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Calculates the root mean square value of the Noise Voltage VN(rms) at the output of an Emitter follower ~ Are emitter followers noisy when used as pre-amplifiers ? ~ If the output impedance presented to the next stage is lower than RS but the SNR is not affected very much is this an adavantage ?
Calculation does not take into account flicker noise and assumes: Perfect resistive loads and a modern silicon transistor with low noise bias and the transistor gain is constant within the measurment bandwidth defined
The circled nodes B C and E represent the external connections of the transistor so rbb and re are internal ~ The output resistance ro is included but if not known assume its value is >2MΩ
See these references:
The Art of Electronics 3rd edition chapter 8 ~ By Paul Horowitz and Winfield Hill ~ fellow cynics
Noise in Transistor Circuits ~ By P. J. Baxandall ~ Wireless World November 1968 ~ often referenced
Designing lownoise audio amplifiers ~ By Wilfried Adam ~ Wireless World June 1989
Introduction to lownoise amplifier design ~ By A. Foord ~ Wireless World April 1981
The design of Low-noise audio frequency amplifiers ~ By E. A. Faulkner ~ The Radio and Electronic Engineer July 1968 ~ This article along with the book 'Low-Noise Electronic System Design' By C. D. Motchenbacher and J. A. Connelly should answer most questions about electronic noise
"Do you work it out one by one ~ Or played in combination"