Handout #11EE 214Winter 2009Electronic NoisePart IB. Murmann and B. A. WooleyStanford UniversityTypes of Noise"Man made noise” or interference noise–Signal coupling–Substrate coupling–Finite power supply rejection– Solutions•Fully differential circuits•Layout techniques"Electronic noise" or "device noise" (focus of this handout)Electronic noise or device noise (focus of this handout)– Fundamental•E.g. "thermal noise" caused by random motion of carriers– Technology relatedTechnology related•"Flicker noise" caused by material defects and "roughness"B. A. Wooley, B. Murmann EE214 Winter 2008-092
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Significance of Electronic Noise (1)Signal-to-Noise Ratio22signalsignaliPVSNRPV=∝noisenoiseB. A. Wooley, B. Murmann EE214 Winter 2008-093Significance of Electronic Noise (2)Th"fid lit "fltitiftd tid bth i SNRThe "fidelity" of electronic systems is often determined by their SNR– Examples•Audio systems•Imagers camerasImagers, cameras•Wireless and wireline transceiversElectronic noise directly trades with power dissipation and speedNoise has become increasingly important in modern technologies with reduced supply voltages–SNR ~ Vsignal2/Vnoise2~ (αVDD)2/Vnoise2TopicsHow to model noise of circuit componentsHow to calculate/simulate the noise performance of a complete circuit–In which circuits and applications does thermal noise matter?B. A. Wooley, B. Murmann EE214 Winter 2008-094