Patent ID: 8396173
Filing Date: 2013-03-12
Classification: H04B,H04L

Abstract:
1. A receiver comprising: a local oscillator; a first frequency conversion module responsive to the local oscillator and a received signal to generate an in-phase I signal; a second frequency conversion module responsive to the local oscillator and the received signal to generate a quadrature Q signal; a first filter responsive to the first frequency conversion module and adapted to generate a first output signal having first and second portions of a frequency spectrum; a second filter responsive to the second frequency conversion module and adapted to generate a second output signal having the first and second portions of the frequency spectrum; a third filter responsive to the first filter; a fourth filter responsive to the second filter; a calibration block responsive to outputs of the third and fourth filters and adapted to detect mismatches associated with the first portion of the frequency spectrum; and a correlator/integrator responsive to the calibration block and adapted to generate a first feedback signal applied to the third filter and a second feedback signal applied to the fourth filter, said first and second feedback signals being operative to vary frequency characteristics of the third and fourth filters so as to compensate for mismatches associated with the second portion of the frequency spectrum in the first and second filters.