Lect5_Introduction to Distortion Analysis(I)

Lect5_Introduction to Distortion Analysis(I) - ECE 620...

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ECE 620 Introduction to RF Integrated Circuits Prof. Waleed Khalil Lecture Introduction to Distortion Analysis (I) 5 1
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Outline Harmonic Distortion Gain Compression 2
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Types of Systems Memory-less nonlinear system (e.g. LNAs) System responds instantaneously to the input Output does not depended on previous input Linear, time-invariant system (e.g. R, C and L circuits) Linear, time-variant system (e.g. comm. channels) Nonlinear, time-variant system (e.g. power amp.) Volterra Series 3 + + + = ) ( ) ( ) ( ) ( 3 3 2 2 1 t v t v t v t v in in in out α ) ( ) ( ) ( t v t h t v in out = ) ( ) , ( ) ( ) , ( ) ( t v t h t v t h t in out = τ δ ECE 620
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Linear vs. Non Linear Amplifiers 4 Linear Amplifier (Ideal): Amplifier non-ideality (nonlinearity) can be modeled as power series For v in << V sat : in out v v = α 3 3 2 2 1 ) ( in in in out v v v t v + + = α gain signal small is ; ) ( 1 1 in out v t v α v out v out v in Linear range V sat v in Odd symmetry, aka. differential, balanced ) ( ) ( 0 ) ( 2 3 3 2 2 1 in out
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Lect5_Introduction to Distortion Analysis(I) - ECE 620...

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