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Operational Amplifier Circuits - MIT OpenCourseWare

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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. 0IpIn==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 0IpIn==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.

input of the op-amp is equal to Vin. The current through the load resistor, RL, the transistor and R is consequently equal to Vin/R. We put a transistor at the output of the op-amp since the transistor is a high current gain stage (often a typical op-amp has a

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