EE 230 Lecture 10 Spring 2010

EE 230 Lecture 10 Spring 2010 - EE 230 Lecture 10 Feedback...

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EE 230 Lecture 10 Feedback Concepts Basic Feedback Configurations
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Quiz 8 In what year did Black introduce the concept of Feedback?
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And the number is ? 1 3 8 4 6 7 5 2 9 ?
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Quiz 8 In what year did Black introduce the concept of Feedback? 1927
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Obtaining R IN , R OUT and A V in unliateral two-ports IN OUT TEST1 IN T1 V R= I TEST2 OUT T2 V I 0TEST1 V TEST1 V A= V Review from Last Time
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Amplifiers – where do they come from? It is a challenge to build amplifiers that have good linearity, accurate gains, and that operate over a wide range of frequencies Electronic components that are used to build amplifiers Vacuum tubes (1878) Bipolar transistors (1948) MOSFETs (~1920 conceived, ~1970 implemented) Almost all electronic amplifiers are built with one of these three types of devices Review from Last Time
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Amplifiers – where do they come from? It is a challenge to build amplifiers that have good linearity, accurate gains, and that operate over a wide range of frequencies Engineers struggled for nearly 5 decades struggling to build amplifiers with Accurate Gains Good Linearity Good frequency response Minimal impact on insertion Review from Last Time
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The feedback concept A β 1 A A FB + = FB 1 A β ± Feedback has shifted the performance requirements from the A amplifier to the β amplifier. The performance improvements in most things of interest is often improved by a factor of 1+A β (will show this later) D=1+A β is called the desensitivity Example: If A=10^5 and β =1/2 2 FB A ± D=1+50,000 50,000 Review from Last Time
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The Operational Amplifier The ideal Op Amp ( ) 1 2 OUT V V A V = A = “E” source model in SPICE or SPECTRE
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This note was uploaded on 02/01/2012 for the course EE 230 taught by Professor Mina during the Fall '08 term at Iowa State.

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EE 230 Lecture 10 Spring 2010 - EE 230 Lecture 10 Feedback...

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