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本文以西德广播卫星为例,利用最新发展起来的场效应晶体管技术,设计了某些卫星上的关键部件,并讨论它们的特性。一、在卫星转发器上的应用 (1)低噪声输入放大器低噪声输入放大器与接收天线增益共同决定了转发器的输入灵敏度。在过去,是利用隧道二极管放大器或后接低噪声放大器的低损耗变频器来保证放大器的功能。而在后来的卫星中,随着参量放大器和场效应晶体管放大器(FETA)的问世,便扩大了低噪声放大器的“家族”。
In this paper, taking the West Germany broadcasting satellite as an example, we design the key components of some satellites and discuss their characteristics by using the newly developed field-effect transistor technology. A satellite transponder applications (1) low-noise input amplifier Low-noise input amplifier and receiving antenna gain together determine the transponder’s input sensitivity. In the past, the use of tunnel diode amplifiers or low-loss inverters followed by low-noise amplifiers ensured amplifier functionality. In subsequent satellites, the “family” of low-noise amplifiers was expanded with the advent of parametric and field-effect transistor amplifiers (FETAs).