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1. Introduction: Operational amplifiers (opamps) are usually used in two different modes, mainly the positive feedback mode and the negative feedback mode. These two modes have very different effects on the input-output relationship of opamps. This report will be looking at the effects of negative feedback on inverting and non-inverting operational amplifiers, the extent of proportionality of the input-output relationship of an opamp with negative feedback, and the Schmitt trigger and oscillator to illustrate the non-linear input-output relationships of opamps. 2. Theory: An ideal op-amp draws no current and the output voltage is only dependent on the difference between the two input voltages. The output voltage is determined by: VOUT = A(V+ - V-), where A is open loop voltage gain. The open loop voltage gain is defined as the gain of the opamp when the output terminal is not connected to any of the input terminals. For the ideal case, the difference...

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