A novel, dual conversion architecture for the Digital Audio Broadcasting (DAB) dual band receiver is introduced. It avoids preselection filters and mini. mizes the number of PLLs by first converting both Lband and Band m inputs to a common 919 MHz intermediate frequency (IF) signal which is then downconverted to the 30 MHz ADC input A carefuily staged gain control strategy is used to meet the challenging sensitivity and intermodulation requirements.Introduction.
A low cost, 920 MHz to 30 MHz downconverter/AGC IF IC of novel topology is described. Implemented in Si bipolar technology, this device provides 85 dB of conversion gain, a 15 dB NF (including the 22dB loss of an external bandpass filter), a leveled output of 41 dBmV (120 mVrms), with a minimum IM ratio of 40 dB. With a companion RFIC , it forms a DAB receiver.
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