ISSTT Proceedings

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Stability Measurements of a NbN HE13 Receiver at THz Frequencies

Authors:
T. Berg, S. Cherednichenko, V. Drakinskiy, H. Merkel, E. Kollberg, J.W. Kooi
Abstract:
To improve the signal to noise ratio, the operation of a receiver for radio astronomy applications requires an integration of the received signal over a certain time. When the integration time is too short, the effective observation time suffers from unavoidable black-out periods. Simultaneously an increase of the integration time is limited by the system stability, which consists of the stability of the mixer itself, the local oscillator (LO), the bias network and the read-out electronics. Using three LO-sources: a far infrared laser (FIR), a backward wave oscillator (BWO) and a multiplication chain, we have measured noise and gain stability of NbN hot electron bolometer (HEB) mixers of different sizes. As a stability measure we used the Allan variance time. We found that small HEB mixers are more unstable due to stronger noise-to-LO power dependence. For each HEB mixer size, we present data over stability and receiver noise temperature and discuss the trade off between system stability and noise.
Categories:
HEB Mixers
Year:
2004
Session:
1
Full-text:
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Page Number(s):
25-32