What Is RSFQ?

You may want to begin with an introductory write-up by Professor K. Likharev, one of the inventors of RSFQ, and then continue with a more detailed review. A complete collection of the pictures from both papers is also available via FTP (as PostScript pictures and Microsoft Word doc files). 

Brief history of RSFQ

• 1911 -- Kammerling Onnes discovers superconductivity 
• 1962 -- B. Josephson predicts the quantum effects that have his name 
• 1974 -- K. Likharev, article on "Properties of a superconducting ring closed with a weak link as a device with several stable states" (Radio Eng. and Electron. Phys. 19, No. 7, 109-115) 
• 1976 -- K. Nakajima, Y. Onodera, and Y. Ogawa, article on "Logic design of Josephson network" (J. Appl. Phys. 47, 1620-1627) 
• 1978 -- K. Nakajima and Y. Onodera, article on "Logic design of Josephson network - II" (J. Appl. Phys. 49, 2958-2963) 
• 1978 -- A. Silver proposes the first RSFQ circuit -- a T flip-flop 
• 1983 -- K. Nakajima, G. Oya, and Y. Sawada, article on "Fluxoid motion in phase mode Josephson switching system" (IEEE Trans. on Magn. 19, 1201-1204) 
• 1983 -- HYPRES founded 
• 1985 -- the first article on RSFQ