The objective of this research work is to introduce amathematical analysis and linearizationtechniquesoftransducers. There are many types of transducers. one ofthese typestransducersmeasuring systems using thermistors).In our thesis we will introduce three different methodsfor temperature transducers using thermistors :Temperature - to - frequency converter using thermistorin the feedback ratio determing network of an integratedcircuitonastableoperationalamplifierbasedmultivibrator circuit.Temperature - to - frequency converter usingin an integrable oscillator circuit.Temperature - to - voltage converter using thermistor inthermistorlogarithmic network.In each one of the preced~ng three methods themathematical analysis will be based on an investigation foreach parameter in each circuit to study its effect on thelinearization process. Also, we try to extend the workingrange of temperature keeping the linearity of the outputover that range or at least with small deviation can beneglected.