IEICE Electronics Express
Online ISSN : 1349-2543
A wide-range and fast-locking all digital SARDLL for DVFS SoCs
Tai-Long XuFeng XueZhi-Kuang CaiXian-He GaoXue-You HuChang-Jun ZhaYu-Feng XuJun-Ning Chen
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2015 Volume 12 Issue 12 Pages 20150284


A wide-range and fast-locking all digital successive approximation register-controlled delay-locked loop (SARDLL) is presented for dynamic voltage/frequency scaling (DVFS) system-on-chips (SoCs). The proposed SARDLL eliminates the harmonic lock problem and zero-delay trap problem by using the improved resettable digitally controlled delay line (DCDL) and shortens the lock time by adopting the 2-b successive-approximation-register (SAR) algorithm. The proposed 6-bit SARDLL is designed using the TSMC 65 nm CMOS low power cell library. The layout’s active area is 91 µm × 91 µm. The post-layout simulation results show that the proposed SARDLL can operate from 250 MHz to 2 GHz. Its lock time is constant 9 cycles of the input clock. The power consumption is estimated to be 0.72 mW at 1.2 V supply voltage and 2-GHz clock frequency.

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© 2015 by The Institute of Electronics, Information and Communication Engineers
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