A 3.2 to 4 GHz, 0.25 /spl mu/m CMOS frequency synthesizer for IEEE 802.11a/b/g WLAN

A fully integrated 3.2 to 4 GHz frequency synthesizer, part of an IEEE 802.11a/b/g transceiver, is implemented in a 0.25 /spl mu/m standard CMOS technology. The phase noise is -105 dBc/Hz at 10 kHz offset, and the spurs are below -64 dBc when measured at the 5 GHz transmitter output. The settling time is less than 150 /spl mu/s.