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4 January 1994 Third-order intermodulation distortion in high-temperature superconductor Josephson junction downconverter at 12 GHz
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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.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Katsumi Suzuki, Kunihiko Hayashi, Manabu Fujimoto, Keiichi Yamaguchi, Shuichi Yoshikawa, and Youichi Enomoto "Third-order intermodulation distortion in high-temperature superconductor Josephson junction downconverter at 12 GHz", Proc. SPIE 2156, High Tc Microwave Superconductors and Applications, (4 January 1994); https://doi.org/10.1117/12.166165
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