DEVELOPMENT OF A RAPID-SINGLE-FLUX-QUANTUM SHIFT REGISTER FOR APPLICATIONS IN RF NOISE POWER METROLOGY

Shift registers operated in digital feedback mode and utilized as pseu do random noise generators are very attractive for application as nois e standards in rf noise power metrology, The paper reports on the conc ept of the integrated circuits required, based on superconducting Rapi d-Single-Flux-Quantum (RSFQ) logic, and realized in Nb/Al2O3-Al/Nb tec hnology, The design and layout of an 8-bit shift register is presented , Measurement results are reported which prove correct functionality f or clock frequencies up to 45 GHz for standard operation, Typical bias current margins for operation of the shift register are +/- 27%, Furt her narrow-band limited ranges of operation have been found up to 60 G Hz.