Introduction to the operational amplifier
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Introduction to the Operational Amplifier. μ A 741 OP AMP. Schematic -- 741 OP AMP. 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. Circuit Symbol for the OP AMP.

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Introduction to the Operational Amplifier

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Introduction to the Operational Amplifier

μA 741 OP AMP

ECE 201 Circuit Theory I


Schematic -- 741 OP AMP

ECE 201 Circuit Theory I


741 OP AMP – Package & Pin Layout

  • 2 Inverting Input

  • 3 Non-Inverting Input

  • 6 Output

  • 7 + Voltage Supply VCC

  • 4 – Voltage Supply VEE

  • 1 and 5 -- Offset Null

ECE 201 Circuit Theory I


Circuit Symbol for the OP AMP

Simplify to 3 terminals

ECE 201 Circuit Theory I


μA 741 OP AMP – Pin Identification

  • 2 Inverting Input

  • 3 Non-Inverting Input

  • 6 Output

  • 7 + Voltage Supply VCC

  • 4 – Voltage Supply VEE

  • 1 and 5 -- Offset Null

For simplicity, use only pins 2, 3, and 6.

ECE 201 Circuit Theory I


Terminal Voltages

ECE 201 Circuit Theory I


Terminal Currents

ECE 201 Circuit Theory I


Voltage Transfer Characteristic

ECE 201 Circuit Theory I


ECE 201 Circuit Theory I


Ideal OP AMP (Open Loop)

A = “open-loop” gain

A

ECE 201 Circuit Theory I


Connect Rf -- “Negative Feedback”

ECE 201 Circuit Theory I


Inverting Amplifier

ECE 201 Circuit Theory I


Analysis Using the Ideal OP AMP

“Virtual” ground

ECE 201 Circuit Theory I


Analysis continued

ECE 201 Circuit Theory I


Non-Inverting Amplifier

ECE 201 Circuit Theory I


Analysis Using the Ideal OP AMP

“Virtual Short

ECE 201 Circuit Theory I


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