Patent ID: 9054716
Filing Date: 2015-06-09
Classification: H03B,H03L,H04L

Abstract:
1. A frequency synthesizer comprising: a plurality of voltage-controlled oscillators (VCOs) of which a selected VCO provides a VCO output to a closed loop of a phase-locked loop; a charge pump configured to adjust a loop gain of the phase-locked loop based on a charge pump current control value; and a charge pump controller configured to select a VCO gain adjustment model corresponding to the selected VCO based on a VCO gain indicator, the VCO gain adjustment model representing a segment of a piecewise linear representation of a VCO correction curve associated with the selected VCO, the charge pump controller further configured to obtain, from a memory, VCO gain model parameters corresponding to the selected VCO gain adjustment model and to adjust the charge pump current control value based on the VCO gain model parameters to thereby cause the loop gain of the phase-locked loop to be adjusted.