Pulse Response of Mutually-Coupled dc-to-SFQ Converter Investigated using an On-Chip Pulse Generator

Tomoki WATANABE  Yoshiaki URAI  Hiroshi SHIMADA  Yoshinao MIZUGAKI  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E98-C   No.3   pp.238-241
Publication Date: 2015/03/01
Online ISSN: 1745-1353
Type of Manuscript: BRIEF PAPER
Category: 
Keyword: 
single-flux-quantum circuit,  Nb IC,  pulse generator,  pulse response,  

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Summary: 
A readout technique using single-flux-quantum (SFQ) circuits enables superconducting single photon detectors (SSPDs) to operate at further high-speed, where a mutually-coupled dc-to-SFQ (MC-dc/SFQ) converter is used as an interface between SSPDs and SFQ circuits. In this work, we investigated pulse response of the MC-dc/SFQ converter. We employed on-chip pulse generators to evaluate pulse response of the MC-dc/SFQ converter for various pulses. The MC-dc/SFQ converter correctly operated for the pulse current with the amplitude of 52 μA and the width of 179 ps. In addition, we examined influence of the pulse amplitude and width to operation of the MC-dc/SFQ converter by numerical simulation. The simulation results indicated that the MC-dc/SFQ converter had wide operation margins for pulse current with amplitudes of 30–60 μA irrespective of the pulse widths.