一 前言 PN结测温是依据在恒定正向电流下,PN结电压与温度呈近似线性关系而实现的。严格地讲,PN结的V—T关系是非线性的。这种非线性引起PN结恒流测温的误差。在0～500℃温区内,一个质量良好的碳化硅PN结,其非线性偏差可以达到1.5％以上。对工业用温度计来说,这也是过大的误差。碳化硅PN结非线性偏差统计分布规律如图1,由图可见,对于大部份PN结而言,无须采取线性化措施,即可 A preamble PN junction temperature measurement is based on the constant forward current, PN junction voltage and temperature was approximately linear relationship achieved. Strictly speaking, PN junction V-T relationship is non-linear. This non-linear PN junction constant current temperature measurement error. In the temperature range of 0 ~ 500 ℃, a good quality silicon carbide PN junction, the non-linear deviation can reach more than 1.5%. For industrial thermometers, this is too much of an error. Silicon nitride PN junction nonlinear deviation statistical distribution shown in Figure 1, can be seen from the figure, for most PN junction, without taking linear measures, you can