Lecture05_Electronic_Noise_2up

Lecture05_Electronic_Noise_2up - EECS240 Spring 2008...

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EECS240 – Spring 2008 Lecture 5: Electronic Noise Elad Alon Dept. of EECS EECS240 Lecture 5 2 Electronic Noise Why is noise important? Sets minimum signals we can deal with – often sets lower limit on power Signal-to-noise ratio Signal Power P sig ~ (V DD ) 2 Noise Power P noise ~ k B T/C SNR = P sig / P noise Technology Scaling V DD goes down Æ lower signal Increase C to compensate Æ increases power
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EECS240 Lecture 5 3 Types of “Noise” Interference Not “fundamental” – deterministic Signal coupling Capacitive, inductive, subtrate, etc. Supply noise Device noise Caused by discreteness of charge “fundamental” – thermal noise “manufacturing process related” – flicker noise EECS240 Lecture 5 4 Noise in Amplifiers All amplifiers generate noise Comes from carrier random thermal motion and discreteness of charge Noise is random Has to be treated statistically – can’t predict actual value Deal with mean (average), variance, spectrum
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EECS240 Lecture 5 5 Thermal Noise of a Resistor Origin: Brownian Motion Thermally agitated particles E.g. ink in water, electrons in a conductor Available noise power: Noise power in bandwidth f delivered to a matched load Example: f = 1Hz Æ P N
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This note was uploaded on 05/23/2008 for the course EECS 240 taught by Professor Eladalon during the Spring '08 term at University of Calgary.

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Lecture05_Electronic_Noise_2up - EECS240 Spring 2008...

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