Il circuito integrato ibrido Silicon Labs si basa su un principio di conversione a bassa IF molto noto agli appassionati SDR. La ricezione si basa interamente su DSP dopo una conversione A/D dell'uscita del mixer.
The Si4736 receiver family reduces component count of existing solutions by more than 90 percent, providing the industry's smallest and first fully integrated AM/FM/WB radio in a tiny 3- x 3-mm package, enabling equipment makers to cost-effectively replace existing solutions as well as add WB functionality in a number of portable devices such as cell phones, navigation devices, and media and MP3 players for the first time.
The Si4736 family is the first to integrate AM/FM with weather band from antenna input to audio output into a single IC, including 1050 Hz alert tone detection, which enables the radio to automatically turn on the receiver to play incoming warning alerts. Silicon Labs' patented digital low-IF architecture enables industry-leading integration, offering feature and performance enhancements over traditional analog-based solutions. By applying this advanced and proven architecture, the Silicon Labs' AM/FM/WB solution provides better audio in strong signal environments and excellent sensitivity in weak signal environments. In addition, the Si4737 and Si4739 family members integrate FM RDS/RBDS decoding to provide station and song identification to listeners, further improving the consumer experience.