Abstract

This paper presents a 10GHz 8-bit Direct Digital Synthesizer (DDS) Microwave Monolithic Integrated Circuit (MMIC) implemented in 1µm GaAs HBT technology. The DDS takes a Double-Edge-Trigger (DET) 8-stage pipeline accumulator with sine-weighted DAC based ROM-less architecture, that can maximize the utilization ratio of GaAs HBT's high-speed potential. With an output frequency up to 5GHz, the DDS gives an average Spurious Free Dynamic Range (SFDR) of 23.24dBc through the first Nyquist band, and consumes 2.4W of DC power from a single −4.6V DC supply. Using 1651 GaAs HBT transistors, the total area of the DDS chip is 2.4×2.0mm2.

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