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This work presents a periodic arbitrary waveform generator based on a ring oscillator structure implemented in a 0.13 mum SiGe BiCMOS technology. Using 16 delay stages with control programmable weighted currents, the proposed waveform generator can output 3 GHz periodic waveforms. The total power consumption is less than 200 mW with a 2.2 V power supply. The total area of the SiGe chip is 1.0 mm2.