Browsing by Author "Lin, Shiau-Pin"

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An 82.9%-Efficiency Triple-Output Battery Management Unit for Implantable Neuron Stimulator in 180-nm Standard CMOS
(2019-05-01)
Liu, Chi-Wei
;
Chen, Yi-Lun
;
Liao, Pei-Chun
;
Lin, Shiau-Pin
;
Wang, Ting-Wei
This brief presents a high-efficiency battery management unit combining a single-inductor dual-output (SIDO) buck converter with two charge pumps (CPs) to provide three voltage levels (6 V, -6 V, and 2 V) for neuron stimulators in implantable medical devices. The stacked power stage in the buck converter mitigates the voltage stress issue in the power stage to manage 3.2-4.8 V battery voltage. By cascading a buck converter and CPs, the voltage across the CP power stage is reduced to generate 6 V and -6 V high voltage outputs without using high voltage devices. As a result, the proposed battery management could provide 6 V, -6 V, and 2 V output voltages from 3.2 to 4.8 V input voltage using a 180-nm standard CMOS process. The measurement results demonstrate that the proposed battery management achieved a peak efficiency of 82.9% with an available input voltage of 3.2-4.8 V.
Design of Multiple-Charge-Pump System for Implantable Biomedical Applications
(2018-01-01)
Lin, Shiau-Pin
;
Ker, Ming-Dou
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電子工程學系及電子研究所
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Department of Electronics Engineering and Institute of Electronics
Circuit design to implement a multiple-charge-pump (MCP) system in a low-voltage standard CMOS process is proposed, that can successfully support the desired power sources for implantable monopolar biphasic stimulator. A negative charge pump (CP) circuit with the four-phase cross-couple structure is introduced to suppress return-back leakage, and thus its power efficiency is improved. This MCP system provides the stimulator with three power sources of +9V, -9V, and -2.7V, simultaneously. Closed-loop operation helps for regulating the output voltage sources (+9V and -9V) with a maximum loading current of 5.5mA for stimulus drivers, and 1-mA current for the control circuits of the stimulator. The proposed MCP system has been fabricated in a 0.18-mu m 1.8V/3.3-V CMOS process, as well as successfully verified in in-vivo animal tests with stimulator together.