Post by patrikc on Nov 16, 2007 3:55:26 GMT -5
Hi,
first of all, thanks Charan for these very interesting tutorials.
We have a debate in my company on how to calculate the receiver sensitivity with temperature.
Sensi = kTB + NF + C/N
C/N is demodulator requirement, and does not vary with temperature for a digital implementation
NF is the noise figure, and is referenced to 290K according IEEE standard (Friis proposed this temperature in 1944). NF varies with temperature of course.
My point is that, when you compute the sensitivity at different temperature, the "T" of kTB should remain equal to 290K, otherwise you account twice for the thermal noise change, once in the NF, and once in kTB.
What is your opinion on that?
Cheers, Patrikc
first of all, thanks Charan for these very interesting tutorials.
We have a debate in my company on how to calculate the receiver sensitivity with temperature.
Sensi = kTB + NF + C/N
C/N is demodulator requirement, and does not vary with temperature for a digital implementation
NF is the noise figure, and is referenced to 290K according IEEE standard (Friis proposed this temperature in 1944). NF varies with temperature of course.
My point is that, when you compute the sensitivity at different temperature, the "T" of kTB should remain equal to 290K, otherwise you account twice for the thermal noise change, once in the NF, and once in kTB.
What is your opinion on that?
Cheers, Patrikc