Positive Feedback

Posted on Mar 18, 2013

The use of positive feedback is useful for producing oscillators. The condition for positive feedback is that a portion of the output is combined in phase with the input. For an amplifer with positive feedback the gain is given by the expression below.

Practically speaking, the gain which applies at low signal amplitudes will be reduced until the output amplitude reaches some constant value. However, that limiting value will be independent of input, allowing the circuit to produce a designed output.

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