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.
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
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
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
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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