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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. Chaniotakis and Cory. Spring 2006 Page 1 Operational Amplifier Circuits as Computational Devices So far we have explored the use of op amps to multiply a signal by a constant.

Ohm’s law and noting that the voltage at node N1 is zero (ideal op-amp rule) Equation (1.1) becomes 123 123 VVin in Vin Vout R RRRF ++=− (1.2) 1 The term operational amplifier was first used by John Ragazzini et. al in a paper published in …

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