A charge-pump based multi-mode stimuli generator for cardiac pacemaking

Esmailiyan, Ali; Shaker, Amir Hossein; Ghotbi, Iman; Shoaei, O.

doi:10.1109/newcas.2016.7604752

Cited by 2 publications

(1 citation statement)

References 9 publications

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“…In those implantable devices with therapeutic functions, such as cardiac pacemakers [4,5] , cochlear implants [6] , and brain-machine interfaces [7] , highvoltage electrical pulses with magnitude of several to over 10 V are generated to stimulate the neuron or muscle for a particular purpose of treatment. Since most implantable medical devices are powered by a battery with about 2-V supply voltage, charge pumps are often employed to provide highvoltage power supply or control signals for the pulse generators [8][9][10][11] . In order to provide a life span up to several years for the implantable medical devices, the power efficiency of the charge pump must be as high as possible.…”

Section: Introductionmentioning

confidence: 99%

A high-efficiency charge pump in BCD process for implantable medical devices

Zhang

2018

J. Semicond.

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This paper presents a high-efficiency charge pump circuit composed of cascaded cross-coupled voltage doublers implemented in an isolated bipolar-CMOS-DMOS (BCD) technology for implantable medical devices. Taking advantage of the transistor structures in the isolated BCD process, the leakage currents caused by the parasitic PNP transistors in the cross-coupled PMOS serial switches are eliminated by simply connecting the inside substrate terminal to the isolation terminal of each PMOS transistor. The simple circuit structure leads to small parasitic capacitance in the voltage doubler, which in turn ensures high efficiency of the overall charge pump. The proposed charge pump with 5 cascaded voltage doublers is fabricated in a 0.35-μm isolated BCD process. Measurement results with 2-V power supply, 1-MHz driving clock frequency and 40-μA current load show that an efficiency of 72.6% is achieved, and the output voltage can be pumped to about 11.5 V at zero load current. The chip area of the charge pump is 1.6 × 0.35 mm2.

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