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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. 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.

The output voltage Vout is a sum of the input voltages with weighting factors given by the values of the resistors. If the input resistors are equal R1=R2=R3=R, Equation (1.3) becomes out (in12in in3 RF VVVV) R =− + + (1.4) The output voltage is thus the sum of the input voltages with a …

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