Lect6_Introduction to Distortion Analysis(II)

Lect6_Introduction to Distortion Analysis(II) - ECE 620...

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Unformatted text preview: ECE 620 Introduction to RF Integrated Circuits Prof. Waleed Khalil Lecture Introduction to Distortion Analysis(II) 6 1 Outline Gain Compression Desensitization and Blocking Intermodulation 2 Gain Compression Assuming 3 / 1 < 0, gain drops as input A increases 1-dB compression point ( A 1-dB ): Input level where gain drops by 1 dB IP 1-dB : Input power at input = A 1-dB OP 1-dB : Output power at input = A 1-dB 3 + + + = ) cos( 4 3 1 ) ( 1 1 2 3 t A A t v out 20 log v out 20 log A 1 dB A 1-dB 2 l o g 1 A 3 1 1 1 2 3 1 2 3 1 2 3 1 145 . 11 . 4 3 1 4 3 1 log 20 1 log 20 4 3 log 20 = = = + = + dB A A A A Intermodulation Impact of nonlinearity on two-tone vs. single tone system 4 ) cos( ) cos( ) ( 2 2 1 1 t A t A t v in + = Desired Interferer ( ) ( ) ) cos( 2 3 4 3 ) cos( 2 3 4 3 : , ) 2 cos( 4 3 ) 2 cos( 4 3 : 2 ) 2 cos( 4 3 ) 2 cos( 4 3 : 2 ) cos(...
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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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Lect6_Introduction to Distortion Analysis(II) - ECE 620...

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