A 0.0043-mm2 0.085-μW/MHz Relaxation Oscillator Using Charge-Prestored Asymmetric Swings R-RC Network
A 0.0043-mm2 0.085-μW/MHz Relaxation Oscillator Using Charge-Prestored Asymmetric Swings R-RC Network
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DOI：
10.1109/tvlsi.2023.3244549
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Qiang Li
中科院分区：
文献类型：
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作者：
Yuchen Wei;Shiheng Yang;Yueduo Liu;Rongxin Bao;Zihao Zhu;Jiahui Lin;Zehao Zhang;Yong Chen;Jun Yin;Pui-In Mak;Qiang Li
In this brief, a charge-prestored 21.2-MHz relaxation oscillator is proposed for ultralow-power applications. It occupies only 0.0043 mm2 in 0.18- $mu text{m}$ CMOS by resistor reusing and is reference-free. The simulated temperature coefficient (TC) of the output frequency is 15.2 ppm/° from −30 °C to 125 °C. By generating an asymmetric capacitor charging swing, our charge-prestored technique reduces significantly the power consumed by the swing-boosting RC network during the charging phase. Also, the R- RC structure further improves the energy efficiency. The total power consumption of the oscillator core is $1.806 mu text{W}$ at 0.8 V, corresponding to an energy efficiency of $0.085 mu text{W}$ /MHz that compares favorably with the state of the art.
