A NRZ-output amplifier for RSFQ circuits

Abstract

Interfaces between RSFQ circuits in the Returnto-Zero (RZ) and semiconductor circuits in the Non-Return-toZero (NRZ) mode are developed for data transmission at about 10 GHz clock frequencies reducing the errors owing to a finite sampling jitter of conventional room temperature equipment. A prototype of a NFU output interface with the Nb-AI203-Nb technology has been simulated, implemented and successfully tested until now at 100 MHz. The interface can easily be combined with a superconducting pulse amplifier for NFU output signals in the range of several mV. Corresponding simulations and a layout of the amplifier are presented.

SCENET roadmap for superconductor digital electronics

“…RSFQ-converters from RZ-to NRZ with the Nb/A1 2 O 3 -Al/Nb technology have already been implemented at the University of Karlsruhe as shown in Fig. 23 [13].…”

RSFQ Technology: Circuits and Systems

“…104 The design consists of amplifiers, followed by a discriminator circuit and level shifters (DC restore) to provide standard ECL data waveforms. Whereas previous boards utilized differential outputs, the 1 GS/s modules operate with single-ended clock and data signals from the chip.…”