A NRZ-output amplifier for RSFQ circuits

Interfaces between RSFQ circuits in the Return-to-Zero (RZ) and semiconduct or circuits in the Non-Return-to-Zero (NRZ) mode are developed for data tra nsmission at about 10 GHz clock frequencies reducing the errors owing to a finite sampling jitter of conventional room temperature equipment. A protot ype of a NRZ output interface with the Nb-Al2O3-Nb technology has been simu lated, implemented and successfully tested until now at 100 MHz. The interf ace can easily be combined with a superconducting pulse amplifier for NRZ o utput signals in the range of several mV. Corresponding simulations and a l ayout of the amplifier are presented.