Passive wireless sensors are crucial in modern medical and industrial settings to monitor procedures and conditions. We demonstrate a circuit to inductively excite passive resonators and to conduct their decaying signal response to a low noise amplifier. Two design variations of a generic transmit-receive signal chain are proposed, measured, and described in detail for the purpose of facilitating replication. Instrumentation and design aim to be scalable for multi-channel array configurations, using either off-the-shelf class-D audio amplifiers or a custom full H-bridge. Measurements are conducted on miniature magneto-mechanical resonators in the ultra low frequency range to enable sensing and tracking applications of such devices in different environments.
@article{arxiv.2502.03202,
title = {Low-cost analog signal chain for transmit-receive circuits of passive induction-based resonators},
author = {Fabian Mohn and Florian Thieben and Tobias Knopp},
journal= {arXiv preprint arXiv:2502.03202},
year = {2025}
}
Comments
Data available at https://doi.org/10.5281/zenodo.14764827