A Cryogenic Integrated Noise Calibration and Coupler Module Using a MMIC LNA

Details A Cryogenic Integrated Noise Calibration and Coupler Module Using a MMIC LNA A Cryogenic Integrated Noise Calibration and Coupler Module Using a MMIC LNA

2011-06-06

arxiv.org/abs/1106.0944v1

IEEE Trans. Microwave Theory Tech., vol. 59, no. 8, pp. 2117-2122, Aug. 2011

Astronomy and Astrophysics

Astrophysics

Instrumentation and Methods for Astrophysics

Accepted May 03, 2011 for publication in IEEE Transactions on Microwave Theory and Techniques

Scientific paper

10.1109/TMTT.2011.2155668

A new cryogenic noise calibration source for radio astronomy receivers is presented. Dissipated power is only 4.2 mW, allowing it to be integrated with the cold part of the receiver. Measured long-term stability, sensitivity to bias voltages, and noise power output versus frequency are presented. The measured noise output versus frequency is compared to a warm noise diode injected into cryogenic K-band receiver and shows the integrated noise module to have less frequency structure, which will result in more accurate astronomical flux calibrations. It is currently in operation on the new 7-element K-band focal plane array receiver on the NRAO Robert C. Byrd Green Bank Telescope (GBT).

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