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Published byEthan Miller Modified over 5 years ago

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1 OPerational AMPlifier OPAMP Bollen

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2 AGENDA Bollen OPAMP COMPONENT Overview Symbol and package Connections Internal Power connections Vcc and Vee examples Remmber 5 ideal rules Remember real opamp Feedback BUFFER nity Gain, +1 Amp, Voltage Follower Transfer curve Application INVERTING AMPLIFIER Virtual ground NON-INVERTING AMPLIFIER SUMMING AMPLIFIER Summing junction DA SUMMING AMPLIFIER VARIABLE AMPLIFIER DIFFERENTIAL AMPLIFIER

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3 OPAMP Bollen Course content OPAMP Analog ElectronicsT.E. Price OPAMP componentpage xxx Non- inverting amplifierpage 427 Inverting amplifierpage 433 Summing amplifierpage xxx Difference amplifierpage 441 Problems:chapter 13; 3,7,10,11,12,14,15

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4 Bollen

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5 OPAMP, symbol and package Bollen

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6 OPAMP, connections Bollen +V = Vcc = most positive power supply -V = Vee = most negative power supply V+ = non-inverting input V- = inverting input Output = output

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7 OPAMP, internal Bollen +V = Vcc -V = Vee V+ = non-inverting input V- = inverting input Output = output

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8 Bollen OPAMP, power connections

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9 Bollen OPAMP, Vcc and Vee, examples

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10 OPAMP, remember Bollen

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11 OPAMP, real world Bollen

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12 OPAMP, feedback Bollen

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13 OPAMP, feedback Bollen Uout = A u (U + -U - ) Uout = 200.000 (U + -U - ) Differential input voltage= ΔU = 0 !!! Only for negative Feedback

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14 OPAMP, feedback Bollen The circuit will quickly reach a point of stability the output voltage is just the right amount of differential voltage accoding to the Au. Taking the op-amp's output voltage and coupling it to the inverting input is a technique known as negative feedback, and it is the key to having a self-stabilizing system. Because the op-amp's gain is so high, the voltage on the inverting input can be maintained almost equal to Vin. The output terminal, and the system holds there in balance. The higher the op-amp differential gain, the closer that differential voltage will be to zero. ΔU = 0 Only For Negative Feedback

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15 Buffer, Unity Gain +1 Voltage follower Bollen Rin = ∞ Rout = 0 Uin = Uout

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16 Buffer, transfer curve Bollen

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17 Buffer, application Bollen Accurate voltage divider, Rload = ∞, Iin = 0

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18 Inverting amplifier Bollen

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19 Inverting amplifier Bollen

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20 Inverting amplifier Bollen

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21 Virtual Ground Bollen Virtual = no current Ground = 0 volt

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22 Non-inverting amplifier Bollen

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23 Non-inverting amplifier Bollen

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24 Non-inverting amplifier Bollen

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25 Summing junction Bollen

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26 Summing amplifier Bollen

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27 3 bit DA Summing amplifier Bollen

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28 6 bits DA Summing amplifier Bollen

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29 Summing amplifier Bollen

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30 Variable amplifier Bollen

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31 Differential amp Bollen For R1 = R3 And R2 = R4

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32 Bollen

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33 Instrumentation amplifier Bollen

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34 Instrumentation amplifier Bollen Rin = ∞ Gain = R1

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