A 16-GHz Bandwidth Cryogenic IF Amplifier With 4-K Noise Temperature for Sub-mm Radio-Astronomy Receivers

IF 3.9 2区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Terahertz Science and Technology Pub Date : 2024-02-27 DOI:10.1109/TTHZ.2024.3370893

Isaac López-Fernández;Juan Daniel Gallego-Puyol;Carmen Diez;Inmaculada Malo-Gomez;Ricardo Ignacio Amils;Ralf Flückiger;Diego Marti;Ronald Hesper

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Abstract

The major mm and sub-mm radio-astronomy observatories are prioritizing instantaneous bandwidth widening for their current or planned upgrades this decade. We present an ultra-wideband and ultra-low-noise cryogenic hybrid amplifier with 4 K ( NF = 0.06 dB) average noise temperature in the 2–18 GHz band when cooled to 6 K. It is based on a 100 nm gate pseudomorphic indium–phosphide HEMT with outstanding characteristics. This demonstration amplifier meets the noise and IF bandwidth demands of atacama large millimiter/submillimeter array (ALMA) next-generation receivers, doubling the present maximum IF instantaneous bandwidth with state-of-the-art noise performance, with a gain flatness of ±0.8 dB, and output return loss better than 15 dB over 85% of the band. It can be used in the 1–19 GHz range with negligible degradation, and a tentative test has been performed with a 602–720 GHz ALMA band-9 double sideband SIS mixer, showing a flat-average and low-ripple IF noise level in an 18-GHz wideband down to near dc. A balanced configuration is feasible to improve the input matching.

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用于亚毫米射电天文接收器的 16-GHz 带宽低温中频放大器，噪声温度为 4-K

主要的毫米和亚毫米射电天文台都在优先考虑瞬时带宽的拓宽，以便在本十年内进行或计划进行升级。我们展示了一款超宽带、超低噪声低温混合放大器，当冷却到 6 K 时，它在 2-18 GHz 频段的平均噪声温度为 4 K (NF = 0.06 dB)。该演示放大器可满足阿塔卡马大毫米/亚毫米波阵列（ALMA）下一代接收机对噪声和中频带宽的要求，将目前的最大中频瞬时带宽提高了一倍，并具有最先进的噪声性能，增益平坦度为 ±0.8 dB，在 85% 的频段内输出回损优于 15 dB。它可在 1-19 GHz 范围内使用，其性能降低可忽略不计，并与 602-720 GHz ALMA band-9 双边带 SIS 混频器一起进行了初步测试，结果表明，在 18 GHz 宽带内，中频噪声平均值平坦，波纹较低，接近直流。采用平衡配置来改善输入匹配是可行的。

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来源期刊

IEEE Transactions on Terahertz Science and Technology ENGINEERING, ELECTRICAL & ELECTRONIC-OPTICS

CiteScore

7.10

自引率

9.40%

发文量

102

期刊介绍： IEEE Transactions on Terahertz Science and Technology focuses on original research on Terahertz theory, techniques, and applications as they relate to components, devices, circuits, and systems involving the generation, transmission, and detection of Terahertz waves.