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A 300 nW 10 kHz Relaxation Oscillator with 105 ppm/\(^{\circ }\)C Temperature Coefficient

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Abstract

An on-chip nanopower RC relaxation oscillator is developed in a 180-nm standard CMOS process, consuming 300 nW while running at 10 kHz. Employing a frequency compensation scheme that reduces the frequency drift introduced by comparator offset and delay, the proposed oscillator achieves a significant low temperature coefficient. Furthermore, a supply regulation structure is used to reduce the frequency sensitivity to supply voltage variations. Post-simulation results show that the frequency variation against temperature is 105 ppm/\(^{\circ }\)C in the temperature range from 0 to 85 \(^{\circ }\)C, and the line sensitivity is 2.19%/V with the supply voltage changing from 1.05 to 1.45 V. At offset frequencies of 100 Hz and 1 kHz, the simulated phase noises are −50 and −71 dBc/Hz, respectively.

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Data Availability

The datasets generated and/or analyzed during the present study are available from the corresponding author on reasonable request.

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Acknowledgements

This work was supported in part by the National Natural Science Foundation of China under Grant No. 61704022 and 61871073, and by Science and Technology Project of Henan Province under Grant No.192102210086.

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Authors and Affiliations

  1. National Center for International Joint Research of Electronic Materials and Systems, School of Information Engineering, Zhengzhou University, Zhengzhou, 450001, China

    Cai-bo Li & Yao Wang

  2. College of Communication Engineering, Chengdu University of Information Technology, Chengdu, 610225, China

    Ben-qing Guo

  3. Key Laboratory of Grain Information Processing and Control, Ministry of Education, Zhengzhou, China

    Tian-fei Chen & Li-jun Sun

  4. Key Laboratory of Machine Perception and Intelligent System, College of Information Science and Engineering, Henan University of Technology, Zhengzhou, China

    Tian-fei Chen & Li-jun Sun

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  1. Cai-bo Li
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  2. Yao Wang
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  3. Ben-qing Guo
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  4. Tian-fei Chen
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  5. Li-jun Sun
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Correspondence to Yao Wang.

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Li, Cb., Wang, Y., Guo, Bq. et al. A 300 nW 10 kHz Relaxation Oscillator with 105 ppm/\(^{\circ }\)C Temperature Coefficient. Circuits Syst Signal Process 40, 5264–5279 (2021). https://doi.org/10.1007/s00034-021-01739-0

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  • DOI: https://doi.org/10.1007/s00034-021-01739-0

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