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EE 230 Lecture 16 Spring 2010

EE 230 Lecture 16 Spring 2010 - EE 230 Lecture 16 Nonideal...

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EE 230 Lecture 16 Nonideal Op Amp Characteristics
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Differential Amplifiers Instrumentation Amplifier Can reduce effects of dc offset if gain must be very large Must pick C to that frequencies of interest are in passband Review from Last Time
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Impedance Converters ( ) 1 1 2 X 2 V G +G = V G ( ) 1 1 X 3 I = V -V G 2 IN 1 3 Z Z = - Z Z Observe this input impedance is negative! Review from Last Time
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Impedance Converters 1 3 5 IN 2 4 Z Z Z Z = Z Z If Z 1 =Z 3 =Z 4 = Z 5 =R and Z 2 =1/sC ( ) 2 IN Z = R C s This is an inductor of value L=R 2 C If Z 2 =R 2 , Z 3 =R 3 , Z 4 =R 4 , Z 5 =R 5 and Z 1 =1/sC 3 5 IN 2 4 R R Z = sCR R This is a capacitor of value 2 4 EQ 3 5 R R C = C R R (can scale capacitance up or down) If Z 2 =Z 4 = Z 5 =R and Z 1 =Z 3 =1/sC ( ) 3 2 2 IN Z = R C s This is a “super” capacitor of value 3 2 R C This circuit is often called a Gyrator Review from Last Time
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Nonideal Properties of Operational Amplifiers In even the most basic applications, the laboratory performance of the circuit often differs dramatically from what is predicted for some op amps. With proper knowledge of the characteristics of the op amp, designers can usually design circuits that behave almost like what is expected with ideal op amps Essential to know nonideal properties of the op amp and how to manage them to be an effective design engineer
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Nonideal Properties of Operational Amplifiers Example: Desired input and output waveforms
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Nonideal Properties of Operational Amplifiers Example: Desired output waveforms V DD t V OUT (t) V SS What can happen:
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Nonideal Properties of Operational Amplifiers Example: Desired output waveforms What can happen: V DD t V SS V DD t V SS
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Nonideal Properties of Operational Amplifiers Example: Desired output waveforms What can happen: V DD t V SS V DD t V SS
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Some of the more common nonideal effects in Op Amp circuits Will try to identify the source
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