Low clock skew superconductor adiabatic quantum-flux-parametron logic circuits based on grid-distributed blocks

Author:

He YuxingORCID,Ayala Christopher L,Zeng Yu,Zou Xihua,Yan Lianshan,Pan Wei,Yoshikawa Nobuyuki

Abstract

Abstract Adiabatic quantum-flux-parametron (AQFP) is a promising superconductor logic family exhibiting extremely low switching energy. Traditional excitation of AQFP circuits depends on a pair of ac sources (i.e., four-phase clocking), whose currents are propagated throughout the chip to excite and clock each gate sequentially. This scheme, however, produces a considerably large clock skew due to the long propagation of the current pair and will heavily limit the scalability of an AQFP circuit. In this work, a global clocking scheme for low skew AQFP circuits is proposed based on microwave H-tree excitation networks and grid-distributed blocks. The H-tree network starts with a single transmission line (TL) but is exponentially split to several levels of TLs by using passive splitters, creating multiple leaves at the final level. A large-scale AQFP circuit can thus be distributed into several local blocks and clocked synchronously by the split currents from these leaves. Therefore, the accumulation of clock skew is limited to a small value only within each local block. For validation, a test circuit comprising four blocks with data interconnections between each other, and a 1-to-4 H-tree excitation network is demonstrated, where we obtain correct operation and wide excitation margins at gigahertz frequencies. The proposed clocking scheme is advantageous for the realization of very large-scale adiabatic superconductor logic circuits in the future.

Funder

National Natural Science Foundation of China

Japan Society for the Promotion of Science

Department of Science and Technology of Sichuan Province

Chengdu Science and Technology Bureau

Publisher

IOP Publishing

Subject

Materials Chemistry,Electrical and Electronic Engineering,Metals and Alloys,Condensed Matter Physics,Ceramics and Composites

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