An area-efficient, 0.022-mm2, fully integrated resistor-less relaxation oscillator for ultra-low power real-time clock applications
An area-efficient, 0.022-mm2, fully integrated resistor-less relaxation oscillator for ultra-low power real-time clock applications
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适用于超低功耗实时时钟应用的面积高效、0.022mm2、完全集成的无电阻张弛振荡器
DOI：
10.1109/iscas.2017.8050350
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Numa M.
中科院分区：
文献类型：
--
作者：
Asano H.;Hirose T.;Ozaki T.;Kuroki N.;Numa M.
在本文中，我们提出了一个完全集成和面积效率的无电阻弛张振荡器（ROSC）的超低功耗实时时钟（RTC）的应用。所提出的ROSC基于传统的ROSC并修改为面积高效的电路配置，无需使用电阻器。该ROSC由偏置电流源、与绝对温度成比例（PTAT）电压源、电流模式ROSC、并联稳压器和输出逻辑电路组成。PTAT电压源和关断调节器用于补偿ROSC的温度特性。通过在65 nm CMOS工艺中实施我们提出的ROSC，面积为0.022 mm 2。仿真结果表明，我们提出的ROSC产生32.5 kHz的时钟频率，并实现271 nW的超低功耗。振荡频率的温度和电压依赖性分别为138 ppm/°C和13.9ppm/mV。Monte Carlo统计模拟表明，平均值，标准差和变异系数分别为32.3 kHz，0.6 kHz和1.9%。
In this paper, we propose a fully integrated and area-efficient resistor-less relaxation oscillator (ROSC) for ultra-low power real-time clock (RTC) applications. The proposed ROSC is based on a conventional ROSC and modified to be area-efficient circuit configuration, without using resistors. The proposed ROSC consists of a bias current source, proportional to absolute temperature (PTAT) voltage source, current mode ROSC, shunt regulator, and output logic circuit. The PTAT voltage source and shut regulator are used to compensate for the temperature characteristics of the ROSC. By implementing our proposed ROSC in a 65-nm CMOS process, the area was 0.022 mm2. Simulated results demonstrated that our proposed ROSC generates 32.5-kHz clock frequency and achieves ultra-low power dissipation of 271 nW. The temperature and voltage dependences of the oscillation frequency were 138ppm/°C and 13.9ppm/mV, respectively. Monte Carlo statistical simulations showed that the mean, standard deviation, and the coefficient of variation are 32.3 kHz, 0.6 kHz, and 1.9%, respectively.