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在卫星直播电视接收系统中,不仅要求接收机具有较高的增益带宽积和一定的稳定性,更希望它有足够低的噪声,把天线接收下来的微弱信号,经低噪声放大器放大,再进行混频,不仅能降低系统噪声,提高载噪比,确保图象质量,而且能相应降低对混频器的技术要求.因此,宽带低噪声放大器是卫星直播电视机中
In the satellite live television receiving system, it not only requires the receiver to have high gain bandwidth product and certain stability, but also hopefully it has low enough noise. The weak signal received by the antenna is amplified by a low-noise amplifier and then carried out Mixing not only reduces system noise, improves carrier-to-noise ratio and ensures image quality, but also reduces the technical requirements for mixers accordingly, so broadband low-noise amplifiers are used in satellite live television sets