Development of Low Noise THz SIS Mixer Using an Array of Nb/Al-AlN/NbTiN Junctions

Karpov, A.; Miller, David; Stern, J. A.; Bumble, B.; Leduc, H. G.; Žmuidzinas, J.

doi:10.1109/tasc.2009.2017913

Cited by 4 publications

(2 citation statements)

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“…The main reason is that the operational frequency exceeds the gap frequency of niobium (∼ 700 GHz), which leads to the loss of the SIS mixers. Another suggested causality is shortage of local oscillator power [9]. Karpov et al [9] indicates that it is difficult to pump SIS mixers due to poor LO power around 1 THz, and then if SIS mixers are pumped enough, the increased LO power may improve the noise temperature.…”

Section: Introductionmentioning

confidence: 99%

“…Another suggested causality is shortage of local oscillator power [9]. Karpov et al [9] indicates that it is difficult to pump SIS mixers due to poor LO power around 1 THz, and then if SIS mixers are pumped enough, the increased LO power may improve the noise temperature. The recent active LO developments enable ∼ 1mW LO power generation around 1THz with a power combining method [10].…”

Section: Introductionmentioning

confidence: 99%

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Development of a 385–500 GHz Sideband-Separating Balanced SIS Mixer

Serizawa

Sekímoto

Kamikura

et al. 2012

J Infrared Milli Terahz Waves

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A submillimeter (385-500 GHz) low-noise sideband-separating balanced SIS (Superconductor Insulator Superconductor) mixer (Balanced 2SB mixer) with high IRR (Image Rejection Ratio) has been successfully developed, whose SSB (Single SideBand) noise temperature is ∼ 200 K (10hf/k) with an image rejection ratio of ≥∼10 dB. Balanced mixers have become a promising technology which would break through the limitation especially in terahertz receivers and heterodyne arrays. However, though there are examples in microwave with relatively worse noise performance, submillimeter and terahertz balanced mixers have rarely been developed in spite of their astronomical importance. The developed balanced 2SB mixer is not only the first one demonstrated at submillimeter frequency range, but also has very low noise, high IRR, wide detectable frequencies (385-500 GHz), and a flat IF output spectrum. The balanced 2SB mixer is composed of three RF hybrids, four DSB (Double SideBand) mixers, two 180 • IF hybrids, and an IF quadrature hybrid. Several important performance indicators such as noise temperature, IRR, required LO (Local Oscillator) power, and IF spectra were measured. The measured LO power required for the balanced 2SB mixer was typically ∼ 14 dB less than that of the single-ended mixers.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%