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1. (WO2017204977) RECIPROCAL QUANTUM LOGIC (RQL) SENSE AMPLIFIER

Pub. No.:    WO/2017/204977    International Application No.:    PCT/US2017/029632
Publication Date: Fri Dec 01 00:59:59 CET 2017 International Filing Date: Thu Apr 27 01:59:59 CEST 2017
IPC: G11C 7/06
G11C 7/10
G11C 11/44
G11C 11/16
Applicants: NORTHROP GRUMMAN SYSTEMS CORPORATION
Inventors: MILLER, Donald L.
HERR, Quentin P.
HERR, Anna Y.
Title: RECIPROCAL QUANTUM LOGIC (RQL) SENSE AMPLIFIER
Abstract:
One embodiment describes a reciprocal quantum logic (RQL) sense amplifier system. The system includes an input stage configured to amplify a sense current received at an input. The system also includes a detection stage configured to trigger at least one detection Josephson junction (JJ) in response to the amplified sense current and based on a clock signal to generate a single flux quantum (SFQ) pulse. The system further includes a Josephson transmission line (JTL) stage configured to propagate the SFQ pulse to an output of the RQL sense amplifier system based on at least one output JJ and to generate a negative SFQ pulse to reset the at least one detection JJ and the at least one output JJ based on the clock signal. The clock signal is a quadrature clock signal comprising an in-phase component and a quadrature-phase component; the detection stage comprises a first clock transformer configured to bias the at least one detection JJ based on the in-phase component, wherein the reset JTL comprises a second clock transformer configured to bias the at least one reset JJ based on the in-phase component, and wherein the output JTL comprises a third clock transformer configured to bias the at least one output JJ based on the quadrature-phase component.