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Operational Amplifier Circuits

Operational Amplifier Circuits Review: Ideal Op-amp in an open loop configuration RoRi+_VpVnVi+_AViVo+IpIn An ideal op-amp is characterized with infinite open loop gain A The other relevant conditions for an ideal op-amp are: 1. 0 IpIn==2. Ri= 3. 0Ro= Ideal op-amp in a negative feedback configuration When an op-amp is arranged with a negative feedback the ideal rules are: 1. : input current constraint 0 IpIn==2. : input voltage constraint VnVp= These rules are related to the requirement/assumption for large open-loop gain , and they form the basis for op-amp circuit analysis. A The voltage Vn tracks the voltage Vp and the control of Vn is accomplished via the feedback network.

Difference Amplifier This fundamental op amp circuit, shown on Figure 2, amplifies the difference between the input signals. The subtracting feature is evident from the circuit configuration which shows that one input signal is applied to the inverting terminal and the other to the non-inverting terminal. Vout Vin2 Vin1 I1 I2 IF N1 R1 R2 R3 R4 ...

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