An ultra low-power digitally controlled oscillator using novel Schmitt-trigger based hysteresis delay cells
An ultra low-power digitally controlled oscillator using novel Schmitt-trigger based hysteresis delay cells
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DOI：
10.1587/elex.8.589
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
Nasser Erfani Majd;M. Lotfizad;M. Ghaznavi‐Ghoushchi;A. Abadian
中科院分区：
文献类型：
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作者：
Nasser Erfani Majd;M. Lotfizad;M. Ghaznavi‐Ghoushchi;A. Abadian
提出了一种超低功耗15位数字振荡器(DCO)。所提出的DCO是基于分段粗调阶段设计的，在精调阶段采用了新颖的基于施密特触发器的滞环延迟单元(HDC)和数字控制变容二极管(DCV)。利用TSMC180 nm模型对所提出的数字振荡器进行了仿真，得到了191 MHz∼850 MHz的可控频率范围和宽线性度。蒙特卡罗模拟结果表明，在电源电压为1.8V、频率为215 MHz时，电源随机波动引起的时间周期抖动小于124.8ps，功耗为137µW。
In this paper, an ultra low power 15-bit digitally controlled oscillator (DCO) is proposed. The proposed DCO is designed based on a segmental coarse-tuning stage which employs novel Schmitt-trigger based hysteresis delay cells (HDC) as well as digitally controlled varactor (DCV) in the fine-tuning stage. Simulation of the proposed DCO using TSMC 180nm model achieves controllable frequency range of 191MHz ∼ 850MHz with a wide linearity. Monte Carlo simulation demonstrates that the time-period jitter due to random power supply fluctuation is under 124.8ps and the power consumption is 137µW at 215MHz with 1.8V power supply.