Novel Tri-Stable RSFQ Elements

You can find the original text of the article Novel Tri-Stable Elements for Binary RSFQ Circuitry here. Yet, this document gives a good idea of what these crazy elements are and how to shadow their ternary nature so that they could be easily integrated with binary circuits without special interfaces.

This research is an RSFQ extension of the following work:
H. Chan, T. van Duzer, and D. Erne, "A tri-stable state Josephson device memory cell".

What Are Tri-Stable Elements?

Why Do We Need Them?

How Do They Look Like?

XCELL
This is an extended RSFQ eXclusive OR, or XOR, cell.

XOR
This is an RSFQ XOR cell without extensions.

NXOR
This is an inverted RSFQ XOR cell, or NXOR.

The horizontal size of the above images is about 200 um, with the least resolved feature of about 3 um. The chips were fabricated in HYPRES, Inc., using Niobium tri-layer low-Tc technology.

How Do We Test Them?

Contact: Dmitry Zinoviev