EE40Lecture 24Venkat AnantharamIdeal Op-Amp Analysis: Inverting AmplifierInverting AmplifierSlide 1EE40 Spring 2008 Venkat AnantharamEE40Lecture 24Venkat Anantharam3/31/08 Reading: Chap. 14: Operational Amplifiers.Slide 2EE40 Spring 2008 Venkat AnantharamIdeal Op-Amp Analysis: Inverting AmplifierR2I2VOUT-VRR1RLVIN021=−+−RVVRVVOUTRINRVoltage is VROnly two currents for KCLYes Negative Feedback is present in circuit!()RinROUTVVRRVV −−=12Inverting Amplifier with reference voltageSlide 3EE40 Spring 2008 Venkat AnantharamInverting Amplifier12 1222122110, 02.()( )ovinin outooinvClosed loop gain Avvv iiUse KCL At Nodevv v viRRRvvRvInput impedance Ri==== ==−−===−==• Negative feedback Æchecked• Use summing-point constraintR2_+vin+-R1Ideal voltage source – independent of load
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