Design of superconducting thin film microwave oscillators with weak variable thickness bridges

摘要

Oscillator designs based on superconducting variable-thickness bridge devices have been developed. Design considerations and constraints in the layout and fabrication of the circuits are discussed, and a test fixture suitable for circuit testing is described. Circuits fabricated with YBCO films were tested, but do not yet show the desired operating properties. Preliminary tests indicated poor film quality as the cause. Multiple oscillator designs operating at 40 GHz have been designed and simulated and are currently being tested using YBCO on LaAlO/sub 3/. Simulations were limited by the availability of specific simulation models for individual components.