Techniques are disclosed for compensating for second-order distortion in a
wireless communication device. In a zero-intermediate frequency (IF) or
low-IF architecture, IM2 distortion generated by the mixer (20) results
in undesirable distortion levels in the baseband output signal. A
compensation circuit (104) provides a measure of the IM2 distortion
current independent of the radio frequency (RF) pathway to generate an
IM2 calibration current. The IM2 calibration current is combined with the
baseband output signal to thereby eliminate the IM2 currents generated
within the RF pathway. In one embodiment, the calibration is provided at
the factory during final testing. In alternative embodiment, additional
circuitry (156, 158) may be added to the wireless communication device to
provide a pathway between the transmitter (150) and the receiver (146).
The transmitter signal is provided to the receiver to permit automatic
calibration of the unit. An internal signal source (162) may be used in
place of the transmitter (150). The auto-calibration may be performed to
eliminate IM2 distortion or permit optimization of the circuit to
minimize other forms of distortion or interference.