Architecture and Performance of an Alternative DAB Receiver Chip Set

A novel, dual conversion architecture for the Digital Audio Broadcasting (DAB) dual band receiver is introduced. It avoids preselection filters and minimizes the number of PLLs by first converting both L-band and Band III inputs to a common 919 MHz intermediate frequency (IF) signal which is then downconverted to the 30 MHz ADC input A carefully staged gain control strategy is used to meet the challenging sensitivity and intermodulation requirements.