A pW-Power Hz-Range Oscillator Operating With a 0.3-1.8-V Unregulated Supply
A pW-Power Hz-Range Oscillator Operating With a 0.3-1.8-V Unregulated Supply
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DOI：
10.1109/jssc.2018.2886336
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发表时间：
2019-05-01
影响因子：
5.4
通讯作者：
Alioto, Massimo
中科院分区：
文献类型：
--
作者：
Aiello, Orazio;Crovetti, Paolo;Alioto, Massimo
本文提出了一种用于传感器节点应用的pW功率弛张振荡器。所提出的振荡器工作在从标称到深亚阈值的宽电源电压范围内，并且仅需要亚pF电容器11）r Hz范围的输出频率。由于采用了利用晶体管超截止操作的架构，消除了电压调节和电流基准，因此实现了真正的PW功率操作。实际上，振荡器可以直接从高度可变的电压源（例如，采集器和电池在它们的整个充电/放电循环中）。这得益于宽电源电压范围、输出频率的低电压灵敏度和从电源汲取的电流。在180 nm的建议振荡器的测试芯片表现出约4 Hz的标称频率，电源电压范围从1.8 V下降到0.3 V与10%/V的电源灵敏度，8 - 18-pA的电流吸收，和4%/C的热漂移从-20 °C至40 ° C的面积为1600 μ m（2）。据作者所知，所提出的振荡器是唯一一个能够从亚阈值工作到标称电压。
In this paper, a pW-power relaxation oscillator for sensor node applications is presented. The proposed oscillator operates over a wide supply voltage range from nominal down to deep sub-threshold and requires only a sub-pF capacitor 11)r Hz-range output frequency. A true pW-power operation is enabled thanks to the adoption of an architecture leveraging transistor operation in super-cutoff, the elimination of voltage regulation, and current reference. Indeed, the oscillator can be powered directly from highly variable voltage sources (e.g., harvesters and batteries over their whole charge/discharge cycle). This is achieved thanks to the wide supply voltage range, the low voltage sensitivity of the output frequency and the current drawn from the supply. A test chip of the proposed oscillator in 180 nm exhibits a nominal frequency of approximately 4 Hz, a supply voltage range from 1.8 V down to 0.3 V with 10%/V supply sensitivity, 8-18-pA current absorption, and 4%/ C thermal drift from -20 degrees C to 40 degrees C at an area of 1600 mu m(2). To the best of the authors' knowledge, the proposed oscillator is the only one able to operate from sub-threshold to nominal voltage.