Design, Simulation, and Measurement of Interface Electronics for Wearable SAW Drug Delivery System
Open AccessSurface Acoustic Wave (SAW) shows a great ability to control and manipulate microfluidics, nanoparticles, and biomolecules, and drug delivery to the patient body. With the use of advanced fabrication techniques, small size SAW devices, and Interdigital Transducers (IDTs) could be obtained, which offer the possibility to a wearable device. The shrinking of the device size implies the requirements of the electronics to be small, flexible, and power-efficient, and with the ability to communicate wireless to the cloud. In this thesis, the design, simulation, building, and test of the interface electronics are discussed. We start the simulation with Integrated Circuit simulation (SPICE) model to verify the feasibility of the method. We build prototypes of the circuits on the breadboards to test the circuits. We designed an oscillator with the aim to use it in the receiver by building and testing different crystal-capacitor oscillator circuits and inductor-capacitor (LC) oscillator circuits with different resonance frequencies. We designed PCB and integrate the AC-DC converter and oscillator to form the whole system receiver. We verified the possibility of building a stretchable circuit with Polydimethylsiloxane (PDMS) substrate and a gold layer deposited on the PDMS.
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