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HO12_214W09_Noise_part2_2pp

HO12_214W09_Noise_part2_2pp - Handout#12 EE 214 Winter 2009...

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Handout #12 EE 214 Winter 2009 Electronic Noise Part II B. Murmann and B. A. Wooley Stanford University Noise in Circuits (1) Most circuits have more than one relevant noise source In order to quantify the net effect of all noise sources, we must refer the noise sources to a single "interesting" port of the circuit Usually the output or input B. A. Wooley, B. Murmann EE214 Winter 2008-09 2
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Noise in Circuits (2) Output referred noise Input referred noise Refer noise to output via individual noise transfer functions – Physical concept, exactly Represent total noise via a fictitious input source that captures all circuit-internal noise sources Physical concept, exactly what one would measure in the lab Useful primarily for “general purpose” components, in which the output noise depends on how the component is used B. A. Wooley, B. Murmann EE214 Winter 2008-09 3 Circuit Example For simplicity, let’s neglect Source impedance All it All capacitances Burst and flicker noise – r o , r b , and r μ B. A. Wooley, B. Murmann EE214 Winter 2008-09 4
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