Fully Integrated Single-Chip Phone for the GSM ultra low cost handset market

The Si4901 single-chip phone, with industry leading RF performance, requires only 51 components for the complete modem electronic bill of materials (eBOM) for a mobile phone, seventy-five percent fewer than current low cost handsets.

The Si4901 is the second product in Silicon Laboratories’ AeroFONE single-chip phone family, delivering the highest level of integration in a voice-only, dual-band platform. Silicon Laboratories’ AeroFONE single-chip phones are the first and only solutions to fully integrate the power management unit (PMU), battery interface and charging circuitry, digital baseband, analog baseband and RF transceiver into a single monolithic CMOS IC.

The Si4901 is uniquely optimized for emerging markets where handset affordability drives subscriber growth, minimal handset features are required, performance is important, and quality and handset yield are critical. The Si4901 provides significantly lower total system cost through superior integration allowing for a 65 percent reduction in printed circuit board (PCB) area, as well as a 50 percent decrease in costs associated with manufacturing.

By simplifying PCB routing due to unparalleled integration including the PMU, the Si4901 is currently the only ULCH solution that enables the use of a 4-layer PCB for a complete handset design resulting in savings of as much as $1.00 over 6-layer designs. The combination of the AeroFONE software solution and 2 Mb of integrated SRAM eliminates the need for an expensive external SRAM. In addition, the Si4901 device takes full advantage of Silicon Laboratories’ patented digitally-controlled crystal oscillator (DCXO) technology to replace expensive external voltage-controlled temperature compensated crystal oscillator (VC-TCXO) modules with only a low-cost crystal resonator. A complete Si4901 AeroFONE-based design enables developers to build and manufacture handsets with a phone BOM under $16.

The Si4901 offers a flexible, scalable and easy-to-use development platform and is adaptable to multiple software protocol stacks, operating systems and applications frameworks. This unique approach lowers software-switching costs by enabling handset developers to either reuse existing software infrastructure or select one of the multiple protocol stacks and application software frameworks validated by Silicon Laboratories and its partners.