Abstract
This paper presents an ultrasonically powered micro-system for deep tissue optogenetic stimulation. The developed system is composed of a Base for Powering and Controlling (BPC) and an implantable Dust for optogenetics and drug delivery. The Dust consists of a piezoelectric crystal, a rectifier chip, and a micro-scale custom-designed light-emitting-diode (μLED) integrated, miniaturized, and envisioned to be used for freely moving animal studies. The proposed Dust operates in frequencies up to 5 MHz, power levels in the 0–10 mW range, achieves start-up within 1.8 μs at 2.9 MHz operating frequency at 14.4 mW/mm2 ultrasound power density, and 98.1% chip efficiency at 2 mW input power. With the BPC implemented and attached to (500 μm)3 PZT4 crystals, set to 60 V at 2.8 MHz operating frequency at 3 mm distance in demineralized water, the dust delivered up to 6 mW to its load (μLED for optogenetics), which translates to 0.11% total system efficiency.
Original language | English |
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Journal | IEEE Transactions on Circuits and Systems II: Express Briefs |
Volume | 70 |
Issue | 10 |
Pages (from-to) | 3937-3941 |
Number of pages | 5 |
ISSN | 1549-7747 |
DOIs | |
Publication status | Published - 1 Oct 2023 |
Keywords
- Bridge circuits
- Crystals
- Dust
- Light emitting diodes
- Logic gates
- Optogenetic stimulation
- Optogenetics
- piezoelectric
- rectifier
- Rectifiers
- Substrates
- Ultrasonic power transfer
- optogenetic stimulation
- ultrasonic power transfer