A low noise amplifier is generally used as a high-frequency or intermediate-frequency preamplifier for various types of radio receivers, as well as amplifying circuits for high-sensitivity electronic detection equipment. When amplifying weak signals, the noise generated by the amplifier might substantially interfere with the signal. Therefore, it is hoped to reduce this noise to improve the signal-to-noise ratio of the output. The degradation of the signal-to-noise ratio caused by the amplifier is usually expressed by the noise figure F.
Low-noise amplifiers are an important component of the receiver circuit, which processes and converts the received signal into information. LNAs are meant to be close to the receiving device in order to reduce interference loss. They contribute only a small amount of noise (useless data) to the received signal since any more will severely degrade the already weakened signal. An LNA is employed when the signal-to-noise ratio (SNR) is high and needs to be reduced by roughly 50% while power is increased. The first component of a receiver to intercept a signal is the LNA, making it a critical component in the communications process.
Applications of the low-noise amplifier
LNA has experienced the early development of liquid helium-cooled parametric amplifiers and room temperature parametric amplifiers. With the rapid development of technology, it has been replaced by microwave field-effect transistor amplifiers in recent years. This type of amplifier has excellent characteristics of small size, low cost, and lightweight. Especially in terms of radio frequency characteristics, it has the characteristics of low noise, wide frequency band, and high gain. It has been widely used in C, Ku, Kv, and other frequency bands. And the noise temperature of commonly used low-noise amplifiers can be lower than 45K.
The low noise amplifier (LNA) is mainly designed for mobile communication infrastructure base station applications, such as transceiver wireless communication cards, tower-mounted amplifiers (TMA), combiners, repeaters, and remote/digital wireless broadband head-end equipment. Low noise figure (NF, Noise Figure) has set a new standard. At present, the wireless communication infrastructure industry is facing the challenge of providing the best signal quality and coverage in the crowded spectrum. Receiver sensitivity is one of the most critical requirements in the design of the base station receiving path. The appropriate LNA selection, especially the first Level LNA can greatly improve the sensitivity performance of base station receivers, and low noise index is also a key design goal.
If you have any needs of LNA, welcome to enquiry: sales@cdjx-mw.com.
Post time: Jun-13-2023
