A low-noise amplifier (LNA) is an electronic component that amplifies a very low-power signal without significantly degrading its signal-to-noise ratio (SNR). Any electronic amplifier will increase the power of both the signal and the noise present at its input, but the amplifier will also introduce some additional noise.

2021年1月9日 · 低噪声放大器（Low-Noise Amplifier, LNA）是射频接收系统的核心器件，用于放大微弱信号并最小化噪声引入，其参数直接决定系统灵敏度、动态范围和信号质量。

LNA Metrics: Gain Defines small signal amplification capability of LNA For IC implementation, LNA input is interfaced off-chip and usually matched to specific impedance (50Ωor 75Ω). Its output is not necessary matched if directly drive the on-chip block such as mixer. This is characterized by voltage gain or transducer power gain by knowing the

2025年2月14日 · A Low Noise Amplifier (LNA) is an RF amplifier designed to boost very weak signals without significantly degrading the signal-to-noise ratio (SNR). These amplifiers operate in the front-end of communication receivers, positioned immediately after the antenna, to ensure that weak signals are strong enough for further amplification and processing.

2022年11月29日 · In this tutorial, we will learn the step-by-step guideline of a Low Noise Amplifier (LNA). For this tutorial, we will design an ISM band LNA for 2.4GHz to 2.5GHz applications. However, the technique presented here can be used to design LNA for any frequency band of interest. Eight steps are involved in designing an LNA, which is given in Table 1.1.

本文详细探讨了射频接收器(LNA)的关键性能参数，如噪声系数(NF)、增益(Gain)、稳定性以及输入匹配。 介绍了各种LNA拓扑，如CSwithinductivedegeneration、resistivefeedback、CG和CascodeCS，以及噪声消除LNA和改善线性度的方法。

1. Input-referred noise voltage and currents all noise sources in the amplifier (devices, resistors) are combined to form input-equivalent voltage and current sources at the input. We choose components and biasing in amp to minimize v n 2 and i n. Then select RS (or ZS) to provide the highest (S / N) OUT. This technique is good for encouraging ...

Low noise amplifier 是RX的第一级，负责接收微弱的RF RX信号（一般-60dbm，按照50ohm换算为Vpp大约0.63mV），放大20db左右送入mixer或者filter。 LNA的下列性能参数在设计和测试时，需要逐一考虑： NF= SNR_ {in}/SNR_ {out} 衡量LNA放大信号之后，额外引入的noise导致SNR变差的程度。 一般RX的NF是6~8db，天线大约0.5~1.5db，LNA大约2~3db，其他大 …

2024年8月8日 · Some practical considerations for LNA input and output matching: Use Smith Chart and S-parameters to visualize and optimize impedance matching; Design matching networks with sufficient bandwidth to cover desired frequency range; Realize matching networks with high-Q components to minimize losses

Architectural approaches include active and passive matching for the input and output 50 Ω match. Passive matching is based on an open loop LNA design, while active matching is based on feedback. Common emitter (source) or common base (gate) approaches are part of the consideration to meet the overall LNA specifications.