SUPERCON DUCTING MILLIMETER WAVE OSCILLATORS AND SIS MIXERS INTEGRATED ON A CHIP

All refractory material superconducting ed experimentally with different mixers integrated on the same chi. Tested structures include a Flux-Flow Oscillator (FFO) based on a Ion Josephson junction, a coupling section and a SIS dsector with tuned out junction capacitance. Coupling sections were designed as multistep microstrip quarter-wave im edance transformers. All junctions have been fabricateton the base of a high quality trilayer Nb-AlOx-Nb process. Microwave oscillations in the frequenc range 75-500 GHz have been detected experimentad. TEe level of delivered ower was estimated from the umped I-V curve (IVC) of the strong coupled singye junction detector. Coupled power levels hi her than 0.1 mu W at less than 1 MHz has been estimated experimentally. The first attem t to create an integrated receiver based on was made in the 2 mm wavelength band. A receiver noise temperature as low as 85 K at 150 GHz was demonstrated referred to the room temperature input horn.