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.

这些资金支持三年的努力，以开发低噪声低温晶体管放大器，用于用于毫米波长射电天文学。 晶体管放大器为射电天文系统提供了许多重要的优势，包括非常低（TN 65 K SSB）噪声，大（10-20 GHz）瞬时带宽，无输入过滤器的单侧带系统操作以及良好的稳定性。 对于焦平面阵列系统，还有一些特别重要的优点。 在工作温度和其他条件方面，这种系统相对非关键，并且它们适应了阵列所需的数量的繁殖。 最佳性能不需要机械调整。 在3毫米频段中，HEMT放大器性能的预测是接收器噪声温度低于65 K（单个边带），这在大多数频率下都应产生大气中的性能。 较大的带宽将有助于在较大的频率范围内以及来自具有未知速度的星系发射的多个光谱线。 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。 在两年内，应在3 mm波长范围内具有可比性能的设备。