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EE 230 Lecture 11 Spring 2010

# EE 230 Lecture 11 Spring 2010 - EE 230 Lecture 11 Basic...

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EE 230 Lecture 11 Basic Feedback Configurations Input/Output Impedance Inverting Amplifiers Summing Amplifiers

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Quiz 9 Determine the voltage gain of this amplifier. Assume the Op Amp is ideal
And the number is ? 1 3 8 4 6 7 5 2 9 ?

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Quiz 9 Determine the voltage gain of this amplifier. Assume the Op Amp is ideal Solution: R 2 R 1 2 VF 1 R A = 1+ = 31 R
Reminder: Exam 1 on Wednesday Students may bring one sheet (front and back) of notes There will be no 11:00 lectures next week but will resume the week of Feb 14 I will have limited email access after noon today so return email messages may be delayed Laboratory 4 - Purpose

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Finite Gain Feedback Amplifiers Consider the following circuit For R IN = and R 0 =0, this is an EXACT representation of Black feedback structure A β 1 A A FB + = FB 1 A β ± This is a Voltage Feedback Amplifier For A large Review from Last Time
Finite Gain Feedback Amplifiers Consider the following circuit FB 1 A β ± 1 1 2 R β = R +R A β 1 A A FB + = 1 2 FB 1 R 1 A β R = + ± Observe this serves as a basic finite-gain noninverting amplifier Review from Last Time

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Basic Noninverting Amplifier 1 2 FB 1 R A R = + Gain can be accurately determined by resistors Circuit has excellent linearity Review from Last Time
Basic Noninverting Amplifier Will you impress your boss if you were to use the more accurate gain expression instead of the approximation OUT 2 IN 1 V R 1+ V

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EE 230 Lecture 11 Spring 2010 - EE 230 Lecture 11 Basic...

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