Presentation	2012-10-25 Design and operation of 6-bit variable SFQ pulse number multiplier Yoshitaka TAKAHASHI, Masataka MORIYA, Hiroshi SHIMADA, Yoshinao MIZUGAKI, Masaaki MAEZAWA,
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Abstract(in English)	Recently, a D/A converter based on frequency modulation (FM) of single flux quantum (SFQ) pulse trains has been proposed for application to a new generation of ac voltage standards. In this report, we present our new design of a variable pulse number multiplier (V-PNM) of counter-forwarding type, which is the core element of an FM-SFQ D/A converter. While the multiplication of our previous m-bit variable-PNM was limited only between 2^ and 2^m, the improved operation sequence in the new circuit makes the multiplication be extended from 1 to 2^m. Test circuits were fabricated using the ISTEC Nb STP2. Correct operations of a 6-bit variable-PNM with the multiplication from 1 to 64 are demonstrated with respect to the input signal of a Multiplication Controller (MC) that is integrated on the same chip and generates a sequence of codes for the multiplication.
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Keyword(in English)	Single Flux Quantum / superconducting integrated circuits / Josephson junction / D/A converter
Paper #	SCE2012-24
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Committee	SCE
Conference Date	2012/10/18(1days)
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Paper Information
Registration To	Superconductive Electronics (SCE)
Language	JPN
Title (in Japanese)	(See Japanese page)
Sub Title (in Japanese)	(See Japanese page)
Title (in English)	Design and operation of 6-bit variable SFQ pulse number multiplier
Sub Title (in English)
Keyword(1)	Single Flux Quantum
Keyword(2)	superconducting integrated circuits
Keyword(3)	Josephson junction
Keyword(4)	D/A converter
1st Author's Name	Yoshitaka TAKAHASHI
1st Author's Affiliation	The University of Electro-Communications()
2nd Author's Name	Masataka MORIYA
2nd Author's Affiliation	The University of Electro-Communications
3rd Author's Name	Hiroshi SHIMADA
3rd Author's Affiliation	The University of Electro-Communications
4th Author's Name	Yoshinao MIZUGAKI
4th Author's Affiliation	The University of Electro-Communications
5th Author's Name	Masaaki MAEZAWA
5th Author's Affiliation	National Institute of Advanced Industrial Science and Technology
Date	2012-10-25
Paper #	SCE2012-24
Volume (vol)	vol.112
Number (no)	262
Page	pp.pp.-
#Pages	6
Date of Issue