Suppress AM in GSM direct-conversion receivers

Direct-conversion receivers (Rxs) are highly integrated and capable of mult iband and multistandard operation. They also have the potential for low pow er consumption. So it is not surprising that the introduction of direct-con version Rx chip sets for the Global System for Mobile Communications (GSM) market(1) has sparked an immense interest in the GSM industry. But suppress ing the spurious detection of interfering amplitude-modulated (AM) signals is a major problem in direct-conversion Rx design.