Patent ID: 7855610
Filing Date: 2010-12-21
Classification: H03L

Abstract:
1. A method for adjusting the output frequency of a voltage-controlled oscillator (VCO), the VCO comprising a capacitor bank, the capacitor bank comprising a plurality of nominal selectable capacitances, the method comprising: during a calibration phase, providing at least one nominal frequency control signal to the capacitor bank in the VCO, and determining a trim setting control signal for the capacitor bank corresponding to said at least one nominal frequency control signal, wherein determining a trim setting control signal for the capacitor bank comprises: measuring a first output frequency of the VCO corresponding to a first trim setting control signal; measuring a second output frequency of the VCO corresponding to a second trim setting control signal; selecting the trim setting control signal corresponding to a VCO output frequency being closer to the at least one nominal frequency control signal; and during an operation phase, applying the at least one nominal frequency control signal to said capacitor bank in the VCO in conjunction with the corresponding trim setting control signal determined during said calibration phase.