I am reading this paper in which a circuit is explained to amplify with the voltage sensed by the change in resistance of an NTC.

There are some points that I do not understand that I would like to ask you:

..in particular, when developing the calculations (which I tried to do), I don't know where the

How did you find Rntc(max) and Rntc(min) ?

In theory, Rntc=R0*e^b(1/T-1/T0) ... but if I don't know what NTC was used, I don't know how much R0 and beta "b" are ... so I can't derive "Rntc". In my opinion, the choice is arbitrary and, therefore, this calculation should be done according to the NTC you have. Am I wrong?

There are some points that I do not understand that I would like to ask you:

**1)**It is not clear to me how the Vout was found ... can you explain the reported formula?..in particular, when developing the calculations (which I tried to do), I don't know where the

*-(R4/R3)*Vdd*appears from.**2)**When it says "*calculate the value of R1 to produce a linear output voltage. Use the minimum and maximum values of the NTC to obtain a range of values for R1*" ..How did you find Rntc(max) and Rntc(min) ?

In theory, Rntc=R0*e^b(1/T-1/T0) ... but if I don't know what NTC was used, I don't know how much R0 and beta "b" are ... so I can't derive "Rntc". In my opinion, the choice is arbitrary and, therefore, this calculation should be done according to the NTC you have. Am I wrong?

**3)**What is Vin for? To correct any offset?
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