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5-31-Hz 188-µW light-sensing oscillator with two active inductors fully integrated on plastic

journal contribution
posted on 2023-06-09, 18:09 authored by Tilo Meister, Koichi Ishida, Stefan Knobelspies, Giuseppe Cantarella, Niko Munzenrieder, Gerhard Tröster, Corrado Carta, Frank Ellinger
We present a low-power low-frequency oscillator that is fully integrated on a bendable plastic substrate using amorphous indium-gallium-zinc oxide (a-IGZO) thin-film transistors (TFTs). Its purpose is the duty cycling of components of a wireless sensor tag to realize power savings. In addition, the oscillator can directly be used as a light sensor. It oscillates between 5 Hz in the dark and 31 Hz under daylight, from a 5-V supply voltage. The measured light-sensitivity of the oscillation frequency is between 7.4 Hz/klx in the dark and around 1.7 Hz/klx in daylight. On average, the frequency of oscillation changes by 58 %/klx. The required power is 188 µW. The presented design is a combination of the inductance-capacitance cross-coupled oscillator structure and two single-transistor active inductors, which enable high gain at low power levels in a small chip area. We analyze the circuit and derive design guidelines for minimizing the oscillation frequency, circuit area, and power consumption. Finally, we report the measurements including jitter and deduce implications for the accuracy of light measurements.

History

Publication status

  • Published

Journal

IEEE Journal of Solid-State Circuits

ISSN

0018-9200

Publisher

Institute of Electrical and Electronics Engineers

Department affiliated with

  • Engineering and Design Publications

Research groups affiliated with

  • Sensor Technology Research Centre Publications

Full text available

  • No

Peer reviewed?

  • Yes

Legacy Posted Date

2019-06-24

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