# lecture09 - Lecture #9 (with Prof. Neureuther) ANNOUNCEMENT...

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Lecture 9, Slide 1 EECS40, Fall 2003 Prof. King Lecture #9 ANNOUNCEMENT • Bring your own copy of Lecture #10 notes (posted on the class website) to class on Wednesday! (No hardcopies will be handed out.) OUTLINE • The operational amplifier (“op amp”) • Feedback • Comparator circuits • Ideal op amp • Unity-gain voltage follower circuit Reading Chapter 5.1-5.2 (with Prof. Neureuther) Lecture 9, Slide 2 EECS40, Fall 2003 Prof. King Solution to Superposition Example Find V o : 16V V 24 4 2 4 = + = o V + 24 V 2 4 4 A 4 V + – + Find contribution of 24 V source Find contribution of 4 A source Find contribution of 4 V source 24V 2 4 + V o 4 2 4A i + V o ′′ V 3 16 ) 4 ( A 3 4 A 4 4 2 2 = = = + = i V i o + – 2 4 4V + V o ′′′ V 3 8 -4V) ( 4 2 4 = + = o V V 8 = + + = o o o o V V V V

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Lecture 9, Slide 3 EECS40, Fall 2003 Prof. King Final Comment on Thévenin Equivalent If there are no independent sources in a circuit, V Th = 0. – If there are dependent sources in the circuit, we need to apply an external voltage in order to determine R Th . Example : Circuit used in R Th Calculation Example #2, Lecture 8: TEST 25 8 V V x = I TEST + V TEST 80 0 20 16 40 TEST x x x V i V V i i V = = + : i of Definition : x node to KCL Applying V x 60 40 20 TEST + = i V V V TEST x = = 4 75 TEST TEST Th I V R Lecture 9, Slide 4 EECS40, Fall 2003 Prof. King The Operational Amplifier • The operational amplifier (“ op amp ”) is a basic building block used in analog circuits. – Its behavior is modeled using a dependent source.
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## This note was uploaded on 08/23/2009 for the course EECS 40 taught by Professor Chang-hasnain during the Fall '08 term at University of California, Berkeley.

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lecture09 - Lecture #9 (with Prof. Neureuther) ANNOUNCEMENT...

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