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1.2 MHz relaxation oscillator with 16.8 ppm/°C temperature coefficient using resistive self-bias current

1.2 MHz relaxation oscillator with 16.8 ppm/°C temperature coefficient using resistive self-bias current

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In this research, the authors propose a self-biased relaxation oscillator that outputs a constant 1.2 MHz clock over a wide temperature range. Excluding any external bias, the proposed oscillator embodies a self-bias circuit that generates a bias current from a precisely trimmed resistor. To minimise the power consumption, a switched-bias technique was applied to the two comparators in the oscillator. The proposed circuit was fabricated in a 180 nm CMOS process. It consumes 17.9 µW from a 1.5 V supply, and its temperature coefficient is 16.8 ppm/°C in the range of −20–80°C.

References

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    2. 2)
      • 2. Koo, J., Moon, K., Kim, B., et al: ‘A quadrature relaxation oscillator with a process-induced frequency-error compensation loop’. Int. Solid-State Circuits Conf. (ISSCC), San Francisco, CA, USA, February 2017, pp. 9495.
    3. 3)
      • 3. Cao, Y., Leroux, P., Cock, W., et al: ‘A 63,000 Q-factor relaxation oscillator with switched-capacitor integrated error feedback’. Int. Solid-State Circuits Conf. (ISSCC), San Francisco, CA, USA, February 2013, pp. 186187.
http://iet.metastore.ingenta.com/content/journals/10.1049/el.2018.7821
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