NiederrauschenVerstärker

A NiederrauschenVerstärker, often translated as a low-noise amplifier or LNA, is a type of electronic amplifier that increases the amplitude of a signal while introducing minimal additional noise. This is crucial in applications where the signal being amplified is very weak, such as in radio receivers, satellite communications, and sensitive scientific instruments. The primary goal of an LNA is to achieve a high signal-to-noise ratio (SNR) at its output, ensuring that the original signal remains discernible from any amplified noise.

The performance of an LNA is typically characterized by its noise figure, which quantifies how much the amplifier degrades the SNR. A lower noise figure indicates a better performance. LNAs are designed to have a low input impedance and a high gain, allowing them to effectively capture and amplify faint signals without overwhelming them with their own internal noise. They are often placed as close as possible to the signal source to minimize signal loss before amplification. Various circuit topologies and specialized components are employed to achieve the desired low-noise characteristics.