A 570-kbps ASK demodulator without external capacitors for low-frequency wireless bio-implants

Chua Chin Wang, Tzung Je Lee, U. Fat Chio, Yu Tzu Hsiao, Jia Jin J. Chen

研究成果: Article同行評審

13 引文 斯高帕斯(Scopus)


This paper proposes a novel structure of ASK (amplitude shift keying) demodulators, which requires no external capacitors, for implantable micro-stimulators. By using a traditional β multiplier reference to detect the signal envelope, followed by a Schmitt trigger and a load driver, the large off-chip capacitor in traditional ASK demodulators is not required any more. Therefore, the proposed circuit possesses small area to be integrated in an SOC (system-on-chip). Besides, due to the lack of the large capacitor, the proposed circuit can operate with a higher data rate using lower frequency carriers. The proposed circuit is integrated in an implantable micro-stimulator on silicon using 0.35 μ m 2P4M CMOS process. The area of the proposed circuit occupies merely 0.039 mm2 with a maximum power dissipation of less than 12 mW (including the power consumption of the analog circuits of the micro-stimulator) by measurement results on silicon. Moreover, the measurement results verify that the proposed ASK demodulator can detect the ASK modulated signal up to 570 kbps data rate at 2 MHz carrier frequency when the modulation index is 10%.

頁(從 - 到)130-136
期刊Microelectronics Journal
出版狀態Published - 2008 1月

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 原子與分子物理與光學
  • 凝聚態物理學
  • 表面、塗料和薄膜
  • 電氣與電子工程


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