MUTUAL PHASE-LOCKING OF 10 YBA2CU3O7 STEP-EDGE JOSEPHSON-JUNCTIONS UPTO 45 K

We have developed a microwave circuit using ten parallel-biased high-t emperature superconductor Josephson junctions to demonstrate phase-loc king for applications such as oscillators, mixers, and detectors. The basic cell consists of two Josephson junctions enclosed in a microstri p resonator, which provides voltage-locking and low dynamic resistance in the current-voltage characteristic. Partial synchronization of the ten junctions was observed up to 45 K and up to 1 THz. The implicatio ns of this design for power and radiation Linewidth will be discussed. (C) 1996 American Institute of Physics.