1. ECE 201 Circuit Theory I1 Introduction to the Operational Amplifier μA 741 OP AMP

2. ECE 201 Circuit Theory I2 Schematic -- 741 OP AMP

3. ECE 201 Circuit Theory I3 741 OP AMP – Package & Pin Layout 2 Inverting Input 3 Non-Inverting Input 6 Output 7 + Voltage Supply V CC 4 – Voltage Supply V EE 1 and 5 -- Offset Null

4. ECE 201 Circuit Theory I4 Circuit Symbol for the OP AMP Simplify to 3 terminals

5. ECE 201 Circuit Theory I5 μA 741 OP AMP – Pin Identification 2 Inverting Input 3 Non-Inverting Input 6 Output 7 + Voltage Supply V CC 4 – Voltage Supply V EE 1 and 5 -- Offset Null For simplicity, use only pins 2, 3, and 6.

6. ECE 201 Circuit Theory I6 Terminal Voltages

7. ECE 201 Circuit Theory I7 Terminal Currents

8. ECE 201 Circuit Theory I8 Voltage Transfer Characteristic

9. ECE 201 Circuit Theory I9

10. 10 Ideal OP AMP (Open Loop) A A = “open-loop” gain

11. ECE 201 Circuit Theory I11 Connect R f -- “Negative Feedback”

12. ECE 201 Circuit Theory I12 Inverting Amplifier

13. ECE 201 Circuit Theory I13 Analysis Using the Ideal OP AMP “Virtual” ground

14. ECE 201 Circuit Theory I14 Analysis continued

15. ECE 201 Circuit Theory I15 Non-Inverting Amplifier

16. ECE 201 Circuit Theory I16 Analysis Using the Ideal OP AMP “Virtual Short