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Thermistor Linearization on FPGA Using Hoge Equations

This paper investigates fixed point implementations of five thermistor linearization techniques, namely, Hoge 1, Hoge 2, Hoge 3, Hoge 4 and Hoge 5 on field programmable gate array (FPGA) in LabVIEW environment. The relative performance assessment, on the basis of residual nonlinearity and hardware utilization, has been carried out and presented so as to enable the user to choose a particular linearization technique for his/her application depending on the available FPGA hardware resources. The presented experimental investigations validated the residual nonlinearities in ascending order for Hoge 2, Hoge 3, Hoge 4, Hoge 1 and Hoge 5 techniques as 4.53812E-08, 1.80728E-06, 6.14227E-05, 5.86377E-04 and 2.87804E-02, respectively for an industrial grade thermistor (Model No.: TJ36-44004-1/4-12, M/S Omega Engineering). Further, hardware utilizations have been recorded using the number of flip-flops, 4 input LUTs, slices occupied and multiplexers for Hoge 3, Hoge 2, Hoge 4, Hoge 1 and Hoge 5 in descending order. The reported results, in this work, are expected to be of industrial importance as thermistor is a common sensor which finds lots of applications.