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unplebeian
#2
Jan14-08, 08:32 AM
P: 137
Noise is as you said, unwanted disturbance in the signal. Noise is random and mathematically it is represented by a Gaussian distribution. There are various causes of noise, some of which you mentioned. The noise from each particular source is added up and the result is in the unit of mV. This can be +ve or -ve mV and is added to the calculation done without noise (used superposition here)

Gray and Meyer is a standard textbook, but it's hard to read. If you are well versed with electronics and math then I suggest you buy the book. Another book is Mohammed Gausi (spelling?) or try Sedra and Smith (don't know if they have a chapter on noise)

Or you can just google it: http://en.wikipedia.org/wiki/Electronic_noise