Lect7_Introduction to Distortion Analysis(III)

Lect7_Introduction to Distortion Analysis(III) - ECE 620...

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ECE 620 Introduction to RF Integrated Circuits Prof. Waleed Khalil Lecture Introduction to Distortion Analysis (III) 7 1
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Outline Intermodulation 2
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2 nd order Intermodulation, IM 2 2 nd order IM (IM 2 ) Power in sidebands ω 1 ± ω 2 relative to the single tones* ω 1 , ω 2 Signals amp. A 1 and A 2 are set equal, A 1 = A 2 = A 3 A A AA IM 1 2 1 2 nd 2 fund. of Amp. intermod. order 2 of Amp. α = = = dB D IM A HD 6 2 H 2 2 2 1 2 + = = * Assume no gain compression, 4 9 2 3 1 A α>> ω 1 2 ω ω 1 ω 2 ω 2 - ω 1 0 ω 2 + ω 1 2 1 IM2 DC Gain Compresion A 1 A 2 2 A
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Example: Low-IF/ Zero-IF Receiver GSM Band: ω o = 1930 MHz, ω 1 = (1930+0.4) MHz, ω 2 = (1930+0.6) MHz Low-IF IF=100 kHz Interferer at ω 2 - ω 1 =200 kHz Zero-IF (Direct Conversion) IF=0 Interferer at DC and ω 2 - ω 1 =200 kHz 4 ω ω 1 ω 2 desired ω o LO IF ω o +IF ω IF+ ω O - 2 ω 2 - ω 1 IF ω 2 + ω 1 2 1 0 1
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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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Lect7_Introduction to Distortion Analysis(III) - ECE 620...

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