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 Corbett, Farshad Moradi

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperLetterpeer-review

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 μ 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 600 μA , 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
Number of pages4
DOIs
Publication statusPublished - Jan 2023

Keywords

  • Aperture efficiency
  • dual-wavelength optogenetics
  • dust
  • load regulator
  • piezoelectric
  • ultrasonic power transfer

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