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Operational Amplifier Circuits - MIT OpenCourseWare

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.

Operational Amplifier Circuits Review: Ideal Op-amp in an open loop configuration Ro Ri + _ Vp Vn Vi + _ AVi + Vo Ip In An ideal op-amp is characterized with infinite open–loop gain A→∞ The other relevant conditions for an ideal op-amp are: 1. Ip =In =0 2. Ri =∞ 3. Ro =0 Ideal op-amp in a negative feedback configuration

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