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Low-power Temperature-insensitive Timer

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Timer transient.png
Timer circuit.png


The rapid growth of the internet of things leads to high demand for the continuous monitoring of environmental and biomedical signals. To satisfy the requirement for duty-cycled wireless IoT devices, the timer needs to be precise and low-power. Conventional crystal-based timer is bulky. RC-based timer is a good alternative that can be integrated on-chip [1][2][3]. Capacitors are relatively insensitive to temperature change, so it is critical to control the resistors to achieve temperature-stable timer.

In this project, the student will: 1. Study prior art 2. Characterizing on-chip resistors 3. Exploring and developing novel on-chip timer

Status: Completed

Looking for master or semester thesis students
Supervisor: Jiawei Liao,Giorgio Cristiano


  • AIC
  • VLSI


  • 20% Literature review
  • 20% Theory
  • 30% Device characterization
  • 30% Design and simulation


Prof. Taekwang Jang <>


[1] T. Jang, M. Choi, S. Jeong, S. Bang, D. Sylvester, and D. Blaauw, “5.8 A 4.7nW 13.8ppm/°C self-biased wakeup timer using a switched-resistor scheme,” in 2016 IEEE International Solid-State Circuits Conference (ISSCC), Jan. 2016, pp. 102–103. doi: 10.1109/ISSCC.2016.7417927.

[2] G. Cristiano, J. Liao, A. Novello, G. Atzeni, and T. Jang, “A 8.7ppm/°C, 694nW, One-Point Calibrated RC Oscillator using a Nonlinearity-Aware Dual Phase-Locked Loop and DSM-Controlled Frequency-Locked Loops,” in 2020 IEEE Symposium on VLSI Circuits, Jun. 2020, pp. 1–2. doi: 10.1109/VLSICircuits18222.2020.9162838.

[3] M. Ding, M. Song, E. Tiurin, S. Traferro, Y.-H. Liu, and C. Bachmann, “A 0.9pJ/cycle 8ppm/oC DFLL-based Wakeup timer Enabled by a Time-Domain Trimming and An Embedded Temperature Sensing,” p. 2.

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Practical Details