AI 中文总结
介绍用于干涉测量射电望远镜的低成本、超宽带差分低噪声放大器，无需前置放大平衡-不平衡变换器，由商用元件构成，成本约20美元/单位，经多种测试表征，展示了良好噪声性能。
AI 中文摘要
我们展示了一种低成本、超宽带、双极化差分低噪声放大器，它无需前置放大平衡-不平衡变换器。该设计完全由商用表面贴装元件构成，每单位成本约20美元。通过实验室增益和噪声测量以及在多米尼克射电天体物理观测台的馈电耦合热-冷测试对放大器进行了表征。当与恒定130Ω源匹配时，在10:1带宽上展示了接近0.3dB的噪声系数，而当与在300 - 1500MHz带宽上工作的维瓦尔第馈电匹配时，馈电耦合测量产生低至25K的系统噪声温度。
英文摘要
We present a low-cost, ultra-wideband, dual-polarized differential low-noise amplifier that eliminates the need for a pre-amplification balun. Built entirely from commercial surface-mount components, the design costs approximately 20 US dollars per unit. The amplifier has been characterized through laboratory gain and noise measurements together with feed-coupled hot-cold testing at the Dominion Radio Astrophysical Observatory. A noise figure close to 0.3 dB is demonstrated across a 10:1 bandwidth when matched to a constant 130 $Ω$ source, while feed-coupled measurements yield system noise temperatures as low as 25 K when matched to a Vivaldi feed operating over a 300-1500 MHz bandwidth.
CommentsPresented at SPIE Astronomical Telescopes and Instrumentation 2026; To appear in SPIE Proceedings
