Operational Amplifier Questions
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Please see attachment for diagrams.
1. Inverting Amplifier Configuration
Assume an ideal op-amp. Two "rules" below:
I. Current into op-amp is zero.
II. The output attempts to do whatever possible to keep the input voltages the same.
If R_3 = 1kOhm and R_1 = R_2 = 470 Ohm, what is the voltage gain?
2. Inverting Amplifier Configuration
For the second circuit attached, find the closed-loop gain if the open-loop is not infinite (ie. you can not assume that v- = v+. If A = 100,000, what is the value of the closed loop gain? What is the percent error in assuming A is infinite?)
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Solution Summary
A step by step solution is provided in an attached 2-page Word document with diagrams and calculation, looking at the cases of an ideal and not ideal OP-AMP as well as how to calculate error for these kinds of calculations.
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