Two resistors and a voltage source – that is all we need to create a very simple thermometer model. Figure below shows the idea. R1 is an ideal resistor model. R2 resistance value changes with temperature allowing us to indirectly measure it.
R2 2 0 15K TC=0.001 0.000005 R1 1 2 15k Vin 0 1 10 .DC TEMP -50 100 2 .PROBE .END
In probe: (V(1)- V(2))/ I(R1) and V(2)/ I(R2)
After running the simulation we get some interesting results, R1 resistance is fixed while R2 resistance increases as the temperature rises:
