A 1.7ghz 3V direct digital frequency synthesizer with an on-chip dac in 0.35μm SiGe BiCMOS

Abstract

A single-chip direct digital frequency synthesizer with hardware efficient phase-to-amplitude mapping and an integrated DAC achieves over 50dB SFDR in full-Nyquist band at 1.7GHz clock frequency for synthesized output signals up to 850MHz. The IC is implemented in a 0.35 /spl mu/m SiGe BiCMOS process and occupies an area of 4.8/spl times/5.0mm/sup 2/. Power efficiency is 1.76mW/MHz at 3V.