Patent ID: 8060043

Claim:
A radio frequency transceiver, comprising: a duplexer; a transmitter coupled to the duplexer; a receiver including a mixer, coupled to the duplexer, wherein the receiver receives a leaked signal comprising a transmit RF signal leaked through the duplexer; and a calibration system, the calibration system including an estimator, coupled to the transmitter and to the receiver, for calculating an estimate of second-order intermodulation distortion in the receiver as a result of second-order intermodulation distortion occurring in the mixer, wherein the estimator uses a live transmit signal from the transmitter as reference signal, and a controller, coupled to the estimator, for adjusting an input-related, second-order intercept (IIP2) point tuning port of the mixer, based on the estimate of second-order intermodulation distortion in the receiver, to reduce second-order intermodulation distortion in the receiver.