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ME 6405 – Intro to Mechatronics Operational Amplifiers
9/17/2018 A Gogia, Sandhu, Koenig production
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A Gogia, Sandhu, Koenig production
Table of Content Overview Theory Basic circuits Advantages / Disadvantes Applications Overview Theory of an OP-AMP Basic circuits Advantages / Disadvantages Applications 9/17/2018 A Gogia, Sandhu, Koenig production
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A Gogia, Sandhu, Koenig production
Overview Overview Theory Basic circuits Advantages / Disadvantes Applications Definition: A standard analog circuit component with two inputs, one output and a very high voltage gain.1 Typically used for amplification, impedance matching and mathematical operations 9/17/2018 A Gogia, Sandhu, Koenig production
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A Gogia, Sandhu, Koenig production
History of the OP AMP Overview Theory Basic circuits Advantages / Disadvantes Applications Developed in the early 1940s Before the invention of the transistor made of vaccum tubes Became smaller with tranisistors Today small, inexpensive integrated circuits 9/17/2018 A Gogia, Sandhu, Koenig production
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A Gogia, Sandhu, Koenig production
Schematics of an OP AMP Overview Theory Basic circuits Advantages / Disadvantes Applications Circuit Design of an OP AMP 9/17/2018 A Gogia, Sandhu, Koenig production
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Pin assignment of the IC
Overview Theory Basic circuits Advantages / Disadvantes Applications Pin Configuration (1) Offset (Typically Not Used) (2) Inverting Input (3) Non-Inverting Input (4) Low Supply (5) Offset (Typically Not Used) (6) Output (7) High Supply (8) Not Connected 9/17/2018 A Gogia, Sandhu, Koenig production
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Properties of an OP-AMP
Properties of the ideal OP-AMP Rin is infinite Rout is zero Amplification Vout / Vin is infinite Unlimited bandwidth Zero output voltage at zero input difference Properties in reality Finite input resistance Small, but not zero output resistance Finite gain / Saturation Finite bandwidth Overview Theory Basic circuits Advantages / Disadvantes Applications THE OP AMP WILL TRY TO MAKE THE VOLTAGE DIFFERENCE BETWEEN THE TWO INPUTS TO ZERO! THE CURRENT INTO THE OP AMP IS ALWAYS ZERO 9/17/2018 A Gogia, Sandhu, Koenig production
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Typical Values of an OP AMP
Overview Theory Basic circuits Advantages / Disadvantes Applications Property Ideal Real Voltage Gain ∞ Input Resistance Input Current ∞ 0 A 106 10-12 – 10-8 A Output Resistance 0 100 – 1000 Bandwidth Phaseshift at high frequencies 9/17/2018 A Gogia, Sandhu, Koenig production
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Basic circuits Overview Theory Basic circuits Advantages / Disadvantes Applications Comparator e.g. temperature sensor Linear amplifier Linear inverting amplifier Impedance matching Summing Amplifier Subtractor Integrator Differentiator Schmitt Trigger e.g. two stage comperator 9/17/2018 A Gogia, Sandhu, Koenig production
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Nonlinear Usage - Comparator
Overview Theory Basic circuits Advantages / Disadvantes Applications The nonlinear usage always works without feedback Example with reference voltage UN = 0 9/17/2018 A Gogia, Sandhu, Koenig production
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A Gogia, Sandhu, Koenig production
Linear Usage Overview Theory Basic circuits Advantages / Disadvantes Applications 9/17/2018 A Gogia, Sandhu, Koenig production
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A Gogia, Sandhu, Koenig production
Inverting Amplifier Overview Theory Basic circuits Advantages / Disadvantes Applications Input impedance infinite, therefore no current in the OP AMP V+ - V- = 0 9/17/2018 A Gogia, Sandhu, Koenig production
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Non Inverting Amplifier
Overview Theory Basic circuits Advantages / Disadvantes Applications Input impedance infinite, therefore no current in the OP AMP V+ = V- 9/17/2018 A Gogia, Sandhu, Koenig production
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A Gogia, Sandhu, Koenig production
Summing Amplifier Overview Theory Basic circuits Advantages / Disadvantes Applications Input impedance infinite, therefore no current in the OP AMP V+ - V- = 0 9/17/2018 A Gogia, Sandhu, Koenig production
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Impedance matching Overview Theory Basic circuits Advantages / Disadvantes Applications Vin= Vout OP AMP tries to make the voltage difference between the inverting and the non inverting input to zero 9/17/2018 A Gogia, Sandhu, Koenig production
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Subtracting Amplifier
Overview Theory Basic circuits Advantages / Disadvantes Applications 9/17/2018 A Gogia, Sandhu, Koenig production
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A Gogia, Sandhu, Koenig production
Integrator Overview Theory Basic circuits Advantages / Disadvantes Applications Input impedance infinite, therefore no current in the OP AMP V+ - V- = 0 9/17/2018 A Gogia, Sandhu, Koenig production
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A Gogia, Sandhu, Koenig production
Integrator (II) Overview Theory Basic circuits Advantages / Disadvantes Applications Integrate 9/17/2018 A Gogia, Sandhu, Koenig production
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A Gogia, Sandhu, Koenig production
Differentiator Overview Theory Basic circuits Advantages / Disadvantes Applications Make the same calculation as with the integrator, just switch the resistor and the capacitor 9/17/2018 A Gogia, Sandhu, Koenig production
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Schmitt Trigger Overview Theory Basic circuits Advantages / Disadvantes Applications Two stage level detector 9/17/2018 A Gogia, Sandhu, Koenig production
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Advantages / Disadvantages
Overview Theory Basic circuits Advantages / Disadvantes Applications Advantages: cheap, easy to use, effective Disadvantages: Ideal not possible, phase shift at high frequencies Applications: A/D conversion, Filtering, any digital circuit 9/17/2018 A Gogia, Sandhu, Koenig production
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Applications – D/A Converter
Overview Theory Basic circuits Advantages / Disadvantes Applications Picture from Class Lecture D/A Conversion 9/17/2018 A Gogia, Sandhu, Koenig production
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A Gogia, Sandhu, Koenig production
Low Pass Overview Theory Basic circuits Advantages / Disadvantes Applications 9/17/2018 A Gogia, Sandhu, Koenig production
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Application - Rectifier
Overview Theory Basic circuits Advantages / Disadvantes Applications The Schmitt Trigger can be used to rectify a signal in order to get a clock 9/17/2018 A Gogia, Sandhu, Koenig production
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Sources 1 Pictures of example circuits taken from Some pictures taken from Garcia-Rivera, Newby, Rogge, Presentation on the 25th of September 2003 in the ME 6405 class ( 9/17/2018 A Gogia, Sandhu, Koenig production
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A Gogia, Sandhu, Koenig production
Questions? 9/17/2018 A Gogia, Sandhu, Koenig production
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9/17/2018 A Gogia, Sandhu, Koenig production
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