Tuned Amplifier With Embedded Dual-Parameter LC Sensor

LC sensors represent a very practical and efficient solution for low-power, low-cost, and highly scalable wireless sensors, in a wide range of medical, industrial, automotive, and agricultural applications. Conventional LC sensing circuits consist of a capacitive sensor and an inductive link. A change in capacitance is translated to a shift in resonance frequency, that can be recorded by a reader coil. These sensors are limited to measuring one parameter (change in capacitance). There is scope to extend the capabilities of LC sensors to monitor two parameters simultaneously. We have recently proposed an inductive sensor for pressure/displacement monitoring that can be combined with a capacitive sensor. In this letter, we present the working principle of a tuned amplifier with a dual-parameter LC sensor. This letter represents a proof-of-concept for the development of future more compact and scalable LC sensors.