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关于微波低噪声放大器,本文以使晶体管放大器的低噪声化的设计方法为中心,介绍各种低功率放大器及功率放大器的现状。微波低噪声放大器的现状图1就目前的各种微波放大器表示了它们的噪声系数及频率特性。双极晶体管放大器、隧道二极管放大器和参量放大器等是过去人们已热知的低电平工作的低噪声放大器,近几年来晶体管的性能惊人地提高,已出现了在4千兆赫下噪声系数3分贝左
With respect to microwave low noise amplifiers, this article focuses on the design of low noise amplifier transistors and introduces the current status of various low power amplifiers and power amplifiers. Current Status of Microwave LNAs Figure 1 shows the noise figure and frequency characteristics of various current microwave amplifiers. Bipolar transistor amplifiers, tunnel diode amplifiers and parametric amplifiers are low-noise amplifiers that have been known for low levels of operation in the past. In recent years, the performance of transistors has been dramatically improved. The noise figure of 3 dB left