Patent ID: 7197091
Filing Date: 2007-03-27
Classification: H03D

Abstract:
1. A direct conversion receiver circuit comprising the following: a down-converting mixer that is configured to down-convert a received modulated signal to thereby generate a differential baseband signal; a low pass filter that is coupled to the down-converting mixer so as to filter high frequency components of the down-converted differential baseband signal to thereby generate a filtered differential down-converted signal; an up-converting mixer that is coupled to the low pass filter so as to receive and up-convert the filtered down-converted signal to generate a differential up-converted signal; a summer configured to receive and sum a signal that is at least derived from at least the filtered differential up-converted signal to thereby generate a summed signal; a compensating mixer configured to receive a signal that is at least derived from at least the summed signal, and configured to mix and down-convert the received signal to form a mixed differential signal; and an integrator configured to receive and integrate a differential signal that is at least derived from at least the mixed differential signal to generate an integrated differential signal that is at least indirectly applied back onto the differential output of the low pass filter.