Pseudologarithmic thermistor signal conditioning spans wide temperature range

摘要

Given its low cost, small size, robust construction, accuracy, versatility and sensitivity, it's no wonder that the thermistor rates as one of the most popular temperature sensors available. However, in some applications, a thermistor can exhibit too much sensitivity for wide-range temperature measurements. For example, when you combine a thermistor's radically nonlinear exponential resistance-versus-tempera-ture-response curve with a linear signal conditioner (Reference 1), the resultant graph resembles a difficult-to-character-ize response, as Trace A shows (Figure 1).