A High-Resolution Ultrasonically Powered and Controlled Optogenetic Stimulator with A Novel Fully Analog Time to Current Converter

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In this paper, a power-efficient and high-resolution ultrasonically powered and controlled optogenetic stimulator system is proposed. The proposed system benefits from a novel fully analog Time to Current Converter (TCC) for driving a μLED for optogenetics according to time-encoded data over ultrasonic waves. The whole system including a high-efficiency active rectifier, a double-pass regulator, a burst detector, an overvoltage regulator, a reference generator and the novel TCC are designed, analyzed and simulated in transistor level in standard TSMC 0.18 μm CMOS technology in conjunction with a lumped-element model for the piezoelectric receiver. For an LED current of 1 mA, a chip efficiency of 94 % is achieved according to the simulation results. The rectified voltage at the output of the active rectifier is equal to 2.85 V for a 1 mA load and is limited to 3.02 V by the overvoltage regulator, for loads of less than 905 μA. The proposed TCC demands only 0.2 V overhead voltage and specifically designed to converts the time duration between 5-55 μs to a current of 0-1000 μA linearly and according to the application requirements.

OriginalsprogEngelsk
Titel42nd Annual International Conferences of the IEEE Engineering in Medicine and Biology Society (EMBC)
Antal sider4
UdgivelsesstedMontreal, QC
ForlagIEEE
Udgivelsesårjul. 2020
Sider3411-3414
ISBN (Elektronisk)9781728119908
DOI
StatusUdgivet - jul. 2020
Begivenhed42nd Annual International Conferences of the IEEE Engineering in Medicine and Biology Society, EMBC 2020 - Montreal, Canada
Varighed: 20 jul. 202024 jul. 2020

Konference

Konference42nd Annual International Conferences of the IEEE Engineering in Medicine and Biology Society, EMBC 2020
LandCanada
ByMontreal
Periode20/07/202024/07/2020
SerietitelProceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS
Vol/bind2020-July
ISSN1557-170X

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