Low Noise RF Amplifier

Introduction

Low noise RF amplifier, an amplifier with a very low noise figure. It is generally used as a high-frequency or intermediate-frequency preamplifier for various radio receivers, and an amplifier circuit for high-sensitivity electronic detection equipment. In the case of amplifying weak signals, the noise of the amplifier itself may seriously interfere with the signal, so it is desirable to reduce this noise to improve the output signal-to-noise ratio.

Most modern low-noise amplifiers use transistors and field-effect transistors; GaAs field-effect transistor low-noise microwave amplifiers have been widely used, and their noise figure can be lower than 2 dB. The noise figure of the amplifier is also related to the working state of the transistor and the internal resistance of the signal source. To take into account the requirements of low noise and high gain, a low noise amplifier circuit with a common emitter and a common base is often used.

Effect

The function of the low noise RF amplifier is to amplify the weak radio frequency signal received by the antenna, reduce the introduction of noise as much as possible, and achieve the effect of a better signal, higher call quality, and higher data transmission rate on the mobile intelligent terminal.

Design requirements

RF LNA design requirements: as the first stage of the RF signal transmission link, the noise figure characteristics of the low noise amplifier (LNA) determine the noise performance of the front end of the entire RF circuit. Therefore, the design of the first stage LNA as a high-performance RF receiving circuit must meet the following requirements:

(1) high linearity to suppress interference and prevent sensitivity degradation;

(2) The gain is high enough to suppress the noise of subsequent stage modules;

(3) Matching with input and output impedance, usually 50 Ω;

(4) Low power consumption is required by the development trend of wireless communication equipment.

Features and Applications

The low noise RF amplifier is mainly used for the amplification of small and weak signals. It amplifies the small and weak signals received by the antenna from the air and reduces the noise disturbance, so as to provide the system with the needed information and data for demodulation.

The main requirements for LNA are:

1. Low noise coefficient (NF), that is, the noise power generated by LNA itself is low. Noise is the basic element to constrain small and weak signal detection, and any small and weak signal can be detected theoretically after amplification by LNA.

2. High gain, high gain with good flatness can not only usefully amplify the signal but also reduce the influence of lower level noise;

3. Large dynamic scale to give the input signal a variable scale without distortion;

4. It is well-matched with the signal source. The front end of the LNA is usually the RF passive filter. The transmission characteristics of this filter are sensitive to its load, so it needs excellent input-output reflection loss.

LNA is widely used in microwave communication, microwave measurement, radar, and other receiving systems. It is the first active circuit in the receiver circuit. The input end is connected to an RF filter, and the output end is connected to an image rejection filter or directly connected to a mixer. The main function is to amplify the microvolt-level voltage signal from the antenna.

Certificate

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Testing equipment

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Shipping

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