Isochronous data link across a superconducting Nb flex cable with 5 femtojoules per bit*
Abstract
Interconnect properties position superconducting digital circuits to build large, high performance, power efficient digital systems. We report a board-to-board communication data link, which is a critical technological component that has not yet been addressed. Synchronous communication on chip and between chips mounted on a common board is enabled by the superconducting resonant clock/power network for Reciprocal Quantum Logic circuits. The data link is extended to board-to-board communication using isochronous communication, where there is a common frequency between boards but the relative phase is unknown. Our link uses over-sampling and configurable delay at the receiver to synchronize to the local clock phase. A single-bit isochronous data link has been demonstrated on-chip through a transmission line, and on a multi-chip module through a superconducting tape between driver and receiver with variable phase offset. Measured results demonstrated correct functionality with a clock margin of 3 dB at 3.6 GHz, and with 5 fJ bit−1at 4.2 K.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Mar 04, 2022
- Source ID
- 10.1088/1361-6668/ac5786
Entities
People
- Anna Herr
- Bhargav Yelamanchili
- Corey Kegerreis
- David Tuckerman
- Deepal Wehella Gamage
- Haitao Dai
- Jonathan Egan
- Max Nielsen
- Michael Hamilton
- Q.P. Herr
- Rabindra N Das
- Sherman E. Peek
- Yuan Chen
Organizations
- Army Research Office