All-Digital Fast-Locking Delay-Locked Loop Using a Cyclic-Locking Loop for DRAM

Dong Hoon Jung, Young Jae An, Kyungho Ryu, Jung Hyun Park, Seong Ook Jung

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


A fast-locking all-digital delay-locked loop (DLL) with closed-loop duty-cycle correction (DCC) capability is proposed for clock synchronization in DRAM. A new cyclic-locking loop is proposed to resolve the locking speed degradation due to the replica delay line (RDL) in the DLL. The proposed cyclic-locking loop operates asynchronously and offers an optimal loop delay for DLL locking. The locking time of the proposed DLL is decreased by more than 34.1% compared to that of previous fast-locking DLLs using a successive approximation register algorithm. The proposed DLL is fabricated using 65-nm CMOS process technology on an active area of 465.1× 37μ m2 and uses a 1.1-V supply voltage. The operating frequency range is 400-800 MHz, and 3.52 mW is consumed at 800 MHz, resulting in a power consumption of 4.4 pJ/Hz. The measured locking time ranges from 38 to 41 cycles over the entire operating frequency range.

Original languageEnglish
Article number7156093
Pages (from-to)1023-1027
Number of pages5
JournalIEEE Transactions on Circuits and Systems II: Express Briefs
Issue number11
Publication statusPublished - 2015 Nov 1

Bibliographical note

Publisher Copyright:
© 2004-2012 IEEE.

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering


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