EE3110-AEC-2008-Feedback Amplifiers_r2

EE3110-AEC-2008-Feedback Amplifiers_r2 - EE3110: Analogue...

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: EE3110: Analogue Electronic Circuits Feedback Amplifiers 2. Feedback Amplifiers 1. Feedback Concepts Rashid: ch10 Boylestad: ch14 S i S S o S fb Lo ad Sou rce +- ) ( factor feedback function transfer Feedback S S o fb = ) ( gain loop open factor ion amplificat S S A o = fb i S S S KCL- = : function transfer loop closed A A S S AS S S A fb i o f + = + = = 1 gain loop A Gain stability Gain sensitivity A A A f + = 1 1 , 1 = A A A A For f ( 29 ( 29 2 2 1 1 1 1 1 A A A A dA dA f + = +- + = ( 29 A dA A A dA A dA dA f f f + = + = 1 1 1 2 Bandwidth Extension An amplifier with a high frequency response characterized by a single pole can be written as, + = H M s A s A 1 ) ( frequency dB upper gain band mid A Where H M 3---- With negative feedback ( 29 M H M M M H M f A s A A A s A s A s A s A + + + = + + = + = 1 1 1 1 1 ) ( 1 ) ( ) ( ( 29 M H H A frequency dB upper New + = 1 3- ' ( 29 M L L A frequency dB lower the for similarly + = 1 3- ' Non-linear Distortion Open loop distortion D Closed loop distortion D = D- A D D D A D- + + A D D + = 1 ' Noise Sensitivity Feedback can help reduce the effects of noise due to the...
View Full Document

This note was uploaded on 01/11/2011 for the course EE 3110 taught by Professor Wingshingchan during the Fall '08 term at City University of Hong Kong.

Page1 / 20

EE3110-AEC-2008-Feedback Amplifiers_r2 - EE3110: Analogue...

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online