve the ramp-up time as well as energy efficiency. Numerical results show that the VCO based VPP generators achieve energy savings of up to 34% with 40% improvement on ramp-up time when compared to the conventional ring oscillator (RO) based design. Our proposed VPP generator, which uses a three-stage voltage doubler as a charge pump, was implemented and fabricated in CMOS 0.13 μm process. The V PP generator chip's core occupies 0.6 mm2 area and consumes 1162 nJ (average power of 47.8 mW during 24 μs ramp-up time) while generating 3.0 V output voltage with 1.0 nF load capacitor, 2.0 mA current load and 1.2 V supply voltage.

Original languageEnglish
Article number5767518
Pages (from-to)1488-1494
Number of pages7
JournalIEEE Journal of Solid-State Circuits
Issue number6
Publication statusPublished - 2011 Jun

Bibliographical note

Funding Information:
Manuscript received April 17, 2010; revised October 02, 2010; accepted January 23, 2011. Date of current version May 25, 2011. This paper was approved by Associate Editor Sreedhar Natarajan. This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (No. K20902001448-10E0100-03010), Nano IP/Soc Promotion Group of Seoul R&BD Program (10920), and Hynix Semiconductor Inc.


  • Charge pump
  • V generator
  • mobile DRAM
  • voltage controlled oscillator
  • voltage doubler

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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