An Ultrasonically Powered Optogenetic Microstimulators with Power-Efficient Active Rectifier and Charge Reuse Capability

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This paper proposes a novel system for ultrasonically-power optogenetic microstimulator. In this system, a novel powering approach for the comparators is proposed that improves the power conversion efficiency of the rectifier. This is done by lowering the Rail-to-Rail supply voltage of the comparators and consequently their propagation delay. This technique enhances the power conversion efficiency of the active rectifiers in two ways: a. decreasing the
propagation delay of the comparators; and b. enabling reuse of consumed power by the comparators and drivers of power transistors. The proposed system including the active rectifier, a novel double-pass regulator, a current reference, and a burst detection circuit is simulated in TSMC 0.18-µm CMOS technology and occupies an area of 0.09 mm2. The proposed active rectifier connected to a load of 3 kΩ, generates an output voltage of up to 3 V out of an input AC signal with the amplitude of 3.2V and the frequency range of 1-14 MHz. In the same frequency range and with the same load, it exhibits a voltage conversion ratio of 92.25-93.75% and power conversion efficiency of up to 95%. The double-pass regulator is proposed for seeking both power efficiency and over-voltage protection in this specific design.
OriginalsprogEngelsk
Titel2019 IEEE International Symposium on Circuits and Systems (ISCAS), Proceedings
Antal sider5
ForlagIEEE
Udgivelsesår2019
ISBN (trykt)978-1-7281-0397-6
StatusUdgivet - 2019
Begivenhed51st IEEE International Symposium on Circuits and Systems - Sapporo, Japan
Varighed: 26 maj 201929 maj 2019
Konferencens nummer: 51
https://www.iscas2019.org/

Konference

Konference51st IEEE International Symposium on Circuits and Systems
Nummer51
LandJapan
BySapporo
Periode26/05/201929/05/2019
Internetadresse

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