Oscillation-controlled CMOS ring oscillator for wireless sensor systems

  • Authors:

  • Wang-Hoon Lee;Bon-Ju Gu;Yoshio Nishida;Hidekuni Takao;Kazuaki Sawada;Makoto Ishida

  • Affiliations:

  • Department of Electric and Electronic Engineering, Toyohashi University of Technology, 1-1 Hibarigaoka, Tempaku-cho, Toyohashi, Aichi 441-8580, Japan and JST-CREST, Japan Science and Technology Ag ...;Department of Electric and Electronic Engineering, Toyohashi University of Technology, 1-1 Hibarigaoka, Tempaku-cho, Toyohashi, Aichi 441-8580, Japan;Intelligent Sensing System Research Center (ISSRC), Toyohashi University of Technology, Japan and JST-CREST, Japan Science and Technology Agency, Japan;JST-CREST, Japan Science and Technology Agency, Japan and Department of Intelligent Mechanical Systems Engineering, Kagawa University, 2217-20 Hayashi-cho, Takamatsu, Kagawa 761-0396, Japan;Department of Electric and Electronic Engineering, Toyohashi University of Technology, 1-1 Hibarigaoka, Tempaku-cho, Toyohashi, Aichi 441-8580, Japan and Intelligent Sensing System Research Center ...;Department of Electric and Electronic Engineering, Toyohashi University of Technology, 1-1 Hibarigaoka, Tempaku-cho, Toyohashi, Aichi 441-8580, Japan and Intelligent Sensing System Research Center ...

  • Venue:
  • Microelectronics Journal
  • Year:
  • 2010

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Abstract

This paper presents a ring oscillator with the function of the oscillation controlled for wireless sensor systems (WSSs). The proposed oscillator consists of a NAND gate, 4 inverters, and 1-, 3-, 9-times buffer stage. Operation of it is controlled by the NAND gate. The oscillator can reduce the power loss because the oscillator is oscillated during only high level input. The proposed oscillator was designed and fabricated by 2.5@mm CMOS technology, through which it is possible to realize a WSS on a single chip because a sensor and an oscillator can be fabricated concurrently. The frequency tuning range of the oscillator was found to be approximately 90-152MHz and the output power of the oscillator was -8.42dBm. The measured phase noise is -99.35 and -102.59dBc/Hz at 1 and 5MHz offsets, respectively, from the carrier of 152MHz. Power consumption of the oscillator is determined by the duty cycle of the input signal pulse, and the range of power consumption was measured as 1.5-45mW at the duty cycle of 1.0.