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Calculates the root mean square value of the Noise Voltages VN(rms) that appear at the OUTPUT of a single stage Common Emitter (CE) amplifier based on the a.c. model opposite
The focus is on the amplfier Noise Figure ~ Resuts in nV/√Hz are the respective resistor Johnson noise voltages
It does not take into account flicker noise and assumes: Perfect resistive loads and modern silicon transistor with low noise bias and the transistor gain (β) is constant within the measurment bandwidth (Bn) defined
The circled nodes B C and E represent the external connections of the transistor so rbb and re are internal ~ output resistance ro is not used here
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See these references:
The Art of Electronics 3rd edition chapter 8 ~ By Paul Horowitz and Winfield Hill Noise in Transistor Circuits ~ By P. J. Baxandall ~ Wireless World November 1968 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"