ISSTT Proceedings

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Quantum Noise Contribution to the, Receiver Noise Temperature of HEB THz Heterodyne Receivers

Authors:
E. Kollberg, S. Yngvesson
Abstract:
In this paper we discuss the quantum limit of bolometric mixer receivers. The importance of the optics attenuation is emphasized. Based on a simple bolometer model we predict that the system and receiver quantum noise limits referred to the input of a double-sideband hot-electron bolometer mixer receiver are, respectively, 2(hfB) and 1(hfB). The quantum limit to the DSB receiver noise temperature is hf/2k, in agreement with what has previously often been assumed. We suggest that an image-rejection single-sideband version of the HEB mixer would have a system quantum noise limit of 1(hfB). We also suggest that at a frequency of several THz the quantum noise may indeed be responsible for about half the total receiver noise temperature in a typical HEB receiver system.
Categories:
Hot Electron Bolometers
Year:
2002
Session:
2
Full-text:
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Page Number(s):
73-84