Helios™ 3 EDGE RF Subsystem
Complete two-chip, Helios 3 Subsystem for quad-band (GSM850, EGSM900, DCS1800, PCS1900) cellular handsets.
Skyworks Helios 3 is the smallest and most efficient Polar Loop™ EDGE RF subsystem with a DigRF interface available on the market. The subsystem combines a highly integrated and fully programmable RF transceiver with a transmit/receive FEM that contains pHEMT switches, a PA, and an integrated coupler.
At the heart of the radio subsystem is Skyworks advanced Polar Loop™ transmit modulation architecture, which enables the radio to transmit both constant and non-constant envelope signals through the same transmit path to minimize the number of external components required to build a mobile handset. This significantly reduces the complexity, size, cost, and power requirements of next-generation EDGE platforms.
The Helios 3 EDGE RF Subsystem features:
- Direct connection to a single cell Lithium-ion battery with no required external regulation
- Closed Polar Loop transmit modulation architecture
- Compatibility with v1.12 of the DigRF standard
- PA saturation detection and prevention circuit
- Support for multi-slot GPRS and EDGE applications up to Class 34/39
- Simplified control interface with channel and PCL programming
The Helios 3 EDGE RF Subsystem consists of:
- SKY74218 RF Transceiver – Highly integrated, quad-band RF transceiver with DigRF interface.
- SKY77524 T/R Front-End Module – Quad-band Front-End Module with integrated coupler, pHEMT RF switch, and separate GSM850/EGSM900 and DCS1800/PCS1900 PA blocks provides a complete transmit path from transceiver output to antenna.