Patent ID: 8150350

Claim:
A method of tuning a input-related, second-order intercept point (IIP2) of a mixer in a receiver of a transceiver including a transmitter, comprising the steps of: determining whether power output of the transmitter is greater than a predetermined power output level; determining whether a received signal strength indication of the receiver is less than a predetermined received signal strength indication level; providing values for a gain of an IIP2 estimator and an update rate of a IIP2 controller; using the gain of the IIP2 estimator, performing an optimization algorithm for estimating an estimated value of an IIP2 coefficient that is proportional to second-order intermodulation distortion occurring in the mixer; using the update rate of the IIP2 controller and the estimated value of the IIP2 coefficient, performing an optimization algorithm for changing a tuning voltage of the mixer; waiting a period for a change to occur in one or both of the power output level of the transmitter and a received signal strength indication of the receiver; after waiting the period, determining whether a change in one or both of the gain of the IIP2 estimator and the update rate of the IIP2 controller has occurred; based upon one of or both the change of the power output level and the received signal strength indication, determining whether a change in one or both of the gain of the IIP2 estimator and the update rate of the IIP2 controller are required; and if any such change is required, making a change in one or both of the gain of the IIP2 estimator and the update rate of the IIP2 controller, based upon information stored in a look-up table.