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We have fabricated and tested two-dimensional arrays of YBa2Cu3O7-δ superconducting quantum interference devices. The arrays contain over 36 000 nano Josephson junctions fabricated from ion irradiation of YBa2Cu3O7-δ through narrow slits in a resist-mask that was patterned with electron beam lithography and reactive ion etching. Measurements of current-biased arrays in magnetic field exhibit large voltage modulations as high as 30mV. [ABSTRACT FROM AUTHOR]

An open-stub compensation technique is proposed for passive equalisers used in high-speed digital communication systems. By simply lumping an open stub to the conventional RL-type passive equaliser, the frequency-dependent channel loss from the long transmission path can be compensated, the frequency response of the channel becomes more flat and the bandwidth is wider. On comparing the proposed passive equaliser with typical RL passive equalisers, the simulation results show that the proposed technique can achieve an improvement by 1 GHz in the flat region of S21 on a 60 cm-long differential pair. Thus, the proposed technique successfully demonstrates an improvement in electrical performance of about 57.4% in the time domain. [ABSTRACT FROM AUTHOR]

A new type of differential transmission line with a bend is proposed to reduce differential-to-common-mode conversion noise for high-speed digital circuits. The hybrid structure consists of alternating edge-coupled and broadside-coupled transmission line sections which has the effect of reducing the mode conversion noise by at least 20 dB up to 10 GHz, whereas the differential insertion loss remains low. In addition, in the time domain, the common-mode noise is lower than the conventional edge-coupled differential transmission line bend. The performance of the proposed structure with a bend is demonstrated both numerically and experimentally. The measurement results agree very well with the simulation results from the three-dimensional full-wave solver. [ABSTRACT FROM AUTHOR]