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.
Original languageEnglish
Publication year2020
Publication statusAccepted/In press - 2020
Event2020 42nd Annual International Conferences of the IEEE Engineering in Medicine and Biology Society -
Duration: 20 Jul 202024 Jul 2020
https://embc.embs.org/2020/

Conference

Conference2020 42nd Annual International Conferences of the IEEE Engineering in Medicine and Biology Society
Period20/07/202024/07/2020
Internet address

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