Lect8_Introduction to Distortion Analysis(IV)

# Lect8_Introduction to Distortion Analysis(IV) - ECE 620...

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ECE 620 Introduction to RF Integrated Circuits Prof. Waleed Khalil Lecture Introduction to Distortion Analysis (IV) 8 1

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Outline Intermodulation Linearity of Cascaded Stages Spurious-free Dynamic Range 2
3 rd order Intermodulation, IM 3 3 3 rd order IM (IM 3 ) Power in sidebands 2 ω 1 - ω 2 ω 2 - ω 1 relative to the single tones* ω 1 , ω 2 Signals amp. A 1 and A 2 are set equal, A 1 = A 2 = A 2 1 3 1 3 3 rd 3 4 3 4 3 fund. of Amp. intermod. order 3 of Amp. A A A IM α = = = dB D IM A HD 10 3 H 4 3 3 2 1 3 + = ω 1 2 ω ω 1 ω 2 1 - ω 2 2 - ω 1 IM 3 A Gain Compresion 1 A 4 3 3 3 A * Assume no gain compression, 4 9 2 3 1 A α>>

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3 rd Order Intercept Point, IP 3 4 Assume no gain compression IP 3 is defined as extrapolation point where power in 2 ω 1 - ω 2 ω 2 - ω 1 sidebands is equal to power of fund. (i.e. IM 3 = 0 dB) IM 3 is calculated based on IP 3 measurement for given input, A IIP 3 and OIP 3
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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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Lect8_Introduction to Distortion Analysis(IV) - ECE 620...

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