High Speed Direct Digital Synthesis for Next Generation RF Systems

Direct digital synthesizers ICs using 0.25 mum InP HBT technologies with clock rates promise to extend the range of such devices to clock rates in excess of 30 GHz. In this work, we report progress towards this goal with the fabrication circuits with improved clock speed at 25 GHz with an approximate clock frequency/power consumption figure-of-merit of 2.5 GHz/W