High Margin Three-Junction Josephson Buffer With Isolation Function
Original Publication Date: 1984-Sep-01
Included in the Prior Art Database: 2005-Feb-05
Adding a junction to a three-junction buffer adds isolation and results in high margins. Such a Josephson buffer may find use as a DCL Z-OR or in a receiver that returns a minimal disturb signal back to the driver. Fig. 1 shows a magnetically coupled three-junction buffer with isolation junction 1. (The threshold curve for the device in Fig. 1 is about halfway between a directly coupled three-junction buffer and a magnetically coupled three-junction buffer without isolation.) Other junctions can be used to replace inductors in the three-junction buffer. Fig. 2 shows threshold curves for a standard two-junction buffer 2B, for a standard three-junction buffer 3B, and for the magnetically coupled three-junction buffer M3B. High floors are indicated by lines 4. The margins of the three-junction buffer are significantly improved.