Design and realization of a 13-bit serial to parallel GaAs digital circuit for 6–18 GHz T/R module

In this paper, a 13-bit serial to parallel GaAs digital circuit based on GaAs 0.15um Enhancement-Depletion(ED) PHEMT has been realized and measured. This serial to parallel circuit is designed for the 6-18 GHz T/R module, it controls 1-bit switch, 6-bit shifter and 6-bit attenuator. This GaAs logic circuit could reduce the size of T/R module chip and improve the integration degree of the system. The simulated and measured data on some basic logic cells (NOR logic gate, levelshifter) is shown in the paper. We also tested a 6-bit serial to parallel logic testcell. The 13-bit serial to parallel logic circuit work successfully in the whole T/R module.