Development of MM-Wave Transistor Amplifiers for Focal Plane Arrays

焦平面阵列毫米波晶体管放大器的开发

• 批准号: 9217677
• 负责人: William Irvine
• 金额: $ 46.71万
• 依托单位: University of Massachusetts Amherst
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-02-15 至 1996-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9217677&HistoricalAwards=false
• 关键词: Development; MM; Wave; Transistor; Amplifiers

These funds support a three year effort to develop low-noise cryogenic transistor amplifiers for use in millimeter wavelength radio astronomy. Transistor amplifiers offer a number of significant advantages for radio astronomical systems, including very low (Tn 65 K SSB) noise, large (10 - 20 GHz) instantaneous bandwidth, single sideband system operation without input filters, and good stability. There are additional virtues of particular importance for focal plane array systems. Such systems are relatively non-critical in terms of operating temperature and other conditions and they are well-adapted to reproduction in the quantities required for arrays. No mechanical adjustments are required for optimum performance. Projections for the performance of HEMT amplifiers in the 3 mm band are receiver noise temperatures below 65 K (single sideband), which should yield atmospheric- limited performance at most frequencies. The large bandwidth will facilitate searches for multiple spectral lines over a large frequency range as well as for emission from galaxies having unknown velocities. Presently available devices offer extremely low noise performance in the 40 - 50 GHz range, which is where initial efforts will be directed. Within two years, devices with comparable performance in the 3 mm wavelength range should be obtainable.

这些资金支持一项为期三年的工作，开发用于毫米波射电天文学的低噪声低温晶体管放大器。晶体管放大器为射电天文系统提供了许多显著的优势，包括非常低（Tn 65k SSB）噪声，大（10 - 20 GHz）瞬时带宽，无需输入滤波器的单边带系统操作，以及良好的稳定性。焦平面阵列系统还有一些特别重要的优点。这种系统在操作温度和其他条件方面相对非关键，并且它们很好地适应阵列所需数量的再现。不需要机械调整以获得最佳性能。HEMT放大器在3mm波段的性能预测是接收器噪声温度低于65k（单边带），这应该在大多数频率下产生大气限制性能。大带宽将有助于搜索大频率范围内的多谱线，以及搜索速度未知的星系的发射。目前可用的设备在40 - 50 GHz范围内提供极低的噪声性能，这是最初的努力方向。在两年内，在3mm波长范围内具有类似性能的器件应该可以获得。