Resistor Based Temperature Sensor Using Active Inductor Oscillator

Abstract

In this communication we present a temperature sensor based on the conversion of an on chip resistor variation with temperature into the period of a harmonic oscillator built with an active inductor resonator. The nonlinearity behavior of active inductor resonator is suppressed using an automatic amplitude control (AAC) loop which in turn makes the period of oscillation linear. An inaccuracy of ±0.34°C/±0.1°C after a first/second order polynomial fitting at a conversion speed of 30µs. The resolution for this time of conversion is 0.25°C. This innovative principle can be applied to any harmonic oscillator based on gyrator active inductor resonator.