Superconducting Tunnel Junctions As Mixers at 115 Ghz

Superconducting Tunnel Junctions As Mixers at 115 Ghz

Superconducting tunnel junctions have been used as the nonlinear element for mixing at a signal frequency of 115 GHz. The experimental results are compared with predictions of a theoretical analysis based on the quantum theory of mixing of J. R. Tucker. Qualitative agreement is obtained and suggesti...

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Veröffentlicht in:IEEE transactions on microwave theory and techniques 1981-02, Vol.29 (2), p.87-91
Hauptverfasser: Dolan, G.J., Linke, R.A., Sollner, T.C.L.G., Woody, D.P., Phillips, T.G.
Format: Artikel
Sprache:eng
Schlagworte:
Capacitance
Frequency
Josephson junctions
Local oscillators
Observatories
Quantum mechanics
Superconducting device noise
Temperature
Tunneling
Voltage
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Zusammenfassung:Superconducting tunnel junctions have been used as the nonlinear element for mixing at a signal frequency of 115 GHz. The experimental results are compared with predictions of a theoretical analysis based on the quantum theory of mixing of J. R. Tucker. Qualitative agreement is obtained and suggestions are made for quantitative reconciliation. The junctions were small area (/spl equiv/0.4mu m/sup 2/) with normal resistances of 60 to 100 omega and capacitance approximately 20 fF. Measured sensitivity (T/ sup SSB/sub MXR/=62 K, L/sub c/=7.6 dB) implies receiver noise temperatures superior to the best receivers now in use at this frequency.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.1981.1130300