Abstract
A direct digital synthesizer (DDS) with 6-bit amplitude and 8-bit phase resolution is presented. The phase-to-amplitude mapping circuit is implemented as a differential pair in saturation. The suitability of this circuit for broadband application and high temperature range is shown. The use of a modern SiGe bipolar technology enables both a low power consumption of 366mW and a high clock frequency of 15GHz. A spurious free dynamic range (SFDR) between 42 and 20 dBc is achieved. The chip is fabricated in a 0.35 µm 200-GHz f T SiGe bipolar technology and occupies only 1024×1128 µm2.
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