Hi everyone,
So, as I am reading this part of amazing book, the Celsius zero shift for two -terminal temperature sensor circuit of Fig 21.19 is not fully understood by me.
what I understood:
-The \[ V_{\text{Temp}} \] at the two terminal of the Zenner diode is directly coming from the circuit Fig.21.18 which is the output is of value (10mV/K)*T
-the current frlowing through the V-(not in) is the sum of Vo/10Kohm+Vref/9.16Kohm.
-the only time I get the Vo=-2.73V is when the \[ V_{\text{Temp}}=0 \] and a that value the current flowing through the V-(not in) is negligible.
What I did not understand:
1-where did the formula come from, it is like converting Kelvin to Celsius? \[ V_{\text{o}}=\left(\frac{10\text{mV}}{\text{Celsius}}\right) v\]
2-what does the \[ v\] stand for?
3-at C=0, it means Tk=273Kelvin and then V_temp=10*273=2.73V which bring the Vo~=0V?
here , is the page of the book and falstad simulator:
![1711553927254.png 1711553927254.png](https://forum.allaboutcircuits.com/data/attachments/306/306175-b331fbbb049602959654940c911bd96e.jpg)
![1711554073583.png 1711554073583.png](https://forum.allaboutcircuits.com/data/attachments/306/306177-3cde3a1da4c7961377db2dd6fd32fcb6.jpg)
So, as I am reading this part of amazing book, the Celsius zero shift for two -terminal temperature sensor circuit of Fig 21.19 is not fully understood by me.
what I understood:
-The \[ V_{\text{Temp}} \] at the two terminal of the Zenner diode is directly coming from the circuit Fig.21.18 which is the output is of value (10mV/K)*T
-the current frlowing through the V-(not in) is the sum of Vo/10Kohm+Vref/9.16Kohm.
-the only time I get the Vo=-2.73V is when the \[ V_{\text{Temp}}=0 \] and a that value the current flowing through the V-(not in) is negligible.
What I did not understand:
1-where did the formula come from, it is like converting Kelvin to Celsius? \[ V_{\text{o}}=\left(\frac{10\text{mV}}{\text{Celsius}}\right) v\]
2-what does the \[ v\] stand for?
3-at C=0, it means Tk=273Kelvin and then V_temp=10*273=2.73V which bring the Vo~=0V?
here , is the page of the book and falstad simulator:
![1711553927254.png 1711553927254.png](https://forum.allaboutcircuits.com/data/attachments/306/306175-b331fbbb049602959654940c911bd96e.jpg)
![1711554073583.png 1711554073583.png](https://forum.allaboutcircuits.com/data/attachments/306/306177-3cde3a1da4c7961377db2dd6fd32fcb6.jpg)
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