Noise equivalent temperature difference of a superconducting integrated terahertz receiver
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The dependence of the noise equivalent temperature difference (NETD) of a superconducting integrated receiver (SIR) on the receiver noise temperature and the inputsignal level has been investigated. An unprecedented NETD of 13±2 mK has been measured at a SIR noise temperature of 200 K, intermediate-frequency bandwidth of 4 GHz, and time constant of 1 s. With a decrease in the input signal, an improvement in the NETD is observed. This effect is explained by a reduction in the influence of the instabilities of the receiver power supply and the amplification circuit that occur when the input signal is decreased.
PACS numbers74.40.+k 85.25.-j
- 3.V. P. Koshelets, L. V. Filippenko, V. B. Borisov, et al., Izv. Vyssh. Uchebn. Zaved., Radiofiz. 50, 935 (2007).Google Scholar
- 8.N. A. Esepkina, D. V. Korol’kov, and Yu. N. Pariiskii, Radiotelescopes and Radiometers (Nauka, Moscow, 1973) [in Russian].Google Scholar
- 9.R. V. Ozhegov, P. V. Gronskii, and T. V. Muratova, Prib. Tekh. Eksp., No. 3, 177 (2008).Google Scholar