Analysis of a negative impedance converter as a temperature compensator for bridge sensors

In this paper, we present an in-depth analysis of a negative impedance converter (NIC) as a temperature compensation device for bridge sensors. Even though its use has been proposed in some application notes and a patent, no theoretical justification has been reported so far, at least to the best of our knowledge. This paper attempts to fill this gap, giving closed-form expressions for a correct use of the NIC in any application. The influence of second-order effects in the temperature compensation is also considered. Experimental results are provided in order to verify the principles presented.