Using quartz resonators for maximizing wake-up range in wireless wake-up receivers

Abstract

Separate wake-up receiver circuits for wireless sensor nodes combine the advantage of permanent accessibility with a very low current consumption, enabling nodes to work for several years. In a sleeping node incoming signals are passively demodulated and low-pass filtered. Till now we used an R-C circuit for filtering. In this work a quartz resonator is used between its parallel and serial resonance as an inductance with high Q-factor. This way higher voltages after demodulation compared to the R-C circuit could be reached. Since a higher voltage results in an increased wake-up signal detection, the wake-up range of the node can be extended.