All-digital phase-domain TX frequency synthesizer for Bluetooth radios in 0.13μm CMOS

Abstract

An all-digital frequency synthesizer for a single-chip Bluetooth radio is fabricated in 0.13/spl mu/m CMOS, and operates in a digitally-synchronous phase domain that naturally incorporates wideband GFSK modulation. The synthesizer includes a pulse-shaping TX filter and near class-E PA with digital amplitude control. Close-in phase noise is -86.2dBc/Hz, integrated rms phase noise is 0.9/spl deg/, and settling time is /spl les/ 50/spl mu/s.