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Proceedings Paper

Third-order intermodulation distortion in high-temperature superconductor Josephson junction downconverter at 12 GHz
Author(s): Katsumi Suzuki; Kunihiko Hayashi; Manabu Fujimoto; Keiichi Yamaguchi; Shuichi Yoshikawa; Youichi Enomoto
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Paper Abstract

First we report on the microwave characteristics of the third order intermodulation distortion (IMD3) in a High-Tc Superconductor (HTS) Josephson Junction (JJ) Downconverter at 12 GHz. We have successfully developed high quality nonlinear YBCO microbridge Josephson junctions for such an active MMIC as a mixer with RF, LO, IF and bias filters, which have been fabricated on (100) MgO substrates with 20 mm X 20 mm X 0.5 mm dimensions. The minimum conversion loss of the JJ mixer is 11 dB at very small local microwave input power LO equals -20 dBm which is two order less than a Schottky diode mixer. Consequently, this small optimum LO power gives the small rf input power at which the output IF power of the YBCO mixer saturates. Two-tone third-order intercept point (IP3) performance is a significantly important figure of merit typically used to define linearity of devices and circuits. The rf input power equals -15 dBm at the IP3 point is obtained for the YBCO mixer at 15 K and LO equals 10.935 GHz with -22 dBm. We have successfully measured the dependence of IMD3 on temperature, bias current, and LO power.

Paper Details

Date Published: 4 January 1994
PDF: 9 pages
Proc. SPIE 2156, High Tc Microwave Superconductors and Applications, (4 January 1994); doi: 10.1117/12.166165
Show Author Affiliations
Katsumi Suzuki, ISTEC (Japan)
Kunihiko Hayashi, ISTEC (Japan)
Manabu Fujimoto, ISTEC (Japan)
Keiichi Yamaguchi, ISTEC (Japan)
Shuichi Yoshikawa, ISTEC (Japan)
Youichi Enomoto, ISTEC (Japan)

Published in SPIE Proceedings Vol. 2156:
High Tc Microwave Superconductors and Applications
Robert B. Hammond; Richard S. Withers, Editor(s)

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