Helios™ EDGE RF Subsystem
Complete
three-chip, Helios EDGE-based subsystem for quad-band (GSM850,
EGSM900, DCS1800, PCS1900) cellular handsets.
Skyworks Helios EDGE RF Subsystem combines a direct conversion transceiver, PA, and a PA controller/modulator into a three-chip radio solution that saves significant space, cost, and design cycle time while providing improved performance.
At the heart of the radio subsystem is Skyworks advanced Polar Loop™ transmit modulation architecture, which enables the radio to transmit both constant as well as 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 EDGE RF Subsystem features:
- Polar Loop transmit modulation architecture
- Integrated noise filtering; no pre-PA filters required
- Closed loop phase and amplitude modulation (GMSK,π/8 8-PSK) via control of non-linear GSM PA
- PA inside control loop provides excellent EVM and phase error performance with up to 6:1 VSWR without external isolator
- Transmitter with integrated VCOs
- Fully integrated fractional-N synthesizer and UHF VCO
- Impedance matching circuitry
The Helios EDGE RF Subsystem consists of:
- SKY77316 Power Amplifier – Incorporates separate GSM850/900 and DCS1800/PCS1900 PA control blocks, impedance matching circuitry for 50 Ohm input and output, and bias control.