I have a question about the mentioned resistor noise in CN-0396 on page 4.
"The 12.4 kΩ resistors, R7 and R11, each contribute approximately 294 nV p-p over the 0.1 Hz to 10 Hz bandwidth."
This 294nVpp is used in the total noise calculation. How is this value calculated? I suppose that this value is from the Johnson noise, but I don't get 294nVpp...
Thanks for your help
Hi Flo91, looks like the calculation assumes a crest factor of 6.6:
total peak-to-peak noise = sqrt(4*1.38e-23*300K*12500 ohms) * sqrt(9.9Hz) * 6.6 = 297nV
you can refer on this links that shows where that 6.6 factor was derived:
Edit: here is the link: www.analog.com/.../CN0396.pdf
Thank you very much for your answer. Is there a reason for 6.6 or is it just a thumb rule?