Sigma-Delta Modulator with Thermoresistive Sensor Frequency Response

In our previous paper we proposed feedback architecture with thermo-resistive sensor, based on thermal sigma-delta principle to realize digital measurement of physical quantities that interacts with the sensor: temperature, thermal radiation, fluid velocity. This architecture uses 1-bit sigma-delta modulator in which considerable part of conversion functions is performed by a thermoresistive sensor. The sensor is modelled using electrical equivalence principle and the applied measure method is constant temperature. Now we present frequency response analysis and signal to noise ratio dependence on oversampling ratio for this architecture applied to thermal radiation measurement