Analysis of the Wheatstone Bridge Radiometer Performance Dependence on the Ambient Temperature

In this paper it is analysed the performance dependence on the ambient temperature of the constant temperature Wheatstone Bridge architecture for a radiometer. The parameters considered in this analysis are the sensitivity, response time, and circuit power consumption. The analysis was carried out through simulations in SPICE using a developed model of a positive temperature coefficient thermoresistive sensor. The results show that the ambient temperature plays a major influence of the architecture performance evidencing as main limitation of this architecture.