A New Drive Circuit Built in a Multichip Module for Supplying a Two-Phase Power to Josephson LSI Circuits

Takanori KUBO  Shigeo TANAHASHI  Kazuhiro KAWABATA  Ryoji JIKUHARA  Gentaro KAJI  Masami TERASAWA  Hiroshi NAKAGAWA  Masahiro AOYAGI  Youichi HAMAZAKI  Itaru KUROSAWA  Susumu TAKADA  

IEICE TRANSACTIONS on Electronics   Vol.E77-C   No.6   pp.970-974
Publication Date: 1994/06/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Superconductive Electronics
multilayer ceramic substrate,  multichip module,  Josephson LSI,  a quarter wavelength stripline,  

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A new built-in drive circuit for superconducting Josephson LSI circuits has been designed and fabricated in a ceramic multichip module. The drive circuit consists of an impedance matching circuit and a DC bias current feeding circuit to supply a two-phase power current to Josephson chips at a microwave frequency. The impedance matching circuit was designed based on a quarter wavelength stripline. A balanced stripline configuration was introduced to reduce the fluctuation of ground potential. Tungsten layers were used to make the drive circuit in a multilayer ceramic substrate of the multichip module. Whole circuit was successfully packed in a volume of 76 mm38 mm1.7 mm. The gain of microwave current were 20 dB around 1.2 GHz and 23 dB around 3.6 GHz, which were in good agreement with the simulated current gain.