Patent ID: 8674771
Filing Date: 2014-03-18
Classification: H03L

Abstract:
1. A local oscillation generator for use in a transceiver, comprising: a phase locked loop operable to produce a radio frequency (RF) local oscillation signal, wherein the phase locked loop includes: a pre-calibration module operable to enable the RF local oscillation signal output by the VCO to lock on-to a desired new oscillation frequency; a VCO calibration module operable to program a gain of the VCO to an initial coarse VCO gain value based on the desired new oscillation frequency while the VCO locks-on to the desired new oscillation frequency, the initial coarse VCO gain value being selected from a plurality of predetermined coarse VCO gain values, each of the plurality of predetermined coarse VCO gain values representing one of a plurality of gain regions, each including a respective range of VCO gain values; and a gain calibration module operable to adjust the current pulse produced by the programmable charge pump to compensate for changes in the gain of the voltage controlled oscillator.