Lect3_RF Block and System Design Parameters(II)

Lect3_RF Block and System Design Parameters(II) - ECE 620...

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ECE 620 Introduction to RF Integrated Circuits Prof. Waleed Khalil Lecture RF Block and System Design Parameters(II) 3 1
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Outline Noise Analysis Noise Figure Cascaded NF Sensitivity 2
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EM radiation of hot objects in Universe (e.g. Sun) “black-body” radiation Model Rayleigh-Jeans Equipartition of Energy Law: Corrected by Planck’s quantum formula 3 Noise Sources: Blackbody Noise   3 4 W/m 2 kT c S    kT hf kT c e hf c S kT hf  , 2 ~ W/m 1 2 4 3 4
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White noise at mm-wave frequencies ( hf << kT ) Noise power depends on ANT effective noise temperature, T a @ Room temperature (T=290 K): Thermal noise sets a lower limit on achievable noise performance in a radio link. 4 Noise Power (Frequency Domain) GHz K T h kT f kT hf kTB P o o ) ( 20 W T s T a W B kT P a dBm/Hz 174 P
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5 Noise in Passive Networks Nyquist experiment: Rresonant cavity concepts and the Equipartition Law The available noise power from any passive network is given by kTB Noise representation in time domain Equivalent RMS noise voltage, v n ( f ) : R kTB
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This note was uploaded on 11/21/2011 for the course ECE 620 taught by Professor Khalil during the Fall '11 term at Ohio State.

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Lect3_RF Block and System Design Parameters(II) - ECE 620...

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