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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.

The feedback network of an op-amp circuit may contain, besides the resistors considered so far, other passive elements. Capacitors and inductors as well as solid state devices such as diodes, BJTs and MOSFETs may be part of the feedback network. In the general case the resistors that make up the feedback path may be replaced by

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