FeedbackVerstärkern

FeedbackVerstärkern, also known as feedback amplifiers, are electronic amplifiers that incorporate a portion of their output signal back to the input. This feedback loop is a fundamental concept in analog circuit design and can be implemented in various ways, either negatively or positively. Negative feedback, where a fraction of the output signal is subtracted from the input signal, is widely used to improve amplifier performance. It generally leads to increased stability, reduced distortion, a wider bandwidth, and a more predictable gain. The amount of negative feedback applied can be precisely controlled, allowing for fine-tuning of these characteristics. Positive feedback, on the other hand, adds a portion of the output signal to the input. While less common for general amplification, positive feedback is crucial for creating oscillators, where it sustains oscillations at a specific frequency. The design and analysis of feedback amplifiers involve understanding concepts like loop gain, stability criteria (such as the Barkhausen criterion for oscillators), and the impact of feedback on impedance. They are essential components in a vast array of electronic devices, from audio equipment to communication systems.