Återkopplingsresistor

Återkopplingsresistor is a Swedish term that translates to "feedback resistor" in English. It refers to a resistor used in electronic circuits, particularly in amplifiers and operational amplifiers, to provide a feedback path. This feedback path is crucial for controlling the gain, stability, and frequency response of the circuit.

In an operational amplifier, for instance, the output signal is typically fed back to one of the input terminals (usually the inverting input) through a feedback resistor. The ratio of the feedback resistor to the input resistor determines the amplifier's gain. By altering the values of these resistors, engineers can precisely set how much the input signal is amplified.

Beyond gain control, feedback resistors play a vital role in stabilizing circuits. They help to reduce distortion and noise, ensuring that the output signal is a faithful reproduction of the input, albeit amplified. The presence and value of the feedback resistor can significantly influence the bandwidth and transient response of an amplifier.

Different configurations of feedback exist, such as negative feedback, which is commonly used to stabilize amplifiers and reduce distortion, and positive feedback, which can be used in oscillators to create sustained oscillations. The choice and placement of the återkopplingsresistor are therefore fundamental design considerations in analog electronics.