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Tiny antenna-sharing IC enables sleeker designs, fast GPS

18 Apr 2012

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STMicroelectronics has revealed a highly miniaturized IC for 4G smartphones, which offer high GPS performance. The 4G smartphones use multiple cellular connections to deliver mobile broadband services at speeds of more than 100Mbps. With Bluetooth, Wi-Fi and GPS also built in, some of the handset's receivers must share an antenna to save space. ST has used its advanced packaging expertise to create a tiny 1.14mm2 antenna-sharing IC, the DIP1524, capable of delivering high signal strength to several RF receivers simultaneously.

Users of smartphones featuring the DIP1524 will experience advantages including faster GPS startup time (time to first fix), more accurate position detection and. The DIP1524 diplexer utilizes ST's Integrated Passive Device (IPD) technology, fabricated on a glass substrate that minimizes insertion losses. Its flip-chip package has a footprint the same size as the chip itself, thereby occupying 65 percent less pc-board area than competing devices in conventional packages with a total footprint larger than 3mm2. The DIP1524 enables handset designers to connect receivers for GPS/GLONASS satellites, Bluetooth, Wi-Fi and LTE band 7 to the same antenna.

Key features of the DIP1524:
?GPS insertion loss: 0.65dB (max.)

?GLONASS insertion loss: 0.75dB (max.)

?Zero performance drift

?High channel isolation

?No value dispersion between components

The DIP1524-01D3 is now sampling in a 4-bump flip-chip package, and will be available in high volumes priced from $0.129 for orders over 1,000 pieces. Alternative higher-volume pricing options are available on request.

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