Handout #12EE 214Winter 2009Electronic NoisePart IIB. Murmann and B. A. WooleyStanford UniversityNoise in Circuits (1)Most circuits have more than one relevant noise sourceIn 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 inputB. A. Wooley, B. Murmann EE214 Winter 2008-092
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Noise in Circuits (2)Output referred noiseInput 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 sourcesPhysical 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 usedB. A. Wooley, B. Murmann EE214 Winter 2008-093Circuit ExampleFor simplicity, let’s neglect–Source impedanceAllit–All capacitances–Burst and flicker noise– ro, rb, and rμB. A. Wooley, B. Murmann EE214 Winter 2008-094