Lecture_10

# Lecture_10 - Ideal Op Amp The current into both input...

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1 BME 311 Network Theory John X.J. Zhang, UT Austin 1 Ideal Op Amp • The current into both input terminals are zero • The voltage across the input terminals is equal to zero i 1 =0, i 2 =0 v 1 = v 2 BME 311 Network Theory John X.J. Zhang, UT Austin 2 Inverting Amplifier • Key feature – Input signal is applied at the inverting terminal – The feedback is applied at the inverting terminal i f v R R v 1 0 =

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2 BME 311 Network Theory John X.J. Zhang, UT Austin 3 Voltage Follower • Very high input impedance – buffer amplifier to isolate one circuit from another • Minimizes interaction • Eliminate inter-stage loading BME 311 Network Theory John X.J. Zhang, UT Austin 4 Summing Amplifier ) ( 3 3 2 2 1 1 0 v R R v R R v R R v f f f + + =
3 BME 311 Network Theory John X.J. Zhang, UT Austin 5 Difference/Differential Amplifier • Subtractor v 0 = v 2 -v 1 1 1 2 2 4 3 1 2 1 2 0 ) 1 ( ) 1 ( v R R v R R R R R R v + + = R 1 =R 2 R 3 =R 4 BME 311 Network Theory John X.J. Zhang, UT Austin

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## This note was uploaded on 09/28/2009 for the course BME 311 taught by Professor Zhang during the Spring '08 term at University of Texas.

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Lecture_10 - Ideal Op Amp The current into both input...

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