Discussion
Consider the following statements about the feedback equation.
1. The denominator is one plus the loop gain for negative feedback
2. The closed-loop gain tends to the reciprocal of the fraction at high loop gain
3. The denominator is one minus the loop gain for positive feedback
Which of the statements given above is or are correct?
Answer: A
All three are correct, and between them they cover both signs of feedback and the limiting behaviour that makes negative feedback useful. The change of sign in the denominator is the whole difference between an amplifier and an oscillator, and the limiting form is why a closed-loop gain can be trusted to a resistor's tolerance. One equation, read three ways, is the foundation of the entire topic.
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