Patent ID: 6393011
Filing Date: 2002-05-21
Classification: H04B

Abstract:
A receiving circuit of a mobile communication terminal, comprising:a front-end receiver for receiving a Code Division Multiple Access (CDMA) signal from an antenna and converting said CDMA signal into an intermediate frequency (IF) signal; a feed forward linearizer having: an intermodulation (IMD) product generator for generating, essentially, only an intermodulation product signal of an interference signal received by said antenna; a phase shifter for phase shifting of the intermodulation product signal generated from said intermodulation product generator; and a variable attenuator for adjusting magnitude of the intermodulation product signal; and a controller for controlling said phase shifter so that a phase difference between the intermodulation product signal generated from said intermodulation product generator and an intermodulation product signal generated from said front end receiver may be 180Â°, and controlling said variable attenuator so that these intermodulation product signals may have the same magnitude, so as to achieve cancellation of the intermodulation product signal contained within said IF signal.