16-18 September 2019
Hotel Collegium Leoninum
Europe/Berlin timezone
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Contribution Oral presentation

Hotel Collegium Leoninum -
PAF frontend technology

Advanced Low Noise Ambient-Temperature Amplifiers


  • Dr. Sander WEINREB

Primary authors



LNAs operating at 25C have been developed with measured noise temperatures a factor of four lower than commercially available amplifiers in the 1.4 GHz frequency range. These new LNAs can have a transformational effect on radio astronomy arrays operating below 2 GHz by reducing the total system noise from 60K to <30K. In the past this noise level was only available with cryogenic cooling which limited the number of elements in phased array feeds as well as in spaced reflector arrays.

These room temperature LNAs have been highly developed with 6 revisions with 17 prototypes focused on manufacturability, reliability, and ease of use in a large system as well as low noise. Over 200 will be constructed in the next several months. The LNAs have measured noise temperature typically 10K at 25C in the 1.28 to 1.53 GHz range needed for an 110 x 5m array. In addition to low noise the LNAs have a built-in noise calibration source and one-wire operation with DC power, calibration control, and RF output all on a single output coaxial cable.

Measured data and photographs will be shown through a remote presentation.