A discrete implementation of a bidirectional circuit for actuation and read-out of resonating sensors

In this paper we propose a simple and compact way to realize a bi-directional interface to drive resonant sensors. The bi-directional interface can be set to both activate the resonating sensor (activation mode) and to read its response (read-out mode). During the normal operation of the system these two modes are activated alternatively, depend on the state of the control signals. The directionality of this device is decided by swapping the power supply rails. The system has been tested using a RLC load, considered as the model for a resonant sensor. Experimental results of a discrete board prototype show the applicability of the interface for resonant load.