A fully integrated 1.175-to-2GHz frequency synthesizer with constant bandwidth for DVB-T applications

Abstract

A fully integrated 1.175 to 2 GHz differentially tuned frequency synthesizer aimed for DVB-T tuners is implemented in 0.18-mum CMOS. Techniques are proposed to make the loop bandwidth constant across the whole output frequency range to maintain phase noise optimization and loop stability. It exhibits in-band phase noise of -97.6 dBc/Hz at 10 kHz offset and integrated phase error of 0.63deg from 100 Hz to 10 MHz. The chip draws 10 mA from a 1.8 V supply while occupying 2.6 mm2 die area.