lavestøyforsterker

Lavestøyforsterker, often abbreviated as LNA, is a type of electronic amplifier designed to increase the amplitude of a weak signal while adding minimal noise to the signal. This is crucial in applications where the initial signal is very faint, such as in radio receivers, satellite communication systems, and sensor interfaces. The primary goal of an LNA is to achieve a high signal-to-noise ratio (SNR) at its output, meaning the amplified signal retains as much of its original information content relative to any introduced noise as possible.

LNAs are typically placed as close as possible to the signal source to amplify the signal before it is degraded by other components or transmission lines. The noise performance of an LNA is characterized by its noise figure, which quantifies the degradation of the SNR caused by the amplifier. A lower noise figure indicates a better performing LNA. Various design techniques, including the use of low-noise transistors and careful impedance matching, are employed to minimize noise generation. The frequency range of operation, gain, linearity, and power consumption are also important parameters when selecting an LNA for a specific application.