Ultrasonically Powered and Controlled Microsystem for Dual-Wavelength Optogenetics With a Multiload Regulation Scheme

Amin Rashidi, Milad Zamani*, Tanmay Mondal, Seyedsina Hosseini, Kjeld Laursen, Brian Corbet, Farshad Moradi

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

This letter presents an ultrasonically powered dual-wavelength optogenetic device that targets simultaneous excitation and inhibition of neural activities, or in a broader sense, optical stimulation in two distinct wavelengths for targeting different populations of neurons. This can be applied to a variety of neurological disorders. The device features a load regulator circuit that shares the available power budget between two LEDs in a power-efficient and controlled way suppressing the need for adaptive matching and overvoltage protection circuits. Furthermore, the regulator circuit is capable of detecting power burst availability on the device and generating a control signal, accordingly. For 5.25 -mW acoustic power at the device's surface, the rectified voltage, and the total current load of the system are regulated to 2.79 V and 600A , respectively. The maximum chip and device efficiencies of 92.5% and 31.8% are measured, respectively. The total die area in 180 nm CMOS technology nose and the estimated system volume are 0.16 mm2 and 0.572 mm3, respectively.
Original languageEnglish
JournalIEEE Solid-State Circuits Letters
Volume6
Pages (from-to)33-36
ISSN2573-9603
DOIs
Publication statusPublished - 2023

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