Table of Contents
International Journal of Microwave Science and Technology
Volume 2011, Article ID 387137, 11 pages
Research Article

Design and Realization of GaAs Digital Circuit for Mixed Signal MMIC Implementation in AESA Applications

1Dipartimento di Ingegneria Elettronica, Università degli Studi di Roma Tor Vergata, Via del Politecnico 1, 00133 Rome, Italy
2Selex Sistemi Integrati, Via Tiburtina 1231, 00131 Rome, Italy

Received 1 September 2011; Accepted 28 November 2011

Academic Editor: Mattia Borgarino

Copyright © 2011 Andrea Bentini et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A complete design flow starting from the technological process development up to the fabrication of digital circuits is presented. The aim of this work is to demonstrate the GaAs Enhancement/Depletion (E/D) double stop-etch technology implementation feasibility for digital applications, aimed at mixed signal circuit integration. On the basis of the characterization of small E/D devices with different Gate peripheries, developed by the SELEX-SI foundry, and the analysis of several GaAs-based logical families, the most suitable logic for the available technology has been selected. Then, simple test vehicles (level shifters, NOR logic gates and D Flip-Flops) have been designed, realized, and measured to validate the design strategy applied to the GaAs E/D process. These logical circuits are preliminary to the design of a more complex serial-to-parallel converter, to be implemented onto the same chip together with RF analog blocks, such as stepped attenuators and phase shifters.