EE 230 Lecture 22 Spring 2010

EE 230 Lecture 22 - EE 230 Lecture 22 Nonlinear Op Amp Applications Waveform Generators Quiz 16 Plot the transfer charactristics of the following

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EE 230 Lecture 22 Nonlinear Op Amp Applications – Waveform Generators
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Quiz 16 Plot the transfer charactristics of the following circuit. Assume the op amp has V SATH =12V and V SATL =-12V.
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And the number is ? 1 3 8 4 6 7 5 2 9 ?
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Quiz 16 Plot the transfer charactristics of the following circuit. Assume the op amp has V SATH =12V and V SATL =-12V. SATH θ V SATL θ V Solution Define 1 12 R θ = R+R
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Usually the good circuit Usually the bad circuit If ideal op amps both have gain 2 FB 1 R A= 1 + R Before trashing the “bad” circuit which we saw was unstable, lets see if it has any useful properties! This circuit is unstable ! Review from Last Lecture
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Comparator with Hysteresis 1 12 R θ = R+R SATH θ V SATL θ V Review from Last Lecture
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Comparator with Hysteresis 1 12 R θ = R+R SATL IN SATH Hysteresis Region SATH 2 1 V R 1+ R SATH 2 1 V R 1+ R OUT Review from Last Lecture
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Modifications of Comparator with Hysteresis 1 12 R θ = R+R V OUT R 2 R 1 1 R θ = V IN V REF V SATL V IN V SATH Hysteresis Region V OUT SATH - θ V SATL - θ V V OUT R 2 R 1 1 2 R θ = R V IN V SATL V IN V SATH Hysteresis Region V OUT ( ) REF SATH 1- θ V+ θ V ( ) REF SATL 1- θ θ V V SATL V IN V SATH Hysteresis Region V OUT SATH θ V SATL θ V Many other ways to control position and size of hysteresis window Note this is the basic inverting amplifier with op amp terminals interchanged Review from Last Lecture
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Usually the good circuit Usually the bad circuit If ideal op amps both have gain 2 FB 1 R A= 1 + R This circuit is unstable !
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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 22 - EE 230 Lecture 22 Nonlinear Op Amp Applications Waveform Generators Quiz 16 Plot the transfer charactristics of the following

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