1. 1 OPerational AMPlifier OPAMP Bollen

2. 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

3. 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

4. 4 Bollen

5. 5 OPAMP, symbol and package Bollen

6. 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

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

8. 8 Bollen OPAMP, power connections

9. 9 Bollen OPAMP, Vcc and Vee, examples

10. 10 OPAMP, remember Bollen

11. 11 OPAMP, real world Bollen

12. 12 OPAMP, feedback Bollen

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

14. 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

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

16. 16 Buffer, transfer curve Bollen

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

18. 18 Inverting amplifier Bollen

19. 19 Inverting amplifier Bollen

20. 20 Inverting amplifier Bollen

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

22. 22 Non-inverting amplifier Bollen

23. 23 Non-inverting amplifier Bollen

24. 24 Non-inverting amplifier Bollen

25. 25 Summing junction Bollen

26. 26 Summing amplifier Bollen

27. 27 3 bit DA Summing amplifier Bollen

28. 28 6 bits DA Summing amplifier Bollen

29. 29 Summing amplifier Bollen

30. 30 Variable amplifier Bollen

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

32. 32 Bollen

33. 33 Instrumentation amplifier Bollen

34. 34 Instrumentation amplifier Bollen Rin = ∞ Gain = R1