Patent ID: 9680674
Date: 2017-06-13
CPC Classifications: H04B,H04L

Claim:
1. A receiver comprising: an analog front end configured to generate a baseband signal from a received radio frequency signal; an analog-to-digital converter configured to convert the baseband signal to a digital baseband signal; a calibration block configured to compensate for I/Q mismatches in a first portion of the digital baseband signal that is substantially frequency independent, the calibration block comprising a phase error estimator block configured to detect a phase difference between I/Q signals to correct the Q signal and an amplitude error estimator block configured to detect an amplitude difference between the I/Q signals to correct the I signal; and a correlator/integrator responsive to a feedback signal generated by the calibration block, said correlator/integrator configured to compensate for I/Q mismatches in a second portion of the digital baseband signal that is frequency dependent, the feedback signal being representative of the first portion of the digital baseband whose substantially frequency independent I/Q mismatches are compensated, wherein the calibration block further comprises a low-pass filter coupled to the phase error estimator block and the amplitude error estimator block and configured to pass the first portion and stop the second portion of the digital baseband signal.