In RF transceivers, a method and system for using phase shift key (PSK)
sync word for fine tuning frequency adjustment are provided. One aspect
of the invention provides for adjusting a local oscillator frequency in a
radio frequency (RF) receiver when a residual DC offset remains after a
coarse frequency offset adjustment if performed. The fine adjustment may
be necessary because of the synchronization required with a PSK-based
modulated portion of a Bluetooth packet. A residual phase shift detected
in a sync sequence portion of the Bluetooth packet may be utilized to
determine a residual or fine frequency adjustment. This approach may
allow an RF receiver to operate, in some instances, without the need for
an equalizer. In this regard, the power consumed by the RF receiver may
be minimized and/or the overall cost of the RF receiver may be reduced.