Low Noise Amplifiers (LNA)

At Castle Microwave, we are able to offer a range of Low Noise Amplifiers and Ultra Low Noise Amplifiers, with frequencies ranging from 0.2GHz to 100GHz. These include broadband and narrow bandwidth devices with single power supply in a lightweight housing and with the appropriate coax or waveguide interfaces using a variety of technologies, in addition to surface mount MMIC devices available as die or packaged parts.

What is a low noise amplifier?

A low noise amplifier is an electronic RF amplifier, which is an active network. Its purpose is to increase the amplitude of weak RF signals, which assists processing as part of a receiver circuit. 

Typically located immediately after the antenna in a receiver circuit (although a duplexer or filter may precede it), the primary specification parameter of an LNA is its noise figure, which is a measure of how much the LNA degrades the signal-to-noise ratio of the received signal. Other key performance specifications of low noise amplifiers are linearity (either P1dB or third order intercept), maximum input power, and DC power dissipation may be a consideration in battery powered equipment.  

Low noise amplifiers can also be used to compensate introduced loss in an RF signal path. By inserting a low noise amplifier, it will help to restore the original signal level, while ensuring the signal-to-noise ratio is retained.

Features of LNAs

Typical applications include:

•    Commercial and Military comms
•    Radar
•    EW systems
•    GPS
•    Wi-Fi (wireless LAN)
•    Satellite receiver

Want to find out more about our low noise amplifiers? Send us an enquiry now, or request more information from our easy-to-fill form.


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Castle Microwave is a Connexion Technologies Company.