Implantable neural stimulation devices have drawn attention for various clinical purposes. Capacitor-coupled stimulation inherently maintains charge-balance, allowing the use of less complex pulsegenerating circuits. This Letter proposes a self-powered relaxation oscillator, which allows direct charge transfer from the energy harvester to the capacitive stimulation electrode. As the proposed circuit does not require power supply to operate the oscillator itself, it achieves high power efficiency by eliminating wasted current from the power supply to the ground. A prototype of the proposed oscillator was fabricated with a 0.35 μm standard CMOS process. The prototype chip demonstrates power efficiency of up to 94.1% at 520 Hz for 1.4 V signal swing.
Bibliographical noteFunding Information:
Acknowledgments: This work has been supported by the Future Combat System Network Technology Research Center program of Defense Acquisition Program Administration and Agency for Defense Development (UD160070BD) © The Institution of Engineering and Technology 2018 Submitted: 19 November 2017 E-first: 19 January 2018 doi: 10.1049/el.2017.4322 One or more of the Figures in this Letter are available in colour online. G. Hong and G. Han (School of Integrated Technology, Yonsei University, Incheon, Korea) ✉ E-mail: email@example.com
All Science Journal Classification (ASJC) codes
- Electrical and Electronic Engineering