YBCO Josephson Junction Arrays
Abstract
Josephson junction arrays have long been suggested as efficient, tunable sources for upper microwave and mm-wave frequencies. Based on the fundamental properties of the junction and the ability to combine the power output of many junctions using an array, the circuit concept is quite promising. The challenge is to phase lock the junctions so that power adds coherently and a number of demonstrations with Nb junction arrays have been performed doing this. This program was intended to begin using YBCO junction arrays to demonstrate source potential at 77K. Edge junctions have been used in arrays with up to 60000 junctions and the ability to couple power off-chip has been demonstrated directly for frequencies of at least 70-160 GHz. Power outputs have approached 1 micro W (in relatively narrow bands) and tunability has exceeded 20 GHz. Some novel array architectures have been built, including one with improved linewidth per unit junction, and new techniques developed for extracting junction statistics from array spectra. These techniques are used as feedback for process optimizations now in progress.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 14, 1993
- Accession Number
- ADA277426
Entities
People
- Randy Simon