1. 741 Op-Amp Circuit
Section 8.1 (Razavi)

2. Equivalent Circuit of an Op-Amp
Characteristics:
Negligible input current
Large input AC resistance
Small AC output resistance Large Voltage Gain

3. Op-Amp as an Amplifier (non-inverting input) (inverting input)
Op-Amp is a circuit that amplifies the difference
between the inputs.

4. ST UA741CN Op-Amp

5. ST UA741 CN Schematic

6. Spec Sheet for ST UA741 CN

7. UA741 CN Specs (Cont.)

8. Topics Non-Inverting Amplifier Inverting Amplifier Integrator
Differentiator

9. Non-Inverting Amplifier (Ideal)
(Assumption: Ao is infinite)

10. Inverting Amplifier Input impedance: R2
Trade off: Input impedance versus voltage gain.

11. Virtual Ground Versus An Ordinary Ground
Node X is a virtual ground, but not an ordinary ground.
If X were an ordinary ground, current from Vin would be
diverted from R1since R1 represents a path of high impedance.

12. Differential Amplifier
If R1=R2 and Rf=Rg, then Vout/(V2-V1)=(Rf/R1)

13. Instrumentation Amplifier