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A Programmable Implantable Microstimulator SoC With Wireless Telemetry: Application in Closed-Loop Endocardial Stimulation for Cardiac Pacemaker

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9 Author(s)
Shuenn-Yuh Lee ; Electr. Eng. Dept., Nat. Chung Cheng Univ., Ming-Hsiung, Taiwan ; Su, M.Y. ; Ming-Chun Liang ; You-Yin Chen
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A low-power, wireless, and implantable microstimulator system on chip with smart powering management, immediate neural signal acquisition, and wireless rechargeable system is proposed. A system controller with parity checking handles the adjustable stimulus parameters for the stimulated objective. In the current paper, the rat's intra-cardiac electrogram is employed as the stimulated model in the animal study, and it is sensed by a low-voltage and low-power monitoring analog front end. The power management unit, which includes a rectifier, battery charging and detection, and a regulator, is used for the power control of the internal circuits. The stimulation data and required clock are extracted by a phase-locked-loop-based phase shift keying demodulator from an inductive AC signal. The full chip, which consumes 48 μW only, is fabricated in a TSMC 0.35 μm 2P4M standard CMOS process to perform the monitoring and pacing functions with inductively powered communication in the in vivo study.

Published in:

Biomedical Circuits and Systems, IEEE Transactions on  (Volume:5 ,  Issue: 6 )

Date of Publication:

Dec. 2011

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